import 'dart:io';

import 'package:crypto/crypto.dart';
import 'package:freezer/api/cache.dart';
import 'package:freezer/api/definitions.dart';
import 'package:freezer/api/spotify.dart';
import 'package:freezer/settings.dart';
import 'package:http/http.dart' as http;
import 'package:logging/logging.dart';
import 'package:path/path.dart';

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

import 'package:path_provider/path_provider.dart';

final deezerAPI = DeezerAPI();

class DeezerAPI {
  static final _logger = Logger('DeezerAPI');
  DeezerAPI({this.arl});

  String? arl;
  String? token;
  String? userId;
  String? userName;
  String? favoritesPlaylistId;
  String? sid;

  Future<bool>? _authorizing;

  //Get headers
  Map<String, String> get headers => {
        "User-Agent":
            "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36",
        "Content-Language":
            '${settings.deezerLanguage}-${settings.deezerCountry}',
        "Cache-Control": "max-age=0",
        "Accept": "*/*",
        "Accept-Charset": "utf-8,ISO-8859-1;q=0.7,*;q=0.3",
        "Accept-Language":
            "${settings.deezerLanguage}-${settings.deezerCountry},${settings.deezerLanguage};q=0.9,en-US;q=0.8,en;q=0.7",
        "Connection": "keep-alive",
        "Cookie": "arl=$arl${(sid == null) ? '' : '; sid=$sid'}"
      };

  //Call private API
  Future<Map<dynamic, dynamic>> callApi(String method,
      {Map<dynamic, dynamic>? params, String? gatewayInput}) async {
    //Generate URL
    Uri uri = Uri.https('www.deezer.com', '/ajax/gw-light.php', {
      'api_version': '1.0',
      'api_token': token,
      'input': '3',
      'method': method,
      //Used for homepage
      if (gatewayInput != null) 'gateway_input': gatewayInput
    });
    //Post
    http.Response res =
        await http.post(uri, headers: headers, body: jsonEncode(params));
    dynamic body = jsonDecode(res.body);
    //Grab SID
    if (method == 'deezer.getUserData') {
      for (String cookieHeader in res.headers['set-cookie']!.split(';')) {
        if (cookieHeader.startsWith('sid=')) {
          sid = cookieHeader.split('=')[1];
        }
      }
    }
    // In case of error "Invalid CSRF token" retrieve new one and retry the same call
    if (body['error'].isNotEmpty &&
        body['error'].containsKey('VALID_TOKEN_REQUIRED') &&
        await rawAuthorize()) {
      return callApi(method, params: params, gatewayInput: gatewayInput);
    }
    return body;
  }

  Future<Map> callPublicApi(String path) async {
    Uri uri = Uri.https('api.deezer.com', '/$path');
    http.Response res = await http.get(uri);
    return jsonDecode(res.body);
  }

  //Wrapper so it can be globally awaited
  Future<bool> authorize() async => _authorizing ??= rawAuthorize();

  //Login with email
  static Future<String?> getArlByEmail(String? email, String password) async {
    //Get MD5 of password
    Digest digest = md5.convert(utf8.encode(password));
    String md5password = '$digest';
    //Get access token
    String url =
        "https://tv.deezer.com/smarttv/8caf9315c1740316053348a24d25afc7/user_auth.php?login=$email&password=$md5password&device=panasonic&output=json";
    http.Response response = await http.get(Uri.parse(url));
    String? accessToken = jsonDecode(response.body)["access_token"];
    //Get SID
    url = "https://api.deezer.com/platform/generic/track/42069";
    response = await http
        .get(Uri.parse(url), headers: {"Authorization": "Bearer $accessToken"});
    String? sid;
    for (String cookieHeader in response.headers['set-cookie']!.split(';')) {
      if (cookieHeader.startsWith('sid=')) {
        sid = cookieHeader.split('=')[1];
      }
    }
    if (sid == null) return null;
    //Get ARL
    url =
        "https://deezer.com/ajax/gw-light.php?api_version=1.0&api_token=null&input=3&method=user.getArl";
    response = await http.get(Uri.parse(url), headers: {"Cookie": "sid=$sid"});
    return jsonDecode(response.body)["results"];
  }

  //Authorize, bool = success
  Future<bool> rawAuthorize({Function? onError}) async {
    try {
      Map<dynamic, dynamic> data = await callApi('deezer.getUserData');
      if (data['results']['USER']['USER_ID'] == 0) {
        return false;
      } else {
        token = data['results']['checkForm'];
        userId = data['results']['USER']['USER_ID'].toString();
        userName = data['results']['USER']['BLOG_NAME'];
        favoritesPlaylistId = data['results']['USER']['LOVEDTRACKS_ID'];
        if (cache.favoritesPlaylistId != favoritesPlaylistId) {
          cache.favoritesPlaylistId = favoritesPlaylistId;
          await cache.save();
        }
        return true;
      }
    } catch (e) {
      if (onError != null) onError(e);
      _logger.warning('Login Error (D): $e');
      return false;
    }
  }

  //URL/Link parser
  Future<DeezerLinkResponse?> parseLink(String url) async {
    Uri uri = Uri.parse(url);
    //https://www.deezer.com/NOTHING_OR_COUNTRY/TYPE/ID
    if (uri.host == 'www.deezer.com' || uri.host == 'deezer.com') {
      if (uri.pathSegments.length < 2) return null;
      DeezerLinkType? type = DeezerLinkResponse.typeFromString(
          uri.pathSegments[uri.pathSegments.length - 2]);
      return DeezerLinkResponse(
          type: type, id: uri.pathSegments[uri.pathSegments.length - 1]);
    }
    //Share URL
    if (uri.host == 'deezer.page.link' || uri.host == 'www.deezer.page.link') {
      http.BaseRequest request = http.Request('HEAD', Uri.parse(url));
      request.followRedirects = false;
      http.StreamedResponse response = await request.send();
      String newUrl = response.headers['location']!;
      return parseLink(newUrl);
    }
    //Spotify
    if (uri.host == 'open.spotify.com') {
      if (uri.pathSegments.length < 2) return null;
      String spotifyUri = 'spotify:${uri.pathSegments.sublist(0, 2).join(':')}';
      try {
        //Tracks
        if (uri.pathSegments[0] == 'track') {
          String id = await SpotifyScrapper.convertTrack(spotifyUri);
          return DeezerLinkResponse(type: DeezerLinkType.TRACK, id: id);
        }
        //Albums
        if (uri.pathSegments[0] == 'album') {
          String id = await SpotifyScrapper.convertAlbum(spotifyUri);
          return DeezerLinkResponse(type: DeezerLinkType.ALBUM, id: id);
        }
      } catch (e) {
        // we don't care about errors apparently
      }
    }

    return null;
  }

  //Check if Deezer available in country
  static Future<bool?> chceckAvailability() async {
    try {
      http.Response res =
          await http.get(Uri.parse('https://api.deezer.com/infos'));
      return jsonDecode(res.body)["open"];
    } catch (e) {
      return null;
    }
  }

  //Search
  Future<SearchResults> search(String? query) async {
    Map<dynamic, dynamic> data = await callApi('deezer.pageSearch',
        params: {'nb': 128, 'query': query, 'start': 0});
    return SearchResults.fromPrivateJson(data['results']);
  }

  Future<Track> track(String? id) async {
    Map<dynamic, dynamic> data = await callApi('song.getListData', params: {
      'sng_ids': [id]
    });
    return Track.fromPrivateJson(data['results']['data'][0]);
  }

  //Get album details, tracks
  Future<Album> album(String? id) async {
    Map<dynamic, dynamic> data = await callApi('deezer.pageAlbum', params: {
      'alb_id': id,
      'header': true,
      'lang': settings.deezerLanguage
    });
    return Album.fromPrivateJson(data['results']['DATA'],
        songsJson: data['results']['SONGS']);
  }

  //Get artist details
  Future<Artist> artist(String? id) async {
    Map<dynamic, dynamic> data = await callApi('deezer.pageArtist', params: {
      'art_id': id,
      'lang': settings.deezerLanguage,
    });
    return Artist.fromPrivateJson(data['results']['DATA'],
        topJson: data['results']['TOP'],
        albumsJson: data['results']['ALBUMS'],
        highlight: data['results']['HIGHLIGHT']);
  }

  //Get playlist tracks at offset
  Future<List<Track>?> playlistTracksPage(String? id, int start,
      {int nb = 2000 /*was 50*/}) async {
    Map data = await callApi('deezer.pagePlaylist', params: {
      'playlist_id': id,
      'lang': settings.deezerLanguage,
      'nb': nb,
      'tags': true,
      'start': start
    });
    return data['results']['SONGS']['data']
        .map<Track>((json) => Track.fromPrivateJson(json))
        .toList();
  }

  //Get playlist details
  Future<Playlist> playlist(String? id, {int nb = 100}) async {
    Map<dynamic, dynamic> data = await callApi('deezer.pagePlaylist', params: {
      'playlist_id': id,
      'lang': settings.deezerLanguage,
      'nb': nb,
      'tags': true,
      'start': 0
    });
    return Playlist.fromPrivateJson(data['results']['DATA'],
        songsJson: data['results']['SONGS']);
  }

  //Get playlist with all tracks
  Future<Playlist> fullPlaylist(String? id) async {
    return await playlist(id, nb: 100000);
  }

  //Add track to favorites
  Future addFavoriteTrack(String id) async {
    await callApi('favorite_song.add', params: {'SNG_ID': id});
  }

  //Add album to favorites/library
  Future addFavoriteAlbum(String? id) async {
    await callApi('album.addFavorite', params: {'ALB_ID': id});
  }

  //Add artist to favorites/library
  Future addFavoriteArtist(String? id) async {
    await callApi('artist.addFavorite', params: {'ART_ID': id});
  }

  //Remove artist from favorites/library
  Future removeArtist(String? id) async {
    await callApi('artist.deleteFavorite', params: {'ART_ID': id});
  }

  // Mark track as disliked
  Future dislikeTrack(String id) async {
    await callApi('favorite_dislike.add', params: {'ID': id, 'TYPE': 'song'});
  }

  //Add tracks to playlist
  Future addToPlaylist(String trackId, String? playlistId,
      {int offset = -1}) async {
    await callApi('playlist.addSongs', params: {
      'offset': offset,
      'playlist_id': playlistId,
      'songs': [
        [trackId, 0]
      ]
    });
  }

  //Remove track from playlist
  Future removeFromPlaylist(String trackId, String? playlistId) async {
    await callApi('playlist.deleteSongs', params: {
      'playlist_id': playlistId,
      'songs': [
        [trackId, 0]
      ]
    });
  }

  //Get users playlists
  Future<List<Playlist>> getPlaylists() async {
    Map data = await callApi('deezer.pageProfile',
        params: {'nb': 100, 'tab': 'playlists', 'user_id': userId});
    return data['results']['TAB']['playlists']['data']
        .map<Playlist>((json) => Playlist.fromPrivateJson(json, library: true))
        .toList();
  }

  //Get favorite albums
  Future<List<Album>> getAlbums() async {
    Map data = await callApi('deezer.pageProfile',
        params: {'nb': 50, 'tab': 'albums', 'user_id': userId});
    List albumList = data['results']['TAB']['albums']['data'];
    List<Album> albums = albumList
        .map<Album>((json) => Album.fromPrivateJson(json, library: true))
        .toList();
    return albums;
  }

  //Remove album from library
  Future removeAlbum(String? id) async {
    await callApi('album.deleteFavorite', params: {'ALB_ID': id});
  }

  //Remove track from favorites
  Future removeFavorite(String id) async {
    await callApi('favorite_song.remove', params: {'SNG_ID': id});
  }

  //Get favorite artists
  Future<List<Artist>?> getArtists() async {
    Map data = await callApi('deezer.pageProfile',
        params: {'nb': 40, 'tab': 'artists', 'user_id': userId});
    return data['results']['TAB']['artists']['data']
        .map<Artist>((json) => Artist.fromPrivateJson(json, library: true))
        .toList();
  }

  //Get lyrics by track id
  Future<Lyrics> lyrics(String? trackId) async {
    Map data = await callApi('song.getLyrics', params: {'sng_id': trackId});
    if (data['error'] != null && data['error'].length > 0) {
      return Lyrics.error();
    }
    return Lyrics.fromPrivateJson(data['results']);
  }

  Future<SmartTrackList> smartTrackList(String? id) async {
    Map data = await callApi('deezer.pageSmartTracklist',
        params: {'smarttracklist_id': id});

    getExternalStorageDirectory().then((value) =>
        File(join(value!.path, 'test.json')).writeAsString(jsonEncode(data)));

    return SmartTrackList.fromPrivateJson(data['results'],
        songsJson: data['results']['SONGS']);
  }

  Future<List<Track>?> flow([String? config]) async {
    Map data = await callApi('radio.getUserRadio', params: {
      if (config != null) 'config_id': config,
      'user_id': userId,
    });
    return data['results']['data']
        ?.map<Track>((json) => Track.fromPrivateJson(json))
        .toList();
  }

  //Get homepage/music library from deezer
  Future<HomePage> homePage() async {
    List grid = [
      'album',
      'artist',
      'channel',
      'flow',
      'playlist',
      'radio',
      'show',
      'smarttracklist',
      'track',
      'user'
    ];
    Map data = await callApi('page.get',
        gatewayInput: jsonEncode({
          "PAGE": "home",
          "VERSION": "2.5",
          "SUPPORT": {
            "deeplink-list": ["deeplink"],
            "list": ["episode"],
            "grid-preview-one": grid,
            "grid-preview-two": grid,
            "slideshow": grid,
            "message": ["call_onboarding"],
            "grid": grid,
            "horizontal-grid": grid,
            "horizontal-list": ["track", "song"],
            "item-highlight": ["radio"],
            "large-card": ["album", "playlist", "show", "video-link"],
            "long-card-horizontal-grid": grid,
            "ads": [], //Nope
            // ADDED BY VERSION 2.5
            "small-horizontal-grid": ["flow"],
            "filterable-grid": ["flow"],
          },
          "LANG": settings.deezerLanguage,
          "OPTIONS": []
        }));

    return HomePage.fromPrivateJson(data['results']);
  }

  //Log song listen to deezer
  Future logListen(String trackId,
      {int seek = 0, int pause = 0, int sync = 1, int? timestamp}) async {
    await callApi('log.listen', params: {
      'params': {
        'timestamp': timestamp ?? DateTime.now().millisecondsSinceEpoch,
        'ts_listen': DateTime.now().millisecondsSinceEpoch,
        'type': 1,
        'stat': {
          'seek': seek, // amount of times seeked
          'pause': pause, // amount of times paused
          'sync': sync
        },
        'media': {'id': trackId, 'type': 'song', 'format': 'MP3_128'}
      }
    });
  }

  Future<HomePage> getChannel(String? target) async {
    List grid = [
      'album',
      'artist',
      'channel',
      'flow',
      'playlist',
      'radio',
      'show',
      'smarttracklist',
      'track',
      'user'
    ];
    Map data = await callApi('page.get',
        gatewayInput: jsonEncode({
          'PAGE': target,
          "VERSION": "2.5",
          "SUPPORT": {
            "deeplink-list": ["deeplink"],
            "list": ["episode"],
            "grid-preview-one": grid,
            "grid-preview-two": grid,
            "slideshow": grid,
            "message": ["call_onboarding"],

            "grid": grid,
            "horizontal-grid": grid,
            "item-highlight": ["radio"],
            "large-card": ["album", "playlist", "show", "video-link"],
            "ads": [] //Nope
          },
          "LANG": settings.deezerLanguage,
          "OPTIONS": []
        }));
    return HomePage.fromPrivateJson(data['results']);
  }

  //Add playlist to library
  Future addPlaylist(String id) async {
    await callApi('playlist.addFavorite',
        params: {'parent_playlist_id': int.parse(id)});
  }

  //Remove playlist from library
  Future removePlaylist(String id) async {
    await callApi('playlist.deleteFavorite',
        params: {'playlist_id': int.parse(id)});
  }

  //Delete playlist
  Future deletePlaylist(String? id) async {
    await callApi('playlist.delete', params: {'playlist_id': id});
  }

  //Create playlist
  //Status 1 - private, 2 - collaborative
  Future<String> createPlaylist(String? title,
      {String? description = "",
      int? status = 1,
      List<String> trackIds = const []}) async {
    Map data = await callApi('playlist.create', params: {
      'title': title,
      'description': description,
      'songs': trackIds
          .map<List>((id) => [int.parse(id), trackIds.indexOf(id)])
          .toList(),
      'status': status
    });
    //Return playlistId
    return data['results'].toString();
  }

  //Get part of discography
  Future<List<Album>?> discographyPage(String artistId,
      {int start = 0, int nb = 50}) async {
    Map data = await callApi('album.getDiscography', params: {
      'art_id': int.parse(artistId),
      'discography_mode': 'all',
      'nb': nb,
      'start': start,
      'nb_songs': 30
    });

    return data['results']['data']
        .map<Album>((a) => Album.fromPrivateJson(a))
        .toList();
  }

  Future<List<String>?> searchSuggestions(String? query) async {
    Map data =
        await callApi('search_getSuggestedQueries', params: {'QUERY': query});
    return (data['results']['SUGGESTION'] as List?)
        ?.map<String>((s) => s['QUERY'] as String)
        .toList();
  }

  //Get smart radio for artist id
  Future<List<Track>?> smartRadio(String artistId) async {
    Map data = await callApi('smart.getSmartRadio',
        params: {'art_id': int.parse(artistId)});
    return data['results']['data']
        .map<Track>((t) => Track.fromPrivateJson(t))
        .toList();
  }

  //Update playlist metadata, status = see createPlaylist
  Future updatePlaylist(String id, String title, String description,
      {int? status = 1}) async {
    await callApi('playlist.update', params: {
      'description': description,
      'title': title,
      'playlist_id': int.parse(id),
      'status': status,
      'songs': []
    });
  }

  //Get shuffled library
  Future<List<Track>?> libraryShuffle({int start = 0}) async {
    Map data = await callApi('tracklist.getShuffledCollection',
        params: {'nb': 50, 'start': start});
    return data['results']['data']
        .map<Track>((t) => Track.fromPrivateJson(t))
        .toList();
  }

  //Get similar tracks for track with id [trackId]
  Future<List<Track>?> playMix(String? trackId) async {
    Map data = await callApi('song.getContextualTrackMix', params: {
      'sng_ids': [trackId]
    });
    return data['results']['data']
        .map<Track>((t) => Track.fromPrivateJson(t))
        .toList();
  }

  Future<List<ShowEpisode>?> allShowEpisodes(String? showId) async {
    Map data = await callApi('deezer.pageShow', params: {
      'country': settings.deezerCountry,
      'lang': settings.deezerLanguage,
      'nb': 1000,
      'show_id': showId,
      'start': 0,
      'user_id': int.parse(deezerAPI.userId!)
    });
    return data['results']['EPISODES']['data']
        .map<ShowEpisode>((e) => ShowEpisode.fromPrivateJson(e))
        .toList();
  }
}