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

using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;
using System.IO;
using Tools.DotNETCommon;

namespace UnrealBuildTool
{
	/// <summary>
	/// Base class for platform-specific project generators
	/// </summary>
	abstract class PlatformProjectGenerator
	{
		/// <summary>
		/// Constructor
		/// </summary>
		/// <param name="Arguments">Command line arguments passed to the project generator</param>
		public PlatformProjectGenerator(CommandLineArguments Arguments)
		{
		}

		/// <summary>
		/// Register the platform with the UEPlatformProjectGenerator class
		/// </summary>
		public abstract IEnumerable<UnrealTargetPlatform> GetPlatforms();

		public virtual void GenerateGameProjectStub(ProjectFileGenerator InGenerator, string InTargetName, string InTargetFilepath, TargetRules InTargetRules,
			List<UnrealTargetPlatform> InPlatforms, List<UnrealTargetConfiguration> InConfigurations)
		{
			// Do nothing
		}

		public virtual void GenerateGameProperties(UnrealTargetConfiguration Configuration, StringBuilder VCProjectFileContent, TargetType TargetType, DirectoryReference RootDirectory, FileReference TargetFilePath)
		{
			// Do nothing
		}

		public virtual bool RequiresVSUserFileGeneration()
		{
			return false;
		}


		///
		///	VisualStudio project generation functions
		///	
		/// <summary>
		/// Whether this build platform has native support for VisualStudio
		/// </summary>
		/// <param name="InPlatform">  The UnrealTargetPlatform being built</param>
		/// <param name="InConfiguration"> The UnrealTargetConfiguration being built</param>
		/// <param name="ProjectFileFormat">The visual studio project file format being generated</param>
		/// <returns>bool    true if native VisualStudio support (or custom VSI) is available</returns>
		public virtual bool HasVisualStudioSupport(UnrealTargetPlatform InPlatform, UnrealTargetConfiguration InConfiguration, VCProjectFileFormat ProjectFileFormat)
		{
			// By default, we assume this is true
			return true;
		}

		/// <summary>
		/// Return the VisualStudio platform name for this build platform
		/// </summary>
		/// <param name="InPlatform">  The UnrealTargetPlatform being built</param>
		/// <param name="InConfiguration"> The UnrealTargetConfiguration being built</param>
		/// <returns>string    The name of the platform that VisualStudio recognizes</returns>
		public virtual string GetVisualStudioPlatformName(UnrealTargetPlatform InPlatform, UnrealTargetConfiguration InConfiguration)
		{
			// By default, return the platform string
			return InPlatform.ToString();
		}

		/// <summary>
		/// Return project configuration settings that must be included before the default props file
		/// </summary>
		/// <param name="Platform">The UnrealTargetPlatform being built</param>
		/// <param name="Configuration">The UnrealTargetConfiguration being built</param>
		/// <param name="ProjectFileBuilder">String builder for the project file</param>
		/// <returns>string    The custom configuration section for the project file; Empty string if it doesn't require one</returns>
		public virtual void GetVisualStudioPreDefaultString(UnrealTargetPlatform Platform, UnrealTargetConfiguration Configuration, StringBuilder ProjectFileBuilder)
		{
		}

		/// <summary>
		/// Return the platform toolset string to write into the project configuration
		/// </summary>
		/// <param name="InPlatform">  The UnrealTargetPlatform being built</param>
		/// <param name="InConfiguration"> The UnrealTargetConfiguration being built</param>
		/// <param name="InProjectFileFormat">The visual studio project file format being generated</param>
		/// <param name="ProjectFileBuilder">String builder for the project file</param>
		/// <returns>string    The custom configuration section for the project file; Empty string if it doesn't require one</returns>
		public virtual void GetVisualStudioPlatformToolsetString(UnrealTargetPlatform InPlatform, UnrealTargetConfiguration InConfiguration, VCProjectFileFormat InProjectFileFormat, StringBuilder ProjectFileBuilder)
		{
		}

		/// <summary>
		/// Return any custom property group lines
		/// </summary>
		/// <param name="InPlatform">  The UnrealTargetPlatform being built</param>
		/// <param name="InProjectFileFormat">The visual studio project file format being generated</param>
		/// <param name="ProjectFileBuilder">String builder for the project file</param>
		/// <returns>string    The custom property import lines for the project file; Empty string if it doesn't require one</returns>
		public virtual void GetAdditionalVisualStudioPropertyGroups(UnrealTargetPlatform InPlatform, VCProjectFileFormat InProjectFileFormat, StringBuilder ProjectFileBuilder)
		{
		}

		/// <summary>
		/// Return any custom property group lines
		/// </summary>
		/// <param name="InPlatform">  The UnrealTargetPlatform being built</param>
		/// <param name="InProjectFileFormat">The visual studio project file format being generated</param>
		/// <returns>string    The platform configuration type.  Defaults to "Makefile" unless overridden</returns>
		public virtual string GetVisualStudioPlatformConfigurationType(UnrealTargetPlatform InPlatform, VCProjectFileFormat InProjectFileFormat)
		{
			return "Makefile";
		}

		/// <summary>
		/// Return any custom paths for VisualStudio this platform requires
		/// This include ReferencePath, LibraryPath, LibraryWPath, IncludePath and ExecutablePath.
		/// </summary>
		/// <param name="InPlatform">The UnrealTargetPlatform being built</param>
		/// <param name="InConfiguration">The configuration being built</param>
		/// <param name="TargetType">The type of target (game or program)</param>
		/// <param name="TargetRulesPath">Path to the .target.cs file</param>
		/// <param name="ProjectFilePath"></param>
		/// <param name="NMakeOutputPath"></param>
		/// <param name="InProjectFileFormat">The visual studio project file format being generated</param>
		/// <param name="ProjectFileBuilder">String builder for the project file</param>
		/// <returns>The custom path lines for the project file; Empty string if it doesn't require one</returns>
		public virtual void GetVisualStudioPathsEntries(UnrealTargetPlatform InPlatform, UnrealTargetConfiguration InConfiguration, TargetType TargetType, FileReference TargetRulesPath, FileReference ProjectFilePath, FileReference NMakeOutputPath, VCProjectFileFormat InProjectFileFormat, StringBuilder ProjectFileBuilder)
		{
			// NOTE: We are intentionally overriding defaults for these paths with empty strings.  We never want Visual Studio's
			//       defaults for these fields to be propagated, since they are version-sensitive paths that may not reflect
			//       the environment that UBT is building in.  We'll set these environment variables ourselves!
			// NOTE: We don't touch 'ExecutablePath' because that would result in Visual Studio clobbering the system "Path"
			//       environment variable
			ProjectFileBuilder.AppendLine("    <IncludePath />");
			ProjectFileBuilder.AppendLine("    <ReferencePath />");
			ProjectFileBuilder.AppendLine("    <LibraryPath />");
			ProjectFileBuilder.AppendLine("    <LibraryWPath />");
			ProjectFileBuilder.AppendLine("    <SourcePath />");
			ProjectFileBuilder.AppendLine("    <ExcludePath />");
		}

		/// <summary>
		/// Return any custom property settings. These will be included in the ImportGroup section
		/// </summary>
		/// <param name="InPlatform">  The UnrealTargetPlatform being built</param>
		/// <param name="ProjectFileBuilder">String builder for the project file</param>
		/// <returns>string    The custom property import lines for the project file; Empty string if it doesn't require one</returns>
		public virtual void GetVisualStudioImportGroupProperties(UnrealTargetPlatform InPlatform, StringBuilder ProjectFileBuilder)
		{
		}

		/// <summary>
		/// Return any custom property settings. These will be included right after Global properties to make values available to all other imports.
		/// </summary>
		/// <param name="InPlatform">  The UnrealTargetPlatform being built</param>
		/// <param name="ProjectFileBuilder">String builder for the project file</param>
		/// <returns>string    The custom property import lines for the project file; Empty string if it doesn't require one</returns>
		public virtual void GetVisualStudioGlobalProperties(UnrealTargetPlatform InPlatform, StringBuilder ProjectFileBuilder)
		{
		}

		/// <summary>
		/// Return any custom target overrides. These will be included last in the project file so they have the opportunity to override any existing settings.
		/// </summary>
		/// <param name="InPlatform">  The UnrealTargetPlatform being built</param>
		/// <param name="InProjectFileFormat">The visual studio project file format being generated</param>
		/// <param name="ProjectFileBuilder">String builder for the project file</param>
		/// <returns>string    The custom property import lines for the project file; Empty string if it doesn't require one</returns>
		public virtual void GetVisualStudioTargetOverrides(UnrealTargetPlatform InPlatform, VCProjectFileFormat InProjectFileFormat, StringBuilder ProjectFileBuilder)
		{
		}

		/// <summary>
		/// Return any custom layout directory sections
		/// </summary>
		/// <param name="InPlatform">The UnrealTargetPlatform being built</param>
		/// <param name="InConfiguration">The configuration being built</param>
		/// <param name="InConditionString"></param>
		/// <param name="TargetType">The type of target (game or program)</param>
		/// <param name="InProjectFileFormat">The visual studio project file format being generated</param>
		/// <param name="NMakeOutputPath"></param>
		/// <param name="ProjectFilePath"></param>
		/// <param name="TargetRulesPath"></param>
		/// <returns>string    The custom property import lines for the project file; Empty string if it doesn't require one</returns>
		public virtual string GetVisualStudioLayoutDirSection(UnrealTargetPlatform InPlatform, UnrealTargetConfiguration InConfiguration, string InConditionString, TargetType TargetType, FileReference TargetRulesPath, FileReference ProjectFilePath, FileReference NMakeOutputPath, VCProjectFileFormat InProjectFileFormat)
		{
			return "";
		}

		/// <summary>
		/// Get the output manifest section, if required
		/// </summary>
		/// <param name="InPlatform">The UnrealTargetPlatform being built</param>
		/// <param name="TargetType">The type of the target being built</param>
		/// <param name="TargetRulesPath">Path to the .target.cs file</param>
		/// <param name="ProjectFilePath">Path to the project file</param>
		/// <param name="InProjectFileFormat">The visual studio project file format being generated</param>
		/// <returns>The output manifest section for the project file; Empty string if it doesn't require one</returns>
		public virtual string GetVisualStudioOutputManifestSection(UnrealTargetPlatform InPlatform, TargetType TargetType, FileReference TargetRulesPath, FileReference ProjectFilePath, VCProjectFileFormat InProjectFileFormat)
		{
			return "";
		}

		/// <summary>
		/// Get whether this platform deploys
		/// </summary>
		/// <returns>bool  true if the 'Deploy' option should be enabled</returns>
		public virtual bool GetVisualStudioDeploymentEnabled(UnrealTargetPlatform InPlatform, UnrealTargetConfiguration InConfiguration)
		{
			return false;
		}

		/// <summary>
		/// Get the text to insert into the user file for the given platform/configuration/target
		/// </summary>
		/// <param name="InPlatform">The platform being added</param>
		/// <param name="InConfiguration">The configuration being added</param>
		/// <param name="InConditionString">The condition string </param>
		/// <param name="InTargetRules">The target rules </param>
		/// <param name="TargetRulesPath">The target rules path</param>
		/// <param name="ProjectFilePath">The project file path</param>
		/// <returns>The string to append to the user file</returns>
		public virtual string GetVisualStudioUserFileStrings(UnrealTargetPlatform InPlatform, UnrealTargetConfiguration InConfiguration,
			string InConditionString, TargetRules InTargetRules, FileReference TargetRulesPath, FileReference ProjectFilePath)
		{
			return "";
		}

		/// <summary>
		/// For Additional Project Property files that need to be written out.  This is currently used only on Android. 
		/// </summary>
		public virtual void WriteAdditionalPropFile()
		{
		}

		/// <summary>
		/// For additional Project files (ex. *PROJECTNAME*-AndroidRun.androidproj.user) that needs to be written out.  This is currently used only on Android. 
		/// </summary>
		/// <param name="ProjectFile">Project file this will be related to</param>
		public virtual void WriteAdditionalProjUserFile(ProjectFile ProjectFile)
		{
		}

		/// <summary>
		/// For additional Project files (ex. *PROJECTNAME*-AndroidRun.androidproj) that needs to be written out.  This is currently used only on Android. 
		/// </summary>
		/// <param name="ProjectFile">Project file this will be related to</param>
		/// <returns>Project file written out, Solution folder it should be put in</returns>
		public virtual Tuple<ProjectFile, string> WriteAdditionalProjFile(ProjectFile ProjectFile)
		{
			return null;
		}

		/// <summary>
		/// Gets the text to insert into the UnrealVS configuration file
		/// </summary>
		public virtual void GetUnrealVSConfigurationEntries( StringBuilder UnrealVSContent )
		{
		}
	}
}