Statistics filters

app/src/main/AndroidManifest.xml

@@ -239,6 +239,9 @@
 				<data android:scheme="kotatsu+kitsu" />
 			</intent-filter>
 		</activity>
+		<activity
+			android:name="org.koitharu.kotatsu.stats.ui.StatsActivity"
+			android:label="@string/reading_stats" />
 
 		<service
 			android:name="androidx.work.impl.foreground.SystemForegroundService"

app/src/main/kotlin/org/koitharu/kotatsu/core/backup/JsonDeserializer.kt

@@ -54,6 +54,7 @@ class JsonDeserializer(private val json: JSONObject) {
 		page = json.getInt("page"),
 		scroll = json.getDouble("scroll").toFloat(),
 		percent = json.getFloatOrDefault("percent", -1f),
+		chaptersCount = json.getIntOrDefault("chapters", -1),
 		deletedAt = 0L,
 	)
 

app/src/main/kotlin/org/koitharu/kotatsu/core/backup/JsonSerializer.kt

@@ -41,6 +41,7 @@ class JsonSerializer private constructor(private val json: JSONObject) {
 			put("page", e.page)
 			put("scroll", e.scroll)
 			put("percent", e.percent)
+			put("chapters", e.chaptersCount)
 		},
 	)
 

app/src/main/kotlin/org/koitharu/kotatsu/core/db/MangaDatabase.kt

@@ -30,6 +30,7 @@ import org.koitharu.kotatsu.core.db.migrations.Migration14To15
 import org.koitharu.kotatsu.core.db.migrations.Migration15To16
 import org.koitharu.kotatsu.core.db.migrations.Migration16To17
 import org.koitharu.kotatsu.core.db.migrations.Migration17To18
+import org.koitharu.kotatsu.core.db.migrations.Migration18To19
 import org.koitharu.kotatsu.core.db.migrations.Migration1To2
 import org.koitharu.kotatsu.core.db.migrations.Migration2To3
 import org.koitharu.kotatsu.core.db.migrations.Migration3To4
@@ -48,20 +49,22 @@ import org.koitharu.kotatsu.history.data.HistoryDao
 import org.koitharu.kotatsu.history.data.HistoryEntity
 import org.koitharu.kotatsu.scrobbling.common.data.ScrobblingDao
 import org.koitharu.kotatsu.scrobbling.common.data.ScrobblingEntity
+import org.koitharu.kotatsu.stats.data.StatsDao
+import org.koitharu.kotatsu.stats.data.StatsEntity
 import org.koitharu.kotatsu.suggestions.data.SuggestionDao
 import org.koitharu.kotatsu.suggestions.data.SuggestionEntity
 import org.koitharu.kotatsu.tracker.data.TrackEntity
 import org.koitharu.kotatsu.tracker.data.TrackLogEntity
 import org.koitharu.kotatsu.tracker.data.TracksDao
 
-const val DATABASE_VERSION = 18
+const val DATABASE_VERSION = 19
 
 @Database(
 	entities = [
 		MangaEntity::class, TagEntity::class, HistoryEntity::class, MangaTagsEntity::class,
 		FavouriteCategoryEntity::class, FavouriteEntity::class, MangaPrefsEntity::class,
 		TrackEntity::class, TrackLogEntity::class, SuggestionEntity::class, BookmarkEntity::class,
-		ScrobblingEntity::class, MangaSourceEntity::class,
+		ScrobblingEntity::class, MangaSourceEntity::class, StatsEntity::class,
 	],
 	version = DATABASE_VERSION,
 )
@@ -90,6 +93,8 @@ abstract class MangaDatabase : RoomDatabase() {
 	abstract fun getScrobblingDao(): ScrobblingDao
 
 	abstract fun getSourcesDao(): MangaSourcesDao
+
+	abstract fun getStatsDao(): StatsDao
 }
 
 fun getDatabaseMigrations(context: Context): Array<Migration> = arrayOf(
@@ -110,6 +115,7 @@ fun getDatabaseMigrations(context: Context): Array<Migration> = arrayOf(
 	Migration15To16(),
 	Migration16To17(context),
 	Migration17To18(),
+	Migration18To19(),
 )
 
 fun MangaDatabase(context: Context): MangaDatabase = Room

app/src/main/kotlin/org/koitharu/kotatsu/core/db/migrations/Migration18To19.kt

@@ -0,0 +1,12 @@
+package org.koitharu.kotatsu.core.db.migrations
+
+import androidx.room.migration.Migration
+import androidx.sqlite.db.SupportSQLiteDatabase
+
+class Migration18To19 : Migration(18, 19) {
+
+	override fun migrate(db: SupportSQLiteDatabase) {
+		db.execSQL("ALTER TABLE history ADD COLUMN `chapters` INTEGER NOT NULL DEFAULT -1")
+		db.execSQL("CREATE TABLE IF NOT EXISTS `stats` (`manga_id` INTEGER NOT NULL, `started_at` INTEGER NOT NULL, `duration` INTEGER NOT NULL, `pages` INTEGER NOT NULL, PRIMARY KEY(`manga_id`, `started_at`), FOREIGN KEY(`manga_id`) REFERENCES `history`(`manga_id`) ON UPDATE NO ACTION ON DELETE CASCADE )")
+	}
+}

app/src/main/kotlin/org/koitharu/kotatsu/core/prefs/AppSettings.kt

@@ -27,6 +27,7 @@ import org.koitharu.kotatsu.explore.data.SourcesSortOrder
 import org.koitharu.kotatsu.list.domain.ListSortOrder
 import org.koitharu.kotatsu.parsers.model.SortOrder
 import org.koitharu.kotatsu.parsers.util.find
+import org.koitharu.kotatsu.parsers.util.isNumeric
 import org.koitharu.kotatsu.parsers.util.mapNotNullToSet
 import org.koitharu.kotatsu.parsers.util.mapToSet
 import org.koitharu.kotatsu.reader.domain.ReaderColorFilter
@@ -191,11 +192,13 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 	var appPassword: String?
 		get() = prefs.getString(KEY_APP_PASSWORD, null)
 		set(value) = prefs.edit {
-			if (value != null) putString(KEY_APP_PASSWORD, value) else remove(
-				KEY_APP_PASSWORD,
-			)
+			if (value != null) putString(KEY_APP_PASSWORD, value) else remove(KEY_APP_PASSWORD)
 		}
 
+	var isAppPasswordNumeric: Boolean
+		get() = prefs.getBoolean(KEY_APP_PASSWORD_NUMERIC, false)
+		set(value) = prefs.edit { putBoolean(KEY_APP_PASSWORD_NUMERIC, value) }
+
 	val isLoggingEnabled: Boolean
 		get() = prefs.getBoolean(KEY_LOGGING_ENABLED, false)
 
@@ -419,6 +422,9 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 	val isPagesSavingAskEnabled: Boolean
 		get() = prefs.getBoolean(KEY_PAGES_SAVE_ASK, true)
 
+	val isStatsEnabled: Boolean
+		get() = prefs.getBoolean(KEY_STATS_ENABLED, false)
+
 	fun isTipEnabled(tip: String): Boolean {
 		return prefs.getStringSet(KEY_TIPS_CLOSED, emptySet())?.contains(tip) != true
 	}
@@ -528,6 +534,7 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 		const val KEY_READER_MODE = "reader_mode"
 		const val KEY_READER_MODE_DETECT = "reader_mode_detect"
 		const val KEY_APP_PASSWORD = "app_password"
+		const val KEY_APP_PASSWORD_NUMERIC = "app_password_num"
 		const val KEY_PROTECT_APP = "protect_app"
 		const val KEY_PROTECT_APP_BIOMETRIC = "protect_app_bio"
 		const val KEY_APP_VERSION = "app_version"
@@ -610,8 +617,7 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 		const val KEY_READING_TIME = "reading_time"
 		const val KEY_PAGES_SAVE_DIR = "pages_dir"
 		const val KEY_PAGES_SAVE_ASK = "pages_dir_ask"
-
-		// About
+		const val KEY_STATS_ENABLED = "stats_on"
 		const val KEY_APP_UPDATE = "app_update"
 		const val KEY_APP_TRANSLATION = "about_app_translation"
 	}

app/src/main/kotlin/org/koitharu/kotatsu/core/ui/BaseListAdapter.kt

@@ -29,8 +29,9 @@ open class BaseListAdapter<T : ListModel> : AsyncListDifferDelegationAdapter<T>(
 		return this
 	}
 
-	fun addListListener(listListener: ListListener<T>) {
+	fun addListListener(listListener: ListListener<T>): BaseListAdapter<T> {
 		differ.addListListener(listListener)
+		return this
 	}
 
 	fun removeListListener(listListener: ListListener<T>) {

app/src/main/kotlin/org/koitharu/kotatsu/core/ui/BaseViewModel.kt

@@ -68,6 +68,13 @@ abstract class BaseViewModel : ViewModel() {
 		errorEvent.call(error)
 	}
 
+	protected inline suspend fun <T> withLoading(block: () -> T): T = try {
+		loadingCounter.increment()
+		block()
+	} finally {
+		loadingCounter.decrement()
+	}
+
 	protected fun MutableStateFlow<Int>.increment() = update { it + 1 }
 
 	protected fun MutableStateFlow<Int>.decrement() = update { it - 1 }

app/src/main/kotlin/org/koitharu/kotatsu/core/ui/image/FaviconDrawable.kt

@@ -12,12 +12,10 @@ import android.graphics.RectF
 import android.graphics.drawable.Drawable
 import androidx.annotation.StyleRes
 import androidx.core.content.withStyledAttributes
-import androidx.core.graphics.ColorUtils
 import androidx.core.graphics.withClip
 import com.google.android.material.color.MaterialColors
 import org.koitharu.kotatsu.R
-import org.koitharu.kotatsu.core.util.Colors
-import kotlin.math.absoluteValue
+import org.koitharu.kotatsu.core.util.KotatsuColors
 
 class FaviconDrawable(
 	context: Context,
@@ -45,7 +43,7 @@ class FaviconDrawable(
 		}
 		paint.textAlign = Paint.Align.CENTER
 		paint.isFakeBoldText = true
-		colorForeground = MaterialColors.harmonize(Colors.random(name), colorBackground)
+		colorForeground = MaterialColors.harmonize(KotatsuColors.random(name), colorBackground)
 	}
 
 	override fun draw(canvas: Canvas) {

app/src/main/kotlin/org/koitharu/kotatsu/core/ui/widgets/ChipsView.kt

@@ -110,7 +110,7 @@ class ChipsView @JvmOverloads constructor(
 		chip.isChipIconVisible = false
 		chip.isCloseIconVisible = onChipCloseClickListener != null
 		chip.setOnCloseIconClickListener(chipOnCloseListener)
-		chip.setEnsureMinTouchTargetSize(false)
+		chip.setEnsureMinTouchTargetSize(false) // TODO remove
 		chip.setOnClickListener(chipOnClickListener)
 		addView(chip)
 		return chip

app/src/main/kotlin/org/koitharu/kotatsu/core/ui/widgets/PieChart.kt

@@ -1,397 +0,0 @@
-package org.koitharu.kotatsu.core.ui.widgets
-
-import android.animation.ValueAnimator
-import android.content.Context
-import android.graphics.Canvas
-import android.graphics.Color
-import android.graphics.CornerPathEffect
-import android.graphics.Paint
-import android.graphics.Rect
-import android.graphics.RectF
-import android.graphics.Typeface
-import android.os.Build
-import android.os.Parcelable
-import android.text.Layout
-import android.text.StaticLayout
-import android.text.TextDirectionHeuristic
-import android.text.TextDirectionHeuristics
-import android.text.TextPaint
-import android.util.AttributeSet
-import android.view.View
-import androidx.annotation.RequiresApi
-import androidx.interpolator.view.animation.FastOutSlowInInterpolator
-import org.koitharu.kotatsu.R
-import org.koitharu.kotatsu.core.util.ext.draw
-import org.koitharu.kotatsu.core.util.ext.getAnimationDuration
-import org.koitharu.kotatsu.core.util.ext.resolveDp
-import org.koitharu.kotatsu.core.util.ext.resolveSp
-
-class PieChart @JvmOverloads constructor(
-	context: Context,
-	attrs: AttributeSet? = null,
-	defStyleAttr: Int = 0
-) : View(context, attrs, defStyleAttr), PieChartInterface {
-
-	private var marginTextFirst: Float = context.resources.resolveDp(DEFAULT_MARGIN_TEXT_1)
-	private var marginTextSecond: Float = context.resources.resolveDp(DEFAULT_MARGIN_TEXT_2)
-	private var marginTextThird: Float = context.resources.resolveDp(DEFAULT_MARGIN_TEXT_3)
-	private var marginSmallCircle: Float = context.resources.resolveDp(DEFAULT_MARGIN_SMALL_CIRCLE)
-	private val marginText: Float = marginTextFirst + marginTextSecond
-	private val circleRect = RectF()
-	private var circleStrokeWidth: Float = context.resources.resolveDp(6f)
-	private var circleRadius: Float = 0f
-	private var circlePadding: Float = context.resources.resolveDp(8f)
-	private var circlePaintRoundSize: Boolean = true
-	private var circleSectionSpace: Float = 3f
-	private var circleCenterX: Float = 0f
-	private var circleCenterY: Float = 0f
-	private var numberTextPaint: TextPaint = TextPaint()
-	private var descriptionTextPain: TextPaint = TextPaint()
-	private var amountTextPaint: TextPaint = TextPaint()
-	private var textStartX: Float = 0f
-	private var textStartY: Float = 0f
-	private var textHeight: Int = 0
-	private var textCircleRadius: Float = context.resources.resolveDp(4f)
-	private var textAmountStr: String = ""
-	private var textAmountY: Float = 0f
-	private var textAmountXNumber: Float = 0f
-	private var textAmountXDescription: Float = 0f
-	private var textAmountYDescription: Float = 0f
-	private var totalAmount: Int = 0
-	private var pieChartColors: List<String> = listOf()
-	private var percentageCircleList: List<PieChartModel> = listOf()
-	private var textRowList: MutableList<StaticLayout> = mutableListOf()
-	private var dataList: List<Pair<Int, String>> = listOf()
-	private var animationSweepAngle: Int = 0
-
-	init {
-		var textAmountSize: Float = context.resources.resolveSp(22f)
-		var textNumberSize: Float = context.resources.resolveSp(20f)
-		var textDescriptionSize: Float = context.resources.resolveSp(14f)
-		var textAmountColor: Int = Color.WHITE
-		var textNumberColor: Int = Color.WHITE
-		var textDescriptionColor: Int = Color.GRAY
-
-		if (attrs != null) {
-			val typeArray = context.obtainStyledAttributes(attrs, R.styleable.PieChart)
-
-			val colorResId = typeArray.getResourceId(R.styleable.PieChart_pieChartColors, 0)
-			pieChartColors = typeArray.resources.getStringArray(colorResId).toList()
-
-			marginTextFirst = typeArray.getDimension(R.styleable.PieChart_pieChartMarginTextFirst, marginTextFirst)
-			marginTextSecond = typeArray.getDimension(R.styleable.PieChart_pieChartMarginTextSecond, marginTextSecond)
-			marginTextThird = typeArray.getDimension(R.styleable.PieChart_pieChartMarginTextThird, marginTextThird)
-			marginSmallCircle =
-				typeArray.getDimension(R.styleable.PieChart_pieChartMarginSmallCircle, marginSmallCircle)
-
-			circleStrokeWidth =
-				typeArray.getDimension(R.styleable.PieChart_pieChartCircleStrokeWidth, circleStrokeWidth)
-			circlePadding = typeArray.getDimension(R.styleable.PieChart_pieChartCirclePadding, circlePadding)
-			circlePaintRoundSize =
-				typeArray.getBoolean(R.styleable.PieChart_pieChartCirclePaintRoundSize, circlePaintRoundSize)
-			circleSectionSpace = typeArray.getFloat(R.styleable.PieChart_pieChartCircleSectionSpace, circleSectionSpace)
-
-			textCircleRadius = typeArray.getDimension(R.styleable.PieChart_pieChartTextCircleRadius, textCircleRadius)
-			textAmountSize = typeArray.getDimension(R.styleable.PieChart_pieChartTextAmountSize, textAmountSize)
-			textNumberSize = typeArray.getDimension(R.styleable.PieChart_pieChartTextNumberSize, textNumberSize)
-			textDescriptionSize =
-				typeArray.getDimension(R.styleable.PieChart_pieChartTextDescriptionSize, textDescriptionSize)
-			textAmountColor = typeArray.getColor(R.styleable.PieChart_pieChartTextAmountColor, textAmountColor)
-			textNumberColor = typeArray.getColor(R.styleable.PieChart_pieChartTextNumberColor, textNumberColor)
-			textDescriptionColor =
-				typeArray.getColor(R.styleable.PieChart_pieChartTextDescriptionColor, textDescriptionColor)
-			textAmountStr = typeArray.getString(R.styleable.PieChart_pieChartTextAmount) ?: ""
-
-			typeArray.recycle()
-		}
-
-		circlePadding += circleStrokeWidth
-
-		// Инициализация кистей View
-		initPaints(amountTextPaint, textAmountSize, textAmountColor)
-		initPaints(numberTextPaint, textNumberSize, textNumberColor)
-		initPaints(descriptionTextPain, textDescriptionSize, textDescriptionColor, true)
-	}
-
-	@RequiresApi(Build.VERSION_CODES.M)
-	override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
-		textRowList.clear()
-
-		val initSizeWidth = resolveDefaultSize(widthMeasureSpec, DEFAULT_VIEW_SIZE_WIDTH)
-
-		val textTextWidth = (initSizeWidth * TEXT_WIDTH_PERCENT)
-		val initSizeHeight = calculateViewHeight(heightMeasureSpec, textTextWidth.toInt())
-
-		textStartX = initSizeWidth - textTextWidth.toFloat()
-		textStartY = initSizeHeight.toFloat() / 2 - textHeight / 2
-
-		calculateCircleRadius(initSizeWidth, initSizeHeight)
-
-		setMeasuredDimension(initSizeWidth, initSizeHeight)
-	}
-
-	override fun onDraw(canvas: Canvas) {
-		super.onDraw(canvas)
-
-		drawCircle(canvas)
-		drawText(canvas)
-	}
-
-	override fun onRestoreInstanceState(state: Parcelable?) {
-		val pieChartState = state as? PieChartState
-		super.onRestoreInstanceState(pieChartState?.superState ?: state)
-
-		dataList = pieChartState?.dataList ?: listOf()
-	}
-
-	override fun onSaveInstanceState(): Parcelable {
-		val superState = super.onSaveInstanceState()
-		return PieChartState(superState, dataList)
-	}
-
-	override fun setDataChart(list: List<Pair<Int, String>>) {
-		dataList = list
-		calculatePercentageOfData()
-	}
-
-	override fun startAnimation() {
-		val animator = ValueAnimator.ofInt(0, 360).apply {
-			duration = context.getAnimationDuration(android.R.integer.config_longAnimTime)
-			interpolator = FastOutSlowInInterpolator()
-			addUpdateListener { valueAnimator ->
-				animationSweepAngle = valueAnimator.animatedValue as Int
-				invalidate()
-			}
-		}
-		animator.start()
-	}
-
-	private fun drawCircle(canvas: Canvas) {
-		for (percent in percentageCircleList) {
-			if (animationSweepAngle > percent.percentToStartAt + percent.percentOfCircle) {
-				canvas.drawArc(circleRect, percent.percentToStartAt, percent.percentOfCircle, false, percent.paint)
-			} else if (animationSweepAngle > percent.percentToStartAt) {
-				canvas.drawArc(
-					circleRect,
-					percent.percentToStartAt,
-					animationSweepAngle - percent.percentToStartAt,
-					false,
-					percent.paint,
-				)
-			}
-		}
-	}
-
-	private fun drawText(canvas: Canvas) {
-		var textBuffY = textStartY
-		textRowList.forEachIndexed { index, staticLayout ->
-			if (index % 2 == 0) {
-				staticLayout.draw(canvas, textStartX + marginSmallCircle + textCircleRadius, textBuffY)
-				canvas.drawCircle(
-					textStartX + marginSmallCircle / 2,
-					textBuffY + staticLayout.height / 2 + textCircleRadius / 2,
-					textCircleRadius,
-					Paint().apply { color = Color.parseColor(pieChartColors[(index / 2) % pieChartColors.size]) },
-				)
-				textBuffY += staticLayout.height + marginTextFirst
-			} else {
-				staticLayout.draw(canvas, textStartX, textBuffY)
-				textBuffY += staticLayout.height + marginTextSecond
-			}
-		}
-
-		canvas.drawText(totalAmount.toString(), textAmountXNumber, textAmountY, amountTextPaint)
-		canvas.drawText(textAmountStr, textAmountXDescription, textAmountYDescription, descriptionTextPain)
-	}
-
-	private fun initPaints(textPaint: TextPaint, textSize: Float, textColor: Int, isDescription: Boolean = false) {
-		textPaint.color = textColor
-		textPaint.textSize = textSize
-		textPaint.isAntiAlias = true
-
-		if (!isDescription) textPaint.typeface = Typeface.create(Typeface.DEFAULT, Typeface.BOLD)
-	}
-
-	private fun resolveDefaultSize(spec: Int, defValue: Int): Int {
-		return when (MeasureSpec.getMode(spec)) {
-			MeasureSpec.UNSPECIFIED -> resources.resolveDp(defValue)
-			else -> MeasureSpec.getSize(spec)
-		}
-	}
-
-	@RequiresApi(Build.VERSION_CODES.M)
-	private fun calculateViewHeight(heightMeasureSpec: Int, textWidth: Int): Int {
-		val initSizeHeight = resolveDefaultSize(heightMeasureSpec, DEFAULT_VIEW_SIZE_HEIGHT)
-		textHeight = (dataList.size * marginText + getTextViewHeight(textWidth)).toInt()
-
-		val textHeightWithPadding = textHeight + paddingTop + paddingBottom
-		return if (textHeightWithPadding > initSizeHeight) textHeightWithPadding else initSizeHeight
-	}
-
-	private fun calculateCircleRadius(width: Int, height: Int) {
-		val circleViewWidth = (width * CIRCLE_WIDTH_PERCENT)
-		circleRadius = if (circleViewWidth > height) {
-			(height.toFloat() - circlePadding) / 2
-		} else {
-			circleViewWidth.toFloat() / 2
-		}
-
-		with(circleRect) {
-			left = circlePadding
-			top = height / 2 - circleRadius
-			right = circleRadius * 2 + circlePadding
-			bottom = height / 2 + circleRadius
-		}
-
-		circleCenterX = (circleRadius * 2 + circlePadding + circlePadding) / 2
-		circleCenterY = (height / 2 + circleRadius + (height / 2 - circleRadius)) / 2
-
-		textAmountY = circleCenterY
-
-		val sizeTextAmountNumber = getWidthOfAmountText(
-			totalAmount.toString(),
-			amountTextPaint,
-		)
-
-		textAmountXNumber = circleCenterX - sizeTextAmountNumber.width() / 2
-		textAmountXDescription = circleCenterX - getWidthOfAmountText(textAmountStr, descriptionTextPain).width() / 2
-		textAmountYDescription = circleCenterY + sizeTextAmountNumber.height() + marginTextThird
-	}
-
-	@RequiresApi(Build.VERSION_CODES.M)
-	private fun getTextViewHeight(maxWidth: Int): Int {
-		var textHeight = 0
-		dataList.forEach {
-			val textLayoutNumber = getMultilineText(
-				text = it.first.toString(),
-				textPaint = numberTextPaint,
-				width = maxWidth,
-			)
-			val textLayoutDescription = getMultilineText(
-				text = it.second,
-				textPaint = descriptionTextPain,
-				width = maxWidth,
-			)
-			textRowList.apply {
-				add(textLayoutNumber)
-				add(textLayoutDescription)
-			}
-			textHeight += textLayoutNumber.height + textLayoutDescription.height
-		}
-
-		return textHeight
-	}
-
-	private fun calculatePercentageOfData() {
-		totalAmount = dataList.fold(0) { res, value -> res + value.first }
-
-		var startAt = circleSectionSpace
-		percentageCircleList = dataList.mapIndexed { index, pair ->
-			var percent = pair.first * 100 / totalAmount.toFloat() - circleSectionSpace
-			percent = if (percent < 0f) 0f else percent
-
-			val resultModel = PieChartModel(
-				percentOfCircle = percent,
-				percentToStartAt = startAt,
-				colorOfLine = Color.parseColor(pieChartColors[index % pieChartColors.size]),
-				stroke = circleStrokeWidth,
-				paintRound = circlePaintRoundSize,
-			)
-			if (percent != 0f) startAt += percent + circleSectionSpace
-			resultModel
-		}
-	}
-
-	private fun getWidthOfAmountText(text: String, textPaint: TextPaint): Rect {
-		val bounds = Rect()
-		textPaint.getTextBounds(text, 0, text.length, bounds)
-		return bounds
-	}
-
-	@RequiresApi(Build.VERSION_CODES.M)
-	private fun getMultilineText(
-		text: CharSequence,
-		textPaint: TextPaint,
-		width: Int,
-		start: Int = 0,
-		end: Int = text.length,
-		alignment: Layout.Alignment = Layout.Alignment.ALIGN_NORMAL,
-		textDir: TextDirectionHeuristic = TextDirectionHeuristics.LTR,
-		spacingMult: Float = 1f,
-		spacingAdd: Float = 0f
-	): StaticLayout {
-
-		return StaticLayout.Builder
-			.obtain(text, start, end, textPaint, width)
-			.setAlignment(alignment)
-			.setTextDirection(textDir)
-			.setLineSpacing(spacingAdd, spacingMult)
-			.build()
-	}
-
-	companion object {
-		private const val DEFAULT_MARGIN_TEXT_1 = 2f
-		private const val DEFAULT_MARGIN_TEXT_2 = 10f
-		private const val DEFAULT_MARGIN_TEXT_3 = 2f
-		private const val DEFAULT_MARGIN_SMALL_CIRCLE = 12f
-
-		private const val TEXT_WIDTH_PERCENT = 0.40
-		private const val CIRCLE_WIDTH_PERCENT = 0.50
-
-		const val DEFAULT_VIEW_SIZE_HEIGHT = 150
-		const val DEFAULT_VIEW_SIZE_WIDTH = 250
-	}
-}
-
-interface PieChartInterface {
-
-	fun setDataChart(list: List<Pair<Int, String>>)
-
-	fun startAnimation()
-}
-
-data class PieChartModel(
-	var percentOfCircle: Float = 0f,
-	var percentToStartAt: Float = 0f,
-	var colorOfLine: Int = 0,
-	var stroke: Float = 0f,
-	var paint: Paint = Paint(),
-	var paintRound: Boolean = true
-) {
-
-	init {
-		if (percentOfCircle < 0 || percentOfCircle > 100) {
-			percentOfCircle = 100f
-		}
-
-		percentOfCircle = 360 * percentOfCircle / 100
-
-		if (percentToStartAt < 0 || percentToStartAt > 100) {
-			percentToStartAt = 0f
-		}
-
-		percentToStartAt = 360 * percentToStartAt / 100
-
-		if (colorOfLine == 0) {
-			colorOfLine = Color.parseColor("#000000")
-		}
-
-		paint = Paint()
-		paint.color = colorOfLine
-		paint.isAntiAlias = true
-		paint.style = Paint.Style.STROKE
-		paint.strokeWidth = stroke
-		paint.isDither = true
-
-		if (paintRound) {
-			paint.strokeJoin = Paint.Join.ROUND
-			paint.strokeCap = Paint.Cap.ROUND
-			paint.pathEffect = CornerPathEffect(8f)
-		}
-	}
-}
-
-class PieChartState(
-	superSavedState: Parcelable?,
-	val dataList: List<Pair<Int, String>>
-) : View.BaseSavedState(superSavedState), Parcelable

app/src/main/kotlin/org/koitharu/kotatsu/core/util/KotatsuColors.kt

@@ -7,9 +7,10 @@ import androidx.core.graphics.ColorUtils
 import com.google.android.material.R
 import com.google.android.material.color.MaterialColors
 import org.koitharu.kotatsu.core.util.ext.getThemeColor
+import org.koitharu.kotatsu.parsers.model.Manga
 import kotlin.math.absoluteValue
 
-object Colors {
+object KotatsuColors {
 
 	@ColorInt
 	fun segmentColor(context: Context, @AttrRes resId: Int): Int {
@@ -20,11 +21,24 @@ object Colors {
 		return MaterialColors.harmonize(color, backgroundColor)
 	}
 
+	@ColorInt
 	fun random(seed: Any): Int {
 		val hue = (seed.hashCode() % 360).absoluteValue.toFloat()
 		return ColorUtils.HSLToColor(floatArrayOf(hue, 0.5f, 0.5f))
 	}
 
+	@ColorInt
+	fun ofManga(context: Context, manga: Manga?): Int {
+		val color = if (manga != null) {
+			val hue = (manga.id.absoluteValue % 360).toFloat()
+			ColorUtils.HSLToColor(floatArrayOf(hue, 0.5f, 0.5f))
+		} else {
+			context.getThemeColor(R.attr.colorSurface)
+		}
+		val backgroundColor = context.getThemeColor(R.attr.colorSurfaceContainerHigh)
+		return MaterialColors.harmonize(color, backgroundColor)
+	}
+
 	private fun getHue(hex: String): Float {
 		val r = (hex.substring(0, 2).toInt(16)).toFloat()
 		val g = (hex.substring(2, 4).toInt(16)).toFloat()

app/src/main/kotlin/org/koitharu/kotatsu/details/data/ReadingTime.kt

@@ -10,6 +10,7 @@ data class ReadingTime(
 ) {
 
 	fun format(resources: Resources): String = when {
+		hours == 0 && minutes == 0 -> resources.getString(R.string.less_than_minute)
 		hours == 0 -> resources.getQuantityString(R.plurals.minutes, minutes, minutes)
 		minutes == 0 -> resources.getQuantityString(R.plurals.hours, hours, hours)
 		else -> resources.getString(

app/src/main/kotlin/org/koitharu/kotatsu/details/domain/ReadingTimeUseCase.kt

@@ -5,25 +5,27 @@ import org.koitharu.kotatsu.core.model.findById
 import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.details.data.MangaDetails
 import org.koitharu.kotatsu.details.data.ReadingTime
+import org.koitharu.kotatsu.stats.data.StatsRepository
+import java.util.concurrent.TimeUnit
 import javax.inject.Inject
 import kotlin.math.roundToInt
 
 class ReadingTimeUseCase @Inject constructor(
 	private val settings: AppSettings,
+	private val statsRepository: StatsRepository,
 ) {
 
-	fun invoke(manga: MangaDetails?, branch: String?, history: MangaHistory?): ReadingTime? {
+	suspend fun invoke(manga: MangaDetails?, branch: String?, history: MangaHistory?): ReadingTime? {
 		if (!settings.isReadingTimeEstimationEnabled) {
 			return null
 		}
-		// FIXME MAXIMUM HARDCODE!!! To do calculation with user's page read speed and his favourites/history mangas average pages in chapter
 		val chapters = manga?.chapters?.get(branch)
 		if (chapters.isNullOrEmpty()) {
 			return null
 		}
 		val isOnHistoryBranch = history != null && chapters.findById(history.chapterId) != null
 		// Impossible task, I guess. Good luck on this.
-		var averageTimeSec: Int = 20 * 10 * chapters.size // 20 pages, 10 seconds per page
+		var averageTimeSec: Int = 20 /* pages */ * getSecondsPerPage(manga.id) * chapters.size
 		if (isOnHistoryBranch) {
 			averageTimeSec = (averageTimeSec * (1f - checkNotNull(history).percent)).roundToInt()
 		}
@@ -36,4 +38,16 @@ class ReadingTimeUseCase @Inject constructor(
 			isContinue = isOnHistoryBranch,
 		)
 	}
+
+	private suspend fun getSecondsPerPage(mangaId: Long): Int {
+		var time = if (settings.isStatsEnabled) {
+			TimeUnit.MILLISECONDS.toSeconds(statsRepository.getTimePerPage(mangaId)).toInt()
+		} else {
+			0
+		}
+		if (time == 0) {
+			time = 10 // default
+		}
+		return time
+	}
 }

app/src/main/kotlin/org/koitharu/kotatsu/details/ui/DetailsActivity.kt

@@ -138,7 +138,10 @@ class DetailsActivity :
 				},
 			),
 		)
-		viewModel.onActionDone.observeEvent(this, ReversibleActionObserver(viewBinding.containerDetails, viewBinding.layoutBottom))
+		viewModel.onActionDone.observeEvent(
+			this,
+			ReversibleActionObserver(viewBinding.containerDetails, viewBinding.layoutBottom),
+		)
 		viewModel.onShowTip.observeEvent(this) { showTip() }
 		viewModel.historyInfo.observe(this, ::onHistoryChanged)
 		viewModel.selectedBranch.observe(this) {
@@ -150,6 +153,7 @@ class DetailsActivity :
 		viewModel.isChaptersEmpty.observe(this, chaptersMenuInvalidator)
 		val menuInvalidator = MenuInvalidator(this)
 		viewModel.favouriteCategories.observe(this, menuInvalidator)
+		viewModel.isStatsEnabled.observe(this, menuInvalidator)
 		viewModel.remoteManga.observe(this, menuInvalidator)
 		viewModel.branches.observe(this) {
 			viewBinding.buttonDropdown.isVisible = it.size > 1

app/src/main/kotlin/org/koitharu/kotatsu/details/ui/DetailsMenuProvider.kt

@@ -23,6 +23,7 @@ import org.koitharu.kotatsu.favourites.ui.categories.select.FavoriteSheet
 import org.koitharu.kotatsu.parsers.model.MangaSource
 import org.koitharu.kotatsu.scrobbling.common.ui.selector.ScrobblingSelectorSheet
 import org.koitharu.kotatsu.search.ui.multi.MultiSearchActivity
+import org.koitharu.kotatsu.stats.ui.sheet.MangaStatsSheet
 
 class DetailsMenuProvider(
 	private val activity: FragmentActivity,
@@ -43,6 +44,7 @@ class DetailsMenuProvider(
 		menu.findItem(R.id.action_shortcut).isVisible = ShortcutManagerCompat.isRequestPinShortcutSupported(activity)
 		menu.findItem(R.id.action_scrobbling).isVisible = viewModel.isScrobblingAvailable
 		menu.findItem(R.id.action_online).isVisible = viewModel.remoteManga.value != null
+		menu.findItem(R.id.action_stats).isVisible = viewModel.isStatsEnabled.value
 		menu.findItem(R.id.action_favourite).setIcon(
 			if (viewModel.favouriteCategories.value) R.drawable.ic_heart else R.drawable.ic_heart_outline,
 		)
@@ -101,6 +103,12 @@ class DetailsMenuProvider(
 				}
 			}
 
+			R.id.action_stats -> {
+				viewModel.manga.value?.let {
+					MangaStatsSheet.show(activity.supportFragmentManager, it)
+				}
+			}
+
 			R.id.action_scrobbling -> {
 				viewModel.manga.value?.let {
 					ScrobblingSelectorSheet.show(activity.supportFragmentManager, it, null)

app/src/main/kotlin/org/koitharu/kotatsu/details/ui/DetailsViewModel.kt

@@ -100,6 +100,10 @@ class DetailsViewModel @Inject constructor(
 	val favouriteCategories = interactor.observeIsFavourite(mangaId)
 		.stateIn(viewModelScope + Dispatchers.Default, SharingStarted.Eagerly, false)
 
+	val isStatsEnabled = settings.observeAsStateFlow(viewModelScope + Dispatchers.Default, AppSettings.KEY_STATS_ENABLED) {
+		isStatsEnabled
+	}
+
 	val remoteManga = MutableStateFlow<Manga?>(null)
 
 	val newChaptersCount = details.flatMapLatest { d ->

app/src/main/kotlin/org/koitharu/kotatsu/history/data/HistoryEntity.kt

@@ -15,8 +15,8 @@ import org.koitharu.kotatsu.core.db.entity.MangaEntity
 			parentColumns = ["manga_id"],
 			childColumns = ["manga_id"],
 			onDelete = ForeignKey.CASCADE,
-		)
-	]
+		),
+	],
 )
 data class HistoryEntity(
 	@PrimaryKey(autoGenerate = false)
@@ -28,4 +28,5 @@ data class HistoryEntity(
 	@ColumnInfo(name = "scroll") val scroll: Float,
 	@ColumnInfo(name = "percent") val percent: Float,
 	@ColumnInfo(name = "deleted_at") val deletedAt: Long,
+	@ColumnInfo(name = "chapters") val chaptersCount: Int,
 )

app/src/main/kotlin/org/koitharu/kotatsu/history/data/HistoryRepository.kt

@@ -94,6 +94,7 @@ class HistoryRepository @Inject constructor(
 		if (!force && shouldSkip(manga)) {
 			return
 		}
+		assert(manga.chapters != null)
 		db.withTransaction {
 			mangaRepository.storeManga(manga)
 			db.getHistoryDao().upsert(
@@ -105,6 +106,7 @@ class HistoryRepository @Inject constructor(
 					page = page,
 					scroll = scroll.toFloat(), // we migrate to int, but decide to not update database
 					percent = percent,
+					chaptersCount = manga.chapters?.size ?: -1,
 					deletedAt = 0L,
 				),
 			)

app/src/main/kotlin/org/koitharu/kotatsu/history/ui/HistoryListFragment.kt

@@ -11,7 +11,9 @@ import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.os.NetworkManageIntent
 import org.koitharu.kotatsu.core.ui.list.ListSelectionController
 import org.koitharu.kotatsu.core.ui.list.RecyclerScrollKeeper
+import org.koitharu.kotatsu.core.ui.util.MenuInvalidator
 import org.koitharu.kotatsu.core.util.ext.addMenuProvider
+import org.koitharu.kotatsu.core.util.ext.observe
 import org.koitharu.kotatsu.databinding.FragmentListBinding
 import org.koitharu.kotatsu.list.ui.MangaListFragment
 import org.koitharu.kotatsu.list.ui.size.DynamicItemSizeResolver
@@ -27,6 +29,7 @@ class HistoryListFragment : MangaListFragment() {
 		super.onViewBindingCreated(binding, savedInstanceState)
 		RecyclerScrollKeeper(binding.recyclerView).attach()
 		addMenuProvider(HistoryListMenuProvider(binding.root.context, viewModel))
+		viewModel.isStatsEnabled.observe(viewLifecycleOwner, MenuInvalidator(requireActivity()))
 	}
 
 	override fun onScrolledToEnd() = Unit

app/src/main/kotlin/org/koitharu/kotatsu/history/ui/HistoryListMenuProvider.kt

@@ -1,6 +1,7 @@
 package org.koitharu.kotatsu.history.ui
 
 import android.content.Context
+import android.content.Intent
 import android.view.Menu
 import android.view.MenuInflater
 import android.view.MenuItem
@@ -9,6 +10,7 @@ import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.ui.dialog.RememberSelectionDialogListener
 import org.koitharu.kotatsu.core.util.ext.DIALOG_THEME_CENTERED
+import org.koitharu.kotatsu.stats.ui.StatsActivity
 import java.time.Instant
 import java.time.LocalDate
 import java.time.ZoneId
@@ -24,6 +26,11 @@ class HistoryListMenuProvider(
 		menuInflater.inflate(R.menu.opt_history, menu)
 	}
 
+	override fun onPrepareMenu(menu: Menu) {
+		super.onPrepareMenu(menu)
+		menu.findItem(R.id.action_stats)?.isVisible = viewModel.isStatsEnabled.value
+	}
+
 	override fun onMenuItemSelected(menuItem: MenuItem): Boolean {
 		return when (menuItem.itemId) {
 			R.id.action_clear_history -> {
@@ -31,6 +38,11 @@ class HistoryListMenuProvider(
 				true
 			}
 
+			R.id.action_stats -> {
+				context.startActivity(Intent(context, StatsActivity::class.java))
+				true
+			}
+
 			else -> false
 		}
 	}

app/src/main/kotlin/org/koitharu/kotatsu/history/ui/HistoryListViewModel.kt

@@ -71,6 +71,12 @@ class HistoryListViewModel @Inject constructor(
 		g && s.isGroupingSupported()
 	}
 
+	val isStatsEnabled = settings.observeAsStateFlow(
+		scope = viewModelScope + Dispatchers.Default,
+		key = AppSettings.KEY_STATS_ENABLED,
+		valueProducer = { isStatsEnabled },
+	)
+
 	override val content = combine(
 		sortOrder.flatMapLatest { repository.observeAllWithHistory(it) },
 		isGroupingEnabled,

app/src/main/kotlin/org/koitharu/kotatsu/local/ui/info/LocalInfoDialog.kt

@@ -2,18 +2,11 @@ package org.koitharu.kotatsu.local.ui.info
 
 import android.content.res.ColorStateList
 import android.os.Bundle
-import android.os.Parcelable
 import android.view.LayoutInflater
-import android.view.View
 import android.view.ViewGroup
-import androidx.annotation.AttrRes
-import androidx.annotation.ColorInt
-import androidx.annotation.StringRes
-import androidx.core.graphics.ColorUtils
 import androidx.core.widget.TextViewCompat
 import androidx.fragment.app.FragmentManager
 import androidx.fragment.app.viewModels
-import com.google.android.material.color.MaterialColors
 import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import dagger.hilt.android.AndroidEntryPoint
 import kotlinx.coroutines.flow.combine
@@ -21,16 +14,13 @@ import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.model.parcelable.ParcelableManga
 import org.koitharu.kotatsu.core.ui.AlertDialogFragment
 import org.koitharu.kotatsu.core.ui.widgets.SegmentedBarView
-import org.koitharu.kotatsu.core.util.Colors
+import org.koitharu.kotatsu.core.util.KotatsuColors
 import org.koitharu.kotatsu.core.util.FileSize
-import org.koitharu.kotatsu.core.util.ext.combine
-import org.koitharu.kotatsu.core.util.ext.getThemeColor
 import org.koitharu.kotatsu.core.util.ext.observe
 import org.koitharu.kotatsu.core.util.ext.showDistinct
 import org.koitharu.kotatsu.core.util.ext.withArgs
 import org.koitharu.kotatsu.databinding.DialogLocalInfoBinding
 import org.koitharu.kotatsu.parsers.model.Manga
-import org.koitharu.kotatsu.settings.userdata.StorageUsage
 import com.google.android.material.R as materialR
 
 @AndroidEntryPoint
@@ -67,7 +57,7 @@ class LocalInfoDialog : AlertDialogFragment<DialogLocalInfoBinding>() {
 		val total = size + available
 		val segment = SegmentedBarView.Segment(
 			percent = (size.toDouble() / total.toDouble()).toFloat(),
-			color = Colors.segmentColor(view.context, materialR.attr.colorPrimary),
+			color = KotatsuColors.segmentColor(view.context, materialR.attr.colorPrimary),
 		)
 		requireViewBinding().labelUsed.text = view.context.getString(
 			R.string.memory_usage_pattern,

app/src/main/kotlin/org/koitharu/kotatsu/main/ui/protect/ProtectActivity.kt

@@ -44,6 +44,12 @@ class ProtectActivity :
 		viewBinding.buttonNext.setOnClickListener(this)
 		viewBinding.buttonCancel.setOnClickListener(this)
 
+		viewBinding.editPassword.inputType = if (viewModel.isNumericPassword) {
+			EditorInfo.TYPE_CLASS_NUMBER or EditorInfo.TYPE_NUMBER_VARIATION_PASSWORD
+		} else {
+			EditorInfo.TYPE_CLASS_TEXT or EditorInfo.TYPE_TEXT_VARIATION_PASSWORD
+		}
+
 		viewModel.onError.observeEvent(this, this::onError)
 		viewModel.isLoading.observe(this, this::onLoadingStateChanged)
 		viewModel.onUnlockSuccess.observeEvent(this) {

app/src/main/kotlin/org/koitharu/kotatsu/main/ui/protect/ProtectViewModel.kt

@@ -8,6 +8,7 @@ import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.core.ui.BaseViewModel
 import org.koitharu.kotatsu.core.util.ext.MutableEventFlow
 import org.koitharu.kotatsu.core.util.ext.call
+import org.koitharu.kotatsu.parsers.util.isNumeric
 import org.koitharu.kotatsu.parsers.util.md5
 import javax.inject.Inject
 
@@ -26,6 +27,9 @@ class ProtectViewModel @Inject constructor(
 	val isBiometricEnabled
 		get() = settings.isBiometricProtectionEnabled
 
+	val isNumericPassword
+		get() = settings.isAppPasswordNumeric
+
 	fun tryUnlock(password: String) {
 		if (job?.isActive == true) {
 			return

app/src/main/kotlin/org/koitharu/kotatsu/reader/ui/ReaderActivity.kt

@@ -176,6 +176,11 @@ class ReaderActivity :
 		idlingDetector.onUserInteraction()
 	}
 
+	override fun onPause() {
+		super.onPause()
+		viewModel.onPause()
+	}
+
 	override fun onIdle() {
 		viewModel.saveCurrentState(readerManager.currentReader?.getCurrentState())
 	}

app/src/main/kotlin/org/koitharu/kotatsu/reader/ui/ReaderViewModel.kt

@@ -58,6 +58,7 @@ import org.koitharu.kotatsu.reader.domain.DetectReaderModeUseCase
 import org.koitharu.kotatsu.reader.domain.PageLoader
 import org.koitharu.kotatsu.reader.ui.config.ReaderSettings
 import org.koitharu.kotatsu.reader.ui.pager.ReaderUiState
+import org.koitharu.kotatsu.stats.domain.StatsCollector
 import java.time.Instant
 import javax.inject.Inject
 
@@ -78,11 +79,11 @@ class ReaderViewModel @Inject constructor(
 	private val detailsLoadUseCase: DetailsLoadUseCase,
 	private val historyUpdateUseCase: HistoryUpdateUseCase,
 	private val detectReaderModeUseCase: DetectReaderModeUseCase,
+	private val statsCollector: StatsCollector,
 ) : BaseViewModel() {
 
 	private val intent = MangaIntent(savedStateHandle)
 	private val preselectedBranch = savedStateHandle.get<String>(ReaderActivity.EXTRA_BRANCH)
-	private val isIncognito = savedStateHandle.get<Boolean>(ReaderActivity.EXTRA_INCOGNITO) ?: false
 
 	private var loadingJob: Job? = null
 	private var pageSaveJob: Job? = null
@@ -98,7 +99,7 @@ class ReaderViewModel @Inject constructor(
 	val onShowToast = MutableEventFlow<Int>()
 	val uiState = MutableStateFlow<ReaderUiState?>(null)
 
-	val incognitoMode = if (isIncognito) {
+	val incognitoMode = if (savedStateHandle.get<Boolean>(ReaderActivity.EXTRA_INCOGNITO) == true) {
 		MutableStateFlow(true)
 	} else mangaFlow.map {
 		it != null && historyRepository.shouldSkip(it)
@@ -190,6 +191,12 @@ class ReaderViewModel @Inject constructor(
 		loadImpl()
 	}
 
+	fun onPause() {
+		manga?.let {
+			statsCollector.onPause(it.id)
+		}
+	}
+
 	fun switchMode(newMode: ReaderMode) {
 		launchJob {
 			val manga = checkNotNull(mangaData.value?.toManga())
@@ -208,7 +215,7 @@ class ReaderViewModel @Inject constructor(
 		if (state != null) {
 			currentState.value = state
 		}
-		if (isIncognito) {
+		if (incognitoMode.value) {
 			return
 		}
 		val readerState = state ?: currentState.value ?: return
@@ -377,7 +384,7 @@ class ReaderViewModel @Inject constructor(
 
 			chaptersLoader.loadSingleChapter(requireNotNull(currentState.value).chapterId)
 			// save state
-			if (!isIncognito) {
+			if (!incognitoMode.value) {
 				currentState.value?.let {
 					val percent = computePercent(it.chapterId, it.page)
 					historyUpdateUseCase.invoke(manga, it, percent)
@@ -426,6 +433,9 @@ class ReaderViewModel @Inject constructor(
 			percent = computePercent(state.chapterId, state.page),
 		)
 		uiState.value = newState
+		if (!incognitoMode.value) {
+			statsCollector.onStateChanged(m.id, state)
+		}
 	}
 
 	private fun computePercent(chapterId: Long, pageIndex: Int): Float {

app/src/main/kotlin/org/koitharu/kotatsu/settings/ServicesSettingsFragment.kt

@@ -1,7 +1,6 @@
 package org.koitharu.kotatsu.settings
 
 import android.accounts.AccountManager
-import android.content.ActivityNotFoundException
 import android.content.Intent
 import android.content.SharedPreferences
 import android.net.Uri
@@ -17,6 +16,7 @@ import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.core.ui.BasePreferenceFragment
 import org.koitharu.kotatsu.core.util.ext.getDisplayMessage
+import org.koitharu.kotatsu.core.util.ext.printStackTraceDebug
 import org.koitharu.kotatsu.core.util.ext.viewLifecycleScope
 import org.koitharu.kotatsu.scrobbling.anilist.data.AniListRepository
 import org.koitharu.kotatsu.scrobbling.common.data.ScrobblerRepository
@@ -29,6 +29,8 @@ import org.koitharu.kotatsu.sync.domain.SyncController
 import org.koitharu.kotatsu.sync.ui.SyncSettingsIntent
 import org.koitharu.kotatsu.core.util.ext.printStackTraceDebug
 import org.koitharu.kotatsu.scrobbling.kitsu.ui.KitsuAuthActivity
+import org.koitharu.kotatsu.settings.utils.SplitSwitchPreference
+import org.koitharu.kotatsu.stats.ui.StatsActivity
 import javax.inject.Inject
 
 @AndroidEntryPoint
@@ -52,11 +54,18 @@ class ServicesSettingsFragment : BasePreferenceFragment(R.string.services),
 
 	override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
 		addPreferencesFromResource(R.xml.pref_services)
-		bindSuggestionsSummary()
+		findPreference<SplitSwitchPreference>(AppSettings.KEY_STATS_ENABLED)?.let {
+			it.onContainerClickListener = Preference.OnPreferenceClickListener {
+				it.context.startActivity(Intent(it.context, StatsActivity::class.java))
+				true
+			}
+		}
 	}
 
 	override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
 		super.onViewCreated(view, savedInstanceState)
+		bindSuggestionsSummary()
+		bindStatsSummary()
 		settings.subscribe(this)
 	}
 
@@ -77,6 +86,7 @@ class ServicesSettingsFragment : BasePreferenceFragment(R.string.services),
 	override fun onSharedPreferenceChanged(prefs: SharedPreferences?, key: String?) {
 		when (key) {
 			AppSettings.KEY_SUGGESTIONS -> bindSuggestionsSummary()
+			AppSettings.KEY_STATS_ENABLED -> bindStatsSummary()
 		}
 	}
 
@@ -195,4 +205,10 @@ class ServicesSettingsFragment : BasePreferenceFragment(R.string.services),
 			if (settings.isSuggestionsEnabled) R.string.enabled else R.string.disabled,
 		)
 	}
+
+	private fun bindStatsSummary() {
+		findPreference<Preference>(AppSettings.KEY_STATS_ENABLED)?.setSummary(
+			if (settings.isStatsEnabled) R.string.enabled else R.string.disabled,
+		)
+	}
 }

app/src/main/kotlin/org/koitharu/kotatsu/settings/protect/ProtectSetupViewModel.kt

@@ -12,6 +12,7 @@ import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.core.ui.BaseViewModel
 import org.koitharu.kotatsu.core.util.ext.MutableEventFlow
 import org.koitharu.kotatsu.core.util.ext.call
+import org.koitharu.kotatsu.parsers.util.isNumeric
 import org.koitharu.kotatsu.parsers.util.md5
 import javax.inject.Inject
 
@@ -39,6 +40,7 @@ class ProtectSetupViewModel @Inject constructor(
 		} else {
 			if (firstPassword.value == password) {
 				settings.appPassword = password.md5()
+				settings.isAppPasswordNumeric = password.isNumeric()
 				onPasswordSet.call(Unit)
 			} else {
 				onPasswordMismatch.call(Unit)

app/src/main/kotlin/org/koitharu/kotatsu/settings/userdata/StorageUsagePreference.kt

@@ -3,20 +3,15 @@ package org.koitharu.kotatsu.settings.userdata
 import android.content.Context
 import android.content.res.ColorStateList
 import android.util.AttributeSet
-import androidx.annotation.AttrRes
-import androidx.annotation.ColorInt
 import androidx.annotation.StringRes
-import androidx.core.graphics.ColorUtils
 import androidx.core.widget.TextViewCompat
 import androidx.preference.Preference
 import androidx.preference.PreferenceViewHolder
-import com.google.android.material.color.MaterialColors
 import kotlinx.coroutines.flow.FlowCollector
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.ui.widgets.SegmentedBarView
-import org.koitharu.kotatsu.core.util.Colors
+import org.koitharu.kotatsu.core.util.KotatsuColors
 import org.koitharu.kotatsu.core.util.FileSize
-import org.koitharu.kotatsu.core.util.ext.getThemeColor
 import org.koitharu.kotatsu.databinding.PreferenceMemoryUsageBinding
 import com.google.android.material.R as materialR
 
@@ -39,15 +34,15 @@ class StorageUsagePreference @JvmOverloads constructor(
 		val binding = PreferenceMemoryUsageBinding.bind(holder.itemView)
 		val storageSegment = SegmentedBarView.Segment(
 			usage?.savedManga?.percent ?: 0f,
-			Colors.segmentColor(context, materialR.attr.colorPrimary),
+			KotatsuColors.segmentColor(context, materialR.attr.colorPrimary),
 		)
 		val pagesSegment = SegmentedBarView.Segment(
 			usage?.pagesCache?.percent ?: 0f,
-			Colors.segmentColor(context, materialR.attr.colorSecondary),
+			KotatsuColors.segmentColor(context, materialR.attr.colorSecondary),
 		)
 		val otherSegment = SegmentedBarView.Segment(
 			usage?.otherCache?.percent ?: 0f,
-			Colors.segmentColor(context, materialR.attr.colorTertiary),
+			KotatsuColors.segmentColor(context, materialR.attr.colorTertiary),
 		)
 
 		with(binding) {

app/src/main/kotlin/org/koitharu/kotatsu/settings/utils/SplitSwitchPreference.kt

@@ -0,0 +1,32 @@
+package org.koitharu.kotatsu.settings.utils
+
+import android.content.Context
+import android.util.AttributeSet
+import android.view.View
+import androidx.preference.PreferenceViewHolder
+import androidx.preference.SwitchPreferenceCompat
+import org.koitharu.kotatsu.R
+
+class SplitSwitchPreference @JvmOverloads constructor(
+	context: Context,
+	attrs: AttributeSet? = null,
+	defStyleAttr: Int = androidx.preference.R.attr.switchPreferenceCompatStyle,
+	defStyleRes: Int = 0
+) : SwitchPreferenceCompat(context, attrs, defStyleAttr, defStyleRes) {
+
+	init {
+		layoutResource = R.layout.preference_split_switch
+	}
+
+	var onContainerClickListener: OnPreferenceClickListener? = null
+
+	private val containerClickListener = View.OnClickListener { v ->
+		onContainerClickListener?.onPreferenceClick(this)
+	}
+
+	override fun onBindViewHolder(holder: PreferenceViewHolder) {
+		super.onBindViewHolder(holder)
+		holder.findViewById(R.id.press_container)?.setOnClickListener(containerClickListener)
+	}
+
+}

app/src/main/kotlin/org/koitharu/kotatsu/stats/data/StatsDao.kt

@@ -0,0 +1,69 @@
+package org.koitharu.kotatsu.stats.data
+
+import android.database.sqlite.SQLiteQueryBuilder
+import androidx.room.Dao
+import androidx.room.MapColumn
+import androidx.room.Query
+import androidx.room.RawQuery
+import androidx.room.Transaction
+import androidx.room.Upsert
+import androidx.sqlite.db.SimpleSQLiteQuery
+import androidx.sqlite.db.SupportSQLiteQuery
+import kotlinx.coroutines.flow.Flow
+import org.koitharu.kotatsu.core.db.entity.MangaEntity
+import org.koitharu.kotatsu.history.data.HistoryEntity
+import org.koitharu.kotatsu.history.data.HistoryWithManga
+
+@Dao
+abstract class StatsDao {
+
+	@Query("SELECT * FROM stats ORDER BY started_at")
+	abstract suspend fun findAll(): List<StatsEntity>
+
+	@Query("SELECT * FROM stats WHERE manga_id = :mangaId ORDER BY started_at")
+	abstract suspend fun findAll(mangaId: Long): List<StatsEntity>
+
+	@Query("SELECT IFNULL(SUM(pages),0) FROM stats WHERE manga_id = :mangaId")
+	abstract suspend fun getReadPagesCount(mangaId: Long): Int
+
+	@Query("SELECT IFNULL(SUM(duration)/SUM(pages), 0) FROM stats WHERE manga_id = :mangaId")
+	abstract suspend fun getAverageTimePerPage(mangaId: Long): Long
+
+	@Query("SELECT IFNULL(SUM(duration)/SUM(pages), 0) FROM stats")
+	abstract suspend fun getAverageTimePerPage(): Long
+
+	@Query("SELECT IFNULL(SUM(duration), 0) FROM stats WHERE manga_id = :mangaId")
+	abstract suspend fun getReadingTime(mangaId: Long): Long
+
+	@Query("SELECT IFNULL(SUM(duration), 0) FROM stats")
+	abstract suspend fun getTotalReadingTime(): Long
+
+	@Query("DELETE FROM stats")
+	abstract suspend fun clear()
+
+	@Upsert
+	abstract suspend fun upsert(entity: StatsEntity)
+
+	suspend fun getDurationStats(fromDate: Long, isNsfw: Boolean?, favouriteCategories: Set<Long>): Map<MangaEntity, Long> {
+		val conditions = ArrayList<String>()
+		conditions.add("stats.started_at >= $fromDate")
+		if (favouriteCategories.isNotEmpty()) {
+			val ids = favouriteCategories.joinToString(",")
+			conditions.add("stats.manga_id IN (SELECT manga_id FROM favourites WHERE category_id IN ($ids))")
+		}
+		if (isNsfw != null) {
+			val flag = if (isNsfw) 1 else 0
+			conditions.add("manga.nsfw = $flag")
+		}
+		val where = conditions.joinToString(separator = " AND ")
+		val query = SimpleSQLiteQuery(
+			"SELECT manga.*, SUM(duration) AS d FROM stats LEFT JOIN manga ON manga.manga_id = stats.manga_id WHERE $where GROUP BY manga.manga_id ORDER BY d DESC",
+		)
+		return getDurationStatsImpl(query)
+	}
+
+	@RawQuery
+	protected abstract fun getDurationStatsImpl(
+		query: SupportSQLiteQuery
+	): Map<@MapColumn("manga") MangaEntity, @MapColumn("d") Long>
+}

app/src/main/kotlin/org/koitharu/kotatsu/stats/data/StatsEntity.kt

@@ -0,0 +1,26 @@
+package org.koitharu.kotatsu.stats.data
+
+import androidx.room.ColumnInfo
+import androidx.room.Entity
+import androidx.room.ForeignKey
+import org.koitharu.kotatsu.core.db.entity.MangaEntity
+import org.koitharu.kotatsu.history.data.HistoryEntity
+
+@Entity(
+	tableName = "stats",
+	primaryKeys = ["manga_id", "started_at"],
+	foreignKeys = [
+		ForeignKey(
+			entity = HistoryEntity::class,
+			parentColumns = ["manga_id"],
+			childColumns = ["manga_id"],
+			onDelete = ForeignKey.CASCADE,
+		),
+	],
+)
+data class StatsEntity(
+	@ColumnInfo(name = "manga_id") val mangaId: Long,
+	@ColumnInfo(name = "started_at") val startedAt: Long,
+	@ColumnInfo(name = "duration") val duration: Long,
+	@ColumnInfo(name = "pages") val pages: Int,
+)

app/src/main/kotlin/org/koitharu/kotatsu/stats/data/StatsRepository.kt

@@ -0,0 +1,74 @@
+package org.koitharu.kotatsu.stats.data
+
+import androidx.collection.LongIntMap
+import androidx.collection.MutableLongIntMap
+import androidx.room.withTransaction
+import org.koitharu.kotatsu.core.db.MangaDatabase
+import org.koitharu.kotatsu.core.db.entity.toManga
+import org.koitharu.kotatsu.stats.domain.StatsPeriod
+import org.koitharu.kotatsu.stats.domain.StatsRecord
+import java.util.NavigableMap
+import java.util.TreeMap
+import java.util.concurrent.TimeUnit
+import javax.inject.Inject
+
+class StatsRepository @Inject constructor(
+	private val db: MangaDatabase,
+) {
+
+	suspend fun getReadingStats(period: StatsPeriod, categories: Set<Long>): List<StatsRecord> {
+		val fromDate = if (period == StatsPeriod.ALL) {
+			0L
+		} else {
+			System.currentTimeMillis() - TimeUnit.DAYS.toMillis(period.days.toLong())
+		}
+		val stats = db.getStatsDao().getDurationStats(fromDate, null, categories)
+		val result = ArrayList<StatsRecord>(stats.size)
+		var other = StatsRecord(null, 0)
+		val total = stats.values.sum()
+		for ((mangaEntity, duration) in stats) {
+			val manga = mangaEntity.toManga(emptySet())
+			val percent = duration.toDouble() / total
+			if (percent < 0.05) {
+				other = other.copy(duration = other.duration + duration)
+			} else {
+				result += StatsRecord(
+					manga = manga,
+					duration = duration,
+				)
+			}
+		}
+		if (other.duration != 0L) {
+			result += other
+		}
+		return result
+	}
+
+	suspend fun getTimePerPage(mangaId: Long): Long = db.withTransaction {
+		val dao = db.getStatsDao()
+		val pages = dao.getReadPagesCount(mangaId)
+		val time = if (pages >= 10) {
+			dao.getAverageTimePerPage(mangaId)
+		} else {
+			dao.getAverageTimePerPage()
+		}
+		time
+	}
+
+	suspend fun getTotalPagesRead(mangaId: Long): Int {
+		return db.getStatsDao().getReadPagesCount(mangaId)
+	}
+
+	suspend fun getMangaTimeline(mangaId: Long): NavigableMap<Long, Int> {
+		val entities = db.getStatsDao().findAll(mangaId)
+		val map = TreeMap<Long, Int>()
+		for (e in entities) {
+			map[e.startedAt] = e.pages
+		}
+		return map
+	}
+
+	suspend fun clearStats() {
+		db.getStatsDao().clear()
+	}
+}

app/src/main/kotlin/org/koitharu/kotatsu/stats/domain/StatsCollector.kt

@@ -0,0 +1,73 @@
+package org.koitharu.kotatsu.stats.domain
+
+import androidx.collection.LongSparseArray
+import androidx.collection.set
+import dagger.hilt.android.ViewModelLifecycle
+import dagger.hilt.android.scopes.ViewModelScoped
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+import org.koitharu.kotatsu.core.db.MangaDatabase
+import org.koitharu.kotatsu.core.prefs.AppSettings
+import org.koitharu.kotatsu.core.util.RetainedLifecycleCoroutineScope
+import org.koitharu.kotatsu.reader.ui.ReaderState
+import org.koitharu.kotatsu.stats.data.StatsEntity
+import javax.inject.Inject
+
+@ViewModelScoped
+class StatsCollector @Inject constructor(
+	private val db: MangaDatabase,
+	private val settings: AppSettings,
+	lifecycle: ViewModelLifecycle,
+) {
+
+	private val viewModelScope = RetainedLifecycleCoroutineScope(lifecycle)
+	private val stats = LongSparseArray<Entry>(1)
+
+	@Synchronized
+	fun onStateChanged(mangaId: Long, state: ReaderState) {
+		if (!settings.isStatsEnabled) {
+			return
+		}
+		val now = System.currentTimeMillis()
+		val entry = stats[mangaId]
+		if (entry == null) {
+			stats[mangaId] = Entry(
+				state = state,
+				stats = StatsEntity(
+					mangaId = mangaId,
+					startedAt = now,
+					duration = 0,
+					pages = 0,
+				),
+			)
+			return
+		}
+		val pagesDelta = if (entry.state.page != state.page || entry.state.chapterId != state.chapterId) 1 else 0
+		val newEntry = entry.copy(
+			stats = StatsEntity(
+				mangaId = mangaId,
+				startedAt = entry.stats.startedAt,
+				duration = now - entry.stats.startedAt,
+				pages = entry.stats.pages + pagesDelta,
+			),
+		)
+		stats[mangaId] = newEntry
+		commit(newEntry.stats)
+	}
+
+	@Synchronized
+	fun onPause(mangaId: Long) {
+		stats.remove(mangaId)
+	}
+
+	private fun commit(entity: StatsEntity) {
+		viewModelScope.launch(Dispatchers.Default) {
+			db.getStatsDao().upsert(entity)
+		}
+	}
+
+	private data class Entry(
+		val state: ReaderState,
+		val stats: StatsEntity,
+	)
+}

app/src/main/kotlin/org/koitharu/kotatsu/stats/domain/StatsPeriod.kt

@@ -0,0 +1,16 @@
+package org.koitharu.kotatsu.stats.domain
+
+import androidx.annotation.StringRes
+import org.koitharu.kotatsu.R
+
+enum class StatsPeriod(
+	@StringRes val titleResId: Int,
+	val days: Int,
+) {
+
+	DAY(R.string.day, 1),
+	WEEK(R.string.week, 7),
+	MONTH(R.string.month, 30),
+	MONTHS_3(R.string.three_months, 90),
+	ALL(R.string.all_time, Int.MAX_VALUE),
+}

app/src/main/kotlin/org/koitharu/kotatsu/stats/domain/StatsRecord.kt

@@ -0,0 +1,35 @@
+package org.koitharu.kotatsu.stats.domain
+
+import android.content.Context
+import androidx.annotation.ColorInt
+import androidx.core.content.ContextCompat
+import androidx.core.graphics.ColorUtils
+import com.google.android.material.R
+import com.google.android.material.color.MaterialColors
+import org.koitharu.kotatsu.core.util.ext.getThemeColor
+import org.koitharu.kotatsu.details.data.ReadingTime
+import org.koitharu.kotatsu.list.ui.model.ListModel
+import org.koitharu.kotatsu.parsers.model.Manga
+import java.util.concurrent.TimeUnit
+import kotlin.math.absoluteValue
+
+data class StatsRecord(
+	val manga: Manga?,
+	val duration: Long,
+) : ListModel {
+
+	override fun areItemsTheSame(other: ListModel): Boolean {
+		return other is StatsRecord && other.manga == manga
+	}
+
+	val time: ReadingTime
+
+	init {
+		val minutes = TimeUnit.MILLISECONDS.toMinutes(duration).toInt()
+		time = ReadingTime(
+			minutes = minutes % 60,
+			hours = minutes / 60,
+			isContinue = false,
+		)
+	}
+}

app/src/main/kotlin/org/koitharu/kotatsu/stats/ui/StatsAD.kt

@@ -0,0 +1,28 @@
+package org.koitharu.kotatsu.stats.ui
+
+import android.content.res.ColorStateList
+import com.hannesdorfmann.adapterdelegates4.dsl.adapterDelegateViewBinding
+import org.koitharu.kotatsu.R
+import org.koitharu.kotatsu.core.ui.list.OnListItemClickListener
+import org.koitharu.kotatsu.core.util.KotatsuColors
+import org.koitharu.kotatsu.databinding.ItemStatsBinding
+import org.koitharu.kotatsu.parsers.model.Manga
+import org.koitharu.kotatsu.stats.domain.StatsRecord
+
+fun statsAD(
+	listener: OnListItemClickListener<Manga>,
+) = adapterDelegateViewBinding<StatsRecord, StatsRecord, ItemStatsBinding>(
+	{ layoutInflater, parent -> ItemStatsBinding.inflate(layoutInflater, parent, false) },
+) {
+
+	binding.root.setOnClickListener { v ->
+		listener.onItemClick(item.manga ?: return@setOnClickListener, v)
+	}
+
+	bind {
+		binding.textViewTitle.text = item.manga?.title ?: getString(R.string.other_manga)
+		binding.textViewSummary.text = item.time.format(context.resources)
+		binding.imageViewBadge.imageTintList = ColorStateList.valueOf(KotatsuColors.ofManga(context, item.manga))
+		binding.root.isClickable = item.manga != null
+	}
+}

app/src/main/kotlin/org/koitharu/kotatsu/stats/ui/StatsActivity.kt

@@ -0,0 +1,197 @@
+package org.koitharu.kotatsu.stats.ui
+
+import android.os.Bundle
+import android.view.Gravity
+import android.view.Menu
+import android.view.MenuItem
+import android.view.View
+import android.view.ViewStub
+import android.widget.CompoundButton
+import android.widget.Toast
+import androidx.activity.viewModels
+import androidx.appcompat.widget.PopupMenu
+import androidx.core.graphics.Insets
+import androidx.core.view.isGone
+import androidx.core.view.isVisible
+import androidx.recyclerview.widget.AsyncListDiffer
+import coil.ImageLoader
+import com.google.android.material.chip.Chip
+import com.google.android.material.chip.ChipDrawable
+import com.google.android.material.dialog.MaterialAlertDialogBuilder
+import dagger.hilt.android.AndroidEntryPoint
+import org.koitharu.kotatsu.R
+import org.koitharu.kotatsu.core.model.FavouriteCategory
+import org.koitharu.kotatsu.core.ui.BaseActivity
+import org.koitharu.kotatsu.core.ui.BaseListAdapter
+import org.koitharu.kotatsu.core.ui.list.OnListItemClickListener
+import org.koitharu.kotatsu.core.ui.util.ReversibleActionObserver
+import org.koitharu.kotatsu.core.util.KotatsuColors
+import org.koitharu.kotatsu.core.util.ext.DIALOG_THEME_CENTERED
+import org.koitharu.kotatsu.core.util.ext.enqueueWith
+import org.koitharu.kotatsu.core.util.ext.newImageRequest
+import org.koitharu.kotatsu.core.util.ext.observe
+import org.koitharu.kotatsu.core.util.ext.observeEvent
+import org.koitharu.kotatsu.core.util.ext.setTextAndVisible
+import org.koitharu.kotatsu.core.util.ext.showOrHide
+import org.koitharu.kotatsu.databinding.ActivityStatsBinding
+import org.koitharu.kotatsu.databinding.ItemEmptyStateBinding
+import org.koitharu.kotatsu.list.ui.adapter.ListItemType
+import org.koitharu.kotatsu.parsers.model.Manga
+import org.koitharu.kotatsu.stats.domain.StatsPeriod
+import org.koitharu.kotatsu.stats.domain.StatsRecord
+import org.koitharu.kotatsu.stats.ui.sheet.MangaStatsSheet
+import org.koitharu.kotatsu.stats.ui.views.PieChartView
+import javax.inject.Inject
+
+@AndroidEntryPoint
+class StatsActivity : BaseActivity<ActivityStatsBinding>(),
+	OnListItemClickListener<Manga>,
+	PieChartView.OnSegmentClickListener,
+	AsyncListDiffer.ListListener<StatsRecord>,
+	ViewStub.OnInflateListener, View.OnClickListener, CompoundButton.OnCheckedChangeListener {
+
+	@Inject
+	lateinit var coil: ImageLoader
+
+	private val viewModel: StatsViewModel by viewModels()
+
+	override fun onCreate(savedInstanceState: Bundle?) {
+		super.onCreate(savedInstanceState)
+		setContentView(ActivityStatsBinding.inflate(layoutInflater))
+		supportActionBar?.setDisplayHomeAsUpEnabled(true)
+		val adapter = BaseListAdapter<StatsRecord>()
+			.addDelegate(ListItemType.FEED, statsAD(this))
+			.addListListener(this)
+		viewBinding.recyclerView.adapter = adapter
+		viewBinding.chart.onSegmentClickListener = this
+		viewBinding.stubEmpty.setOnInflateListener(this)
+		viewBinding.chipPeriod.setOnClickListener(this)
+
+		viewModel.isLoading.observe(this) {
+			viewBinding.progressBar.showOrHide(it)
+		}
+		viewModel.period.observe(this) {
+			viewBinding.chipPeriod.setText(it.titleResId)
+		}
+		viewModel.favoriteCategories.observe(this, ::createCategoriesChips)
+		viewModel.onActionDone.observeEvent(this, ReversibleActionObserver(viewBinding.recyclerView))
+		viewModel.readingStats.observe(this) {
+			val sum = it.sumOf { it.duration }
+			viewBinding.chart.setData(
+				it.map { v ->
+					PieChartView.Segment(
+						value = (v.duration / 1000).toInt(),
+						label = v.manga?.title ?: getString(R.string.other_manga),
+						percent = (v.duration.toDouble() / sum).toFloat(),
+						color = KotatsuColors.ofManga(this, v.manga),
+						tag = v.manga,
+					)
+				},
+			)
+			adapter.emit(it)
+		}
+	}
+
+	override fun onWindowInsetsChanged(insets: Insets) = Unit
+
+	override fun onClick(v: View) {
+		when (v.id) {
+			R.id.chip_period -> showPeriodSelector()
+		}
+	}
+
+	override fun onCheckedChanged(buttonView: CompoundButton?, isChecked: Boolean) {
+		val category = buttonView?.tag as? FavouriteCategory ?: return
+		viewModel.setCategoryChecked(category, isChecked)
+	}
+
+	override fun onItemClick(item: Manga, view: View) {
+		MangaStatsSheet.show(supportFragmentManager, item)
+	}
+
+	override fun onSegmentClick(view: PieChartView, segment: PieChartView.Segment) {
+		val manga = segment.tag as? Manga ?: return
+		onItemClick(manga, view)
+	}
+
+	override fun onCreateOptionsMenu(menu: Menu?): Boolean {
+		menuInflater.inflate(R.menu.opt_stats, menu)
+		return super.onCreateOptionsMenu(menu)
+	}
+
+	override fun onOptionsItemSelected(item: MenuItem): Boolean {
+		return when (item.itemId) {
+			R.id.action_clear -> {
+				showClearConfirmDialog()
+				true
+			}
+
+			else -> super.onOptionsItemSelected(item)
+		}
+	}
+
+	override fun onCurrentListChanged(previousList: MutableList<StatsRecord>, currentList: MutableList<StatsRecord>) {
+		val isEmpty = currentList.isEmpty()
+		with(viewBinding) {
+			chart.isGone = isEmpty
+			recyclerView.isGone = isEmpty
+			stubEmpty.isVisible = isEmpty
+		}
+	}
+
+	override fun onInflate(stub: ViewStub?, inflated: View) {
+		val stubBinding = ItemEmptyStateBinding.bind(inflated)
+		stubBinding.icon.newImageRequest(this, R.drawable.ic_empty_history)?.enqueueWith(coil)
+		stubBinding.textPrimary.setText(R.string.text_empty_holder_primary)
+		stubBinding.textSecondary.setTextAndVisible(R.string.empty_stats_text)
+		stubBinding.buttonRetry.isVisible = false
+	}
+
+	private fun createCategoriesChips(categories: List<FavouriteCategory>) {
+		val container = viewBinding.layoutChips
+		if (container.childCount > 1) {
+			// avoid duplication
+			return
+		}
+		val checkedIds = viewModel.selectedCategories.value
+		for (category in categories) {
+			val chip = Chip(this)
+			val drawable = ChipDrawable.createFromAttributes(this, null, 0, R.style.Widget_Kotatsu_Chip_Filter)
+			chip.setChipDrawable(drawable)
+			chip.text = category.title
+			chip.tag = category
+			chip.isChecked = category.id in checkedIds
+			chip.setOnCheckedChangeListener(this)
+			container.addView(chip)
+		}
+	}
+
+	private fun showClearConfirmDialog() {
+		MaterialAlertDialogBuilder(this, DIALOG_THEME_CENTERED)
+			.setMessage(R.string.clear_stats_confirm)
+			.setTitle(R.string.clear_stats)
+			.setIcon(R.drawable.ic_delete)
+			.setNegativeButton(android.R.string.cancel, null)
+			.setPositiveButton(R.string.clear) { _, _ ->
+				viewModel.clear()
+			}.show()
+	}
+
+	private fun showPeriodSelector() {
+		val menu = PopupMenu(this, viewBinding.chipPeriod)
+		val selected = viewModel.period.value
+		for ((i, branch) in StatsPeriod.entries.withIndex()) {
+			val item = menu.menu.add(R.id.group_period, Menu.NONE, i, branch.titleResId)
+			item.isCheckable = true
+			item.isChecked = selected.ordinal == i
+		}
+		menu.menu.setGroupCheckable(R.id.group_period, true, true)
+
+		menu.setOnMenuItemClickListener {
+			StatsPeriod.entries.getOrNull(it.order)?.also {
+				viewModel.period.value = it
+			} != null
+		}
+		menu.show()
+	}
+}

app/src/main/kotlin/org/koitharu/kotatsu/stats/ui/StatsViewModel.kt

@@ -0,0 +1,73 @@
+package org.koitharu.kotatsu.stats.ui
+
+import androidx.lifecycle.viewModelScope
+import dagger.hilt.android.lifecycle.HiltViewModel
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.collectLatest
+import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.flow
+import kotlinx.coroutines.flow.stateIn
+import kotlinx.coroutines.flow.take
+import kotlinx.coroutines.flow.update
+import kotlinx.coroutines.plus
+import org.koitharu.kotatsu.R
+import org.koitharu.kotatsu.core.model.FavouriteCategory
+import org.koitharu.kotatsu.core.ui.BaseViewModel
+import org.koitharu.kotatsu.core.ui.model.DateTimeAgo
+import org.koitharu.kotatsu.core.ui.util.ReversibleAction
+import org.koitharu.kotatsu.core.util.ext.MutableEventFlow
+import org.koitharu.kotatsu.core.util.ext.call
+import org.koitharu.kotatsu.favourites.domain.FavouritesRepository
+import org.koitharu.kotatsu.stats.data.StatsRepository
+import org.koitharu.kotatsu.stats.domain.StatsPeriod
+import org.koitharu.kotatsu.stats.domain.StatsRecord
+import javax.inject.Inject
+
+@HiltViewModel
+class StatsViewModel @Inject constructor(
+	private val repository: StatsRepository,
+	private val favouritesRepository: FavouritesRepository,
+) : BaseViewModel() {
+
+	val period = MutableStateFlow(StatsPeriod.WEEK)
+	val onActionDone = MutableEventFlow<ReversibleAction>()
+	val selectedCategories = MutableStateFlow<Set<Long>>(emptySet())
+	val favoriteCategories = favouritesRepository.observeCategories()
+		.take(1)
+
+	val readingStats = MutableStateFlow<List<StatsRecord>>(emptyList())
+
+	init {
+		launchJob(Dispatchers.Default) {
+			combine<StatsPeriod, Set<Long>, Pair<StatsPeriod, Set<Long>>>(
+				period,
+				selectedCategories,
+				::Pair,
+			).collectLatest { p ->
+				readingStats.value = withLoading {
+					repository.getReadingStats(p.first, p.second)
+				}
+			}
+		}
+	}
+
+	fun setCategoryChecked(category: FavouriteCategory, checked: Boolean) {
+		val snapshot = selectedCategories.value.toMutableSet()
+		if (checked) {
+			snapshot.add(category.id)
+		} else {
+			snapshot.remove(category.id)
+		}
+		selectedCategories.value = snapshot
+	}
+
+	fun clear() {
+		launchLoadingJob(Dispatchers.Default) {
+			repository.clearStats()
+			readingStats.value = emptyList()
+			onActionDone.call(ReversibleAction(R.string.stats_cleared, null))
+		}
+	}
+}

app/src/main/kotlin/org/koitharu/kotatsu/stats/ui/sheet/MangaStatsSheet.kt

@@ -0,0 +1,82 @@
+package org.koitharu.kotatsu.stats.ui.sheet
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.collection.IntList
+import androidx.fragment.app.FragmentManager
+import androidx.fragment.app.viewModels
+import dagger.hilt.android.AndroidEntryPoint
+import org.koitharu.kotatsu.R
+import org.koitharu.kotatsu.core.model.parcelable.ParcelableManga
+import org.koitharu.kotatsu.core.ui.sheet.BaseAdaptiveSheet
+import org.koitharu.kotatsu.core.util.KotatsuColors
+import org.koitharu.kotatsu.core.util.ext.observe
+import org.koitharu.kotatsu.core.util.ext.showDistinct
+import org.koitharu.kotatsu.core.util.ext.textAndVisible
+import org.koitharu.kotatsu.core.util.ext.withArgs
+import org.koitharu.kotatsu.databinding.SheetStatsMangaBinding
+import org.koitharu.kotatsu.details.ui.DetailsActivity
+import org.koitharu.kotatsu.parsers.model.Manga
+import org.koitharu.kotatsu.parsers.util.format
+import org.koitharu.kotatsu.stats.ui.views.BarChartView
+
+@AndroidEntryPoint
+class MangaStatsSheet : BaseAdaptiveSheet<SheetStatsMangaBinding>(), View.OnClickListener {
+
+	private val viewModel: MangaStatsViewModel by viewModels()
+
+	override fun onCreateViewBinding(inflater: LayoutInflater, container: ViewGroup?): SheetStatsMangaBinding {
+		return SheetStatsMangaBinding.inflate(inflater, container, false)
+	}
+
+	override fun onViewBindingCreated(binding: SheetStatsMangaBinding, savedInstanceState: Bundle?) {
+		super.onViewBindingCreated(binding, savedInstanceState)
+		binding.textViewTitle.text = viewModel.manga.title
+		binding.chartView.barColor = KotatsuColors.ofManga(binding.root.context, viewModel.manga)
+		viewModel.stats.observe(viewLifecycleOwner, ::onStatsChanged)
+		viewModel.startDate.observe(viewLifecycleOwner) {
+			binding.textViewStart.textAndVisible = it?.format(resources)
+		}
+		viewModel.totalPagesRead.observe(viewLifecycleOwner) {
+			binding.textViewPages.text = getString(R.string.pages_read_s, it.format())
+		}
+		binding.buttonOpen.setOnClickListener(this)
+	}
+
+	override fun onClick(v: View) {
+		startActivity(DetailsActivity.newIntent(v.context, viewModel.manga))
+	}
+
+	private fun onStatsChanged(stats: IntList) {
+		val chartView = viewBinding?.chartView ?: return
+		if (stats.isEmpty()) {
+			chartView.setData(emptyList())
+			return
+		}
+		val bars = ArrayList<BarChartView.Bar>(stats.size)
+		stats.forEach { pages ->
+			bars.add(
+				BarChartView.Bar(
+					value = pages,
+					label = pages.toString(),
+				),
+			)
+		}
+		chartView.setData(bars)
+	}
+
+	companion object {
+
+		const val ARG_MANGA = "manga"
+
+		private const val TAG = "MangaStatsSheet"
+
+		fun show(fm: FragmentManager, manga: Manga) {
+			MangaStatsSheet().withArgs(1) {
+				putParcelable(ARG_MANGA, ParcelableManga(manga))
+			}.showDistinct(fm, TAG)
+		}
+	}
+}

app/src/main/kotlin/org/koitharu/kotatsu/stats/ui/sheet/MangaStatsViewModel.kt

@@ -0,0 +1,58 @@
+package org.koitharu.kotatsu.stats.ui.sheet
+
+import androidx.collection.IntList
+import androidx.collection.LongIntMap
+import androidx.collection.MutableIntList
+import androidx.collection.emptyIntList
+import androidx.collection.emptyLongIntMap
+import androidx.lifecycle.SavedStateHandle
+import dagger.hilt.android.lifecycle.HiltViewModel
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.MutableStateFlow
+import org.koitharu.kotatsu.core.model.parcelable.ParcelableManga
+import org.koitharu.kotatsu.core.ui.BaseViewModel
+import org.koitharu.kotatsu.core.ui.model.DateTimeAgo
+import org.koitharu.kotatsu.core.util.ext.calculateTimeAgo
+import org.koitharu.kotatsu.core.util.ext.require
+import org.koitharu.kotatsu.stats.data.StatsRepository
+import org.koitharu.kotatsu.stats.domain.StatsRecord
+import java.time.Instant
+import java.util.concurrent.TimeUnit
+import javax.inject.Inject
+
+@HiltViewModel
+class MangaStatsViewModel @Inject constructor(
+	savedStateHandle: SavedStateHandle,
+	private val repository: StatsRepository,
+) : BaseViewModel() {
+
+	val manga = savedStateHandle.require<ParcelableManga>(MangaStatsSheet.ARG_MANGA).manga
+
+	val stats = MutableStateFlow<IntList>(emptyIntList())
+	val startDate = MutableStateFlow<DateTimeAgo?>(null)
+	val totalPagesRead = MutableStateFlow(0)
+
+	init {
+		launchLoadingJob(Dispatchers.Default) {
+			val timeline = repository.getMangaTimeline(manga.id)
+			if (timeline.isEmpty()) {
+				startDate.value = null
+				stats.value = emptyIntList()
+			} else {
+				val startDay = TimeUnit.MILLISECONDS.toDays(timeline.firstKey())
+				val endDay = TimeUnit.MILLISECONDS.toDays(System.currentTimeMillis())
+				val res = MutableIntList((endDay - startDay).toInt() + 1)
+				for (day in startDay..endDay) {
+					val from = TimeUnit.DAYS.toMillis(day)
+					val to = TimeUnit.DAYS.toMillis(day + 1)
+					res.add(timeline.subMap(from, true, to, false).values.sum())
+				}
+				stats.value = res
+				startDate.value = calculateTimeAgo(Instant.ofEpochMilli(timeline.firstKey()))
+			}
+		}
+		launchLoadingJob(Dispatchers.Default) {
+			totalPagesRead.value = repository.getTotalPagesRead(manga.id)
+		}
+	}
+}

app/src/main/kotlin/org/koitharu/kotatsu/stats/ui/views/BarChartView.kt

@@ -0,0 +1,172 @@
+package org.koitharu.kotatsu.stats.ui.views
+
+import android.annotation.SuppressLint
+import android.content.Context
+import android.graphics.Canvas
+import android.graphics.Color
+import android.graphics.DashPathEffect
+import android.graphics.Paint
+import android.graphics.PathEffect
+import android.graphics.PorterDuff
+import android.graphics.PorterDuffXfermode
+import android.graphics.RectF
+import android.graphics.Xfermode
+import android.util.AttributeSet
+import android.view.GestureDetector
+import android.view.MotionEvent
+import android.view.View
+import androidx.annotation.ColorInt
+import androidx.collection.MutableIntList
+import androidx.core.graphics.ColorUtils
+import androidx.core.graphics.minus
+import androidx.core.view.GestureDetectorCompat
+import androidx.core.view.setPadding
+import com.google.android.material.color.MaterialColors
+import org.koitharu.kotatsu.core.util.ext.getThemeColor
+import org.koitharu.kotatsu.core.util.ext.resolveDp
+import org.koitharu.kotatsu.parsers.util.replaceWith
+import org.koitharu.kotatsu.parsers.util.toIntUp
+import kotlin.math.absoluteValue
+import kotlin.math.max
+import kotlin.math.roundToInt
+import kotlin.math.sqrt
+import kotlin.random.Random
+import com.google.android.material.R as materialR
+
+class BarChartView @JvmOverloads constructor(
+	context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
+) : View(context, attrs, defStyleAttr) {
+
+	private val paint = Paint(Paint.ANTI_ALIAS_FLAG)
+	private val rawData = ArrayList<Bar>()
+	private val bars = ArrayList<Bar>()
+	private var maxValue: Int = 0
+	private val minBarSpacing = context.resources.resolveDp(12f)
+	private val minSpace = context.resources.resolveDp(20f)
+	private val barWidth = context.resources.resolveDp(12f)
+	private val outlineColor = context.getThemeColor(materialR.attr.colorOutline)
+	private val dottedEffect = DashPathEffect(
+		floatArrayOf(
+			context.resources.resolveDp(6f),
+			context.resources.resolveDp(6f),
+		),
+		0f,
+	)
+	private val chartBounds = RectF()
+
+	@ColorInt
+	var barColor: Int = context.getThemeColor(materialR.attr.colorAccent)
+		set(value) {
+			field = value
+			invalidate()
+		}
+
+	init {
+		paint.strokeWidth = context.resources.resolveDp(1f)
+		if (isInEditMode) {
+			setData(
+				List(Random.nextInt(20, 60)) {
+					Bar(
+						value = Random.nextInt(-20, 400).coerceAtLeast(0),
+						label = it.toString(),
+					)
+				},
+			)
+		}
+	}
+
+	override fun onDraw(canvas: Canvas) {
+		super.onDraw(canvas)
+		if (bars.isEmpty() || chartBounds.isEmpty) {
+			return
+		}
+		val spacing = (chartBounds.width() - (barWidth * bars.size.toFloat())) / (bars.size + 1).toFloat()
+		// dashed horizontal lines
+		paint.color = outlineColor
+		paint.style = Paint.Style.STROKE
+		canvas.drawLine(chartBounds.left, chartBounds.bottom, chartBounds.right, chartBounds.bottom, paint)
+		paint.pathEffect = dottedEffect
+		for (i in (0..maxValue).step(computeValueStep())) {
+			val y = chartBounds.top + (chartBounds.height() * i / maxValue.toFloat())
+			canvas.drawLine(paddingLeft.toFloat(), y, (width - paddingLeft - paddingRight).toFloat(), y, paint)
+		}
+		// bottom line
+		paint.color = outlineColor
+		paint.style = Paint.Style.STROKE
+		canvas.drawLine(chartBounds.left, chartBounds.bottom, chartBounds.right, chartBounds.bottom, paint)
+		// bars
+		paint.style = Paint.Style.FILL
+		paint.color = barColor
+		paint.pathEffect = null
+		val corner = barWidth / 2f
+		for ((i, bar) in bars.withIndex()) {
+			if (bar.value == 0) {
+				continue
+			}
+			val h = (chartBounds.height() * bar.value / maxValue.toFloat()).coerceAtLeast(barWidth)
+			val x = spacing + i * (barWidth + spacing) + paddingLeft
+			canvas.drawRoundRect(x, chartBounds.bottom - h, x + barWidth, chartBounds.bottom, corner, corner, paint)
+		}
+	}
+
+	override fun onLayout(changed: Boolean, left: Int, top: Int, right: Int, bottom: Int) {
+		super.onLayout(changed, left, top, right, bottom)
+		invalidateBounds()
+	}
+
+	fun setData(value: List<Bar>) {
+		rawData.replaceWith(value)
+		compressBars()
+		invalidate()
+	}
+
+	private fun compressBars() {
+		if (rawData.isEmpty() || width <= 0) {
+			maxValue = 0
+			bars.clear()
+			return
+		}
+		var fullWidth = rawData.size * (barWidth + minBarSpacing) + minBarSpacing
+		val windowSize = (fullWidth / width.toFloat()).toIntUp()
+		bars.replaceWith(
+			rawData.chunked(windowSize) { it.average() },
+		)
+		maxValue = bars.maxOf { it.value }
+	}
+
+	private fun computeValueStep(): Int {
+		val h = chartBounds.height()
+		var step = 1
+		while (h / (maxValue / step).toFloat() <= minSpace) {
+			step++
+		}
+		return step
+	}
+
+	private fun invalidateBounds() {
+		val inset = paint.strokeWidth
+		chartBounds.set(
+			paddingLeft.toFloat() + inset,
+			paddingTop.toFloat() + inset,
+			(width - paddingLeft - paddingRight).toFloat() - inset,
+			(height - paddingTop - paddingBottom).toFloat() - inset,
+		)
+		compressBars()
+	}
+
+	private fun Collection<Bar>.average(): Bar {
+		return when (size) {
+			0 -> Bar(0, "")
+			1 -> first()
+			else -> Bar(
+				value = (sumOf { it.value } / size.toFloat()).roundToInt(),
+				label = "%s - %s".format(first().label, last().label),
+			)
+		}
+	}
+
+	class Bar(
+		val value: Int,
+		val label: String,
+	)
+}

app/src/main/kotlin/org/koitharu/kotatsu/stats/ui/views/PieChartView.kt

@@ -0,0 +1,171 @@
+package org.koitharu.kotatsu.stats.ui.views
+
+import android.annotation.SuppressLint
+import android.content.Context
+import android.graphics.Canvas
+import android.graphics.Color
+import android.graphics.Paint
+import android.graphics.PorterDuff
+import android.graphics.PorterDuffXfermode
+import android.graphics.RectF
+import android.graphics.Xfermode
+import android.util.AttributeSet
+import android.view.GestureDetector
+import android.view.MotionEvent
+import android.view.View
+import androidx.annotation.ColorInt
+import androidx.collection.MutableIntList
+import androidx.core.graphics.ColorUtils
+import androidx.core.graphics.minus
+import androidx.core.view.GestureDetectorCompat
+import com.google.android.material.color.MaterialColors
+import org.koitharu.kotatsu.core.util.ext.getThemeColor
+import org.koitharu.kotatsu.core.util.ext.resolveDp
+import org.koitharu.kotatsu.parsers.util.replaceWith
+import kotlin.math.absoluteValue
+import kotlin.math.sqrt
+import com.google.android.material.R as materialR
+
+class PieChartView @JvmOverloads constructor(
+	context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
+) : View(context, attrs, defStyleAttr), GestureDetector.OnGestureListener {
+
+	private val paint = Paint(Paint.ANTI_ALIAS_FLAG)
+	private val segments = ArrayList<Segment>()
+	private val chartBounds = RectF()
+	private val clearColor = context.getThemeColor(android.R.attr.colorBackground)
+	private val touchDetector = GestureDetectorCompat(context, this)
+	private var hightlightedSegment = -1
+
+	var onSegmentClickListener: OnSegmentClickListener? = null
+
+	init {
+		touchDetector.setIsLongpressEnabled(false)
+		paint.strokeWidth = context.resources.resolveDp(2f)
+	}
+
+	override fun onDraw(canvas: Canvas) {
+		super.onDraw(canvas)
+		var angle = 0f
+		for ((i, segment) in segments.withIndex()) {
+			paint.color = segment.color
+			if (i == hightlightedSegment) {
+				paint.color = ColorUtils.setAlphaComponent(paint.color, 180)
+			}
+			paint.style = Paint.Style.FILL
+			val sweepAngle = segment.percent * 360f
+			canvas.drawArc(
+				chartBounds,
+				angle,
+				sweepAngle,
+				true,
+				paint,
+			)
+			paint.color = clearColor
+			paint.style = Paint.Style.STROKE
+			canvas.drawArc(
+				chartBounds,
+				angle,
+				sweepAngle,
+				true,
+				paint,
+			)
+			angle += sweepAngle
+		}
+		paint.style = Paint.Style.FILL
+		paint.color = clearColor
+		canvas.drawCircle(chartBounds.centerX(), chartBounds.centerY(), chartBounds.height() / 4f, paint)
+	}
+
+	override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
+		super.onSizeChanged(w, h, oldw, oldh)
+		val size = minOf(w, h).toFloat()
+		val inset = paint.strokeWidth
+		chartBounds.set(inset, inset, size - inset, size - inset)
+		chartBounds.offset(
+			(w - size) / 2f,
+			(h - size) / 2f,
+		)
+	}
+
+	@SuppressLint("ClickableViewAccessibility")
+	override fun onTouchEvent(event: MotionEvent): Boolean {
+		if (event.actionMasked == MotionEvent.ACTION_CANCEL || event.actionMasked == MotionEvent.ACTION_UP) {
+			hightlightedSegment = -1
+			invalidate()
+		}
+		return super.onTouchEvent(event) || touchDetector.onTouchEvent(event)
+	}
+
+	override fun onDown(e: MotionEvent): Boolean {
+		if (onSegmentClickListener == null) {
+			return false
+		}
+		val segment = findSegmentIndex(e.x, e.y)
+		if (segment != hightlightedSegment) {
+			hightlightedSegment = segment
+			invalidate()
+			return true
+		} else {
+			return false
+		}
+	}
+
+	override fun onShowPress(e: MotionEvent) = Unit
+
+	override fun onSingleTapUp(e: MotionEvent): Boolean {
+		onSegmentClickListener?.run {
+			val segment = segments.getOrNull(findSegmentIndex(e.x, e.y))
+			if (segment != null) {
+				onSegmentClick(this@PieChartView, segment)
+			}
+		}
+		return true
+	}
+
+	override fun onScroll(e1: MotionEvent?, e2: MotionEvent, distanceX: Float, distanceY: Float): Boolean = false
+
+	override fun onLongPress(e: MotionEvent) = Unit
+
+	override fun onFling(e1: MotionEvent?, e2: MotionEvent, velocityX: Float, velocityY: Float): Boolean = false
+
+	fun setData(value: List<Segment>) {
+		segments.replaceWith(value)
+		invalidate()
+	}
+
+	private fun findSegmentIndex(x: Float, y: Float): Int {
+		val dy = (y - chartBounds.centerY()).toDouble()
+		val dx = (x - chartBounds.centerX()).toDouble()
+		val distance = sqrt(dx * dx + dy * dy).toFloat()
+		if (distance < chartBounds.height() / 4f || distance > chartBounds.centerX()) {
+			return -1
+		}
+		var touchAngle = Math.toDegrees(Math.atan2(dy, dx)).toFloat()
+		if (touchAngle < 0) {
+			touchAngle += 360
+		}
+		var angle = 0f
+		for ((i, segment) in segments.withIndex()) {
+			val sweepAngle = segment.percent * 360f
+			if (touchAngle in angle..(angle + sweepAngle)) {
+				return i
+			}
+			angle += sweepAngle
+		}
+		return -1
+	}
+
+	class Segment(
+		val value: Int,
+		val label: String,
+		val percent: Float,
+		val color: Int,
+		val tag: Any?,
+	)
+
+	interface OnSegmentClickListener {
+
+		fun onSegmentClick(view: PieChartView, segment: Segment)
+	}
+}

app/src/main/res/layout/activity_stats.xml

@@ -0,0 +1,108 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout
+	xmlns:android="http://schemas.android.com/apk/res/android"
+	xmlns:app="http://schemas.android.com/apk/res-auto"
+	xmlns:tools="http://schemas.android.com/tools"
+	android:layout_width="match_parent"
+	android:layout_height="match_parent"
+	android:orientation="vertical">
+
+	<com.google.android.material.appbar.AppBarLayout
+		android:id="@+id/appbar"
+		android:layout_width="0dp"
+		android:layout_height="wrap_content"
+		android:fitsSystemWindows="true"
+		app:layout_constraintEnd_toEndOf="parent"
+		app:layout_constraintStart_toStartOf="parent"
+		app:layout_constraintTop_toTopOf="parent">
+
+		<com.google.android.material.appbar.MaterialToolbar
+			android:id="@id/toolbar"
+			android:layout_width="match_parent"
+			android:layout_height="?attr/actionBarSize"
+			app:layout_scrollFlags="noScroll">
+
+		</com.google.android.material.appbar.MaterialToolbar>
+
+	</com.google.android.material.appbar.AppBarLayout>
+
+	<com.google.android.material.progressindicator.LinearProgressIndicator
+		android:id="@+id/progressBar"
+		android:layout_width="0dp"
+		android:layout_height="wrap_content"
+		android:indeterminate="true"
+		android:visibility="gone"
+		app:hideAnimationBehavior="outward"
+		app:layout_constraintBottom_toBottomOf="@id/appbar"
+		app:layout_constraintEnd_toEndOf="parent"
+		app:layout_constraintStart_toStartOf="parent"
+		app:layout_constraintTop_toBottomOf="@id/appbar"
+		app:showAnimationBehavior="inward"
+		app:trackCornerRadius="0dp"
+		tools:visibility="visible" />
+
+	<HorizontalScrollView
+		android:id="@+id/scrollView_chips"
+		android:layout_width="0dp"
+		android:layout_height="wrap_content"
+		android:clipToPadding="false"
+		android:paddingHorizontal="12dp"
+		android:scrollbars="none"
+		app:layout_constraintEnd_toEndOf="parent"
+		app:layout_constraintStart_toStartOf="parent"
+		app:layout_constraintTop_toBottomOf="@id/appbar">
+
+		<com.google.android.material.chip.ChipGroup
+			android:id="@+id/layout_chips"
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content">
+
+			<com.google.android.material.chip.Chip
+				android:id="@+id/chip_period"
+				style="@style/Widget.Kotatsu.Chip.Dropdown"
+				android:layout_width="wrap_content"
+				android:layout_height="wrap_content"
+				android:text="@string/week"
+				app:chipIcon="@drawable/ic_history" />
+
+		</com.google.android.material.chip.ChipGroup>
+
+	</HorizontalScrollView>
+
+	<org.koitharu.kotatsu.stats.ui.views.PieChartView
+		android:id="@+id/chart"
+		android:layout_width="0dp"
+		android:layout_height="0dp"
+		android:layout_margin="24dp"
+		app:layout_constraintDimensionRatio="1"
+		app:layout_constraintEnd_toEndOf="parent"
+		app:layout_constraintStart_toStartOf="parent"
+		app:layout_constraintTop_toBottomOf="@id/scrollView_chips" />
+
+	<androidx.recyclerview.widget.RecyclerView
+		android:id="@+id/recyclerView"
+		android:layout_width="0dp"
+		android:layout_height="0dp"
+		android:layout_marginTop="24dp"
+		android:overScrollMode="ifContentScrolls"
+		android:scrollbars="vertical"
+		app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
+		app:layout_constraintBottom_toBottomOf="parent"
+		app:layout_constraintEnd_toEndOf="parent"
+		app:layout_constraintStart_toStartOf="parent"
+		app:layout_constraintTop_toBottomOf="@id/chart"
+		tools:itemCount="4"
+		tools:listitem="@layout/item_stats" />
+
+	<ViewStub
+		android:id="@+id/stub_empty"
+		android:layout_width="0dp"
+		android:layout_height="0dp"
+		android:layout="@layout/item_empty_state"
+		app:layout_constraintBottom_toBottomOf="parent"
+		app:layout_constraintEnd_toEndOf="parent"
+		app:layout_constraintStart_toStartOf="parent"
+		app:layout_constraintTop_toBottomOf="@id/scrollView_chips"
+		tools:visibility="visible" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/layout/item_stats.xml

@@ -0,0 +1,52 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+	xmlns:android="http://schemas.android.com/apk/res/android"
+	xmlns:app="http://schemas.android.com/apk/res-auto"
+	xmlns:tools="http://schemas.android.com/tools"
+	android:layout_width="match_parent"
+	android:layout_height="wrap_content"
+	android:background="@drawable/list_selector"
+	android:clipChildren="false"
+	android:gravity="center_vertical"
+	android:minHeight="?listPreferredItemHeightSmall"
+	android:orientation="horizontal"
+	android:paddingStart="?listPreferredItemPaddingStart"
+	android:paddingEnd="?listPreferredItemPaddingEnd">
+
+	<ImageView
+		android:id="@+id/imageView_badge"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:contentDescription="@null"
+		app:srcCompat="@drawable/bg_rounded_square" />
+
+	<LinearLayout
+		android:layout_width="match_parent"
+		android:layout_height="wrap_content"
+		android:orientation="vertical">
+
+		<TextView
+			android:id="@+id/textView_title"
+			android:layout_width="match_parent"
+			android:layout_height="wrap_content"
+			android:layout_marginStart="16dp"
+			android:layout_marginEnd="8dp"
+			android:ellipsize="end"
+			android:maxLines="1"
+			android:textAppearance="?attr/textAppearanceTitleSmall"
+			tools:text="@tools:sample/lorem[3]" />
+
+		<TextView
+			android:id="@+id/textView_summary"
+			android:layout_width="match_parent"
+			android:layout_height="wrap_content"
+			android:layout_marginStart="16dp"
+			android:layout_marginEnd="8dp"
+			android:ellipsize="end"
+			android:maxLines="1"
+			android:textAppearance="?attr/textAppearanceBodySmall"
+			tools:text="@tools:sample/lorem/random" />
+
+	</LinearLayout>
+
+</LinearLayout>

app/src/main/res/layout/preference_split_switch.xml

@@ -0,0 +1,74 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+	xmlns:android="http://schemas.android.com/apk/res/android"
+	xmlns:tools="http://schemas.android.com/tools"
+	android:layout_width="match_parent"
+	android:layout_height="wrap_content"
+	android:baselineAligned="false"
+	android:clipToPadding="false"
+	android:gravity="center_vertical"
+	android:orientation="horizontal"
+	android:paddingEnd="?android:attr/listPreferredItemPaddingEnd"
+	tools:ignore="RtlSymmetry">
+
+	<LinearLayout
+		android:id="@+id/press_container"
+		android:layout_width="0dp"
+		android:layout_height="wrap_content"
+		android:layout_weight="1"
+		android:background="?selectableItemBackground"
+		android:baselineAligned="false"
+		android:clipToPadding="false"
+		android:gravity="center_vertical"
+		android:minHeight="?android:attr/listPreferredItemHeightSmall"
+		android:orientation="horizontal"
+		android:paddingStart="?android:attr/listPreferredItemPaddingStart">
+
+		<include layout="@layout/image_frame" />
+
+		<RelativeLayout
+			android:layout_width="match_parent"
+			android:layout_height="wrap_content"
+			android:paddingTop="16dp"
+			android:paddingBottom="16dp">
+
+			<TextView
+				android:id="@android:id/title"
+				android:layout_width="wrap_content"
+				android:layout_height="wrap_content"
+				android:ellipsize="marquee"
+				android:singleLine="true"
+				android:textAppearance="?android:attr/textAppearanceListItem" />
+
+			<TextView
+				android:id="@android:id/summary"
+				style="@style/PreferenceSummaryTextStyle"
+				android:layout_width="wrap_content"
+				android:layout_height="wrap_content"
+				android:layout_below="@android:id/title"
+				android:layout_alignStart="@android:id/title"
+				android:layout_gravity="start"
+				android:maxLines="10"
+				android:textAlignment="viewStart"
+				android:textColor="?android:attr/textColorSecondary" />
+
+		</RelativeLayout>
+	</LinearLayout>
+
+	<View
+		android:layout_width="1dp"
+		android:layout_height="match_parent"
+		android:layout_marginVertical="16dp"
+		android:background="?dividerVertical" />
+
+	<!-- Preference should place its actual preference widget here. -->
+	<LinearLayout
+		android:id="@android:id/widget_frame"
+		android:layout_width="wrap_content"
+		android:layout_height="match_parent"
+		android:gravity="end|center_vertical"
+		android:orientation="vertical"
+		android:paddingStart="16dp"
+		android:paddingEnd="0dp" />
+
+</LinearLayout>

app/src/main/res/layout/sheet_shelf_size.xml

@@ -1,83 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<RelativeLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
-	xmlns:app="http://schemas.android.com/apk/res-auto"
-	xmlns:tools="http://schemas.android.com/tools"
-	android:layout_width="match_parent"
-	android:layout_height="wrap_content"
-	android:orientation="vertical"
-	android:paddingHorizontal="@dimen/margin_small"
-	android:paddingBottom="@dimen/margin_normal">
-
-	<com.google.android.material.bottomsheet.BottomSheetDragHandleView
-		android:id="@+id/dragHandle"
-		android:layout_width="0dp"
-		android:layout_height="wrap_content"
-		android:layout_alignParentStart="true"
-		android:layout_alignParentTop="true"
-		android:layout_alignParentEnd="true" />
-
-	<TextView
-		android:id="@+id/textView_title"
-		android:layout_width="0dp"
-		android:layout_height="wrap_content"
-		android:layout_alignWithParentIfMissing="true"
-		android:layout_below="@id/dragHandle"
-		android:layout_alignParentStart="true"
-		android:layout_toStartOf="@id/textView_label"
-		android:paddingHorizontal="@dimen/margin_small"
-		android:paddingBottom="@dimen/margin_small"
-		android:singleLine="true"
-		android:text="@string/grid_size"
-		android:textAppearance="?textAppearanceTitleMedium" />
-
-	<TextView
-		android:id="@+id/textView_label"
-		android:layout_width="wrap_content"
-		android:layout_height="wrap_content"
-		android:layout_alignBaseline="@id/textView_title"
-		android:layout_alignParentEnd="true"
-		android:paddingHorizontal="@dimen/margin_small"
-		android:singleLine="true"
-		android:textAppearance="?textAppearanceLabelLarge"
-		tools:text="100%" />
-
-	<ImageView
-		android:id="@+id/button_small"
-		android:layout_width="wrap_content"
-		android:layout_height="0dp"
-		android:layout_alignTop="@id/slider_grid"
-		android:layout_alignBottom="@id/slider_grid"
-		android:layout_alignParentStart="true"
-		android:background="?selectableItemBackgroundBorderless"
-		android:padding="8dp"
-		android:src="@drawable/ic_size_small"
-		android:theme="@style/ThemeOverlay.Kotatsu.MainToolbar" />
-
-	<ImageView
-		android:id="@+id/button_large"
-		android:layout_width="wrap_content"
-		android:layout_height="0dp"
-		android:layout_alignTop="@id/slider_grid"
-		android:layout_alignBottom="@id/slider_grid"
-		android:layout_alignParentEnd="true"
-		android:background="?selectableItemBackgroundBorderless"
-		android:padding="8dp"
-		android:src="@drawable/ic_size_large"
-		android:theme="@style/ThemeOverlay.Kotatsu.MainToolbar" />
-
-	<com.google.android.material.slider.Slider
-		android:id="@+id/slider_grid"
-		android:layout_width="0dp"
-		android:layout_height="wrap_content"
-		android:layout_below="@id/textView_title"
-		android:layout_toStartOf="@id/button_large"
-		android:layout_toEndOf="@id/button_small"
-		android:stepSize="5"
-		android:valueFrom="50"
-		android:valueTo="150"
-		app:labelBehavior="gone"
-		app:tickVisible="false"
-		tools:value="100" />
-
-</RelativeLayout>

app/src/main/res/layout/sheet_stats_manga.xml

@@ -0,0 +1,82 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+	xmlns:android="http://schemas.android.com/apk/res/android"
+	xmlns:app="http://schemas.android.com/apk/res-auto"
+	xmlns:tools="http://schemas.android.com/tools"
+	android:layout_width="match_parent"
+	android:layout_height="match_parent"
+	android:orientation="vertical"
+	android:paddingBottom="@dimen/screen_padding">
+
+	<org.koitharu.kotatsu.core.ui.sheet.AdaptiveSheetHeaderBar
+		android:id="@+id/headerBar"
+		android:layout_width="match_parent"
+		android:layout_height="wrap_content"
+		app:title="@string/reading_stats" />
+
+	<ScrollView
+		android:id="@+id/scrollView"
+		android:layout_width="match_parent"
+		android:layout_height="wrap_content"
+		android:scrollIndicators="top">
+
+		<LinearLayout
+			android:layout_width="match_parent"
+			android:layout_height="wrap_content"
+			android:orientation="vertical">
+
+			<LinearLayout
+				android:layout_width="match_parent"
+				android:layout_height="wrap_content"
+				android:gravity="center_vertical"
+				android:orientation="horizontal"
+				android:paddingHorizontal="@dimen/screen_padding">
+
+				<TextView
+					android:id="@+id/textView_title"
+					android:layout_width="0dp"
+					android:layout_height="wrap_content"
+					android:layout_weight="1"
+					android:textAppearance="?textAppearanceTitleMedium"
+					tools:text="@tools:sample/lorem[4]" />
+
+				<ImageButton
+					android:id="@+id/button_open"
+					android:layout_width="wrap_content"
+					android:layout_height="wrap_content"
+					android:background="?selectableItemBackgroundBorderless"
+					android:minWidth="?minTouchTargetSize"
+					android:minHeight="?minTouchTargetSize"
+					app:srcCompat="@drawable/ic_open_external" />
+
+			</LinearLayout>
+
+			<org.koitharu.kotatsu.stats.ui.views.BarChartView
+				android:id="@+id/chartView"
+				android:layout_width="match_parent"
+				android:layout_height="240dp"
+				android:layout_marginTop="12dp"
+				android:paddingHorizontal="@dimen/screen_padding" />
+
+			<TextView
+				android:id="@+id/textView_start"
+				android:layout_width="match_parent"
+				android:layout_height="wrap_content"
+				android:layout_marginTop="2dp"
+				android:paddingHorizontal="@dimen/screen_padding"
+				android:textAppearance="?textAppearanceLabelSmall"
+				tools:text="Week ago" />
+
+
+			<TextView
+				android:id="@+id/textView_pages"
+				android:layout_width="match_parent"
+				android:layout_height="wrap_content"
+				android:layout_marginTop="12dp"
+				android:paddingHorizontal="@dimen/screen_padding"
+				android:textAppearance="?textAppearanceBodyMedium"
+				tools:text="Total pages read: 250" />
+
+		</LinearLayout>
+	</ScrollView>
+</LinearLayout>

app/src/main/res/menu/opt_details.xml

@@ -37,6 +37,12 @@
 		android:title="@string/tracking"
 		app:showAsAction="never" />
 
+	<item
+		android:id="@+id/action_stats"
+		android:orderInCategory="50"
+		android:title="@string/statistics"
+		app:showAsAction="never" />
+
 	<item
 		android:id="@+id/action_related"
 		android:orderInCategory="50"

app/src/main/res/menu/opt_history.xml

@@ -9,4 +9,10 @@
 		android:title="@string/clear_history"
 		app:showAsAction="never" />
 
+	<item
+		android:id="@+id/action_stats"
+		android:orderInCategory="40"
+		android:title="@string/statistics"
+		app:showAsAction="never" />
+
 </menu>

app/src/main/res/menu/opt_stats.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu
+	xmlns:android="http://schemas.android.com/apk/res/android"
+	xmlns:app="http://schemas.android.com/apk/res-auto"
+	xmlns:tools="http://schemas.android.com/tools">
+
+	<item
+		android:id="@+id/action_clear"
+		android:title="@string/clear_stats"
+		android:titleCondensed="@string/clear"
+		app:showAsAction="never" />
+
+</menu>

app/src/main/res/values/attrs.xml

@@ -134,31 +134,6 @@
 		<attr name="cornerSize" />
 	</declare-styleable>
 
-	<declare-styleable name="PieChart">
-		<attr name="pieChartColors" format="reference" />
-
-		<attr name="pieChartMarginTextFirst" format="dimension" />
-		<attr name="pieChartMarginTextSecond" format="dimension" />
-		<attr name="pieChartMarginTextThird" format="dimension" />
-		<attr name="pieChartMarginSmallCircle" format="dimension" />
-
-		<attr name="pieChartCircleStrokeWidth" format="dimension" />
-		<attr name="pieChartCirclePadding" format="dimension" />
-		<attr name="pieChartCirclePaintRoundSize" format="boolean" />
-		<attr name="pieChartCircleSectionSpace" format="float" />
-
-		<attr name="pieChartTextCircleRadius" format="dimension" />
-		<attr name="pieChartTextAmountSize" format="dimension" />
-		<attr name="pieChartTextNumberSize" format="dimension" />
-		<attr name="pieChartTextDescriptionSize" format="dimension" />
-
-		<attr name="pieChartTextAmountColor" format="color" />
-		<attr name="pieChartTextNumberColor" format="color" />
-		<attr name="pieChartTextDescriptionColor" format="color" />
-
-		<attr name="pieChartTextAmount" format="string" />
-	</declare-styleable>
-
 	<declare-styleable name="NestedRecyclerView">
 		<attr name="maxHeight" />
 	</declare-styleable>

app/src/main/res/values/ids.xml

@@ -6,6 +6,7 @@
 	<item name="fast_scroller" type="id" />
 	<item name="group_branches" type="id" />
 	<item name="layout_tip" type="id" />
+	<item name="group_period" type="id" />
 	<!-- Navigation -->
 	<item name="nav_history" type="id" />
 	<item name="nav_favorites" type="id" />

app/src/main/res/values/strings.xml

@@ -603,4 +603,19 @@
 	<string name="automatic">Automatic</string>
 	<string name="single_cbz_file">Single CBZ file</string>
 	<string name="multiple_cbz_files">Multiple CBZ files</string>
+	<string name="stats_enabled">Enable statistics</string>
+	<string name="reading_stats">Reading statistics</string>
+	<string name="other_manga">Other manga</string>
+	<string name="less_than_minute">Less than a minute</string>
+	<string name="statistics">Statistics</string>
+	<string name="clear_stats">Clear statistics</string>
+	<string name="stats_cleared">Statistics cleared</string>
+	<string name="clear_stats_confirm">Do you really want to clear all reading statistics? This action cannot be undone.</string>
+	<string name="week">Week</string>
+	<string name="month">Month</string>
+	<string name="all_time">All time</string>
+	<string name="day">Day</string>
+	<string name="three_months">Three months</string>
+	<string name="empty_stats_text">There are no statistics for the selected period</string>
+	<string name="pages_read_s">Pages read: %s</string>
 </resources>

app/src/main/res/values/styles.xml

@@ -124,6 +124,12 @@
 
 	<style name="Widget.Kotatsu.Chip.Assist" parent="Widget.Material3.Chip.Assist" />
 
+	<style name="Widget.Kotatsu.Chip.Dropdown" parent="Widget.Material3.Chip.Assist">
+		<item name="closeIconVisible">true</item>
+		<item name="closeIcon">@drawable/ic_expand_more</item>
+		<item name="chipIconVisible">true</item>
+	</style>
+
 	<style name="Widget.Kotatsu.Button.More" parent="Widget.Material3.Button.TextButton">
 		<item name="android:minWidth">48dp</item>
 	</style>

app/src/main/res/xml/pref_appearance.xml

@@ -48,12 +48,6 @@
 
 	<PreferenceCategory android:title="@string/details">
 
-		<SwitchPreferenceCompat
-			android:defaultValue="true"
-			android:key="reading_time"
-			android:summary="@string/reading_time_estimation_summary"
-			android:title="@string/reading_time_estimation" />
-
 		<ListPreference
 			android:defaultValue="0"
 			android:entries="@array/details_tabs"

app/src/main/res/xml/pref_services.xml

@@ -28,6 +28,18 @@
 		android:summary="@string/related_manga_summary"
 		android:title="@string/related_manga" />
 
+	<org.koitharu.kotatsu.settings.utils.SplitSwitchPreference
+		android:defaultValue="false"
+		android:key="stats_on"
+		android:title="@string/reading_stats"
+		app:allowDividerAbove="true" />
+
+	<SwitchPreferenceCompat
+		android:defaultValue="true"
+		android:key="reading_time"
+		android:summary="@string/reading_time_estimation_summary"
+		android:title="@string/reading_time_estimation" />
+
 	<PreferenceCategory android:title="@string/tracking">
 
 		<Preference

app/src/test/kotlin/org/koitharu/kotatsu/core/backup/JsonSerializerTest.kt

@@ -73,6 +73,7 @@ class JsonSerializerTest {
 			scroll = 24.0f,
 			percent = 0.6f,
 			deletedAt = 0L,
+			chaptersCount = 12,
 		)
 		val json = JsonSerializer(entity).toJson()
 		val result = JsonDeserializer(json).toHistoryEntity()