using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using MediaBrowser.Controller.Library;
using MediaBrowser.Model.Tasks;
using Microsoft.Extensions.Logging;

namespace ConfusedPolarBear.Plugin.IntroSkipper;

/// <summary>
/// Analyze all television episodes for introduction sequences.
/// </summary>
public class DetectIntroductionsTask : IScheduledTask
{
    private readonly ILogger<DetectIntroductionsTask> _logger;

    private readonly ILoggerFactory _loggerFactory;

    private readonly ILibraryManager _libraryManager;

    /// <summary>
    /// Initializes a new instance of the <see cref="DetectIntroductionsTask"/> class.
    /// </summary>
    /// <param name="loggerFactory">Logger factory.</param>
    /// <param name="libraryManager">Library manager.</param>
    /// <param name="logger">Logger.</param>
    public DetectIntroductionsTask(
        ILogger<DetectIntroductionsTask> logger,
        ILoggerFactory loggerFactory,
        ILibraryManager libraryManager)
    {
        _logger = logger;
        _loggerFactory = loggerFactory;
        _libraryManager = libraryManager;
    }

    /// <summary>
    /// Gets the task name.
    /// </summary>
    public string Name => "Detect Introductions";

    /// <summary>
    /// Gets the task category.
    /// </summary>
    public string Category => "Intro Skipper";

    /// <summary>
    /// Gets the task description.
    /// </summary>
    public string Description => "Analyzes the audio of all television episodes to find introduction sequences.";

    /// <summary>
    /// Gets the task key.
    /// </summary>
    public string Key => "CPBIntroSkipperDetectIntroductions";

    /// <summary>
    /// Analyze all episodes in the queue. Only one instance of this task should be run at a time.
    /// </summary>
    /// <param name="progress">Task progress.</param>
    /// <param name="cancellationToken">Cancellation token.</param>
    /// <returns>Task.</returns>
    public Task ExecuteAsync(IProgress<double> progress, CancellationToken cancellationToken)
    {
        if (_libraryManager is null)
        {
            throw new InvalidOperationException("Library manager was null");
        }

        // Wait for running analyzer
        if (Plugin.Instance!.AnalyzerTaskIsRunning)
        {
            _logger.LogInformation("Other running Analyzer Task detected. Wait...");
            using (var timer = new Timer(_ => { }, null, Timeout.InfiniteTimeSpan, Timeout.InfiniteTimeSpan))
            {
                try
                {
                    void DisposeTimerOnCancellation() => timer.Dispose();
                    cancellationToken.Register(DisposeTimerOnCancellation);
                    while (Plugin.Instance!.AnalyzerTaskIsRunning && !cancellationToken.IsCancellationRequested)
                    {
                        timer.Change(TimeSpan.FromMilliseconds(20000), Timeout.InfiniteTimeSpan); // Adjust delay
                    }
                }
                catch (OperationCanceledException)
                {
                    return Task.CompletedTask;
                }
            }

            if (!cancellationToken.IsCancellationRequested) // Check cancellation again before logging
            {
                _logger.LogInformation("No other Task active. Run Analyzer Task");
            }
            else
            {
                _logger.LogInformation("Task was canceled");
                return Task.CompletedTask;
            }
        }

        Plugin.Instance!.AnalyzerTaskIsRunning = true;

        var baseAnalyzer = new BaseItemAnalyzerTask(
            AnalysisMode.Introduction,
            _loggerFactory.CreateLogger<DetectIntroductionsTask>(),
            _loggerFactory,
            _libraryManager);

        baseAnalyzer.AnalyzeItems(progress, cancellationToken);

        Plugin.Instance!.AnalyzerTaskIsRunning = false;

        return Task.CompletedTask;
    }

    /// <summary>
    /// Get task triggers.
    /// </summary>
    /// <returns>Task triggers.</returns>
    public IEnumerable<TaskTriggerInfo> GetDefaultTriggers()
    {
        return new[]
        {
            new TaskTriggerInfo
            {
                Type = TaskTriggerInfo.TriggerDaily,
                TimeOfDayTicks = TimeSpan.FromHours(0).Ticks
            }
        };
    }
}