using System;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Globalization;
using System.Linq;
using Jellyfin.Api.Constants;
using Jellyfin.Api.Helpers;
using MediaBrowser.Controller.Drawing;
using MediaBrowser.Controller.Dto;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Entities.Audio;
using MediaBrowser.Controller.Entities.TV;
using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.LiveTv;
using MediaBrowser.Model.Entities;
using MediaBrowser.Model.Search;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;

namespace Jellyfin.Api.Controllers
{
    /// <summary>
    /// Search controller.
    /// </summary>
    [Route("Search/Hints")]
    [Authorize(Policy = Policies.DefaultAuthorization)]
    public class SearchController : BaseJellyfinApiController
    {
        private readonly ISearchEngine _searchEngine;
        private readonly ILibraryManager _libraryManager;
        private readonly IDtoService _dtoService;
        private readonly IImageProcessor _imageProcessor;

        /// <summary>
        /// Initializes a new instance of the <see cref="SearchController"/> class.
        /// </summary>
        /// <param name="searchEngine">Instance of <see cref="ISearchEngine"/> interface.</param>
        /// <param name="libraryManager">Instance of <see cref="ILibraryManager"/> interface.</param>
        /// <param name="dtoService">Instance of <see cref="IDtoService"/> interface.</param>
        /// <param name="imageProcessor">Instance of <see cref="IImageProcessor"/> interface.</param>
        public SearchController(
            ISearchEngine searchEngine,
            ILibraryManager libraryManager,
            IDtoService dtoService,
            IImageProcessor imageProcessor)
        {
            _searchEngine = searchEngine;
            _libraryManager = libraryManager;
            _dtoService = dtoService;
            _imageProcessor = imageProcessor;
        }

        /// <summary>
        /// Gets the search hint result.
        /// </summary>
        /// <param name="startIndex">Optional. The record index to start at. All items with a lower index will be dropped from the results.</param>
        /// <param name="limit">Optional. The maximum number of records to return.</param>
        /// <param name="userId">Optional. Supply a user id to search within a user's library or omit to search all.</param>
        /// <param name="searchTerm">The search term to filter on.</param>
        /// <param name="includeItemTypes">If specified, only results with the specified item types are returned. This allows multiple, comma delimeted.</param>
        /// <param name="excludeItemTypes">If specified, results with these item types are filtered out. This allows multiple, comma delimeted.</param>
        /// <param name="mediaTypes">If specified, only results with the specified media types are returned. This allows multiple, comma delimeted.</param>
        /// <param name="parentId">If specified, only children of the parent are returned.</param>
        /// <param name="isMovie">Optional filter for movies.</param>
        /// <param name="isSeries">Optional filter for series.</param>
        /// <param name="isNews">Optional filter for news.</param>
        /// <param name="isKids">Optional filter for kids.</param>
        /// <param name="isSports">Optional filter for sports.</param>
        /// <param name="includePeople">Optional filter whether to include people.</param>
        /// <param name="includeMedia">Optional filter whether to include media.</param>
        /// <param name="includeGenres">Optional filter whether to include genres.</param>
        /// <param name="includeStudios">Optional filter whether to include studios.</param>
        /// <param name="includeArtists">Optional filter whether to include artists.</param>
        /// <response code="200">Search hint returned.</response>
        /// <returns>An <see cref="SearchHintResult"/> with the results of the search.</returns>
        [HttpGet]
        [Description("Gets search hints based on a search term")]
        [ProducesResponseType(StatusCodes.Status200OK)]
        public ActionResult<SearchHintResult> Get(
            [FromQuery] int? startIndex,
            [FromQuery] int? limit,
            [FromQuery] Guid? userId,
            [FromQuery, Required] string searchTerm,
            [FromQuery] string? includeItemTypes,
            [FromQuery] string? excludeItemTypes,
            [FromQuery] string? mediaTypes,
            [FromQuery] string? parentId,
            [FromQuery] bool? isMovie,
            [FromQuery] bool? isSeries,
            [FromQuery] bool? isNews,
            [FromQuery] bool? isKids,
            [FromQuery] bool? isSports,
            [FromQuery] bool includePeople = true,
            [FromQuery] bool includeMedia = true,
            [FromQuery] bool includeGenres = true,
            [FromQuery] bool includeStudios = true,
            [FromQuery] bool includeArtists = true)
        {
            var result = _searchEngine.GetSearchHints(new SearchQuery
            {
                Limit = limit,
                SearchTerm = searchTerm,
                IncludeArtists = includeArtists,
                IncludeGenres = includeGenres,
                IncludeMedia = includeMedia,
                IncludePeople = includePeople,
                IncludeStudios = includeStudios,
                StartIndex = startIndex,
                UserId = userId ?? Guid.Empty,
                IncludeItemTypes = RequestHelpers.Split(includeItemTypes, ',', true),
                ExcludeItemTypes = RequestHelpers.Split(excludeItemTypes, ',', true),
                MediaTypes = RequestHelpers.Split(mediaTypes, ',', true),
                ParentId = parentId,

                IsKids = isKids,
                IsMovie = isMovie,
                IsNews = isNews,
                IsSeries = isSeries,
                IsSports = isSports
            });

            return new SearchHintResult
            {
                TotalRecordCount = result.TotalRecordCount,
                SearchHints = result.Items.Select(GetSearchHintResult).ToArray()
            };
        }

        /// <summary>
        /// Gets the search hint result.
        /// </summary>
        /// <param name="hintInfo">The hint info.</param>
        /// <returns>SearchHintResult.</returns>
        private SearchHint GetSearchHintResult(SearchHintInfo hintInfo)
        {
            var item = hintInfo.Item;

            var result = new SearchHint
            {
                Name = item.Name,
                IndexNumber = item.IndexNumber,
                ParentIndexNumber = item.ParentIndexNumber,
                Id = item.Id,
                Type = item.GetClientTypeName(),
                MediaType = item.MediaType,
                MatchedTerm = hintInfo.MatchedTerm,
                RunTimeTicks = item.RunTimeTicks,
                ProductionYear = item.ProductionYear,
                ChannelId = item.ChannelId,
                EndDate = item.EndDate
            };

            // legacy
            result.ItemId = result.Id;

            if (item.IsFolder)
            {
                result.IsFolder = true;
            }

            var primaryImageTag = _imageProcessor.GetImageCacheTag(item, ImageType.Primary);

            if (primaryImageTag != null)
            {
                result.PrimaryImageTag = primaryImageTag;
                result.PrimaryImageAspectRatio = _dtoService.GetPrimaryImageAspectRatio(item);
            }

            SetThumbImageInfo(result, item);
            SetBackdropImageInfo(result, item);

            switch (item)
            {
                case IHasSeries hasSeries:
                    result.Series = hasSeries.SeriesName;
                    break;
                case LiveTvProgram program:
                    result.StartDate = program.StartDate;
                    break;
                case Series series:
                    if (series.Status.HasValue)
                    {
                        result.Status = series.Status.Value.ToString();
                    }

                    break;
                case MusicAlbum album:
                    result.Artists = album.Artists;
                    result.AlbumArtist = album.AlbumArtist;
                    break;
                case Audio song:
                    result.AlbumArtist = song.AlbumArtists?[0];
                    result.Artists = song.Artists;

                    MusicAlbum musicAlbum = song.AlbumEntity;

                    if (musicAlbum != null)
                    {
                        result.Album = musicAlbum.Name;
                        result.AlbumId = musicAlbum.Id;
                    }
                    else
                    {
                        result.Album = song.Album;
                    }

                    break;
            }

            if (!item.ChannelId.Equals(Guid.Empty))
            {
                var channel = _libraryManager.GetItemById(item.ChannelId);
                result.ChannelName = channel?.Name;
            }

            return result;
        }

        private void SetThumbImageInfo(SearchHint hint, BaseItem item)
        {
            var itemWithImage = item.HasImage(ImageType.Thumb) ? item : null;

            if (itemWithImage == null && item is Episode)
            {
                itemWithImage = GetParentWithImage<Series>(item, ImageType.Thumb);
            }

            if (itemWithImage == null)
            {
                itemWithImage = GetParentWithImage<BaseItem>(item, ImageType.Thumb);
            }

            if (itemWithImage != null)
            {
                var tag = _imageProcessor.GetImageCacheTag(itemWithImage, ImageType.Thumb);

                if (tag != null)
                {
                    hint.ThumbImageTag = tag;
                    hint.ThumbImageItemId = itemWithImage.Id.ToString("N", CultureInfo.InvariantCulture);
                }
            }
        }

        private void SetBackdropImageInfo(SearchHint hint, BaseItem item)
        {
            var itemWithImage = (item.HasImage(ImageType.Backdrop) ? item : null)
                ?? GetParentWithImage<BaseItem>(item, ImageType.Backdrop);

            if (itemWithImage != null)
            {
                var tag = _imageProcessor.GetImageCacheTag(itemWithImage, ImageType.Backdrop);

                if (tag != null)
                {
                    hint.BackdropImageTag = tag;
                    hint.BackdropImageItemId = itemWithImage.Id.ToString("N", CultureInfo.InvariantCulture);
                }
            }
        }

        private T? GetParentWithImage<T>(BaseItem item, ImageType type)
            where T : BaseItem
        {
            return item.GetParents().OfType<T>().FirstOrDefault(i => i.HasImage(type));
        }
    }
}