import 'dart:convert';
import 'package:filesize/filesize.dart';
import 'package:flutter/material.dart';
import 'package:flutter/cupertino.dart';
import 'package:git_touch/graphql/gh.dart';
import 'package:git_touch/models/auth.dart';
import 'package:git_touch/scaffolds/refresh_stateful.dart';
import 'package:git_touch/utils/utils.dart';
import 'package:git_touch/widgets/app_bar_title.dart';
import 'package:git_touch/widgets/entry_item.dart';
import 'package:git_touch/widgets/label.dart';
import 'package:git_touch/widgets/mutation_button.dart';

import 'package:git_touch/widgets/markdown_view.dart';
import 'package:git_touch/widgets/repo_header.dart';
import 'package:git_touch/widgets/table_view.dart';
import 'package:provider/provider.dart';
import 'package:git_touch/models/theme.dart';
import 'package:tuple/tuple.dart';
import 'package:git_touch/widgets/action_button.dart';

final repositoryRouter = RouterScreen('/:owner/:name', (context, params) {
  if (params['ref'] == null) {
    return RepositoryScreen(params['owner'].first, params['name'].first);
  } else {
    return RepositoryScreen(params['owner'].first, params['name'].first,
        branch: params['ref'].first);
  }
});

class RepositoryScreen extends StatelessWidget {
  final String owner;
  final String name;
  final String branch;

  RepositoryScreen(this.owner, this.name, {this.branch});

  Future<GhRepoRepository> _query(BuildContext context) async {
    var res = await Provider.of<AuthModel>(context).gqlClient.execute(
        GhRepoQuery(
            variables: GhRepoArguments(
                owner: owner,
                name: name,
                branchSpecified: branch != null,
                branch: branch ?? '')));
    return res.data.repository;
  }

  Future<String> _fetchReadme(BuildContext context) async {
    var data = await Provider.of<AuthModel>(context)
        .getWithCredentials('/repos/$owner/$name/readme');

    if (data['content'] == null) {
      return null;
    }

    var bits = base64.decode((data['content'] as String).replaceAll('\n', ''));
    var str = utf8.decode(bits);
    return str;
  }

  Widget _buildLanguages(BuildContext context, GhRepoRepository repo) {
    final theme = Provider.of<ThemeModel>(context);
    return Container(
      color: theme.palette.background,
      padding: CommonStyle.padding,
      height: 300,
      child: SingleChildScrollView(
        child: Table(children: [
          for (final edge in repo.languages.edges)
            TableRow(children: [
              Container(
                padding: CommonStyle.padding,
                child: Row(children: <Widget>[
                  Container(
                    width: 18,
                    height: 18,
                    decoration: BoxDecoration(
                      color: convertColor(edge.node.color),
                      shape: BoxShape.circle,
                    ),
                  ),
                  SizedBox(width: 8),
                  Text(
                    edge.node.name,
                    style: TextStyle(
                      color: theme.palette.text,
                      fontSize: 18,
                    ),
                  ),
                ]),
              ),
              Container(
                padding: CommonStyle.padding,
                child: Text(
                  '${(edge.size / repo.languages.totalSize * 100).toStringAsFixed(1)}%',
                  style: TextStyle(
                    color: theme.palette.secondaryText,
                    fontSize: 18,
                  ),
                ),
              ),
            ])
        ]),
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return RefreshStatefulScaffold<Tuple2<GhRepoRepository, String>>(
      title: AppBarTitle('Repository'),
      fetchData: () async {
        final rs = await Future.wait([
          _query(context),
          _fetchReadme(context),
        ]);
        return Tuple2(rs[0] as GhRepoRepository, rs[1] as String);
      },
      actionBuilder: (data, setState) {
        final repo = data.item1;
        return ActionButton(
          title: 'Repository Actions',
          items: [
            ActionItem(
              text: 'Projects(${repo.projects.totalCount})',
              url: repo.projectsUrl,
            ),
            ActionItem(
              text: 'Releases(${repo.releases.totalCount})',
              url: 'https://github.com/$owner/$name/releases',
            ),
            ...ActionItem.getUrlActions(repo.url),
          ],
        );
      },
      bodyBuilder: (data, setState) {
        final repo = data.item1;
        final readme = data.item2;
        final ref = branch == null ? repo.defaultBranchRef : repo.ref;

        final langWidth = MediaQuery.of(context).size.width -
            CommonStyle.padding.left -
            CommonStyle.padding.right -
            repo.languages.edges.length +
            1;

        final theme = Provider.of<ThemeModel>(context);
        final auth = Provider.of<AuthModel>(context);
        final license = repo.licenseInfo?.spdxId ?? repo.licenseInfo?.name;

        return Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: <Widget>[
            RepoHeader(
              avatarUrl: repo.owner.avatarUrl,
              avatarLink: '/${repo.owner.login}',
              name: repo.name,
              owner: repo.owner.login,
              description: repo.description,
              homepageUrl: repo.homepageUrl,
              actions: [
                MutationButton(
                  text: repo.viewerHasStarred ? 'Unstar' : 'Star',
                  onPressed: () async {
                    final res = await auth.gqlClient.execute(
                      GhStarQuery(
                        variables: GhStarArguments(
                          id: repo.id,
                          flag: !repo.viewerHasStarred,
                        ),
                      ),
                    );
                    setState(() {
                      repo.viewerHasStarred =
                          res.data.removeStar?.starrable?.viewerHasStarred ??
                              res.data.addStar.starrable.viewerHasStarred;
                    });
                  },
                ),
                // TODO:
                // SizedBox(width: 4),
                // MutationButton(
                //   text: repo.viewerSubscription ==
                //           GhRepoSubscriptionState.SUBSCRIBED
                //       ? 'Unwatch'
                //       : 'Watch',
                //   onPressed: () async {
                //     theme.showActions(
                //       context,
                //       GhWatchSubscriptionState.values.map((v) {
                //         return ActionItem(
                //           text: v.toString(),
                //           onTap: (_) async {
                //             final res = await auth.gqlClient.execute(
                //               GhWatchQuery(
                //                 variables: GhWatchArguments(
                //                   id: repo.id,
                //                   state:
                //                       GhWatchSubscriptionState.SUBSCRIBED,
                //                 ),
                //               ),
                //             );
                //             setState(() {
                //               final r = res.data.updateSubscription
                //                   .subscribable as GhWatchRepository;
                //               switch (r.viewerSubscription) {
                //                 case GhWatchSubscriptionState.IGNORED:
                //                   repo.viewerSubscription =
                //                       GhRepoSubscriptionState.IGNORED;
                //                   break;
                //                 case GhWatchSubscriptionState.SUBSCRIBED:
                //                   repo.viewerSubscription =
                //                       GhRepoSubscriptionState.SUBSCRIBED;
                //                   break;
                //                 case GhWatchSubscriptionState
                //                     .UNSUBSCRIBED:
                //                   repo.viewerSubscription =
                //                       GhRepoSubscriptionState
                //                           .UNSUBSCRIBED;
                //                   break;
                //               }
                //             });
                //           },
                //         );
                //       }).toList(),
                //     );
                //   },
                // ),
              ],
              trailings: <Widget>[
                if (repo.repositoryTopics.nodes.isNotEmpty)
                  // TODO: link
                  Wrap(
                    spacing: 4,
                    runSpacing: 4,
                    children: repo.repositoryTopics.nodes.map((node) {
                      return MyLabel(
                        name: node.topic.name,
                        // color: Colors.blue.shade50,
                        color: theme.palette.grayBackground,
                        textColor: theme.palette.primary,
                      );
                    }).toList(),
                  )
              ],
            ),
            CommonStyle.border,
            Row(
              children: <Widget>[
                EntryItem(
                  count: repo.watchers.totalCount,
                  text: 'Watchers',
                  url: '/$owner/$name/watchers',
                ),
                EntryItem(
                  count: repo.stargazers.totalCount,
                  text: 'Stars',
                  url: '/$owner/$name/stargazers',
                ),
                EntryItem(
                  count: repo.forks.totalCount,
                  text: 'Forks',
                  url: 'https://github.com/$owner/$name/network/members',
                ),
              ],
            ),
            if (repo.languages.edges.isNotEmpty) ...[
              CommonStyle.border,
              CupertinoButton(
                padding: EdgeInsets.zero,
                minSize: 0,
                onPressed: () {
                  showCupertinoModalPopup(
                    context: context,
                    builder: (context) => _buildLanguages(context, repo),
                  );
                },
                child: Container(
                  // color: theme.palette.background,
                  padding: CommonStyle.padding.copyWith(top: 8, bottom: 8),
                  child: ClipRRect(
                    borderRadius: BorderRadius.circular(5),
                    child: SizedBox(
                      height: 10,
                      child: Row(
                        children: join(
                          SizedBox(width: 1),
                          repo.languages.edges
                              .map((lang) => Container(
                                  color: convertColor(lang.node.color),
                                  width: langWidth *
                                      lang.size /
                                      repo.languages.totalSize))
                              .toList(),
                        ),
                      ),
                    ),
                  ),
                ),
              ),
            ],
            TableView(
              hasIcon: true,
              items: [
                if (ref != null)
                  TableViewItem(
                    leftIconData: Octicons.code,
                    text: Text(repo.primaryLanguage?.name ?? 'Code'),
                    rightWidget: Text(
                      (license == null ? '' : '$license • ') +
                          filesize(repo.diskUsage * 1000),
                    ),
                    url: '/$owner/$name/blob/${ref.name}',
                  ),
                if (repo.hasIssuesEnabled)
                  TableViewItem(
                    leftIconData: Octicons.issue_opened,
                    text: Text('Issues'),
                    rightWidget:
                        Text(numberFormat.format(repo.issues.totalCount)),
                    url: '/$owner/$name/issues',
                  ),
                TableViewItem(
                  leftIconData: Octicons.git_pull_request,
                  text: Text('Pull requests'),
                  rightWidget:
                      Text(numberFormat.format(repo.pullRequests.totalCount)),
                  url: '/$owner/$name/pulls',
                ),
                TableViewItem(
                  leftIconData: Octicons.history,
                  text: Text('Commits'),
                  rightWidget: Text((ref.target as GhRepoCommit)
                      .history
                      ?.totalCount
                      .toString()),
                  url: '/$owner/$name/commits',
                ),
                if (ref != null) ...[
                  if (repo.refs != null)
                    TableViewItem(
                      leftIconData: Octicons.git_branch,
                      text: Text('Branches'),
                      rightWidget: Text(ref.name +
                          ' • ' +
                          numberFormat.format(repo.refs.totalCount)),
                      onTap: () async {
                        final refs = repo.refs.nodes;
                        if (refs.length < 2) return;

                        await Provider.of<ThemeModel>(context).showPicker(
                          context,
                          PickerGroupItem(
                            value: ref.name,
                            items: refs
                                .map((b) => PickerItem(b.name, text: b.name))
                                .toList(),
                            onChange: (ref) {
                              if (ref != branch) {
                                Provider.of<ThemeModel>(context).push(
                                    context, '/$owner/$name?ref=$ref',
                                    replace: true);
                              }
                            },
                          ),
                        );
                      },
                    ),
                ],
              ],
            ),
            if (readme != null)
              Container(
                padding: CommonStyle.padding,
                color: theme.palette.background,
                child: MarkdownView(
                  readme,
                  basePaths: [owner, name, branch ?? 'master'], // TODO:
                ),
              ),
            CommonStyle.verticalGap,
          ],
        );
      },
    );
  }
}