using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;
using PlaylistShared.Api.Entities;
using PlaylistShared.Api.Extensions;
using PlaylistShared.Api.Services;
using PlaylistShared.Shared.DTO;
using PlaylistShared.Shared.Enums;
using PlaylistShared.Shared.Models;
using YandexMusic;

namespace PlaylistShared.Api.Controllers;

[ApiController]
[Route("api/[controller]")]
[Authorize]
public class PlaylistController : ControllerBase
{
    private readonly UserManager<ApplicationUser> _userManager;
    private readonly SharedPlaylistService _sharedService;
    private readonly YandexMusicService _yandexService;
    private readonly TrackAdditionLogService _trackLogService;

    public PlaylistController(
        UserManager<ApplicationUser> userManager,
        SharedPlaylistService sharedService,
        YandexMusicService yandexService,
        TrackAdditionLogService trackLogService)
    {
        _userManager = userManager;
        _sharedService = sharedService;
        _yandexService = yandexService;
        _trackLogService = trackLogService;
    }

    [HttpPost("add-tracks")]
    public async Task<ActionResult<ApiResponse<object>>> AddTracks([FromBody] AddTrackRequest request)
    {
        var currentUserId = User.GetUserId();
        var playlist = await _sharedService.GetEntityByTokenAsync(request.SharedPlaylistToken);
        if (playlist == null)
            return NotFound(ApiResponse<object>.Fail(new ErrorResponse { StatusCode = 404, Message = "Плейлист не найден" }));

        if (!await _sharedService.CanAddTrackAsync(playlist, currentUserId))
            return StatusCode(403, ApiResponse<object>.Fail(new ErrorResponse { StatusCode = 403, Message = "Недостаточно прав для добавления треков" }));

        var creator = await _userManager.FindByIdAsync(playlist.CreatorUserId.ToString());
        if (creator == null)
            return StatusCode(500, ApiResponse<object>.Fail(new ErrorResponse { StatusCode = 500, Message = "Владелец плейлиста не найден" }));

        var updatedPlaylist = await _yandexService.AddTracksAsync(creator, playlist.YandexPlaylistOwnerUid, playlist.YandexPlaylistKind, request.TrackIds);
        if (updatedPlaylist == null)
            return StatusCode(500, ApiResponse<object>.Fail(new ErrorResponse { StatusCode = 500, Message = "Ошибка при добавлении треков в Яндекс.Музыку" }));

        // Логируем добавления для права AddedByUserOnly
        foreach (var trackId in request.TrackIds)
            await _trackLogService.LogAdditionAsync(playlist.Id, trackId, currentUserId);

        return Ok(ApiResponse<object>.Ok(new { message = "Треки успешно добавлены" }));
    }

    [HttpPost("remove-tracks")]
    public async Task<ActionResult<ApiResponse<object>>> RemoveTracks([FromBody] AddTrackRequest request)
    {
        var currentUserId = User.GetUserId();
        var playlist = await _sharedService.GetEntityByTokenAsync(request.SharedPlaylistToken);
        if (playlist == null)
            return NotFound(ApiResponse<object>.Fail(new ErrorResponse { StatusCode = 404, Message = "Плейлист не найден" }));

        // Проверяем права на удаление каждого трека
        foreach (var trackId in request.TrackIds)
        {
            if (!await _sharedService.CanRemoveTrackAsync(playlist, currentUserId, trackId))
                return StatusCode(403, ApiResponse<object>.Fail(new ErrorResponse { StatusCode = 403, Message = $"Недостаточно прав для удаления трека {trackId}" }));
        }

        var creator = await _userManager.FindByIdAsync(playlist.CreatorUserId.ToString());
        if (creator == null)
            return StatusCode(500, ApiResponse<object>.Fail(new ErrorResponse { StatusCode = 500, Message = "Владелец плейлиста не найден" }));

        var updatedPlaylist = await _yandexService.RemoveTracksAsync(creator, playlist.YandexPlaylistOwnerUid, playlist.YandexPlaylistKind, request.TrackIds);
        if (updatedPlaylist == null)
            return StatusCode(500, ApiResponse<object>.Fail(new ErrorResponse { StatusCode = 500, Message = "Ошибка при удалении треков из Яндекс.Музыки" }));

        // Удаляем логи добавления для этих треков
        foreach (var trackId in request.TrackIds)
            await _trackLogService.RemoveLogsForTrackAsync(playlist.Id, trackId);

        return Ok(ApiResponse<object>.Ok(new { message = "Треки успешно удалены" }));
    }

    [HttpGet("info/{ownerUid}/{kind}")]
    public async Task<ActionResult<ApiResponse<object>>> GetPlaylistInfo(string ownerUid, string kind)
    {
        var currentUserId = User.GetUserId();
        // Найти шеринг-плейлист по данным Яндекс
        var shared = await _sharedService.GetEntityByTokenAsync(null); // не можем по токену, надо по параметрам
        // Для простоты сделаем отдельный метод поиска по kind/ownerUid
        var playlistEntity = await _sharedService.GetByYandexIdsAsync(ownerUid, kind);
        if (playlistEntity == null)
            return NotFound(ApiResponse<object>.Fail(new ErrorResponse { StatusCode = 404, Message = "Плейлист не найден" }));

        if (!await _sharedService.CanViewAsync(playlistEntity, currentUserId))
            return Unauthorized();

        var creator = await _userManager.FindByIdAsync(playlistEntity.CreatorUserId.ToString());
        var yandexPlaylist = await _yandexService.GetPlaylistAsync(creator, ownerUid, kind);
        return Ok(ApiResponse<object>.Ok(yandexPlaylist));
    }

    [HttpGet("my")]
    public async Task<ActionResult<ApiResponse<List<YandexPlaylistInfo>>>> GetMyPlaylists()
    {
        var userId = User.GetUserId();
        var user = await _userManager.FindByIdAsync(userId.ToString());
        if (user == null) return Unauthorized();

        var decryptedToken = _yandexService.DecryptToken(user.YandexAccessToken);
        if (string.IsNullOrEmpty(decryptedToken))
            return BadRequest(ApiResponse<object>.Fail(new ErrorResponse { StatusCode = 400, Message = "Токен Яндекс.Музыки не установлен или недействителен" }));

        var yandexClient = new YandexMusicClient();
        var authSuccess = await yandexClient.Authorize(decryptedToken);
        if (!authSuccess)
            return BadRequest(ApiResponse<object>.Fail(new ErrorResponse { StatusCode = 400, Message = "Не удалось авторизоваться в Яндекс.Музыке. Проверьте токен." }));

        var favorites = await yandexClient.GetFavoritesAsync();
        var ownPlaylists = favorites.Where(p => p.Owner.Uid == yandexClient.Account.Uid).ToList();

        var sharedPlaylists = await _sharedService.GetAllByUserAsync(userId);

        var result = ownPlaylists.Select(p => new YandexPlaylistInfo
        {
            Kind = p.Kind,
            OwnerUid = p.Owner.Uid,
            Title = p.Title,
            CoverUrl = p.Cover?.GetUrl() ?? "",
            TrackCount = p.TrackCount,
            IsShared = sharedPlaylists.Any(s => s.YandexPlaylistKind == p.Kind && s.YandexPlaylistOwnerUid == p.Owner.Uid),
            ShareToken = sharedPlaylists.FirstOrDefault(s => s.YandexPlaylistKind == p.Kind && s.YandexPlaylistOwnerUid == p.Owner.Uid)?.ShareToken,
        }).ToList();

        return Ok(ApiResponse<List<YandexPlaylistInfo>>.Ok(result));
    }

    [HttpPost("share")]
    public async Task<ActionResult<ApiResponse<SharedPlaylistDto>>> SharePlaylist([FromBody] SharePlaylistRequest request)
    {
        var userId = User.GetUserId();
        var user = await _userManager.FindByIdAsync(userId.ToString());
        if (user == null) return Unauthorized();

        // Проверяем, что плейлист действительно принадлежит пользователю
        var yandexClient = new YandexMusicClient();
        await yandexClient.Authorize(_yandexService.DecryptToken(user.YandexAccessToken));
        var playlist = await yandexClient.GetPlaylistAsync(request.OwnerUid, request.Kind);
        if (playlist == null || playlist.Owner.Uid != yandexClient.Account.Uid)
            return BadRequest(ApiResponse<object>.Fail(new ErrorResponse { StatusCode = 400, Message = "Плейлист не принадлежит вам" }));

        var dto = new SharePlaylistDto
        {
            YandexPlaylistKind = request.Kind,
            YandexPlaylistOwnerUid = request.OwnerUid,
            Title = playlist.Title,
            Description = playlist.Description,
            ViewPermission = ViewPermission.Everyone,
            AddPermission = EditPermission.AuthorizedOnly,
            RemovePermission = EditPermission.AddedByUserOnly
        };

        var result = await _sharedService.CreateAsync(userId, dto);
        return Ok(ApiResponse<SharedPlaylistDto>.Ok(result));
    }
}