import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:mangayomi/models/manga.dart';
import 'package:mangayomi/models/settings.dart';
import 'package:mangayomi/modules/library/providers/isar_providers.dart';
import 'package:mangayomi/modules/library/providers/library_filter_provider.dart';
import 'package:mangayomi/modules/library/providers/library_state_provider.dart';
import 'package:mangayomi/modules/library/widgets/library_gridview_widget.dart';
import 'package:mangayomi/modules/library/widgets/library_listview_widget.dart';
import 'package:mangayomi/modules/widgets/error_text.dart';
import 'package:mangayomi/modules/widgets/progress_center.dart';
import 'package:mangayomi/providers/l10n_providers.dart';
import 'package:mangayomi/services/library_updater.dart';

/// Displays the library body content for a given category (or uncategorized).
///
/// Uses [filteredLibraryMangaProvider] for cached, optimized filtering
/// instead of calling _filterAndSortManga inline (which was O(N*M) due to
/// per-chapter Isar queries).
class LibraryBody extends ConsumerWidget {
  final ItemType itemType;
  final int? categoryId;
  final bool withoutCategories;
  final int downloadFilterType;
  final int unreadFilterType;
  final int startedFilterType;
  final int bookmarkedFilterType;
  final bool reverse;
  final bool downloadedChapter;
  final bool continueReaderBtn;
  final bool localSource;
  final bool language;
  final DisplayType displayType;
  final Settings settings;
  final bool downloadedOnly;
  final String searchQuery;
  final bool ignoreFiltersOnSearch;

  const LibraryBody({
    super.key,
    required this.itemType,
    this.categoryId,
    this.withoutCategories = false,
    required this.downloadFilterType,
    required this.unreadFilterType,
    required this.startedFilterType,
    required this.bookmarkedFilterType,
    required this.reverse,
    required this.downloadedChapter,
    required this.continueReaderBtn,
    required this.localSource,
    required this.language,
    required this.displayType,
    required this.settings,
    required this.downloadedOnly,
    required this.searchQuery,
    required this.ignoreFiltersOnSearch,
  });

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final l10n = l10nLocalizations(context)!;
    final sortType = ref
        .watch(
          sortLibraryMangaStateProvider(itemType: itemType, settings: settings),
        )
        .index;
    final mangaIdsList = ref.watch(mangasListStateProvider);

    // Choose the right data stream based on whether this is a category tab
    final mangaStream = withoutCategories
        ? ref.watch(
            getAllMangaWithoutCategoriesStreamProvider(itemType: itemType),
          )
        : ref.watch(
            getAllMangaStreamProvider(
              categoryId: categoryId,
              itemType: itemType,
            ),
          );

    return mangaStream.when(
      data: (data) {
        // Use the cached filtering provider instead of inline filtering
        final entries = ref.watch(
          filteredLibraryMangaProvider(
            data: data,
            downloadFilterType: downloadFilterType,
            unreadFilterType: unreadFilterType,
            startedFilterType: startedFilterType,
            bookmarkedFilterType: bookmarkedFilterType,
            sortType: sortType ?? 0,
            downloadedOnly: downloadedOnly,
            searchQuery: searchQuery,
            ignoreFiltersOnSearch: ignoreFiltersOnSearch,
          ),
        );

        if (entries.isEmpty) {
          return Center(child: Text(l10n.empty_library));
        }

        final entriesManga = reverse ? entries.reversed.toList() : entries;
        return RefreshIndicator(
          onRefresh: () async {
            await updateLibrary(
              ref: ref,
              context: context,
              mangaList: data,
              itemType: itemType,
            );
          },
          child: displayType == DisplayType.list
              ? LibraryListViewWidget(
                  entriesManga: entriesManga,
                  continueReaderBtn: continueReaderBtn,
                  downloadedChapter: downloadedChapter,
                  language: language,
                  mangaIdsList: mangaIdsList,
                  localSource: localSource,
                )
              : LibraryGridViewWidget(
                  entriesManga: entriesManga,
                  isCoverOnlyGrid: !(displayType == DisplayType.compactGrid),
                  isComfortableGrid: displayType == DisplayType.comfortableGrid,
                  continueReaderBtn: continueReaderBtn,
                  downloadedChapter: downloadedChapter,
                  language: language,
                  mangaIdsList: mangaIdsList,
                  localSource: localSource,
                  itemType: itemType,
                ),
        );
      },
      error: (error, _) => ErrorText(error),
      loading: () => const ProgressCenter(),
    );
  }
}

/// Badge showing the number of items in a category tab.
///
/// Uses the cached filtering provider for consistent results without
/// re-running the filter logic.
class CategoryBadge extends ConsumerWidget {
  final ItemType itemType;
  final int categoryId;
  final int downloadFilterType;
  final int unreadFilterType;
  final int startedFilterType;
  final int bookmarkedFilterType;
  final Settings settings;
  final bool downloadedOnly;
  final String searchQuery;
  final bool ignoreFiltersOnSearch;

  const CategoryBadge({
    super.key,
    required this.itemType,
    required this.categoryId,
    required this.downloadFilterType,
    required this.unreadFilterType,
    required this.startedFilterType,
    required this.bookmarkedFilterType,
    required this.settings,
    required this.downloadedOnly,
    required this.searchQuery,
    required this.ignoreFiltersOnSearch,
  });

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final mangas = ref.watch(
      getAllMangaStreamProvider(categoryId: categoryId, itemType: itemType),
    );
    final sortType = ref
        .watch(
          sortLibraryMangaStateProvider(itemType: itemType, settings: settings),
        )
        .index;

    return mangas.when(
      data: (data) {
        final filtered = ref.watch(
          filteredLibraryMangaProvider(
            data: data,
            downloadFilterType: downloadFilterType,
            unreadFilterType: unreadFilterType,
            startedFilterType: startedFilterType,
            bookmarkedFilterType: bookmarkedFilterType,
            sortType: sortType ?? 0,
            downloadedOnly: downloadedOnly,
            searchQuery: searchQuery,
            ignoreFiltersOnSearch: ignoreFiltersOnSearch,
          ),
        );
        return CircleAvatar(
          backgroundColor: Theme.of(context).focusColor,
          radius: 8,
          child: Text(
            filtered.length.toString(),
            style: TextStyle(
              fontSize: 10,
              color: Theme.of(context).textTheme.bodySmall!.color,
            ),
          ),
        );
      },
      error: (error, _) => ErrorText(error),
      loading: () => const ProgressCenter(),
    );
  }
}