// ignore_for_file: implementation_imports

import 'dart:async';
import 'dart:convert';

import 'package:flutter/material.dart';

import 'package:async/src/result/result.dart' as result;
import 'package:collection/collection.dart';
import 'package:get_storage/get_storage.dart';
import 'package:go_router/go_router.dart';
import 'package:matrix/matrix.dart';

import 'package:fluffychat/l10n/l10n.dart';
import 'package:fluffychat/pangea/common/constants/local.key.dart';
import 'package:fluffychat/pangea/common/controllers/pangea_controller.dart';
import 'package:fluffychat/pangea/common/utils/error_handler.dart';
import 'package:fluffychat/pangea/common/utils/firebase_analytics.dart';
import 'package:fluffychat/widgets/future_loading_dialog.dart';
import 'package:fluffychat/widgets/matrix.dart';
import '../../bot/widgets/bot_face_svg.dart';
import '../../common/controllers/base_controller.dart';

class ClassController extends BaseController {
  late PangeaController _pangeaController;
  static final GetStorage _classStorage = GetStorage('class_storage');

  ClassController(PangeaController pangeaController) : super() {
    _pangeaController = pangeaController;
  }

  Future<void> cacheSpaceCode(String code) async {
    if (code.isEmpty) return;
    await _classStorage.write(
      PLocalKey.cachedClassCodeToJoin,
      code,
    );
  }

  String? justInputtedCode() {
    return _classStorage.read(PLocalKey.justInputtedCode);
  }

  String? get cachedClassCode {
    return _classStorage.read(PLocalKey.cachedClassCodeToJoin);
  }

  String? get cachedAlias {
    return _classStorage.read(PLocalKey.cachedAliasToJoin);
  }

  Future<void> joinCachedSpaceCode(BuildContext context) async {
    final String? classCode = cachedClassCode;
    final String? alias = cachedAlias;

    if (classCode != null) {
      await joinClasswithCode(
        context,
        classCode,
      );

      await _classStorage.remove(
        PLocalKey.cachedClassCodeToJoin,
      );
    } else if (alias != null) {
      await joinCachedRoomAlias(alias, context);
      await _classStorage.remove(PLocalKey.cachedAliasToJoin);
    }
  }

  Future<void> joinCachedRoomAlias(
    String alias,
    BuildContext context,
  ) async {
    if (alias.isEmpty) {
      context.go("/rooms");
      return;
    }

    final client = Matrix.of(context).client;
    if (!client.isLogged()) {
      await _classStorage.write(PLocalKey.cachedAliasToJoin, alias);
      context.go("/home");
      return;
    }

    Room? room = client.getRoomByAlias(alias) ?? client.getRoomById(alias);
    if (room != null) {
      room.isSpace
          ? context.go("/rooms?spaceId=${room.id}")
          : context.go("/rooms/${room.id}");
      return;
    }

    final roomID = await client.joinRoom(alias);
    room = client.getRoomById(roomID);
    if (room == null) {
      await client.waitForRoomInSync(roomID);
      room = client.getRoomById(roomID);
      if (room == null) {
        context.go("/rooms");
        return;
      }
    }

    room.isSpace
        ? context.go("/rooms?spaceId=${room.id}")
        : context.go("/rooms/${room.id}");
  }

  Future<result.Result<String?>> joinClasswithCode(
    BuildContext context,
    String classCode, {
    String? notFoundError,
  }) async {
    final client = Matrix.of(context).client;
    final spaceID = await showFutureLoadingDialog<String?>(
      context: context,
      future: () async {
        await _classStorage.write(
          PLocalKey.justInputtedCode,
          classCode,
        );

        final knockResponse = await client.httpClient.post(
          Uri.parse(
            '${client.homeserver}/_synapse/client/pangea/v1/knock_with_code',
          ),
          headers: {
            'Content-Type': 'application/json',
            'Authorization': 'Bearer ${client.accessToken}',
          },
          body: jsonEncode({'access_code': classCode}),
        );

        if (knockResponse.statusCode == 429) {
          return "429";
        }
        if (knockResponse.statusCode != 200) {
          throw notFoundError ?? L10n.of(context).unableToFindRoom;
        }

        final knockResult = jsonDecode(knockResponse.body);
        final foundClasses = List<String>.from(knockResult['rooms']);
        final alreadyJoined = List<String>.from(knockResult['already_joined']);

        final bool inFoundClass = foundClasses.isNotEmpty &&
            _pangeaController.matrixState.client.rooms.any(
              (room) => room.id == foundClasses.first,
            );

        if (alreadyJoined.isNotEmpty || inFoundClass) {
          final room = client.getRoomById(alreadyJoined.first);
          if (!(room?.isSpace ?? true)) {
            context.go("/rooms/${alreadyJoined.first}");
          } else {
            context.go("/rooms?spaceId=${alreadyJoined.first}");
          }
          return null;
        }

        if (foundClasses.isEmpty) {
          throw notFoundError ?? L10n.of(context).unableToFindRoom;
        }

        final chosenClassId = foundClasses.first;
        return chosenClassId;
      },
    );

    if (spaceID.isError || spaceID.result == null) {
      return spaceID;
    }

    if (spaceID.result == "429") {
      await _showTooManyRequestsPopup(context);
      return result.Result.error(
        Exception(L10n.of(context).tooManyRequestsWarning),
        StackTrace.current,
      );
    }

    try {
      await client.joinRoomById(spaceID.result!);

      Room? room = client.getRoomById(spaceID.result!);
      if (room == null) {
        await _pangeaController.matrixState.client.waitForRoomInSync(
          spaceID.result!,
          join: true,
        );
        room = client.getRoomById(spaceID.result!);
        if (room == null) return spaceID;
      }

      GoogleAnalytics.joinClass(classCode);

      if (room.membership != Membership.join) {
        await room.client.waitForRoomInSync(room.id, join: true);
      }

      // Sometimes, the invite event comes through after the join event and
      // replaces it, so membership gets out of sync. In this case,
      // load the true value from the server.
      // Related github issue: https://github.com/pangeachat/client/issues/2098
      if (room.membership !=
          room
              .getParticipants()
              .firstWhereOrNull((u) => u.id == room?.client.userID)
              ?.membership) {
        await room.requestParticipants();
      }

      if (room.isSpace) {
        context.go("/rooms?spaceId=${room.id}");
      } else {
        context.go("/rooms/${room.id}");
      }
      return spaceID;
    } catch (e, s) {
      ErrorHandler.logError(
        e: e,
        s: s,
        data: {
          "classCode": classCode,
        },
      );
      return result.Result.error(e, s);
    }
  }

  Future<void> _showTooManyRequestsPopup(BuildContext context) async {
    await showDialog(
      context: context,
      builder: (BuildContext context) {
        return Dialog(
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(12.0),
          ),
          child: Padding(
            padding: const EdgeInsets.all(16.0),
            child: Column(
              mainAxisSize: MainAxisSize.min,
              children: [
                const BotFace(
                  width: 100,
                  expression: BotExpression.idle,
                ),
                const SizedBox(height: 16),
                Text(
                  // "Are you like me?",
                  L10n.of(context).areYouLikeMe,
                  style: Theme.of(context).textTheme.titleLarge,
                  textAlign: TextAlign.center,
                ),
                const SizedBox(height: 8),
                Text(
                  // "Too many attempts made. Please try again in 5 minutes.",
                  L10n.of(context).tryAgainLater,
                  style: Theme.of(context).textTheme.bodyMedium,
                  textAlign: TextAlign.center,
                ),
                const SizedBox(height: 16),
                TextButton(
                  onPressed: () {
                    Navigator.of(context).pop();
                  },
                  child: const Text("Close"),
                ),
              ],
            ),
          ),
        );
      },
    );
  }
}