// Copyright (c) AlphaSierraPapa for the SharpDevelop Team
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
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// to whom the Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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using System.CodeDom.Compiler;
using System.IO;
using System.Linq;
using System.Runtime.CompilerServices;
using ICSharpCode.Decompiler.Tests.Helpers;
using NUnit.Framework;

namespace ICSharpCode.Decompiler.Tests
{
	[TestFixture]
	public class CorrectnessTestRunner
	{
		const string TestCasePath = @"../../Tests/TestCases/Correctness";

		[Test]
		public void AllFilesHaveTests()
		{
			var testNames = typeof(CorrectnessTestRunner).GetMethods()
				.Where(m => m.GetCustomAttributes(typeof(TestAttribute), false).Any())
				.Select(m => m.Name)
				.ToArray();
			foreach (var file in new DirectoryInfo(TestCasePath).EnumerateFiles()) {
				if (file.Extension == ".txt" || file.Extension == ".exe")
					continue;
				var testName = Path.GetFileNameWithoutExtension(file.Name);
				Assert.Contains(testName, testNames);
			}
		}

		static readonly CompilerOptions[] defaultOptions =
		{
			CompilerOptions.None,
			CompilerOptions.Optimize,
			CompilerOptions.UseRoslyn,
			CompilerOptions.Optimize | CompilerOptions.UseRoslyn
		};

		[Test]
		public void Comparisons([ValueSource("defaultOptions")] CompilerOptions options)
		{
			RunCS(options: options);
		}

		[Test]
		public void Conversions([ValueSource("defaultOptions")] CompilerOptions options)
		{
			RunCS(options: options);
		}

		[Test]
		public void HelloWorld([ValueSource("defaultOptions")] CompilerOptions options)
		{
			RunCS(options: options);
		}

		[Test]
		public void ControlFlow([ValueSource("defaultOptions")] CompilerOptions options)
		{
			RunCS(options: options);
		}

		[Test]
		public void CompoundAssignment([ValueSource("defaultOptions")] CompilerOptions options)
		{
			RunCS(options: options);
		}

		[Test]
		public void PropertiesAndEvents([ValueSource("defaultOptions")] CompilerOptions options)
		{
			RunCS(options: options);
		}

		[Test]
		public void Switch([ValueSource("defaultOptions")] CompilerOptions options)
		{
			RunCS(options: options);
		}

		[Test]
		public void Generics([ValueSource("defaultOptions")] CompilerOptions options)
		{
			RunCS(options: options);
		}

		[Test]
		public void ValueTypeCall([ValueSource("defaultOptions")] CompilerOptions options)
		{
			RunCS(options: options);
		}

		[Test]
		public void InitializerTests([ValueSource("defaultOptions")] CompilerOptions options)
		{
			RunCS(options: options);
		}

		[Test]
		public void DecimalFields([ValueSource("defaultOptions")] CompilerOptions options)
		{
			RunCS(options: options);
		}

		[Test]
		public void UndocumentedExpressions([ValueSource("defaultOptions")] CompilerOptions options)
		{
			RunCS(options: options);
		}

		[Test]
		public void MemberLookup([ValueSource("defaultOptions")] CompilerOptions options)
		{
			RunCS(options: options);
		}

		[Test]
		public void BitNot()
		{
			RunIL("BitNot.il");
			RunIL("BitNot.il", CompilerOptions.UseDebug | CompilerOptions.Force32Bit, AssemblerOptions.Force32Bit);
		}

		[Test]
		public void UnsafeCode([ValueSource("defaultOptions")] CompilerOptions options)
		{
			RunCS(options: options);
		}

		[Test]
		public void ConditionalAttr([ValueSource("defaultOptions")] CompilerOptions options)
		{
			RunCS(options: options);
		}

		void RunCS([CallerMemberName] string testName = null, CompilerOptions options = CompilerOptions.UseDebug)
		{
			string testFileName = testName + ".cs";
			CompilerResults outputFile = null, decompiledOutputFile = null;

			try {
				outputFile = Tester.CompileCSharp(Path.Combine(TestCasePath, testFileName), options);
				string decompiledCodeFile = Tester.DecompileCSharp(outputFile.PathToAssembly);
				decompiledOutputFile = Tester.CompileCSharp(decompiledCodeFile, options);
				
				Tester.RunAndCompareOutput(testFileName, outputFile.PathToAssembly, decompiledOutputFile.PathToAssembly, decompiledCodeFile);
				
				File.Delete(decompiledCodeFile);
				File.Delete(outputFile.PathToAssembly);
				File.Delete(decompiledOutputFile.PathToAssembly);
			} finally {
				if (outputFile != null)
					outputFile.TempFiles.Delete();
				if (decompiledOutputFile != null)
					decompiledOutputFile.TempFiles.Delete();
			}
		}
		
		void RunIL(string testFileName, CompilerOptions options = CompilerOptions.UseDebug, AssemblerOptions asmOptions = AssemblerOptions.None)
		{
			string outputFile = null;
			CompilerResults decompiledOutputFile = null;

			try {
				outputFile = Tester.AssembleIL(Path.Combine(TestCasePath, testFileName), asmOptions);
				string decompiledCodeFile = Tester.DecompileCSharp(outputFile);
				decompiledOutputFile = Tester.CompileCSharp(decompiledCodeFile, options);
				
				Tester.RunAndCompareOutput(testFileName, outputFile, decompiledOutputFile.PathToAssembly, decompiledCodeFile);
				
				File.Delete(decompiledCodeFile);
				File.Delete(decompiledOutputFile.PathToAssembly);
			} finally {
				if (decompiledOutputFile != null)
					decompiledOutputFile.TempFiles.Delete();
			}
		}
	}
}