import 'dart:async';

import 'package:auto_route/auto_route.dart';
import 'package:easy_localization/easy_localization.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter_hooks/flutter_hooks.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'package:hooks_riverpod/hooks_riverpod.dart';
import 'package:immich_mobile/modules/album/providers/album.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/favorite/providers/favorite_provider.dart';
import 'package:immich_mobile/modules/home/providers/multiselect.provider.dart';
import 'package:immich_mobile/modules/home/ui/asset_grid/immich_asset_grid.dart';
import 'package:immich_mobile/modules/home/ui/control_bottom_app_bar.dart';
import 'package:immich_mobile/modules/home/ui/home_page_app_bar.dart';
import 'package:immich_mobile/modules/home/ui/profile_drawer/profile_drawer.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/models/asset.dart';
import 'package:immich_mobile/shared/providers/asset.provider.dart';
import 'package:immich_mobile/shared/providers/server_info.provider.dart';
import 'package:immich_mobile/shared/providers/websocket.provider.dart';
import 'package:immich_mobile/shared/services/share.service.dart';
import 'package:immich_mobile/shared/ui/immich_loading_indicator.dart';
import 'package:immich_mobile/shared/ui/immich_toast.dart';

class HomePage extends HookConsumerWidget {
  const HomePage({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final appSettingService = ref.watch(appSettingsServiceProvider);
    final multiselectEnabled = ref.watch(multiselectProvider.notifier);
    final selectionEnabledHook = useState(false);

    final selection = useState(<Asset>{});
    final albums = ref.watch(albumProvider).where((a) => a.isRemote).toList();
    final sharedAlbums = ref.watch(sharedAlbumProvider);
    final albumService = ref.watch(albumServiceProvider);

    final tipOneOpacity = useState(0.0);
    final refreshCount = useState(0);

    useEffect(
      () {
        ref.watch(websocketProvider.notifier).connect();
        ref.watch(assetProvider.notifier).getAllAsset();
        ref.watch(albumProvider.notifier).getAllAlbums();
        ref.watch(sharedAlbumProvider.notifier).getAllSharedAlbums();
        ref.watch(serverInfoProvider.notifier).getServerVersion();

        selectionEnabledHook.addListener(() {
          multiselectEnabled.state = selectionEnabledHook.value;
        });

        return () {
          // This does not work in tests
          if (kReleaseMode) {
            selectionEnabledHook.dispose();
          }
        };
      },
      [],
    );

    void reloadAllAsset() {
      ref.watch(assetProvider.notifier).getAllAsset();
    }

    Widget buildBody() {
      void selectionListener(
        bool multiselect,
        Set<Asset> selectedAssets,
      ) {
        selectionEnabledHook.value = multiselect;
        selection.value = selectedAssets;
      }

      void onShareAssets() {
        ref.watch(shareServiceProvider).shareAssets(selection.value.toList());
        selectionEnabledHook.value = false;
      }

      Iterable<Asset> remoteOnlySelection({String? localErrorMessage}) {
        final Set<Asset> assets = selection.value;
        final bool onlyRemote = assets.every((e) => e.isRemote);
        if (!onlyRemote) {
          if (localErrorMessage != null && localErrorMessage.isNotEmpty) {
            ImmichToast.show(
              context: context,
              msg: localErrorMessage,
              gravity: ToastGravity.BOTTOM,
            );
          }
          return assets.where((a) => a.isRemote);
        }
        return assets;
      }

      void onFavoriteAssets() {
        final remoteAssets = remoteOnlySelection(
          localErrorMessage: 'home_page_favorite_err_local'.tr(),
        );
        if (remoteAssets.isNotEmpty) {
          ref.watch(favoriteProvider.notifier).addToFavorites(remoteAssets);

          final assetOrAssets = remoteAssets.length > 1 ? 'assets' : 'asset';
          ImmichToast.show(
            context: context,
            msg: 'Added ${remoteAssets.length} $assetOrAssets to favorites',
            gravity: ToastGravity.BOTTOM,
          );
        }

        selectionEnabledHook.value = false;
      }

      void onDelete() {
        ref.watch(assetProvider.notifier).deleteAssets(selection.value);
        selectionEnabledHook.value = false;
      }

      void onAddToAlbum(Album album) async {
        final Iterable<Asset> assets = remoteOnlySelection(
          localErrorMessage: "home_page_add_to_album_err_local".tr(),
        );
        if (assets.isEmpty) {
          return;
        }
        final result = await albumService.addAdditionalAssetToAlbum(
          assets,
          album,
        );

        if (result != null) {
          if (result.alreadyInAlbum.isNotEmpty) {
            ImmichToast.show(
              context: context,
              msg: "home_page_add_to_album_conflicts".tr(
                namedArgs: {
                  "album": album.name,
                  "added": result.successfullyAdded.toString(),
                  "failed": result.alreadyInAlbum.length.toString()
                },
              ),
            );
          } else {
            ImmichToast.show(
              context: context,
              msg: "home_page_add_to_album_success".tr(
                namedArgs: {
                  "album": album.name,
                  "added": result.successfullyAdded.toString(),
                },
              ),
              toastType: ToastType.success,
            );
          }

          selectionEnabledHook.value = false;
        }
      }

      void onCreateNewAlbum() async {
        final Iterable<Asset> assets = remoteOnlySelection(
          localErrorMessage: "home_page_add_to_album_err_local".tr(),
        );
        if (assets.isEmpty) {
          return;
        }
        final result = await albumService.createAlbumWithGeneratedName(assets);

        if (result != null) {
          ref.watch(albumProvider.notifier).getAllAlbums();
          ref.watch(sharedAlbumProvider.notifier).getAllSharedAlbums();
          selectionEnabledHook.value = false;

          AutoRouter.of(context).push(AlbumViewerRoute(albumId: result.id));
        }
      }

      Future<void> refreshAssets() async {
        debugPrint("refreshCount.value ${refreshCount.value}");
        final fullRefresh = refreshCount.value > 0;
        await ref.read(assetProvider.notifier).getAllAsset(clear: fullRefresh);
        if (fullRefresh) {
          // refresh was forced: user requested another refresh within 2 seconds
          refreshCount.value = 0;
        } else {
          refreshCount.value++;
          // set counter back to 0 if user does not request refresh again
          Timer(const Duration(seconds: 2), () {
            refreshCount.value = 0;
          });
        }
      }

      buildLoadingIndicator() {
        Timer(const Duration(seconds: 2), () {
          tipOneOpacity.value = 1;
        });

        return Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              const ImmichLoadingIndicator(),
              Padding(
                padding: const EdgeInsets.only(top: 16.0),
                child: Text(
                  'home_page_building_timeline',
                  style: TextStyle(
                    fontWeight: FontWeight.w600,
                    fontSize: 16,
                    color: Theme.of(context).primaryColor,
                  ),
                ).tr(),
              ),
              AnimatedOpacity(
                duration: const Duration(milliseconds: 500),
                opacity: tipOneOpacity.value,
                child: SizedBox(
                  width: 250,
                  child: Padding(
                    padding: const EdgeInsets.only(top: 8.0),
                    child: const Text(
                      'home_page_first_time_notice',
                      textAlign: TextAlign.justify,
                      style: TextStyle(
                        fontSize: 12,
                      ),
                    ).tr(),
                  ),
                ),
              )
            ],
          ),
        );
      }

      return SafeArea(
        top: true,
        child: Stack(
          children: [
            ref.watch(assetProvider).renderList == null ||
                    ref.watch(assetProvider).allAssets.isEmpty
                ? buildLoadingIndicator()
                : ImmichAssetGrid(
                    renderList: ref.watch(assetProvider).renderList!,
                    assets: ref.watch(assetProvider).allAssets,
                    assetsPerRow: appSettingService
                        .getSetting(AppSettingsEnum.tilesPerRow),
                    showStorageIndicator: appSettingService
                        .getSetting(AppSettingsEnum.storageIndicator),
                    listener: selectionListener,
                    selectionActive: selectionEnabledHook.value,
                    onRefresh: refreshAssets,
                  ),
            if (selectionEnabledHook.value)
              SafeArea(
                bottom: true,
                child: ControlBottomAppBar(
                  onShare: onShareAssets,
                  onFavorite: onFavoriteAssets,
                  onDelete: onDelete,
                  onAddToAlbum: onAddToAlbum,
                  albums: albums,
                  sharedAlbums: sharedAlbums,
                  onCreateNewAlbum: onCreateNewAlbum,
                ),
              ),
          ],
        ),
      );
    }

    return Scaffold(
      appBar: HomePageAppBar(
        onPopBack: reloadAllAsset,
      ),
      drawer: const ProfileDrawer(),
      body: buildBody(),
    );
  }
}