feat: video download

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/pages/download/controller.dart

@@ -0,0 +1,75 @@
+import 'dart:async';
+
+import 'package:PiliPlus/models_new/download/download_info.dart';
+import 'package:PiliPlus/services/download/download_service.dart';
+import 'package:get/get.dart';
+
+class DownloadPageController extends GetxController {
+  final _downloadService = Get.find<DownloadService>();
+  late final StreamSubscription _sub;
+  final pages = RxList<DownloadPageInfo>();
+  final flag = RxInt(0);
+
+  @override
+  void onInit() {
+    super.onInit();
+    _loadList();
+    _sub = _downloadService.downloaFlag.listen((_) {
+      _loadList();
+    });
+  }
+
+  @override
+  void onClose() {
+    _sub.cancel();
+    super.onClose();
+  }
+
+  Future<void> _loadList() async {
+    await _downloadService.waitForInitialization;
+    if (isClosed) return;
+    if (_downloadService.downloadList.isEmpty) {
+      pages.clear();
+      return;
+    }
+    final list = <DownloadPageInfo>[];
+    for (final entry in _downloadService.downloadList) {
+      final pageId = entry.pageId;
+      final page = list.firstWhereOrNull((e) => e.pageId == pageId);
+      if (page != null) {
+        final aSortKey = entry.sortKey;
+        if (!entry.isCompleted) {
+          if (page.entry case final lastEntry?) {
+            if (aSortKey < lastEntry.sortKey) {
+              page.entry = entry;
+            }
+          } else {
+            page.entry = entry;
+          }
+        }
+        final bSortKey = page.sortKey;
+        if (aSortKey < bSortKey) {
+          page
+            ..cover = entry.cover
+            ..sortKey = aSortKey;
+        }
+        page.entrys.add(entry);
+      } else {
+        list.add(
+          DownloadPageInfo(
+            pageId: pageId,
+            dirPath: entry.pageDirPath,
+            title: entry.title,
+            cover: entry.cover,
+            sortKey: entry.sortKey,
+            seasonType: entry.ep?.seasonType,
+            entrys: [entry],
+            entry: entry.isCompleted ? null : entry,
+          ),
+        );
+      }
+    }
+    pages.value = list;
+    flag.value++;
+  }
+}