Implement simple stats screen (#8068)

* Implement simple stats screen

* Review Changes

* Some other changes

* Remove unused

* Small changes

* Review Changes 2 + Cleanup

* Review Changes 3

* Cleanup leftovers

* Optimize imports

app/src/main/java/eu/kanade/tachiyomi/data/download/DownloadCache.kt

@@ -107,6 +107,19 @@ class DownloadCache(
         return false
     }
 
+    /**
+     * Returns the amount of downloaded chapters.
+     */
+    fun getTotalDownloadCount(): Int {
+        renewCache()
+
+        return rootDownloadsDir.sourceDirs.values.sumOf { sourceDir ->
+            sourceDir.mangaDirs.values.sumOf { mangaDir ->
+                mangaDir.chapterDirs.size
+            }
+        }
+    }
+
     /**
      * Returns the amount of downloaded chapters for a manga.
      *

app/src/main/java/eu/kanade/tachiyomi/data/download/DownloadManager.kt

@@ -205,6 +205,13 @@ class DownloadManager(
             .firstOrNull { it.chapter.id == chapter.id && it.chapter.manga_id == chapter.mangaId }
     }
 
+    /**
+     * Returns the amount of downloaded chapters.
+     */
+    fun getDownloadCount(): Int {
+        return cache.getTotalDownloadCount()
+    }
+
     /**
      * Returns the amount of downloaded chapters for a manga.
      *

app/src/main/java/eu/kanade/tachiyomi/data/track/TrackService.kt

@@ -24,6 +24,7 @@ import okhttp3.OkHttpClient
 import uy.kohesive.injekt.Injekt
 import uy.kohesive.injekt.api.get
 import uy.kohesive.injekt.injectLazy
+import eu.kanade.domain.track.model.Track as DomainTrack
 
 abstract class TrackService(val id: Long) {
 
@@ -59,6 +60,11 @@ abstract class TrackService(val id: Long) {
 
     abstract fun getScoreList(): List<String>
 
+    // TODO: Store all scores as 10 point in the future maybe?
+    open fun get10PointScore(track: DomainTrack): Float {
+        return track.score
+    }
+
     open fun indexToScore(index: Int): Float {
         return index.toFloat()
     }

app/src/main/java/eu/kanade/tachiyomi/data/track/anilist/Anilist.kt

@@ -11,6 +11,7 @@ import kotlinx.serialization.decodeFromString
 import kotlinx.serialization.encodeToString
 import kotlinx.serialization.json.Json
 import uy.kohesive.injekt.injectLazy
+import eu.kanade.domain.track.model.Track as DomainTrack
 
 class Anilist(private val context: Context, id: Long) : TrackService(id) {
 
@@ -94,6 +95,11 @@ class Anilist(private val context: Context, id: Long) : TrackService(id) {
         }
     }
 
+    override fun get10PointScore(track: DomainTrack): Float {
+        // Score is stored in 100 point format
+        return track.score / 10f
+    }
+
     override fun indexToScore(index: Int): Float {
         return when (scorePreference.get()) {
             // 10 point