// Copyright Epic Games, Inc. All Rights Reserved.

using System;
using System.Collections.Generic;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using System.Xml;
using AutomationTool;
using EpicGames.Core;

namespace AutomationTool.Tasks
{
	/// <summary>
	/// Parameters for a wait task
	/// </summary>
	public class WaitTaskParameters
	{
		/// <summary>
		/// Number of seconds to wait.
		/// </summary>
		[TaskParameter]
		public int Seconds;
	}

	/// <summary>
	/// Waits a defined number of seconds.
	/// </summary>
	[TaskElement("Wait", typeof(WaitTaskParameters))]
	public class WaitTask : BgTaskImpl
	{
		/// <summary>
		/// Parameters for this task
		/// </summary>
		WaitTaskParameters Parameters;

		/// <summary>
		/// Construct a wait task
		/// </summary>
		/// <param name="InParameters">Parameters for the task</param>
		public WaitTask(WaitTaskParameters InParameters)
		{
			Parameters = InParameters;
		}

		/// <summary>
		/// Execute the task.
		/// </summary>
		/// <param name="Job">Information about the current job</param>
		/// <param name="BuildProducts">Set of build products produced by this node.</param>
		/// <param name="TagNameToFileSet">Mapping from tag names to the set of files they include</param>
		public override async Task ExecuteAsync(JobContext Job, HashSet<FileReference> BuildProducts, Dictionary<string, HashSet<FileReference>> TagNameToFileSet)
		{
			await Task.Delay(TimeSpan.FromSeconds(Parameters.Seconds));
		}

		/// <summary>
		/// Output this task out to an XML writer.
		/// </summary>
		public override void Write(XmlWriter Writer)
		{
			Write(Writer, Parameters);
		}

		/// <summary>
		/// Find all the tags which are used as inputs to this task
		/// </summary>
		/// <returns>The tag names which are read by this task</returns>
		public override IEnumerable<string> FindConsumedTagNames()
		{
			yield break;
		}

		/// <summary>
		/// Find all the tags which are modified by this task
		/// </summary>
		/// <returns>The tag names which are modified by this task</returns>
		public override IEnumerable<string> FindProducedTagNames()
		{
			yield break;
		}
	}
}