Library View: Add latest chapter sorting and revert last updated sorting changes

Latest chapter is as it sounds
Last update is now any changes to the chapter list (addition, removal, rename, etc.)

app/src/main/java/eu/kanade/tachiyomi/data/database/queries/MangaQueries.kt

@@ -113,6 +113,19 @@ interface MangaQueries : DbProvider {
                     .build())
             .prepare()
 
-    fun getTotalChapterManga() = db.get().listOfObjects(Manga::class.java)
-            .withQuery(RawQuery.builder().query(getTotalChapterMangaQuery()).observesTables(MangaTable.TABLE).build()).prepare();
+    fun getTotalChapterManga() = db.get()
+            .listOfObjects(Manga::class.java)
+            .withQuery(RawQuery.builder()
+                    .query(getTotalChapterMangaQuery())
+                    .observesTables(MangaTable.TABLE)
+                    .build())
+            .prepare()
+
+    fun getLatestChapterManga() = db.get()
+            .listOfObjects(Manga::class.java)
+            .withQuery(RawQuery.builder()
+                    .query(getLatestChapterMangaQuery())
+                    .observesTables(MangaTable.TABLE)
+                    .build())
+            .prepare()
 }

app/src/main/java/eu/kanade/tachiyomi/data/database/queries/RawQueries.kt

@@ -102,6 +102,15 @@ fun getTotalChapterMangaQuery()= """
     ORDER by COUNT(*)
 """
 
+fun getLatestChapterMangaQuery()= """
+    SELECT ${Manga.TABLE}.*, MAX(${Chapter.TABLE}.${Chapter.COL_DATE_UPLOAD}) AS max
+    FROM ${Manga.TABLE}
+    JOIN ${Chapter.TABLE}
+    ON ${Manga.TABLE}.${Manga.COL_ID} = ${Chapter.TABLE}.${Chapter.COL_MANGA_ID}
+    GROUP BY ${Manga.TABLE}.${Manga.COL_ID}
+    ORDER by max DESC
+"""
+
 /**
  * Query to get the categories for a manga.
  */

app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryNavigationView.kt

@@ -117,7 +117,9 @@ class LibraryNavigationView @JvmOverloads constructor(context: Context, attrs: A
 
         private val source = Item.MultiSort(R.string.manga_info_source_label, this)
 
-        override val items = listOf(alphabetically, lastRead, lastUpdated, unread, total, source)
+        private val latestChapter = Item.MultiSort(R.string.manga_info_last_chapter_label, this)
+
+        override val items = listOf(alphabetically, lastRead, lastUpdated, unread, total, source, latestChapter)
 
         override val header = Item.Header(R.string.action_sort)
 
@@ -134,6 +136,7 @@ class LibraryNavigationView @JvmOverloads constructor(context: Context, attrs: A
             unread.state = if (sorting == LibrarySort.UNREAD) order else SORT_NONE
             total.state = if (sorting == LibrarySort.TOTAL) order else SORT_NONE
             source.state = if (sorting == LibrarySort.SOURCE) order else SORT_NONE
+            latestChapter.state = if (sorting == LibrarySort.LATEST_CHAPTER) order else SORT_NONE
         }
 
         override fun onItemClicked(item: Item) {
@@ -155,6 +158,7 @@ class LibraryNavigationView @JvmOverloads constructor(context: Context, attrs: A
                 unread -> LibrarySort.UNREAD
                 total -> LibrarySort.TOTAL
                 source -> LibrarySort.SOURCE
+                latestChapter -> LibrarySort.LATEST_CHAPTER
                 else -> throw Exception("Unknown sorting")
             })
             preferences.librarySortingAscending().set(if (item.state == SORT_ASC) true else false)

app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryPresenter.kt

@@ -185,6 +185,10 @@ class LibraryPresenter(
             var counter = 0
             db.getTotalChapterManga().executeAsBlocking().associate { it.id!! to counter++ }
         }
+        val latestChapterManga by lazy {
+            var counter = 0
+            db.getLatestChapterManga().executeAsBlocking().associate { it.id!! to counter++ }
+        }
 
         val sortFn: (LibraryItem, LibraryItem) -> Int = { i1, i2 ->
             when (sortingMode) {
@@ -207,6 +211,11 @@ class LibraryPresenter(
                     val source2Name = sourceManager.getOrStub(i2.manga.source).name
                     source1Name.compareTo(source2Name)
                 }
+                LibrarySort.LATEST_CHAPTER -> {
+                    val manga1latestChapter = latestChapterManga[i1.manga.id!!] ?: 0
+                    val manga2latestChapter = latestChapterManga[i2.manga.id!!] ?: 0
+                    manga1latestChapter.compareTo(manga2latestChapter)
+                }
                 else -> throw Exception("Unknown sorting mode")
             }
         }

app/src/main/java/eu/kanade/tachiyomi/ui/library/LibrarySort.kt

@@ -8,4 +8,5 @@ object LibrarySort {
     const val UNREAD = 3
     const val TOTAL = 4
     const val SOURCE = 5
+    const val LATEST_CHAPTER = 6
 }

app/src/main/java/eu/kanade/tachiyomi/util/chapter/ChapterSourceSync.kt

@@ -129,9 +129,8 @@ fun syncChaptersWithSource(db: DatabaseHelper,
         // Fix order in source.
         db.fixChaptersSourceOrder(sourceChapters).executeAsBlocking()
 
-        // Set manga's last update time to latest chapter's upload time if possible
-        val newestChapter = db.getChapters(manga).executeAsBlocking().maxBy { it.date_upload }
-        manga.last_update = newestChapter?.date_upload ?: manga.last_update
+        // Set this manga as updated since chapters were changed
+        manga.last_update = Date().time
         db.updateLastUpdated(manga).executeAsBlocking()
     }