Option to disable reading time estimator

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

@@ -403,6 +403,9 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 		get() = prefs.getString(KEY_BACKUP_PERIODICAL_OUTPUT, null)?.toUriOrNull()
 		set(value) = prefs.edit { putString(KEY_BACKUP_PERIODICAL_OUTPUT, value?.toString()) }
 
+	val isReadingTimeEstimationEnabled: Boolean
+		get() = prefs.getBoolean(KEY_READING_TIME, true)
+
 	fun isTipEnabled(tip: String): Boolean {
 		return prefs.getStringSet(KEY_TIPS_CLOSED, emptySet())?.contains(tip) != true
 	}
@@ -579,6 +582,7 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 		const val KEY_CF_GRAYSCALE = "cf_grayscale"
 		const val KEY_IGNORE_DOZE = "ignore_dose"
 		const val KEY_DETAILS_TAB = "details_tab"
+		const val KEY_READING_TIME = "reading_time"
 
 		// About
 		const val KEY_APP_UPDATE = "app_update"

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

@@ -2,14 +2,20 @@ package org.koitharu.kotatsu.details.domain
 
 import org.koitharu.kotatsu.core.model.MangaHistory
 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 javax.inject.Inject
 import kotlin.math.roundToInt
 
-class ReadingTimeUseCase @Inject constructor() {
+class ReadingTimeUseCase @Inject constructor(
+	private val settings: AppSettings,
+) {
 
 	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()) {

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

@@ -589,4 +589,6 @@
 	<string name="fullscreen_mode">Fullscreen mode</string>
 	<string name="reader_fullscreen_summary">Hide system status and navigation bars</string>
 	<string name="fraction_pattern">%1$d/%2$d</string>
+	<string name="reading_time_estimation">Show estimated reading time</string>
+	<string name="reading_time_estimation_summary">The time estimation value may be inaccurate</string>
 </resources>

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

@@ -49,6 +49,12 @@
 	<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"