import 'dart:async';

import 'package:aves/model/entry.dart';
import 'package:aves/model/filters/query.dart';
import 'package:aves/model/filters/trash.dart';
import 'package:aves/model/selection.dart';
import 'package:aves/model/settings/settings.dart';
import 'package:aves/model/source/collection_lens.dart';
import 'package:aves/widgets/collection/collection_grid.dart';
import 'package:aves/widgets/common/basic/insets.dart';
import 'package:aves/widgets/common/behaviour/double_back_pop.dart';
import 'package:aves/widgets/common/providers/media_query_data_provider.dart';
import 'package:aves/widgets/common/providers/query_provider.dart';
import 'package:aves/widgets/common/providers/selection_provider.dart';
import 'package:aves/widgets/drawer/app_drawer.dart';
import 'package:collection/collection.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

class CollectionPage extends StatefulWidget {
  static const routeName = '/collection';

  final CollectionLens collection;

  const CollectionPage({
    Key? key,
    required this.collection,
  }) : super(key: key);

  @override
  _CollectionPageState createState() => _CollectionPageState();
}

class _CollectionPageState extends State<CollectionPage> {
  final List<StreamSubscription> _subscriptions = [];

  CollectionLens get collection => widget.collection;

  @override
  void initState() {
    super.initState();
    _subscriptions.add(settings.updateStream.where((event) => event.key == Settings.enableBinKey).listen((_) {
      if (!settings.enableBin) {
        collection.removeFilter(TrashFilter.instance);
      }
    }));
  }

  @override
  void dispose() {
    _subscriptions
      ..forEach((sub) => sub.cancel())
      ..clear();
    collection.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final liveFilter = collection.filters.firstWhereOrNull((v) => v is QueryFilter && v.live) as QueryFilter?;
    return MediaQueryDataProvider(
      child: Scaffold(
        body: SelectionProvider<AvesEntry>(
          child: QueryProvider(
            initialQuery: liveFilter?.query,
            child: Builder(
              builder: (context) => WillPopScope(
                onWillPop: () {
                  final selection = context.read<Selection<AvesEntry>>();
                  if (selection.isSelecting) {
                    selection.browse();
                    return SynchronousFuture(false);
                  }
                  return SynchronousFuture(true);
                },
                child: DoubleBackPopScope(
                  child: GestureAreaProtectorStack(
                    child: SafeArea(
                      bottom: false,
                      child: ChangeNotifierProvider<CollectionLens>.value(
                        value: collection,
                        child: const CollectionGrid(
                          // key is expected by test driver
                          key: Key('collection-grid'),
                          settingsRouteKey: CollectionPage.routeName,
                        ),
                      ),
                    ),
                  ),
                ),
              ),
            ),
          ),
        ),
        drawer: AppDrawer(currentCollection: collection),
        resizeToAvoidBottomInset: false,
      ),
    );
  }
}