Ability to delete reading history (#3871)

* Added ability to delete history for all manga

* Fix review comments

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsAdvancedController.kt

@@ -95,6 +95,16 @@ class SettingsAdvancedController : SettingsController() {
                     ctrl.showDialog(router)
                 }
             }
+            preference {
+                titleRes = R.string.pref_clear_history
+                summaryRes = R.string.pref_clear_history_summary
+
+                onClick {
+                    val ctrl = ClearHistoryDialogController()
+                    ctrl.targetController = this@SettingsAdvancedController
+                    ctrl.showDialog(router)
+                }
+            }
         }
 
         preferenceCategory {
@@ -172,6 +182,22 @@ class SettingsAdvancedController : SettingsController() {
         }
     }
 
+    class ClearHistoryDialogController : DialogController() {
+        override fun onCreateDialog(savedViewState: Bundle?): Dialog {
+            return MaterialDialog(activity!!)
+                .message(R.string.clear_history_confirmation)
+                .positiveButton(android.R.string.ok) {
+                    (targetController as? SettingsAdvancedController)?.clearHistory()
+                }
+                .negativeButton(android.R.string.cancel)
+        }
+    }
+
+    private fun clearHistory() {
+        db.deleteHistory().executeAsBlocking()
+        activity?.toast(R.string.clear_history_completed)
+    }
+
     private fun clearDatabase() {
         db.deleteMangasNotInLibrary().executeAsBlocking()
         db.deleteHistoryNoLastRead().executeAsBlocking()

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

@@ -402,6 +402,10 @@
     <string name="pref_disable_battery_optimization_summary">Helps with background library updates and backups</string>
     <string name="battery_optimization_disabled">Battery optimization is already disabled</string>
     <string name="battery_optimization_setting_activity_not_found">Couldn\'t open device settings</string>
+    <string name="clear_history_completed">History deleted</string>
+    <string name="clear_history_confirmation">Are you sure? All history will be lost.</string>
+    <string name="pref_clear_history">Clear history</string>
+    <string name="pref_clear_history_summary">Delete reading history for all manga</string>
 
       <!-- About section -->
     <string name="website">Website</string>