import 'package:flutter/material.dart';
import 'package:flutter/cupertino.dart';
import 'package:git_touch/models/theme.dart';
import 'package:git_touch/scaffolds/common.dart';
import 'package:git_touch/widgets/issue_item.dart';
import 'package:git_touch/widgets/loading.dart';
import 'package:git_touch/widgets/user_item.dart';
import 'package:primer/primer.dart';
import 'package:provider/provider.dart';
import 'package:git_touch/models/auth.dart';
import '../utils/utils.dart';
import 'package:git_touch/widgets/repository_item.dart';

class SearchScreen extends StatefulWidget {
  @override
  _SearchScreenState createState() => _SearchScreenState();
}

class _SearchScreenState extends State<SearchScreen> {
  int _activeTab = 0;
  bool _loading = false;
  List<List> _payloads = [[], [], []];

  TextEditingController _controller;

  String get _keyword => _controller.text?.trim() ?? '';

  @override
  void initState() {
    super.initState();
    _controller = TextEditingController();
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  Future<void> _query() async {
    if (_loading || _keyword.isEmpty) return;

    var keyword = _controller.text;
    setState(() {
      _loading = true;
    });
    try {
      var data = await Provider.of<AuthModel>(context).query('''
{
  repository: search(first: $pageSize, type: REPOSITORY, query: "$keyword") {
    nodes {
      ... on Repository {
        owner {
          __typename
          login
          avatarUrl
        }
        name
        description
        isPrivate
        isFork
        stargazers {
          totalCount
        }
        forks {
          totalCount
        }
        primaryLanguage {
          color
          name
        }
      }
    }
  }
  user: search(first: $pageSize, type: USER, query: "$keyword") {
    nodes {
      ... on Organization {
        __typename
        name
        avatarUrl
        bio: description
        login
      }
      ... on User {
        $userGqlChunk
      }
    }
  }
  issue: search(first: $pageSize, type: ISSUE, query: "$keyword") {
    nodes {
      ... on PullRequest {
        __typename
        $issueGqlChunk
      }
      ... on Issue {
        $issueGqlChunk
      }
    }
  }
}
        ''');
      _payloads[0] = data['repository']['nodes'];
      _payloads[1] = data['user']['nodes'];
      _payloads[2] = data['issue']['nodes'];
    } finally {
      setState(() {
        _loading = false;
      });
    }
  }

  Widget _buildInput() {
    switch (Provider.of<ThemeModel>(context).theme) {
      case AppThemeType.cupertino:
        return Container(
          color: Colors.white,
          child: CupertinoTextField(
            prefix: Row(
              children: <Widget>[
                SizedBox(width: 8),
                Icon(Octicons.search, size: 20, color: PrimerColors.gray400),
              ],
            ),
            placeholder: 'Search',
            clearButtonMode: OverlayVisibilityMode.editing,
            textInputAction: TextInputAction.go,
            onSubmitted: (_) => _query(),
            controller: _controller,
          ),
        );
      default:
        return TextField(
          decoration: InputDecoration.collapsed(hintText: 'Search'),
          textInputAction: TextInputAction.go,
          onSubmitted: (_) => _query(),
          controller: _controller,
        );
    }
  }

  _onTabSwitch(int index) {
    setState(() {
      _activeTab = index;
    });
    if (_payloads[_activeTab].isEmpty) {
      _query();
    }
  }

  static const tabs = ['Repositories', 'Users', 'Issues'];

  static IconData _buildIconData(p) {
    if (p['isPrivate']) {
      return Octicons.lock;
    }
    if (p['isFork']) {
      return Octicons.repo_forked;
    }
    return Octicons.repo;
  }

  Widget _buildItem(p) {
    switch (_activeTab) {
      case 0:
        return RepositoryItem(
          p['owner']['login'],
          p['owner']['avatarUrl'],
          p['name'],
          p['description'],
          _buildIconData(p),
          p['stargazers']['totalCount'],
          p['forks']['totalCount'],
          p['primaryLanguage'] == null ? null : p['primaryLanguage']['name'],
          p['primaryLanguage'] == null ? null : p['primaryLanguage']['color'],
        );
      case 1:
        return UserItem(
          login: p['login'],
          name: p['name'],
          avatarUrl: p['avatarUrl'],
          bio: Text(p['bio'] ?? ''),
        );
      case 2:
      default:
        return IssueItem(
            payload: p, isPullRequest: p['__typename'] == 'PullRequest');
    }
  }

  @override
  Widget build(BuildContext context) {
    final theme = Provider.of<ThemeModel>(context).theme;

    final scaffold = CommonScaffold(
      title: _buildInput(),
      body: SingleChildScrollView(
        child: Column(
          children: [
            if (theme == AppThemeType.cupertino)
              Center(
                child: Padding(
                  padding: EdgeInsets.symmetric(vertical: 8),
                  child: CupertinoSlidingSegmentedControl(
                    groupValue: _activeTab,
                    onValueChanged: _onTabSwitch,
                    children: tabs.asMap().map((key, text) => MapEntry(
                        key,
                        Padding(
                          padding: const EdgeInsets.symmetric(horizontal: 8),
                          child: Text(text, style: TextStyle(fontSize: 14)),
                        ))),
                  ),
                ),
              ),
            if (_loading)
              Loading()
            else
              ..._payloads[_activeTab].map(_buildItem).toList(),
          ],
        ),
      ),
      bottom: TabBar(
        onTap: _onTabSwitch,
        tabs: tabs.map((text) => Tab(text: text.toUpperCase())).toList(),
      ),
    );

    if (theme == AppThemeType.material) {
      return DefaultTabController(
        length: tabs.length,
        child: scaffold,
      );
    } else {
      return scaffold;
    }
  }
}