import 'dart:convert';

import 'package:frosty/models/badges.dart';
import 'package:frosty/models/emotes.dart';
import 'package:http/http.dart';

/// The BTTV service for making API calls.
class BTTVApi {
  final Client _client;

  const BTTVApi(this._client);

  /// Returns a map of global BTTV emotes to their URL.
  Future<List<Emote>> getEmotesGlobal() async {
    final url = Uri.parse('https://api.betterttv.net/3/cached/emotes/global');

    final response = await _client.get(url);
    if (response.statusCode == 200) {
      final decoded = jsonDecode(response.body) as List;
      final emotes = decoded.map((emote) => EmoteBTTV.fromJson(emote)).toList();

      return emotes
          .map((emote) => Emote.fromBTTV(emote, EmoteType.bttvGlobal))
          .toList();
    } else {
      return Future.error('Failed to get BTTV global emotes');
    }
  }

  /// Returns a map of a channel's BTTV emotes to their URL.
  Future<List<Emote>> getEmotesChannel({required String id}) async {
    final url =
        Uri.parse('https://api.betterttv.net/3/cached/users/twitch/$id');

    final response = await _client.get(url);
    if (response.statusCode == 200) {
      final decoded = jsonDecode(response.body);
      final result = EmoteBTTVChannel.fromJson(decoded);

      final emoteToUrl = <Emote>[];
      emoteToUrl.addAll(
        result.channelEmotes
            .map((emote) => Emote.fromBTTV(emote, EmoteType.bttvChannel)),
      );
      emoteToUrl.addAll(
        result.sharedEmotes
            .map((emote) => Emote.fromBTTV(emote, EmoteType.bttvShared)),
      );

      return emoteToUrl;
    } else {
      return Future.error('Failed to get BTTV channel emotes');
    }
  }

  /// Returns a map of username to their BTTV badge.
  Future<Map<String, ChatBadge>> getBadges() async {
    final url = Uri.parse('https://api.betterttv.net/3/cached/badges');

    final response = await _client.get(url);
    if (response.statusCode == 200) {
      final badges = jsonDecode(response.body) as List;

      final badgeObjects =
          badges.map((badge) => BadgeInfoBTTV.fromJson(badge)).toList();

      return {
        for (final badge in badgeObjects)
          badge.providerId: ChatBadge.fromBTTV(badge),
      };
    } else {
      return Future.error('Failed to get BTTV badges');
    }
  }
}