import 'dart:async';
import 'dart:io';

import 'package:famedlysdk/famedlysdk.dart';
import 'package:famedlysdk/matrix_api.dart';
import 'package:fluffychat/components/connection_status_header.dart';
import 'package:fluffychat/components/dialogs/simple_dialogs.dart';
import 'package:fluffychat/components/list_items/presence_list_item.dart';
import 'package:fluffychat/components/list_items/public_room_list_item.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:receive_sharing_intent/receive_sharing_intent.dart';
import 'package:share/share.dart';
import '../components/adaptive_page_layout.dart';
import '../components/list_items/chat_list_item.dart';
import '../components/matrix.dart';
import '../l10n/l10n.dart';
import '../utils/app_route.dart';
import '../utils/url_launcher.dart';
import 'archive.dart';
import 'homeserver_picker.dart';
import 'new_group.dart';
import 'new_private_chat.dart';
import 'settings.dart';

enum SelectMode { normal, share }

class ChatListView extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return AdaptivePageLayout(
      primaryPage: FocusPage.FIRST,
      firstScaffold: ChatList(),
      secondScaffold: Scaffold(
        body: Center(
          child: Image.asset('assets/logo.png', width: 100, height: 100),
        ),
      ),
    );
  }
}

class ChatList extends StatefulWidget {
  final String activeChat;

  const ChatList({this.activeChat, Key key}) : super(key: key);

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

class _ChatListState extends State<ChatList> {
  bool get searchMode => searchController.text?.isNotEmpty ?? false;
  final TextEditingController searchController = TextEditingController();
  final FocusNode _searchFocusNode = FocusNode();
  Timer coolDown;
  PublicRoomsResponse publicRoomsResponse;
  bool loadingPublicRooms = false;
  String searchServer;

  final ScrollController _scrollController = ScrollController();

  Future<void> waitForFirstSync(BuildContext context) async {
    var client = Matrix.of(context).client;
    if (client.prevBatch?.isEmpty ?? true) {
      await client.onFirstSync.stream.first;
    }
    return true;
  }

  bool _scrolledToTop = true;

  @override
  void initState() {
    _scrollController.addListener(() async {
      if (_scrollController.position.pixels > 0 && _scrolledToTop) {
        setState(() => _scrolledToTop = false);
      } else if (_scrollController.position.pixels == 0 && !_scrolledToTop) {
        setState(() => _scrolledToTop = true);
      }
    });
    searchController.addListener(() {
      coolDown?.cancel();
      if (searchController.text.isEmpty) {
        setState(() {
          loadingPublicRooms = false;
          publicRoomsResponse = null;
        });
        return;
      }
      coolDown = Timer(Duration(seconds: 1), () async {
        setState(() => loadingPublicRooms = true);
        final newPublicRoomsResponse =
            await SimpleDialogs(context).tryRequestWithErrorToast(
          Matrix.of(context).client.searchPublicRooms(
                limit: 30,
                includeAllNetworks: true,
                genericSearchTerm: searchController.text,
                server: searchServer,
              ),
        );
        setState(() {
          loadingPublicRooms = false;
          if (newPublicRoomsResponse != false) {
            publicRoomsResponse = newPublicRoomsResponse;
            if (searchController.text.isNotEmpty &&
                searchController.text.isValidMatrixId &&
                searchController.text.sigil == '#') {
              publicRoomsResponse.chunk.add(
                PublicRoom.fromJson({
                  'aliases': [searchController.text],
                  'name': searchController.text,
                  'room_id': searchController.text,
                }),
              );
            }
          }
        });
      });
      setState(() => null);
    });
    _initReceiveSharingINtent();
    super.initState();
  }

  StreamSubscription _intentDataStreamSubscription;

  StreamSubscription _intentFileStreamSubscription;

  void _processIncomingSharedFiles(List<SharedMediaFile> files) {
    if (files?.isEmpty ?? true) return;
    if (Navigator.of(context).canPop()) {
      Navigator.of(context).popUntil((r) => r.isFirst);
    }
    final file = File(files.first.path);

    Matrix.of(context).shareContent = {
      'msgtype': 'chat.fluffy.shared_file',
      'file': MatrixFile(
        bytes: file.readAsBytesSync(),
        name: file.path,
      ),
    };
  }

  void _processIncomingSharedText(String text) {
    if (text == null) return;
    if (Navigator.of(context).canPop()) {
      Navigator.of(context).popUntil((r) => r.isFirst);
    }
    if (text.startsWith('https://matrix.to/#/')) {
      UrlLauncher(context, text).openMatrixToUrl();
      return;
    }
    Matrix.of(context).shareContent = {
      'msgtype': 'm.text',
      'body': text,
    };
  }

  void _initReceiveSharingINtent() {
    if (kIsWeb) return;

    // For sharing images coming from outside the app while the app is in the memory
    _intentFileStreamSubscription = ReceiveSharingIntent.getMediaStream()
        .listen(_processIncomingSharedFiles, onError: print);

    // For sharing images coming from outside the app while the app is closed
    ReceiveSharingIntent.getInitialMedia().then(_processIncomingSharedFiles);

    // For sharing or opening urls/text coming from outside the app while the app is in the memory
    _intentDataStreamSubscription = ReceiveSharingIntent.getTextStream()
        .listen(_processIncomingSharedText, onError: print);

    // For sharing or opening urls/text coming from outside the app while the app is closed
    ReceiveSharingIntent.getInitialText().then(_processIncomingSharedText);
  }

  void _drawerTapAction(Widget view) {
    Navigator.of(context).pop();
    Navigator.of(context).pushAndRemoveUntil(
      AppRoute.defaultRoute(
        context,
        view,
      ),
      (r) => r.isFirst,
    );
  }

  void _setStatus(BuildContext context) async {
    Navigator.of(context).pop();
    final status = await SimpleDialogs(context).enterText(
      multiLine: true,
      titleText: L10n.of(context).setStatus,
      labelText: L10n.of(context).setStatus,
      hintText: L10n.of(context).statusExampleMessage,
    );
    if (status?.isEmpty ?? true) return;
    await SimpleDialogs(context).tryRequestWithLoadingDialog(
      Matrix.of(context).client.sendPresence(
          Matrix.of(context).client.userID, PresenceType.online,
          statusMsg: status),
    );
  }

  @override
  void dispose() {
    searchController.removeListener(
      () => setState(() => null),
    );
    _intentDataStreamSubscription?.cancel();
    _intentFileStreamSubscription?.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return StreamBuilder<LoginState>(
        stream: Matrix.of(context).client.onLoginStateChanged.stream,
        builder: (context, snapshot) {
          if (snapshot.data == LoginState.loggedOut) {
            Timer(Duration(seconds: 1), () {
              Matrix.of(context).clean();
              Navigator.of(context).pushAndRemoveUntil(
                  AppRoute.defaultRoute(context, HomeserverPicker()),
                  (r) => false);
            });
          }
          return StreamBuilder(
              stream: Matrix.of(context).onShareContentChanged.stream,
              builder: (context, snapshot) {
                final selectMode = Matrix.of(context).shareContent == null
                    ? SelectMode.normal
                    : SelectMode.share;
                return Scaffold(
                  drawer: selectMode == SelectMode.share
                      ? null
                      : Drawer(
                          child: SafeArea(
                            child: ListView(
                              padding: EdgeInsets.zero,
                              children: <Widget>[
                                ListTile(
                                  leading: Icon(Icons.edit),
                                  title: Text(L10n.of(context).setStatus),
                                  onTap: () => _setStatus(context),
                                ),
                                Divider(height: 1),
                                ListTile(
                                  leading: Icon(Icons.people_outline),
                                  title: Text(L10n.of(context).createNewGroup),
                                  onTap: () => _drawerTapAction(NewGroupView()),
                                ),
                                ListTile(
                                  leading: Icon(Icons.person_add),
                                  title: Text(L10n.of(context).newPrivateChat),
                                  onTap: () =>
                                      _drawerTapAction(NewPrivateChatView()),
                                ),
                                Divider(height: 1),
                                ListTile(
                                  leading: Icon(Icons.archive),
                                  title: Text(L10n.of(context).archive),
                                  onTap: () => _drawerTapAction(
                                    Archive(),
                                  ),
                                ),
                                ListTile(
                                  leading: Icon(Icons.settings),
                                  title: Text(L10n.of(context).settings),
                                  onTap: () => _drawerTapAction(
                                    SettingsView(),
                                  ),
                                ),
                                Divider(height: 1),
                                ListTile(
                                  leading: Icon(Icons.share),
                                  title: Text(L10n.of(context).inviteContact),
                                  onTap: () {
                                    Navigator.of(context).pop();
                                    Share.share(L10n.of(context).inviteText(
                                        Matrix.of(context).client.userID,
                                        'https://matrix.to/#/${Matrix.of(context).client.userID}'));
                                  },
                                ),
                              ],
                            ),
                          ),
                        ),
                  appBar: AppBar(
                    //elevation: _scrolledToTop ? 0 : null,
                    leading: selectMode != SelectMode.share
                        ? null
                        : IconButton(
                            icon: Icon(Icons.close),
                            onPressed: () =>
                                Matrix.of(context).shareContent = null,
                          ),
                    titleSpacing: 0,
                    title: selectMode == SelectMode.share
                        ? Text(L10n.of(context).share)
                        : Padding(
                            padding:
                                EdgeInsets.only(top: 8, bottom: 8, right: 8),
                            child: TextField(
                              autocorrect: false,
                              controller: searchController,
                              focusNode: _searchFocusNode,
                              decoration: InputDecoration(
                                contentPadding: EdgeInsets.all(9),
                                border: InputBorder.none,
                                hintText: L10n.of(context).searchForAChat,
                                suffixIcon: searchMode
                                    ? IconButton(
                                        icon: Icon(Icons.backspace),
                                        onPressed: () => setState(() {
                                          searchController.clear();
                                          _searchFocusNode.unfocus();
                                        }),
                                      )
                                    : null,
                              ),
                            ),
                          ),
                  ),
                  floatingActionButton:
                      (AdaptivePageLayout.columnMode(context) ||
                              selectMode == SelectMode.share)
                          ? null
                          : FloatingActionButton(
                              child: Icon(Icons.add),
                              backgroundColor: Theme.of(context).primaryColor,
                              onPressed: () => Navigator.of(context)
                                  .pushAndRemoveUntil(
                                      AppRoute.defaultRoute(
                                          context, NewPrivateChatView()),
                                      (r) => r.isFirst),
                            ),
                  body: StreamBuilder(
                      stream: Matrix.of(context)
                          .client
                          .onSync
                          .stream
                          .where((s) => s.hasRoomUpdate),
                      builder: (context, snapshot) {
                        return FutureBuilder<void>(
                          future: waitForFirstSync(context),
                          builder: (BuildContext context, snapshot) {
                            if (snapshot.hasData) {
                              var rooms = List<Room>.from(
                                  Matrix.of(context).client.rooms);
                              rooms.removeWhere((Room room) =>
                                  room.lastEvent == null ||
                                  (searchMode &&
                                      !room.displayname.toLowerCase().contains(
                                          searchController.text.toLowerCase() ??
                                              '')));
                              if (rooms.isEmpty &&
                                  (!searchMode ||
                                      publicRoomsResponse == null)) {
                                return Center(
                                  child: Column(
                                    mainAxisSize: MainAxisSize.min,
                                    children: <Widget>[
                                      Icon(
                                        searchMode
                                            ? Icons.search
                                            : Icons.chat_bubble_outline,
                                        size: 80,
                                        color: Colors.grey,
                                      ),
                                      Text(searchMode
                                          ? L10n.of(context).noRoomsFound
                                          : L10n.of(context)
                                              .startYourFirstChat),
                                    ],
                                  ),
                                );
                              }
                              final publicRoomsCount =
                                  (publicRoomsResponse?.chunk?.length ?? 0);
                              final totalCount =
                                  rooms.length + publicRoomsCount;
                              final directChats =
                                  rooms.where((r) => r.isDirectChat).toList();
                              final presences =
                                  Matrix.of(context).client.presences;
                              directChats.sort((a, b) =>
                                  presences[b.directChatMatrixID]
                                              ?.presence
                                              ?.statusMsg !=
                                          null
                                      ? 1
                                      : b.lastEvent.originServerTs.compareTo(
                                          a.lastEvent.originServerTs));
                              return ListView.separated(
                                  controller: _scrollController,
                                  separatorBuilder: (BuildContext context,
                                          int i) =>
                                      i == totalCount - publicRoomsCount
                                          ? ListTile(
                                              title: Text(
                                                L10n.of(context).publicRooms +
                                                    ':',
                                                style: TextStyle(
                                                  fontWeight: FontWeight.bold,
                                                  color: Theme.of(context)
                                                      .primaryColor,
                                                ),
                                              ),
                                            )
                                          : Container(),
                                  itemCount: totalCount + 1,
                                  itemBuilder: (BuildContext context, int i) {
                                    if (i == 0) {
                                      return Column(
                                        mainAxisSize: MainAxisSize.min,
                                        children: [
                                          ConnectionStatusHeader(),
                                          (directChats.isEmpty ||
                                                  selectMode ==
                                                      SelectMode.share)
                                              ? Container()
                                              : PreferredSize(
                                                  preferredSize:
                                                      Size.fromHeight(90),
                                                  child: Container(
                                                    height: 82,
                                                    child: ListView.builder(
                                                      scrollDirection:
                                                          Axis.horizontal,
                                                      itemCount:
                                                          directChats.length,
                                                      itemBuilder: (BuildContext
                                                                  context,
                                                              int i) =>
                                                          PresenceListItem(
                                                              directChats[i]),
                                                    ),
                                                  ),
                                                ),
                                        ],
                                      );
                                    }
                                    i--;
                                    return i < rooms.length
                                        ? ChatListItem(
                                            rooms[i],
                                            activeChat: widget.activeChat ==
                                                rooms[i].id,
                                          )
                                        : PublicRoomListItem(publicRoomsResponse
                                            .chunk[i - rooms.length]);
                                  });
                            } else {
                              return Center(
                                child: CircularProgressIndicator(),
                              );
                            }
                          },
                        );
                      }),
                );
              });
        });
  }
}