using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Threading;
using System.Threading.Tasks;
using Jellyfin.Plugin.SRFPlay.Api;
using Jellyfin.Plugin.SRFPlay.Services;
using MediaBrowser.Controller.Entities.TV;
using MediaBrowser.Controller.Providers;
using MediaBrowser.Model.Entities;
using MediaBrowser.Model.Providers;
using Microsoft.Extensions.Logging;

namespace Jellyfin.Plugin.SRFPlay.Providers;

/// <summary>
/// Provides metadata for SRF Play episodes.
/// </summary>
public class SRFEpisodeProvider : IRemoteMetadataProvider<Episode, EpisodeInfo>
{
    private readonly ILogger<SRFEpisodeProvider> _logger;
    private readonly ILoggerFactory _loggerFactory;
    private readonly IHttpClientFactory _httpClientFactory;
    private readonly MetadataCache _metadataCache;

    /// <summary>
    /// Initializes a new instance of the <see cref="SRFEpisodeProvider"/> class.
    /// </summary>
    /// <param name="loggerFactory">The logger factory.</param>
    /// <param name="httpClientFactory">The HTTP client factory.</param>
    /// <param name="metadataCache">The metadata cache.</param>
    public SRFEpisodeProvider(
        ILoggerFactory loggerFactory,
        IHttpClientFactory httpClientFactory,
        MetadataCache metadataCache)
    {
        _loggerFactory = loggerFactory;
        _logger = loggerFactory.CreateLogger<SRFEpisodeProvider>();
        _httpClientFactory = httpClientFactory;
        _metadataCache = metadataCache;
    }

    /// <inheritdoc />
    public string Name => "SRF Play";

    /// <inheritdoc />
    public async Task<IEnumerable<RemoteSearchResult>> GetSearchResults(EpisodeInfo searchInfo, CancellationToken cancellationToken)
    {
        var results = new List<RemoteSearchResult>();

        try
        {
            // Check if we have a URN to search with
            if (searchInfo.ProviderIds.TryGetValue("SRF", out var urn) && !string.IsNullOrEmpty(urn))
            {
                _logger.LogDebug("Searching for episode with URN: {Urn}", urn);

                var config = Plugin.Instance?.Configuration;
                if (config == null)
                {
                    return results;
                }

                // Try cache first
                var mediaComposition = _metadataCache.GetMediaComposition(urn, config.CacheDurationMinutes);

                // If not in cache, fetch from API
                if (mediaComposition == null)
                {
                    using var apiClient = new SRFApiClient(_loggerFactory);
                    mediaComposition = await apiClient.GetMediaCompositionByUrnAsync(urn, cancellationToken).ConfigureAwait(false);

                    if (mediaComposition != null)
                    {
                        _metadataCache.SetMediaComposition(urn, mediaComposition);
                    }
                }

                if (mediaComposition?.ChapterList != null && mediaComposition.ChapterList.Count > 0)
                {
                    var chapter = mediaComposition.ChapterList[0];
                    results.Add(new RemoteSearchResult
                    {
                        Name = chapter.Title,
                        Overview = chapter.Description ?? chapter.Lead,
                        ImageUrl = chapter.ImageUrl,
                        SearchProviderName = Name,
                        ProviderIds = new Dictionary<string, string>
                        {
                            { "SRF", chapter.Urn }
                        }
                    });
                }
            }
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error searching for episode: {Name}", searchInfo.Name);
        }

        return results;
    }

    /// <inheritdoc />
    public async Task<MetadataResult<Episode>> GetMetadata(EpisodeInfo info, CancellationToken cancellationToken)
    {
        var result = new MetadataResult<Episode>();

        try
        {
            // Check if we have a URN
            if (!info.ProviderIds.TryGetValue("SRF", out var urn) || string.IsNullOrEmpty(urn))
            {
                _logger.LogDebug("No SRF URN found for episode: {Name}", info.Name);
                return result;
            }

            _logger.LogDebug("Fetching metadata for episode URN: {Urn}", urn);

            var config = Plugin.Instance?.Configuration;
            if (config == null)
            {
                return result;
            }

            // Try cache first
            var mediaComposition = _metadataCache.GetMediaComposition(urn, config.CacheDurationMinutes);

            // If not in cache, fetch from API
            if (mediaComposition == null)
            {
                using var apiClient = new SRFApiClient(_loggerFactory);
                mediaComposition = await apiClient.GetMediaCompositionByUrnAsync(urn, cancellationToken).ConfigureAwait(false);

                if (mediaComposition != null)
                {
                    _metadataCache.SetMediaComposition(urn, mediaComposition);
                }
            }

            if (mediaComposition?.ChapterList == null || mediaComposition.ChapterList.Count == 0)
            {
                _logger.LogWarning("No chapter information found for URN: {Urn}", urn);
                return result;
            }

            // Get the first chapter (main video)
            var chapter = mediaComposition.ChapterList[0];

            result.Item = new Episode
            {
                Name = chapter.Title,
                Overview = chapter.Description ?? chapter.Lead,
                ProviderIds = new Dictionary<string, string>
                {
                    { "SRF", chapter.Urn }
                }
            };

            // Set episode and season numbers if available
            if (chapter.EpisodeNumber.HasValue)
            {
                result.Item.IndexNumber = chapter.EpisodeNumber;
            }

            if (chapter.SeasonNumber.HasValue)
            {
                result.Item.ParentIndexNumber = chapter.SeasonNumber;
            }

            // Set premiere date if available
            if (chapter.Date.HasValue)
            {
                result.Item.PremiereDate = chapter.Date;
            }

            // Set runtime (convert from milliseconds to ticks)
            if (chapter.Duration > 0)
            {
                result.Item.RunTimeTicks = TimeSpan.FromMilliseconds(chapter.Duration).Ticks;
            }

            // Set series information if available
            if (mediaComposition.Show != null)
            {
                result.Item.SeriesName = mediaComposition.Show.Title;

                // Set series provider ID on the episode
                if (!string.IsNullOrEmpty(mediaComposition.Show.Urn))
                {
                    result.Item.SetProviderId("SRF_Series", mediaComposition.Show.Urn);
                }
            }

            result.HasMetadata = true;
            _logger.LogDebug("Successfully fetched metadata for episode: {Title}", chapter.Title);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error fetching metadata for episode: {Name}", info.Name);
        }

        return result;
    }

    /// <inheritdoc />
    public Task<HttpResponseMessage> GetImageResponse(string url, CancellationToken cancellationToken)
    {
        throw new NotImplementedException("Image handling is done by SRFImageProvider");
    }
}