// @dart=2.9

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:logging/logging.dart';
import 'package:photos/core/configuration.dart';
import 'package:photos/core/event_bus.dart';
import 'package:photos/db/files_db.dart';
import 'package:photos/ente_theme_data.dart';
import 'package:photos/events/subscription_purchased_event.dart';
import 'package:photos/models/collection.dart';
import 'package:photos/models/device_collection.dart';
import 'package:photos/models/gallery_type.dart';
import 'package:photos/models/magic_metadata.dart';
import 'package:photos/models/selected_files.dart';
import 'package:photos/services/collections_service.dart';
import 'package:photos/services/feature_flag_service.dart';
import 'package:photos/ui/common/dialogs.dart';
import 'package:photos/ui/common/rename_dialog.dart';
import 'package:photos/ui/sharing/share_collection_widget.dart';
import 'package:photos/utils/dialog_util.dart';
import 'package:photos/utils/magic_util.dart';
import 'package:photos/utils/toast_util.dart';

class GalleryAppBarWidget extends StatefulWidget {
  final GalleryType type;
  final String title;
  final SelectedFiles selectedFiles;
  final DeviceCollection deviceCollection;
  final Collection collection;

  const GalleryAppBarWidget(
    this.type,
    this.title,
    this.selectedFiles, {
    Key key,
    this.deviceCollection,
    this.collection,
  }) : super(key: key);

  @override
  State<GalleryAppBarWidget> createState() => _GalleryAppBarWidgetState();
}

class _GalleryAppBarWidgetState extends State<GalleryAppBarWidget> {
  final _logger = Logger("GalleryAppBar");
  StreamSubscription _userAuthEventSubscription;
  Function() _selectedFilesListener;
  String _appBarTitle;
  final GlobalKey shareButtonKey = GlobalKey();

  @override
  void initState() {
    _selectedFilesListener = () {
      setState(() {});
    };
    widget.selectedFiles.addListener(_selectedFilesListener);
    _userAuthEventSubscription =
        Bus.instance.on<SubscriptionPurchasedEvent>().listen((event) {
      setState(() {});
    });
    _appBarTitle = widget.title;
    super.initState();
  }

  @override
  void dispose() {
    _userAuthEventSubscription.cancel();
    widget.selectedFiles.removeListener(_selectedFilesListener);
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return widget.type == GalleryType.homepage
        ? const SizedBox.shrink()
        : AppBar(
            backgroundColor: widget.type == GalleryType.homepage
                ? const Color(0x00000000)
                : null,
            elevation: 0,
            centerTitle: false,
            title: widget.type == GalleryType.homepage
                ? const SizedBox.shrink()
                : TextButton(
                    child: Text(
                      _appBarTitle,
                      style: Theme.of(context)
                          .textTheme
                          .headline5
                          .copyWith(fontSize: 16),
                    ),
                    onPressed: () => _renameAlbum(context),
                  ),
            actions: _getDefaultActions(context),
          );
  }

  Future<dynamic> _renameAlbum(BuildContext context) async {
    if (widget.type != GalleryType.ownedCollection) {
      return;
    }
    final result = await showDialog<String>(
      context: context,
      builder: (BuildContext context) {
        return RenameDialog(_appBarTitle, 'Album');
      },
      barrierColor: Colors.black.withOpacity(0.85),
    );
    // indicates user cancelled the rename request
    if (result == null || result.trim() == _appBarTitle.trim()) {
      return;
    }

    final dialog = createProgressDialog(context, "Changing name...");
    await dialog.show();
    try {
      await CollectionsService.instance.rename(widget.collection, result);
      await dialog.hide();
      if (mounted) {
        _appBarTitle = result;
        setState(() {});
      }
    } catch (e) {
      await dialog.hide();
      showGenericErrorDialog(context);
    }
  }

  Future<dynamic> _leaveAlbum(BuildContext context) async {
    final DialogUserChoice result = await showChoiceDialog(
      context,
      "Leave shared album?",
      "You will leave the album, and it will stop being visible to you.",
      firstAction: "Cancel",
      secondAction: "Yes, Leave",
      secondActionColor:
          Theme.of(context).colorScheme.enteTheme.colorScheme.warning700,
    );
    if (result != DialogUserChoice.secondChoice) {
      return;
    }
    final dialog = createProgressDialog(context, "Leaving album...");
    await dialog.show();
    try {
      await CollectionsService.instance.leaveAlbum(widget.collection);
      await dialog.hide();
      if (mounted) {
        Navigator.of(context).pop();
      }
    } catch (e) {
      await dialog.hide();
      showGenericErrorDialog(context);
    }
  }

  List<Widget> _getDefaultActions(BuildContext context) {
    final List<Widget> actions = <Widget>[];
    if (Configuration.instance.hasConfiguredAccount() &&
        widget.selectedFiles.files.isEmpty &&
        widget.type == GalleryType.ownedCollection) {
      actions.add(
        Tooltip(
          message: "Share",
          child: IconButton(
            icon: Icon(Icons.adaptive.share),
            onPressed: () async {
              final bool showHiddenWarning =
                  await _shouldShowHiddenFilesWarning(widget.collection);
              if (showHiddenWarning) {
                final choice = await showChoiceDialog(
                  context,
                  'Share hidden items?',
                  "Looks like you're trying to share an album that has some hidden items.\n\nThese hidden items can be seen by the recipient.",
                  firstAction: "Cancel",
                  secondAction: "Share anyway",
                  secondActionColor:
                      Theme.of(context).colorScheme.defaultTextColor,
                );
                if (choice != DialogUserChoice.secondChoice) {
                  return;
                }
              }
              await _showShareCollectionDialog();
            },
          ),
        ),
      );
    }
    final List<PopupMenuItem> items = [];
    if (widget.type == GalleryType.ownedCollection) {
      if (widget.collection.type != CollectionType.favorites) {
        items.add(
          PopupMenuItem(
            value: 1,
            child: Row(
              children: const [
                Icon(Icons.edit),
                Padding(
                  padding: EdgeInsets.all(8),
                ),
                Text("Rename album"),
              ],
            ),
          ),
        );
      }
      final bool isArchived = widget.collection.isArchived();
      items.add(
        PopupMenuItem(
          value: 2,
          child: Row(
            children: [
              Icon(isArchived ? Icons.visibility : Icons.visibility_off),
              const Padding(
                padding: EdgeInsets.all(8),
              ),
              Text(isArchived ? "Unhide album" : "Hide album"),
            ],
          ),
        ),
      );
      if (widget.collection.type != CollectionType.favorites) {
        items.add(
          PopupMenuItem(
            value: 3,
            child: Row(
              children: const [
                Icon(Icons.delete_outline),
                Padding(
                  padding: EdgeInsets.all(8),
                ),
                Text("Delete album"),
              ],
            ),
          ),
        );
      }
    } // ownedCollection open ends

    if (widget.type == GalleryType.sharedCollection) {
      items.add(
        PopupMenuItem(
          value: 4,
          child: Row(
            children: const [
              Icon(Icons.logout),
              Padding(
                padding: EdgeInsets.all(8),
              ),
              Text("Leave album"),
            ],
          ),
        ),
      );
    }

    actions.add(
      PopupMenuButton(
        itemBuilder: (context) {
          return items;
        },
        onSelected: (value) async {
          if (value == 1) {
            await _renameAlbum(context);
          } else if (value == 2) {
            await changeCollectionVisibility(
              context,
              widget.collection,
              widget.collection.isArchived()
                  ? visibilityVisible
                  : visibilityArchive,
            );
          } else if (value == 3) {
            await _trashCollection();
          } else if (value == 4) {
            await _leaveAlbum(context);
          } else {
            showToast(context, "Something went wrong");
          }
        },
      ),
    );

    return actions;
  }

  Future<void> _trashCollection() async {
    final result = await showChoiceDialog(
      context,
      "Delete album?",
      "Files that are unique to this album "
          "will be moved to trash, and this album will be deleted.",
      firstAction: "Cancel",
      secondAction: "Delete album",
      secondActionColor: Colors.red,
    );
    if (result != DialogUserChoice.secondChoice) {
      return;
    }
    final dialog = createProgressDialog(
      context,
      "Please wait, deleting album",
    );
    await dialog.show();
    try {
      await CollectionsService.instance.trashCollection(widget.collection);

      showShortToast(context, "Successfully deleted album");
      await dialog.hide();
      Navigator.of(context).pop();
    } catch (e, s) {
      _logger.severe("failed to trash collection", e, s);
      await dialog.hide();
      showGenericErrorDialog(context);
      rethrow;
    }
  }

  Future<void> _showShareCollectionDialog() async {
    var collection = widget.collection;
    final dialog = createProgressDialog(context, "Please wait...");
    await dialog.show();
    try {
      if (collection == null || widget.type != GalleryType.ownedCollection) {
        throw Exception(
          "Cannot share empty collection of type ${widget.type}",
        );
      } else {
        final sharees =
            await CollectionsService.instance.getSharees(collection.id);
        collection = collection.copyWith(sharees: sharees);
      }
      await dialog.hide();
      return showDialog<void>(
        context: context,
        builder: (BuildContext context) {
          return SharingDialog(
            collection,
          );
        },
      );
    } catch (e, s) {
      _logger.severe(e, s);
      await dialog.hide();
      showGenericErrorDialog(context);
    }
  }

  Future<bool> _shouldShowHiddenFilesWarning(Collection collection) async {
    // collection can be null for device folders which are not marked for
    // back up
    if (!FeatureFlagService.instance.isInternalUserOrDebugBuild() ||
        collection == null) {
      return false;
    }
    // collection is already shared
    if (collection.sharees.isNotEmpty || collection.publicURLs.isNotEmpty) {
      return false;
    }
    final collectionIDsWithHiddenFiles =
        await FilesDB.instance.getCollectionIDsOfHiddenFiles(
      Configuration.instance.getUserID(),
    );
    return collectionIDsWithHiddenFiles.contains(collection.id);
  }
}