import 'dart:async';

import 'package:famedlysdk/famedlysdk.dart';
import 'package:fluffychat/components/adaptive_page_layout.dart';
import 'package:fluffychat/components/avatar.dart';
import 'package:fluffychat/components/matrix.dart';
import 'package:fluffychat/i18n/i18n.dart';
import 'package:flutter/material.dart';

import 'chat_list.dart';

class InvitationSelection extends StatefulWidget {
  final Room room;
  const InvitationSelection(this.room, {Key key}) : super(key: key);

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

class _InvitationSelectionState extends State<InvitationSelection> {
  TextEditingController controller = TextEditingController();
  String currentSearchTerm;
  bool loading = false;
  List<Map<String, dynamic>> foundProfiles = [];
  Timer coolDown;

  Future<List<User>> getContacts(BuildContext context) async {
    final Client client = Matrix.of(context).client;
    List<User> participants = await widget.room.requestParticipants();
    List<User> contacts = [];
    Map<String, bool> userMap = {};
    for (int i = 0; i < client.rooms.length; i++) {
      List<User> roomUsers = client.rooms[i].getParticipants();
      for (int j = 0; j < roomUsers.length; j++) {
        if (userMap[roomUsers[j].id] != true &&
            participants.indexWhere((u) => u.id == roomUsers[j].id) == -1) {
          contacts.add(roomUsers[j]);
        }
        userMap[roomUsers[j].id] = true;
      }
    }
    contacts.sort((a, b) => a
        .calcDisplayname()
        .toLowerCase()
        .compareTo(b.calcDisplayname().toLowerCase()));
    return contacts;
  }

  void inviteAction(BuildContext context, String id) async {
    final success = await Matrix.of(context).tryRequestWithLoadingDialog(
      widget.room.invite(id),
    );
    if (success != false) {
      Scaffold.of(context).showSnackBar(
        SnackBar(
          content: Text(
            I18n.of(context).contactHasBeenInvitedToTheGroup,
          ),
        ),
      );
    }
  }

  void searchUserWithCoolDown(BuildContext context, String text) async {
    coolDown?.cancel();
    coolDown = Timer(
      Duration(seconds: 1),
      () => searchUser(context, text),
    );
  }

  void searchUser(BuildContext context, String text) async {
    coolDown?.cancel();
    if (text.isEmpty) {
      setState(() {
        foundProfiles = [];
      });
    }
    currentSearchTerm = text;
    if (currentSearchTerm.isEmpty) return;
    if (loading) return;
    setState(() => loading = true);
    final MatrixState matrix = Matrix.of(context);
    final response = await matrix.tryRequestWithErrorToast(
      matrix.client.jsonRequest(
          type: HTTPType.POST,
          action: "/client/r0/user_directory/search",
          data: {
            "search_term": text,
            "limit": 10,
          }),
    );
    setState(() => loading = false);
    if (response == false ||
        !(response is Map) ||
        (response["results"] == null)) return;
    setState(() {
      foundProfiles = List<Map<String, dynamic>>.from(response["results"]);
      if ("@$text".isValidMatrixId &&
          foundProfiles
                  .indexWhere((profile) => "@$text" == profile["user_id"]) ==
              -1) {
        setState(() => foundProfiles = [
              {"user_id": "@$text"}
            ]);
      }
      foundProfiles.removeWhere((profile) =>
          widget.room
              .getParticipants()
              .indexWhere((u) => u.id == profile["user_id"]) !=
          -1);
    });
  }

  @override
  Widget build(BuildContext context) {
    final String groupName = widget.room.name?.isEmpty ?? false
        ? I18n.of(context).group
        : widget.room.name;
    return AdaptivePageLayout(
      primaryPage: FocusPage.SECOND,
      firstScaffold: ChatList(activeChat: widget.room.id),
      secondScaffold: Scaffold(
          appBar: AppBar(
            title: Text(I18n.of(context).inviteContact),
            bottom: PreferredSize(
              preferredSize: Size.fromHeight(92),
              child: Padding(
                padding: const EdgeInsets.all(16.0),
                child: TextField(
                  controller: controller,
                  autofocus: true,
                  autocorrect: false,
                  textInputAction: TextInputAction.search,
                  onChanged: (String text) =>
                      searchUserWithCoolDown(context, text),
                  onSubmitted: (String text) => searchUser(context, text),
                  decoration: InputDecoration(
                    border: OutlineInputBorder(),
                    prefixText: "@",
                    hintText: I18n.of(context).username,
                    labelText: I18n.of(context).inviteContactToGroup(groupName),
                    suffixIcon: loading
                        ? Container(
                            padding: const EdgeInsets.all(8.0),
                            width: 12,
                            height: 12,
                            child: CircularProgressIndicator(),
                          )
                        : Icon(Icons.search),
                  ),
                ),
              ),
            ),
          ),
          body: foundProfiles.isNotEmpty
              ? ListView.builder(
                  itemCount: foundProfiles.length,
                  itemBuilder: (BuildContext context, int i) => ListTile(
                    leading: Avatar(
                      MxContent(foundProfiles[i]["avatar_url"] ?? ""),
                      foundProfiles[i]["display_name"] ??
                          foundProfiles[i]["user_id"],
                    ),
                    title: Text(
                      foundProfiles[i]["display_name"] ??
                          (foundProfiles[i]["user_id"] as String).localpart,
                    ),
                    subtitle: Text(foundProfiles[i]["user_id"]),
                    onTap: () =>
                        inviteAction(context, foundProfiles[i]["user_id"]),
                  ),
                )
              : FutureBuilder<List<User>>(
                  future: getContacts(context),
                  builder: (BuildContext context, snapshot) {
                    if (!snapshot.hasData) {
                      return Center(
                        child: CircularProgressIndicator(),
                      );
                    }
                    List<User> contacts = snapshot.data;
                    return ListView.builder(
                      itemCount: contacts.length,
                      itemBuilder: (BuildContext context, int i) => ListTile(
                        leading: Avatar(
                          contacts[i].avatarUrl,
                          contacts[i].calcDisplayname(),
                        ),
                        title: Text(contacts[i].calcDisplayname()),
                        subtitle: Text(contacts[i].id),
                        onTap: () => inviteAction(context, contacts[i].id),
                      ),
                    );
                  },
                )),
    );
  }
}