using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Jellyfin.Api.Constants;
using Jellyfin.Api.Extensions;
using Jellyfin.Api.Helpers;
using Jellyfin.Data.Enums;
using MediaBrowser.Common.Api;
using MediaBrowser.Controller.Configuration;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Entities.Audio;
using MediaBrowser.Controller.Entities.TV;
using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.LiveTv;
using MediaBrowser.Controller.Providers;
using MediaBrowser.Model.Dto;
using MediaBrowser.Model.Entities;
using MediaBrowser.Model.Globalization;
using MediaBrowser.Model.IO;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;

namespace Jellyfin.Api.Controllers;

/// <summary>
/// Item update controller.
/// </summary>
[Route("")]
[Authorize(Policy = Policies.RequiresElevation)]
public class ItemUpdateController : BaseJellyfinApiController
{
    private readonly ILibraryManager _libraryManager;
    private readonly IProviderManager _providerManager;
    private readonly ILocalizationManager _localizationManager;
    private readonly IFileSystem _fileSystem;
    private readonly IServerConfigurationManager _serverConfigurationManager;

    /// <summary>
    /// Initializes a new instance of the <see cref="ItemUpdateController"/> class.
    /// </summary>
    /// <param name="fileSystem">Instance of the <see cref="IFileSystem"/> interface.</param>
    /// <param name="libraryManager">Instance of the <see cref="ILibraryManager"/> interface.</param>
    /// <param name="providerManager">Instance of the <see cref="IProviderManager"/> interface.</param>
    /// <param name="localizationManager">Instance of the <see cref="ILocalizationManager"/> interface.</param>
    /// <param name="serverConfigurationManager">Instance of the <see cref="IServerConfigurationManager"/> interface.</param>
    public ItemUpdateController(
        IFileSystem fileSystem,
        ILibraryManager libraryManager,
        IProviderManager providerManager,
        ILocalizationManager localizationManager,
        IServerConfigurationManager serverConfigurationManager)
    {
        _libraryManager = libraryManager;
        _providerManager = providerManager;
        _localizationManager = localizationManager;
        _fileSystem = fileSystem;
        _serverConfigurationManager = serverConfigurationManager;
    }

    /// <summary>
    /// Updates an item.
    /// </summary>
    /// <param name="itemId">The item id.</param>
    /// <param name="request">The new item properties.</param>
    /// <response code="204">Item updated.</response>
    /// <response code="404">Item not found.</response>
    /// <returns>An <see cref="NoContentResult"/> on success, or a <see cref="NotFoundResult"/> if the item could not be found.</returns>
    [HttpPost("Items/{itemId}")]
    [ProducesResponseType(StatusCodes.Status204NoContent)]
    [ProducesResponseType(StatusCodes.Status404NotFound)]
    public async Task<ActionResult> UpdateItem([FromRoute, Required] Guid itemId, [FromBody, Required] BaseItemDto request)
    {
        var item = _libraryManager.GetItemById<BaseItem>(itemId, User.GetUserId());
        if (item is null)
        {
            return NotFound();
        }

        var newLockData = request.LockData ?? false;
        var isLockedChanged = item.IsLocked != newLockData;

        var series = item as Series;
        var displayOrderChanged = series is not null && !string.Equals(
            series.DisplayOrder ?? string.Empty,
            request.DisplayOrder ?? string.Empty,
            StringComparison.OrdinalIgnoreCase);

        // Do this first so that metadata savers can pull the updates from the database.
        if (request.People is not null)
        {
            _libraryManager.UpdatePeople(
                item,
                request.People.Select(x => new PersonInfo
                {
                    Name = x.Name,
                    Role = x.Role,
                    Type = x.Type
                }).ToList());
        }

        await UpdateItem(request, item).ConfigureAwait(false);

        item.OnMetadataChanged();

        await item.UpdateToRepositoryAsync(ItemUpdateType.MetadataEdit, CancellationToken.None).ConfigureAwait(false);

        if (isLockedChanged && item.IsFolder)
        {
            var folder = (Folder)item;

            foreach (var child in folder.GetRecursiveChildren())
            {
                child.IsLocked = newLockData;
                await child.UpdateToRepositoryAsync(ItemUpdateType.MetadataEdit, CancellationToken.None).ConfigureAwait(false);
            }
        }

        if (displayOrderChanged)
        {
            _providerManager.QueueRefresh(
                series!.Id,
                new MetadataRefreshOptions(new DirectoryService(_fileSystem))
                {
                    MetadataRefreshMode = MetadataRefreshMode.FullRefresh,
                    ImageRefreshMode = MetadataRefreshMode.FullRefresh,
                    ReplaceAllMetadata = true
                },
                RefreshPriority.High);
        }

        return NoContent();
    }

    /// <summary>
    /// Gets metadata editor info for an item.
    /// </summary>
    /// <param name="itemId">The item id.</param>
    /// <response code="200">Item metadata editor returned.</response>
    /// <response code="404">Item not found.</response>
    /// <returns>An <see cref="OkResult"/> on success containing the metadata editor, or a <see cref="NotFoundResult"/> if the item could not be found.</returns>
    [HttpGet("Items/{itemId}/MetadataEditor")]
    [ProducesResponseType(StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status404NotFound)]
    public ActionResult<MetadataEditorInfo> GetMetadataEditorInfo([FromRoute, Required] Guid itemId)
    {
        var item = _libraryManager.GetItemById<BaseItem>(itemId, User.GetUserId());
        if (item is null)
        {
            return NotFound();
        }

        var info = new MetadataEditorInfo
        {
            ParentalRatingOptions = _localizationManager.GetParentalRatings().ToList(),
            ExternalIdInfos = _providerManager.GetExternalIdInfos(item).ToArray(),
            Countries = _localizationManager.GetCountries().ToArray(),
            Cultures = _localizationManager.GetCultures()
                .DistinctBy(c => c.DisplayName, StringComparer.OrdinalIgnoreCase)
                .OrderBy(c => c.DisplayName)
                .ToArray()
        };

        if (!item.IsVirtualItem
            && item is not ICollectionFolder
            && item is not UserView
            && item is not AggregateFolder
            && item is not LiveTvChannel
            && item is not IItemByName
            && item.SourceType == SourceType.Library)
        {
            var inheritedContentType = _libraryManager.GetInheritedContentType(item);
            var configuredContentType = _libraryManager.GetConfiguredContentType(item);

            if (inheritedContentType is null || configuredContentType is not null)
            {
                info.ContentTypeOptions = GetContentTypeOptions(true).ToArray();
                info.ContentType = configuredContentType;

                if (inheritedContentType is null || inheritedContentType == CollectionType.tvshows)
                {
                    info.ContentTypeOptions = info.ContentTypeOptions
                        .Where(i => string.IsNullOrWhiteSpace(i.Value)
                                    || string.Equals(i.Value, "TvShows", StringComparison.OrdinalIgnoreCase))
                        .ToArray();
                }
            }
        }

        return info;
    }

    /// <summary>
    /// Updates an item's content type.
    /// </summary>
    /// <param name="itemId">The item id.</param>
    /// <param name="contentType">The content type of the item.</param>
    /// <response code="204">Item content type updated.</response>
    /// <response code="404">Item not found.</response>
    /// <returns>An <see cref="NoContentResult"/> on success, or a <see cref="NotFoundResult"/> if the item could not be found.</returns>
    [HttpPost("Items/{itemId}/ContentType")]
    [ProducesResponseType(StatusCodes.Status204NoContent)]
    [ProducesResponseType(StatusCodes.Status404NotFound)]
    public ActionResult UpdateItemContentType([FromRoute, Required] Guid itemId, [FromQuery] string? contentType)
    {
        var item = _libraryManager.GetItemById<BaseItem>(itemId, User.GetUserId());
        if (item is null)
        {
            return NotFound();
        }

        var path = item.ContainingFolderPath;

        var types = _serverConfigurationManager.Configuration.ContentTypes
            .Where(i => !string.IsNullOrWhiteSpace(i.Name))
            .Where(i => !string.Equals(i.Name, path, StringComparison.OrdinalIgnoreCase))
            .ToList();

        if (!string.IsNullOrWhiteSpace(contentType))
        {
            types.Add(new NameValuePair
            {
                Name = path,
                Value = contentType
            });
        }

        _serverConfigurationManager.Configuration.ContentTypes = types.ToArray();
        _serverConfigurationManager.SaveConfiguration();
        return NoContent();
    }

    private async Task UpdateItem(BaseItemDto request, BaseItem item)
    {
        item.Name = request.Name;
        item.ForcedSortName = request.ForcedSortName;

        item.OriginalTitle = string.IsNullOrWhiteSpace(request.OriginalTitle) ? null : request.OriginalTitle;

        item.CriticRating = request.CriticRating;

        item.CommunityRating = request.CommunityRating;
        item.IndexNumber = request.IndexNumber;
        item.ParentIndexNumber = request.ParentIndexNumber;
        item.Overview = request.Overview;
        item.Genres = request.Genres;

        if (item is Episode episode)
        {
            episode.AirsAfterSeasonNumber = request.AirsAfterSeasonNumber;
            episode.AirsBeforeEpisodeNumber = request.AirsBeforeEpisodeNumber;
            episode.AirsBeforeSeasonNumber = request.AirsBeforeSeasonNumber;
        }

        if (request.Height is not null && item is LiveTvChannel channel)
        {
            channel.Height = request.Height.Value;
        }

        if (request.Taglines is not null)
        {
            item.Tagline = request.Taglines.FirstOrDefault();
        }

        if (request.Studios is not null)
        {
            item.Studios = Array.ConvertAll(request.Studios, x => x.Name);
        }

        if (request.DateCreated.HasValue)
        {
            item.DateCreated = NormalizeDateTime(request.DateCreated.Value);
        }

        item.EndDate = request.EndDate.HasValue ? NormalizeDateTime(request.EndDate.Value) : null;
        item.PremiereDate = request.PremiereDate.HasValue ? NormalizeDateTime(request.PremiereDate.Value) : null;
        item.ProductionYear = request.ProductionYear;

        request.OfficialRating = string.IsNullOrWhiteSpace(request.OfficialRating) ? null : request.OfficialRating;
        item.OfficialRating = request.OfficialRating;
        item.CustomRating = request.CustomRating;

        var currentTags = item.Tags;
        var newTags = request.Tags;
        var removedTags = currentTags.Except(newTags).ToList();
        var addedTags = newTags.Except(currentTags).ToList();
        item.Tags = newTags;

        if (item is Series rseries)
        {
            foreach (var season in rseries.Children.OfType<Season>())
            {
                if (!season.LockedFields.Contains(MetadataField.OfficialRating))
                {
                    season.OfficialRating = request.OfficialRating;
                }

                season.CustomRating = request.CustomRating;

                if (!season.LockedFields.Contains(MetadataField.Tags))
                {
                    season.Tags = season.Tags.Concat(addedTags).Except(removedTags).Distinct(StringComparer.OrdinalIgnoreCase).ToArray();
                }

                season.OnMetadataChanged();
                await season.UpdateToRepositoryAsync(ItemUpdateType.MetadataEdit, CancellationToken.None).ConfigureAwait(false);

                foreach (var ep in season.Children.OfType<Episode>())
                {
                    if (!ep.LockedFields.Contains(MetadataField.OfficialRating))
                    {
                        ep.OfficialRating = request.OfficialRating;
                    }

                    ep.CustomRating = request.CustomRating;

                    if (!ep.LockedFields.Contains(MetadataField.Tags))
                    {
                        ep.Tags = ep.Tags.Concat(addedTags).Except(removedTags).Distinct(StringComparer.OrdinalIgnoreCase).ToArray();
                    }

                    ep.OnMetadataChanged();
                    await ep.UpdateToRepositoryAsync(ItemUpdateType.MetadataEdit, CancellationToken.None).ConfigureAwait(false);
                }
            }
        }
        else if (item is Season season)
        {
            foreach (var ep in season.Children.OfType<Episode>())
            {
                if (!ep.LockedFields.Contains(MetadataField.OfficialRating))
                {
                    ep.OfficialRating = request.OfficialRating;
                }

                ep.CustomRating = request.CustomRating;

                if (!ep.LockedFields.Contains(MetadataField.Tags))
                {
                    ep.Tags = ep.Tags.Concat(addedTags).Except(removedTags).Distinct(StringComparer.OrdinalIgnoreCase).ToArray();
                }

                ep.OnMetadataChanged();
                await ep.UpdateToRepositoryAsync(ItemUpdateType.MetadataEdit, CancellationToken.None).ConfigureAwait(false);
            }
        }
        else if (item is MusicAlbum album)
        {
            foreach (BaseItem track in album.Children)
            {
                if (!track.LockedFields.Contains(MetadataField.OfficialRating))
                {
                    track.OfficialRating = request.OfficialRating;
                }

                track.CustomRating = request.CustomRating;

                if (!track.LockedFields.Contains(MetadataField.Tags))
                {
                    track.Tags = track.Tags.Concat(addedTags).Except(removedTags).Distinct(StringComparer.OrdinalIgnoreCase).ToArray();
                }

                track.OnMetadataChanged();
                await track.UpdateToRepositoryAsync(ItemUpdateType.MetadataEdit, CancellationToken.None).ConfigureAwait(false);
            }
        }

        if (request.ProductionLocations is not null)
        {
            item.ProductionLocations = request.ProductionLocations;
        }

        item.PreferredMetadataCountryCode = request.PreferredMetadataCountryCode;
        item.PreferredMetadataLanguage = request.PreferredMetadataLanguage;

        if (item is IHasDisplayOrder hasDisplayOrder)
        {
            hasDisplayOrder.DisplayOrder = request.DisplayOrder;
        }

        if (item is IHasAspectRatio hasAspectRatio)
        {
            hasAspectRatio.AspectRatio = request.AspectRatio;
        }

        item.IsLocked = request.LockData ?? false;

        if (request.LockedFields is not null)
        {
            item.LockedFields = request.LockedFields;
        }

        // Only allow this for series. Runtimes for media comes from ffprobe.
        if (item is Series)
        {
            item.RunTimeTicks = request.RunTimeTicks;
        }

        foreach (var pair in request.ProviderIds.ToList())
        {
            if (string.IsNullOrEmpty(pair.Value))
            {
                request.ProviderIds.Remove(pair.Key);
            }
        }

        item.ProviderIds = request.ProviderIds;

        if (item is Video video)
        {
            video.Video3DFormat = request.Video3DFormat;
        }

        if (request.AlbumArtists is not null)
        {
            if (item is IHasAlbumArtist hasAlbumArtists)
            {
                hasAlbumArtists.AlbumArtists = Array.ConvertAll(request.AlbumArtists, i => i.Name);
            }
        }

        if (request.ArtistItems is not null)
        {
            if (item is IHasArtist hasArtists)
            {
                hasArtists.Artists = Array.ConvertAll(request.ArtistItems, i => i.Name);
            }
        }

        switch (item)
        {
            case Audio song:
                song.Album = request.Album;
                break;
            case MusicVideo musicVideo:
                musicVideo.Album = request.Album;
                break;
            case Series series:
                {
                    series.Status = GetSeriesStatus(request);

                    if (request.AirDays is not null)
                    {
                        series.AirDays = request.AirDays;
                        series.AirTime = request.AirTime;
                    }

                    break;
                }
        }
    }

    private SeriesStatus? GetSeriesStatus(BaseItemDto item)
    {
        if (string.IsNullOrEmpty(item.Status))
        {
            return null;
        }

        return Enum.Parse<SeriesStatus>(item.Status, true);
    }

    private DateTime NormalizeDateTime(DateTime val)
    {
        return DateTime.SpecifyKind(val, DateTimeKind.Utc);
    }

    private List<NameValuePair> GetContentTypeOptions(bool isForItem)
    {
        var list = new List<NameValuePair>();

        if (isForItem)
        {
            list.Add(new NameValuePair
            {
                Name = "Inherit",
                Value = string.Empty
            });
        }

        list.Add(new NameValuePair
        {
            Name = "Movies",
            Value = "movies"
        });
        list.Add(new NameValuePair
        {
            Name = "Music",
            Value = "music"
        });
        list.Add(new NameValuePair
        {
            Name = "Shows",
            Value = "tvshows"
        });

        if (!isForItem)
        {
            list.Add(new NameValuePair
            {
                Name = "Books",
                Value = "books"
            });
        }

        list.Add(new NameValuePair
        {
            Name = "HomeVideos",
            Value = "homevideos"
        });
        list.Add(new NameValuePair
        {
            Name = "MusicVideos",
            Value = "musicvideos"
        });
        list.Add(new NameValuePair
        {
            Name = "Photos",
            Value = "photos"
        });

        if (!isForItem)
        {
            list.Add(new NameValuePair
            {
                Name = "MixedContent",
                Value = string.Empty
            });
        }

        foreach (var val in list)
        {
            val.Name = _localizationManager.GetLocalizedString(val.Name);
        }

        return list;
    }
}