import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:hiddingsel_app/appflow/model/represented_organisations.dart';
import 'package:hiddingsel_app/appflow/view/navigation_drawer.dart';
import '../../../constants/constant.dart';
import '../../controller/articles.dart';
import '../../model/articles.dart';
import '../further_pages/article.dart';
import '../widgets/card.dart';
import '../widgets/string_list.dart';

final List<RepresentedOrganisationModel> _organisations =
    RepresentedOrganisationModel.values;

class OrganisationView extends StatelessWidget {
  final RepresentedOrganisationModel _organisation;
  final Function(PreferredSizeWidget appBar, Widget body)? _onChange;

  OrganisationView(this._organisation, this._onChange, {Key? key})
      : super(key: key);

  @override
  Widget build(BuildContext context) => StreamBuilder(
        initialData: List<ArticleModel>.empty(),
        stream:
            ArticleController.getOrganisationArticleListStream(_organisation),
        builder: (context, AsyncSnapshot<List<ArticleModel>> snapshot) =>
            CustomScrollView(
          slivers: [
            SliverPersistentHeader(
              delegate: OrganisationSliver(_organisation),
              floating: true,
            ),
            SliverList(
              delegate: SliverChildBuilderDelegate(
                (context, index) => ArticleThumbnailView(
                    (snapshot.data ?? [])[index], _onChange),
                childCount: snapshot.data?.length ?? 0,
              ),
            )
          ],
        ),
      );
}

class OrganisationSliver extends SliverPersistentHeaderDelegate {

  final RepresentedOrganisationModel _organisation;
  OrganisationSliver(this._organisation, {Key? key});

  @override
  double get maxExtent => 550;

  @override
  double get minExtent => 550;

  @override
  bool shouldRebuild(covariant SliverPersistentHeaderDelegate oldDelegate) => true;

  @override
  Widget build(BuildContext context, double shrinkOffset, bool overlapsContent) =>
      Container(
        color: UIColors.white,
        child: ItemWithPersonAndText.fromOrganisation(_organisation),
      );
}

class OrganisationPagesView extends StatelessWidget with NavigationDrawerItem {
  @override
  String get title => 'Organisationen | Vereine';

  final RepresentedOrganisationModel _organisation;
  final Function(PreferredSizeWidget appBar, Widget body)? _onChange;

  OrganisationPagesView(this._organisation, this._onChange);

  Widget build(BuildContext context) => PageView.builder(
        controller:
            PageController(initialPage: _organisations.indexOf(_organisation)),
        itemCount: _organisations.length,
        itemBuilder: (context, index) =>
            OrganisationView(_organisations[index], _onChange),
      );
}

class OrganisationListView extends StatelessWidget with NavigationDrawerItem {
  @override
  String get title => 'Organisationen | Vereine';

  final Function(PreferredSizeWidget appBar, Widget body)? _onChange;

  OrganisationListView(this._onChange);

  @override
  Widget build(BuildContext context) => HiddingselMenu(
        _organisations.map((e) => OrganisationPagesView(e, _onChange)).toList(),
        _onChange,
        names: _organisations.map((e) => e.name).toList(),
        gradient: UIGradiants.yellow,
      );
}