// Copyright 1998-2019 Epic Games, Inc. All Rights Reserved.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tools.DotNETCommon;

namespace UnrealBuildTool
{
	/// <summary>
	/// Validates the various platforms to determine if they are ready for building
	/// </summary>
	[ToolMode("ValidatePlatforms", ToolModeOptions.XmlConfig | ToolModeOptions.BuildPlatformsForValidation | ToolModeOptions.SingleInstance)]
	class ValidatePlatformsMode : ToolMode
	{
		/// <summary>
		/// Platforms to validate
		/// </summary>
		[CommandLine("-Platforms=", ListSeparator = '+')]
		HashSet<UnrealTargetPlatform> Platforms = new HashSet<UnrealTargetPlatform>();

		/// <summary>
		/// Whether to validate all platforms
		/// </summary>
		[CommandLine("-AllPlatforms")]
		bool bAllPlatforms = false;

		/// <summary>
		/// Executes the tool with the given arguments
		/// </summary>
		/// <param name="Arguments">Command line arguments</param>
		/// <returns>Exit code</returns>
		public override int Execute(CommandLineArguments Arguments)
		{
			// Output a message if there are any arguments that are still unused
			Arguments.ApplyTo(this);
			Arguments.CheckAllArgumentsUsed();

			// If the -AllPlatforms argument is specified, add all the known platforms into the list
			if(bAllPlatforms)
			{
				Platforms.UnionWith(Enum.GetValues(typeof(UnrealTargetPlatform)).OfType<UnrealTargetPlatform>().Where(x => x != UnrealTargetPlatform.Unknown));
			}

			// Output a line for each registered platform
			foreach (UnrealTargetPlatform Platform in Platforms)
			{
				UEBuildPlatform BuildPlatform = UEBuildPlatform.GetBuildPlatform(Platform, true);
				if (BuildPlatform != null && BuildPlatform.HasRequiredSDKsInstalled() == SDKStatus.Valid)
				{
					Log.TraceInformation("##PlatformValidate: {0} VALID", Platform.ToString());
				}
				else
				{
					Log.TraceInformation("##PlatformValidate: {0} INVALID", Platform.ToString());
				}
			} 
			return 0;
		}
	}
}