import 'dart:async';

import 'package:auto_route/auto_route.dart';
import 'package:easy_localization/easy_localization.dart';
import 'package:flutter/material.dart';
import 'package:flutter_hooks/flutter_hooks.dart';
import 'package:hooks_riverpod/hooks_riverpod.dart';
import 'package:immich_mobile/modules/album/providers/album.provider.dart';
import 'package:immich_mobile/modules/home/ui/draggable_scrollbar.dart';
import 'package:immich_mobile/modules/login/providers/authentication.provider.dart';
import 'package:immich_mobile/modules/album/models/asset_selection_page_result.model.dart';
import 'package:immich_mobile/modules/album/providers/asset_selection.provider.dart';
import 'package:immich_mobile/modules/album/providers/shared_album.provider.dart';
import 'package:immich_mobile/modules/album/services/album.service.dart';
import 'package:immich_mobile/modules/album/ui/album_action_outlined_button.dart';
import 'package:immich_mobile/modules/album/ui/album_viewer_appbar.dart';
import 'package:immich_mobile/modules/album/ui/album_viewer_editable_title.dart';
import 'package:immich_mobile/modules/album/ui/album_viewer_thumbnail.dart';
import 'package:immich_mobile/modules/settings/providers/app_settings.provider.dart';
import 'package:immich_mobile/modules/settings/services/app_settings.service.dart';
import 'package:immich_mobile/routing/router.dart';
import 'package:immich_mobile/shared/models/album.dart';
import 'package:immich_mobile/shared/ui/immich_loading_indicator.dart';
import 'package:immich_mobile/shared/ui/immich_sliver_persistent_app_bar_delegate.dart';
import 'package:immich_mobile/shared/views/immich_loading_overlay.dart';

class AlbumViewerPage extends HookConsumerWidget {
  final String albumId;

  const AlbumViewerPage({Key? key, required this.albumId}) : super(key: key);

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    FocusNode titleFocusNode = useFocusNode();
    ScrollController scrollController = useScrollController();
    final album = ref.watch(sharedAlbumDetailProvider(albumId));

    final userId = ref.watch(authenticationProvider).userId;

    /// Find out if the assets in album exist on the device
    /// If they exist, add to selected asset state to show they are already selected.
    void onAddPhotosPressed(Album albumInfo) async {
      if (albumInfo.assets.isNotEmpty == true) {
        ref.watch(assetSelectionProvider.notifier).addNewAssets(
              albumInfo.assets,
            );
      }

      ref.watch(assetSelectionProvider.notifier).setIsAlbumExist(true);

      AssetSelectionPageResult? returnPayload = await AutoRouter.of(context)
          .push<AssetSelectionPageResult?>(const AssetSelectionRoute());

      if (returnPayload != null) {
        // Check if there is new assets add
        if (returnPayload.selectedAdditionalAsset.isNotEmpty) {
          ImmichLoadingOverlayController.appLoader.show();

          var addAssetsResult =
              await ref.watch(albumServiceProvider).addAdditionalAssetToAlbum(
                    returnPayload.selectedAdditionalAsset,
                    albumInfo,
                  );

          if (addAssetsResult != null &&
              addAssetsResult.successfullyAdded > 0) {
            ref.watch(albumProvider.notifier).getAllAlbums();
            ref.invalidate(sharedAlbumDetailProvider(albumId));
          }

          ImmichLoadingOverlayController.appLoader.hide();
        }

        ref.watch(assetSelectionProvider.notifier).removeAll();
      } else {
        ref.watch(assetSelectionProvider.notifier).removeAll();
      }
    }

    void onAddUsersPressed(Album album) async {
      List<String>? sharedUserIds =
          await AutoRouter.of(context).push<List<String>?>(
        SelectAdditionalUserForSharingRoute(album: album),
      );

      if (sharedUserIds != null) {
        ImmichLoadingOverlayController.appLoader.show();

        var isSuccess = await ref
            .watch(albumServiceProvider)
            .addAdditionalUserToAlbum(sharedUserIds, album);

        if (isSuccess) {
          ref.invalidate(sharedAlbumDetailProvider(albumId));
        }

        ImmichLoadingOverlayController.appLoader.hide();
      }
    }

    Widget buildTitle(Album album) {
      return Padding(
        padding: const EdgeInsets.only(left: 8, right: 8, top: 16),
        child: userId == album.ownerId
            ? AlbumViewerEditableTitle(
                album: album,
                titleFocusNode: titleFocusNode,
              )
            : Padding(
                padding: const EdgeInsets.only(left: 8.0),
                child: Text(
                  album.name,
                  style: const TextStyle(
                    fontSize: 24,
                    fontWeight: FontWeight.bold,
                  ),
                ),
              ),
      );
    }

    Widget buildAlbumDateRange(Album album) {
      final DateTime startDate = album.assets.first.fileCreatedAt;
      final DateTime endDate = album.assets.last.fileCreatedAt; //Need default.
      final String startDateText =
          (startDate.year == endDate.year ? DateFormat.MMMd() : DateFormat.yMMMd())
              .format(startDate);
      final String endDateText = DateFormat.yMMMd().format(endDate);

      return Padding(
        padding: EdgeInsets.only(
          left: 16.0,
          top: 8.0,
          bottom: album.shared ? 0.0 : 8.0,
        ),
        child: Text(
          "$startDateText - $endDateText",
          style: const TextStyle(
            fontSize: 14,
            fontWeight: FontWeight.bold,
            color: Colors.grey,
          ),
        ),
      );
    }

    Widget buildHeader(Album album) {
      return SliverToBoxAdapter(
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            buildTitle(album),
            if (album.assets.isNotEmpty == true) buildAlbumDateRange(album),
            if (album.shared)
              SizedBox(
                height: 60,
                child: ListView.builder(
                  padding: const EdgeInsets.only(left: 16),
                  scrollDirection: Axis.horizontal,
                  itemBuilder: ((context, index) {
                    return Padding(
                      padding: const EdgeInsets.only(right: 8.0),
                      child: CircleAvatar(
                        backgroundColor: Colors.grey[300],
                        radius: 18,
                        child: Padding(
                          padding: const EdgeInsets.all(2.0),
                          child: ClipRRect(
                            borderRadius: BorderRadius.circular(50.0),
                            child: Image.asset(
                              'assets/immich-logo-no-outline.png',
                            ),
                          ),
                        ),
                      ),
                    );
                  }),
                  itemCount: album.sharedUsers.length,
                ),
              )
          ],
        ),
      );
    }

    Widget buildImageGrid(Album album) {
      final appSettingService = ref.watch(appSettingsServiceProvider);
      final bool showStorageIndicator =
          appSettingService.getSetting(AppSettingsEnum.storageIndicator);

      if (album.assets.isNotEmpty) {
        return SliverPadding(
          padding: const EdgeInsets.only(top: 10.0),
          sliver: SliverGrid(
            gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
              crossAxisCount:
                  appSettingService.getSetting(AppSettingsEnum.tilesPerRow),
              crossAxisSpacing: 5.0,
              mainAxisSpacing: 5,
            ),
            delegate: SliverChildBuilderDelegate(
              (BuildContext context, int index) {
                return AlbumViewerThumbnail(
                  asset: album.assets[index],
                  assetList: album.assets,
                  showStorageIndicator: showStorageIndicator,
                );
              },
              childCount: album.assetCount,
            ),
          ),
        );
      }
      return const SliverToBoxAdapter();
    }

    Widget buildControlButton(Album album) {
      return Padding(
        padding: const EdgeInsets.only(left: 16.0, top: 8, bottom: 8),
        child: SizedBox(
          height: 40,
          child: ListView(
            scrollDirection: Axis.horizontal,
            children: [
              AlbumActionOutlinedButton(
                iconData: Icons.add_photo_alternate_outlined,
                onPressed: () => onAddPhotosPressed(album),
                labelText: "share_add_photos".tr(),
              ),
              if (userId == album.ownerId)
                AlbumActionOutlinedButton(
                  iconData: Icons.person_add_alt_rounded,
                  onPressed: () => onAddUsersPressed(album),
                  labelText: "album_viewer_page_share_add_users".tr(),
                ),
            ],
          ),
        ),
      );
    }

    Future<bool> onWillPop() async {
      final isMultiselectEnable = ref
          .read(assetSelectionProvider)
          .selectedAssetsInAlbumViewer
          .isNotEmpty;
      if (isMultiselectEnable) {
        ref.watch(assetSelectionProvider.notifier).removeAll();
        return false;
      }

      return true;
    }

    Widget buildBody(Album album) {
      return WillPopScope(
        onWillPop: onWillPop,
        child: GestureDetector(
          onTap: () {
            titleFocusNode.unfocus();
          },
          child: DraggableScrollbar.semicircle(
            backgroundColor: Theme.of(context).hintColor,
            controller: scrollController,
            heightScrollThumb: 48.0,
            child: CustomScrollView(
              controller: scrollController,
              slivers: [
                buildHeader(album),
                SliverPersistentHeader(
                  pinned: true,
                  delegate: ImmichSliverPersistentAppBarDelegate(
                    minHeight: 50,
                    maxHeight: 50,
                    child: Container(
                      color: Theme.of(context).scaffoldBackgroundColor,
                      child: buildControlButton(album),
                    ),
                  ),
                ),
                buildImageGrid(album)
              ],
            ),
          ),
        ),
      );
    }

    return Scaffold(
      appBar: album.when(
        data: (Album? data) {
          if (data != null) {
            return AlbumViewerAppbar(
              album: data,
              userId: userId,
            );
          }
          return null;
        },
        error: (e, _) => null,
        loading: () => null,
      ),
      body: album.when(
        data: (albumInfo) => albumInfo != null
            ? buildBody(albumInfo)
            : const Center(
                child: CircularProgressIndicator(),
              ),
        error: (e, _) => Center(child: Text("Error loading album info $e")),
        loading: () => const Center(
          child: ImmichLoadingIndicator(),
        ),
      ),
    );
  }
}