using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using MediaBrowser.Controller.Configuration;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.Trickplay;
using MediaBrowser.Model.Entities;
using MediaBrowser.Model.Globalization;
using MediaBrowser.Model.Tasks;
using Microsoft.Extensions.Logging;

namespace MediaBrowser.Providers.Trickplay;

/// <summary>
/// Class TrickplayImagesTask.
/// </summary>
public class TrickplayImagesTask : IScheduledTask
{
    private readonly ILogger<TrickplayImagesTask> _logger;
    private readonly ILibraryManager _libraryManager;
    private readonly ILocalizationManager _localization;
    private readonly ITrickplayManager _trickplayManager;

    /// <summary>
    /// Initializes a new instance of the <see cref="TrickplayImagesTask"/> class.
    /// </summary>
    /// <param name="logger">The logger.</param>
    /// <param name="libraryManager">The library manager.</param>
    /// <param name="localization">The localization manager.</param>
    /// <param name="trickplayManager">The trickplay manager.</param>
    public TrickplayImagesTask(
        ILogger<TrickplayImagesTask> logger,
        ILibraryManager libraryManager,
        ILocalizationManager localization,
        ITrickplayManager trickplayManager)
    {
        _libraryManager = libraryManager;
        _logger = logger;
        _localization = localization;
        _trickplayManager = trickplayManager;
    }

    /// <inheritdoc />
    public string Name => _localization.GetLocalizedString("TaskRefreshTrickplayImages");

    /// <inheritdoc />
    public string Description => _localization.GetLocalizedString("TaskRefreshTrickplayImagesDescription");

    /// <inheritdoc />
    public string Key => "RefreshTrickplayImages";

    /// <inheritdoc />
    public string Category => _localization.GetLocalizedString("TasksLibraryCategory");

    /// <inheritdoc />
    public IEnumerable<TaskTriggerInfo> GetDefaultTriggers()
    {
        return new[]
        {
            new TaskTriggerInfo
            {
                Type = TaskTriggerInfo.TriggerDaily,
                TimeOfDayTicks = TimeSpan.FromHours(3).Ticks
            }
        };
    }

    /// <inheritdoc />
    public async Task ExecuteAsync(IProgress<double> progress, CancellationToken cancellationToken)
    {
        var items = _libraryManager.GetItemList(new InternalItemsQuery
        {
            MediaTypes = new[] { MediaType.Video },
            IsVirtualItem = false,
            IsFolder = false,
            Recursive = true
        }).OfType<Video>().ToList();

        var numComplete = 0;

        foreach (var item in items)
        {
            try
            {
                cancellationToken.ThrowIfCancellationRequested();
                await _trickplayManager.RefreshTrickplayDataAsync(item, false, cancellationToken).ConfigureAwait(false);
            }
            catch (OperationCanceledException)
            {
                break;
            }
            catch (Exception ex)
            {
                _logger.LogError("Error creating trickplay files for {ItemName}: {Msg}", item.Name, ex);
            }

            numComplete++;
            double percent = numComplete;
            percent /= items.Count;
            percent *= 100;

            progress.Report(percent);
        }
    }
}