using MediaBrowser.Common.ScheduledTasks;
using MediaBrowser.Controller.Library;
using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using MediaBrowser.Controller;

namespace MediaBrowser.Server.Implementations.ScheduledTasks
{
    /// <summary>
    /// Class PeopleValidationTask
    /// </summary>
    public class PeopleValidationTask : IScheduledTask
    {
        /// <summary>
        /// The _library manager
        /// </summary>
        private readonly ILibraryManager _libraryManager;

        private readonly IServerApplicationHost _appHost;

        /// <summary>
        /// Initializes a new instance of the <see cref="PeopleValidationTask" /> class.
        /// </summary>
        /// <param name="libraryManager">The library manager.</param>
        public PeopleValidationTask(ILibraryManager libraryManager, IServerApplicationHost appHost)
        {
            _libraryManager = libraryManager;
            _appHost = appHost;
        }

        /// <summary>
        /// Creates the triggers that define when the task will run
        /// </summary>
        /// <returns>IEnumerable{BaseTaskTrigger}.</returns>
        public IEnumerable<ITaskTrigger> GetDefaultTriggers()
        {
            // Randomize the default start hour because this operation can really hammer internet metadata providers
            var startHour = new Random(_appHost.SystemId.GetHashCode()).Next(0, 8);

            return new ITaskTrigger[]
                {
                    new DailyTrigger { TimeOfDay = TimeSpan.FromHours(startHour) },
                };
        }

        /// <summary>
        /// Returns the task to be executed
        /// </summary>
        /// <param name="cancellationToken">The cancellation token.</param>
        /// <param name="progress">The progress.</param>
        /// <returns>Task.</returns>
        public Task Execute(CancellationToken cancellationToken, IProgress<double> progress)
        {
            return _libraryManager.ValidatePeople(cancellationToken, progress);
        }

        /// <summary>
        /// Gets the name of the task
        /// </summary>
        /// <value>The name.</value>
        public string Name
        {
            get { return "Refresh people"; }
        }

        /// <summary>
        /// Gets the description.
        /// </summary>
        /// <value>The description.</value>
        public string Description
        {
            get { return "Updates metadata for actors and directors in your media library."; }
        }

        /// <summary>
        /// Gets the category.
        /// </summary>
        /// <value>The category.</value>
        public string Category
        {
            get
            {
                return "Library";
            }
        }
    }
}