PlaylistShared/PlaylistShared.Api/Services/YandexMusicService.cs

using Microsoft.AspNetCore.DataProtection;
using PlaylistShared.Api.Entities;
using PlaylistShared.Api.Extensions;
using PlaylistShared.Shared.Enums;
using PlaylistShared.Shared.Yandex;
using YandexMusic;
using YandexMusic.API.Extensions.API;
using YandexMusic.API.Models.Playlist;
using YandexMusic.API.Models.Track;

namespace PlaylistShared.Api.Services;

public class YandexMusicService
{
    private readonly IDataProtector _dataProtector;

    public YandexMusicService(IDataProtectionProvider provider)
    {
        _dataProtector = provider.CreateProtector("YandexTokens");
    }

    private async Task<YandexMusicClient?> CreateClientAsync(ApplicationUser user)
    {
        if (string.IsNullOrEmpty(user.YandexAccessToken))
            return null;

        string decryptedToken;
        try
        {
            decryptedToken = _dataProtector.Unprotect(user.YandexAccessToken);
        }
        catch
        {
            return null;
        }

        var client = new YandexMusicClient();
        var success = await client.Authorize(decryptedToken);
        return success ? client : null;
    }

    public async Task<YPlaylist?> GetPlaylistAsync(ApplicationUser user, string ownerUid, string kind)
    {
        var client = await CreateClientAsync(user);
        if (client == null) return null;
        return await client.GetPlaylistAsync(ownerUid, kind);
    }

    public async Task<YPlaylist?> CreatePlaylistAsync(ApplicationUser user, string title)
    {
        var client = await CreateClientAsync(user);
        if (client == null) return null;
        return await client.CreatePlaylistAsync(title);
    }

    public async Task<YPlaylist?> AddTracksAsync(ApplicationUser user, string ownerUid, string kind, IEnumerable<string> trackIds)
    {
        var client = await CreateClientAsync(user);
        if (client == null) return null;

        var playlist = await client.GetPlaylistAsync(ownerUid, kind);
        if (playlist == null) return null;

        var tracks = await client.GetTracksAsync(trackIds);
        if (tracks == null || !tracks.Any()) return null;

        var insertedTracks = tracks.Where(t => !playlist.Tracks.Any(p => p.Track.Id == t.Id)).ToArray();

        return await playlist.InsertTracksAsync(insertedTracks);
    }

    public async Task<YPlaylist?> RemoveTracksAsync(ApplicationUser user, string ownerUid, string kind, IEnumerable<string> trackIds)
    {
        var client = await CreateClientAsync(user);
        if (client == null) return null;
        var tracks = await client.GetTracksAsync(trackIds);
        if (tracks == null || !tracks.Any()) return null;
        var playlist = await client.GetPlaylistAsync(ownerUid, kind);
        if (playlist == null) return null;
        return await playlist.RemoveTracksAsync(tracks.ToArray());
    }

    public async Task<string?> GetTrackFileUrlAsync(ApplicationUser user, string trackId)
    {
        var track = await GetYTrackAsync(user, trackId);
        if (track == null) return null;
        return await track.GetLinkAsync();
    }

    public async Task<YTrack?> GetYTrackAsync(ApplicationUser user, string trackId)
    {
        using var client = await CreateClientAsync(user);
        if (client == null) return null;
        var track = await client.GetTrackAsync(trackId);
        return track;
    }

    public string EncryptToken(string token) => _dataProtector.Protect(token);

    public string DecryptToken(string encryptedToken)
    {
        try
        {
            return _dataProtector.Unprotect(encryptedToken);
        }
        catch
        {
            return null;
        }
    }

    public async Task<YandexSearchResult> SearchAsync(
        ApplicationUser user,
        string query,
        TrackSearchType? searchType = TrackSearchType.All,
        int limit = 20
        )
    {
        var client = await CreateClientAsync(user);
        if (client == null) return new YandexSearchResult();

        var ySerchType = searchType switch
        {
            TrackSearchType.Artist => YandexMusic.API.Models.Common.YSearchType.Artist,
            TrackSearchType.Album => YandexMusic.API.Models.Common.YSearchType.Album,
            TrackSearchType.Playlist => YandexMusic.API.Models.Common.YSearchType.Playlist,
            TrackSearchType.Track => YandexMusic.API.Models.Common.YSearchType.Track,
            _ => YandexMusic.API.Models.Common.YSearchType.All
        };

        var searchResult = await client.SearchAsync(query, ySerchType, page: 0, pageSize: limit);
        if (searchResult?.Tracks?.Results == null) return new YandexSearchResult();

        return new YandexSearchResult
        {
            Tracks = searchResult.Tracks.Results.Select(t => new YandexTrack
            {
                TrackId = t.Id,
                Title = t.Title,
                Artists = t.Artists.Select(t => new YandexArtist()
                {
                    Id = t.Id,
                    Name = t.Name,
                    CoverUrl = t.Cover.GetUrl(),
                    Description = t.Description?.Text ?? string.Empty,
                }).ToList(),
                CoverUri = t.CoverUri,
                DurationMs = t.DurationMs,
            }).ToList(),

            Playlists = searchResult.Playlists?.Results.Select(p => new YandexPlaylist
            {
                Uuid = p.PlaylistUuid,
                Kind = p.Kind,
                OwnerUid = p.Owner?.Uid ?? string.Empty,
                Title = p.Title,
                Description = p.Description,
                CoverUrl = string.IsNullOrEmpty(p.CoverUri) ? p.Cover.GetUrl() : p.CoverUri,
                TrackCount = p.TrackCount,
            }).ToList(),

            Artists = searchResult.Artists?.Results.Select(a => new YandexArtist
            {
                Id = a.Id,
                Name = a.Name,
                CoverUrl = a.Cover.GetUrl(),
                Description = a.Description?.Text ?? string.Empty,
            }).ToList(),

            Albums = searchResult.Albums?.Results.Select(a => new YandexAlbum
            {
                Id = a.Id,
                Title = a.Title,
                Artists = a.Artists.Select(t => new YandexArtist()
                {
                    Id = t.Id,
                    Name = t.Name,
                    CoverUrl = t.Cover.GetUrl(),
                    Description = t.Description?.Text ?? string.Empty,
                }).ToList(),
                CoverUrl = string.IsNullOrEmpty(a.CoverUri) ? a.Cover.GetUrl() : a.CoverUri,
                Description = a.Description,
            }).ToList(),
        };
    }

    public async Task<YandexSearchResult> SearchTracksByIdAsync(
        ApplicationUser user,
        string id,
        TrackSearchType searchType,
        int limit = 20
        )
    {
        YandexSearchResult result = new();

        var client = await CreateClientAsync(user);
        if (client == null) return result;

        if (searchType == TrackSearchType.All)
        {
            throw new Exception("Для поиска по ID необходимо указать конкретный тип (трек, альбом, исполнитель или плейлист).");
        }

        else if (searchType == TrackSearchType.Track)
        {
            var track = await client.GetTrackAsync(id);

            if (track != null)
            {
                result.Tracks = new List<YandexTrack>()
                {
                    new()
                    {
                        TrackId = track.Id,
                        Title = track.Title,
                        Artists = track.Artists.Select(t => new YandexArtist()
                        {
                            Id = t.Id,
                            Name = t.Name,
                            CoverUrl = t.Cover.GetUrl(),
                            Description = t.Description?.Text ?? string.Empty,
                        }).ToList(),
                        CoverUri = track.CoverUri ?? string.Empty,
                        DurationMs = track.DurationMs,
                    }
                };
            }
        }

        else if (searchType == TrackSearchType.Album)
        {
            var album = await client.GetAlbumAsync(id);
            if (album != null)
            {
                result.Tracks = album.Volumes.SelectMany(v => v).Select(t => new YandexTrack
                {
                    TrackId = t.Id,
                    Title = t.Title,
                    Artists = t.Artists.Select(t => new YandexArtist()
                    {
                        Id = t.Id,
                        Name = t.Name,
                        CoverUrl = t.Cover.GetUrl(),
                        Description = t.Description?.Text ?? string.Empty,
                    }).ToList(),
                    CoverUri = t.CoverUri ?? string.Empty,
                    DurationMs = t.DurationMs,
                }).ToList();
            }
        }

        else if (searchType == TrackSearchType.Artist)
        {
            var artist = await client.GetArtistAsync(id);
            if (artist != null)
            {
                result.Albums = artist.Albums.Select(a => new YandexAlbum()
                {
                    Id = a.Id,
                    Title = a.Title,
                    Artists = a.Artists.Select(t => new YandexArtist()
                    {
                        Id = t.Id,
                        Name = t.Name,
                        CoverUrl = t.Cover.GetUrl(),
                        Description = t.Description?.Text ?? string.Empty,
                    }).ToList(),
                    CoverUrl = string.IsNullOrEmpty(a.CoverUri) ? a.Cover.GetUrl() : a.CoverUri,
                    Description = a.Description,
                }).ToList();

                result.Playlists = artist.Playlists.Select(p => new YandexPlaylist
                {
                    Uuid = p.PlaylistUuid,
                    Kind = p.Kind,
                    OwnerUid = p.Owner?.Uid ?? string.Empty,
                    Title = p.Title,
                    Description = p.Description,
                    CoverUrl = p.Cover.GetUrl(),
                    TrackCount = p.TrackCount,
                }).ToList();


                result.Tracks = artist.PopularTracks.Select(t => new YandexTrack
                {
                    TrackId = t.Id,
                    Title = t.Title,
                    Artists = t.Artists.Select(a => new YandexArtist()
                    {
                        Id = a.Id,
                        Name = a.Name,
                        CoverUrl = a.Cover.GetUrl(),
                        Description = a.Description?.Text ?? string.Empty,
                    }).ToList(),
                    CoverUri = t.CoverUri ?? string.Empty,
                    DurationMs = t.DurationMs,
                }).ToList();
            }
        }

        return result;
    }
}