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// 
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// 
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// 
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// 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;
using System.CodeDom.Compiler;
using System.IO;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Threading.Tasks;

using ICSharpCode.Decompiler.Tests.Helpers;

using NUnit.Framework;

namespace ICSharpCode.Decompiler.Tests
{
	[TestFixture, Parallelizable(ParallelScope.All)]
	public class UglyTestRunner
	{
		static readonly string TestCasePath = Tester.TestCasePath + "/Ugly";

		[Test]
		public void AllFilesHaveTests()
		{
			var testNames = GetType().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.Equals(".il", StringComparison.OrdinalIgnoreCase)
					|| file.Extension.Equals(".cs", StringComparison.OrdinalIgnoreCase))
				{
					var testName = file.Name.Split('.')[0];
					Assert.Contains(testName, testNames);
				}
			}
		}

		static readonly CompilerOptions[] noRoslynOptions =
		{
			CompilerOptions.None,
			CompilerOptions.Optimize
		};

		static readonly CompilerOptions[] roslynOnlyOptions =
		{
			CompilerOptions.UseRoslynLatest | CompilerOptions.TargetNet40,
			CompilerOptions.Optimize | CompilerOptions.UseRoslynLatest | CompilerOptions.TargetNet40,
			CompilerOptions.UseRoslynLatest,
			CompilerOptions.Optimize | CompilerOptions.UseRoslynLatest,
		};

		static readonly CompilerOptions[] defaultOptions =
		{
			CompilerOptions.None,
			CompilerOptions.Optimize,
			CompilerOptions.UseRoslynLatest | CompilerOptions.TargetNet40,
			CompilerOptions.Optimize | CompilerOptions.UseRoslynLatest | CompilerOptions.TargetNet40,
			CompilerOptions.UseRoslynLatest,
			CompilerOptions.Optimize | CompilerOptions.UseRoslynLatest,
		};

		[Test]
		public async Task NoArrayInitializers([ValueSource(nameof(roslynOnlyOptions))] CompilerOptions cscOptions)
		{
			await RunForLibrary(cscOptions: cscOptions, decompilerSettings: new DecompilerSettings(CSharp.LanguageVersion.CSharp1) {
				ArrayInitializers = false
			});
		}

		[Test]
		public async Task NoDecimalConstants([ValueSource(nameof(roslynOnlyOptions))] CompilerOptions cscOptions)
		{
			await RunForLibrary(cscOptions: cscOptions, decompilerSettings: new DecompilerSettings(CSharp.LanguageVersion.CSharp1) {
				DecimalConstants = false
			});
		}

		[Test]
		public async Task NoExtensionMethods([ValueSource(nameof(roslynOnlyOptions))] CompilerOptions cscOptions)
		{
			await RunForLibrary(cscOptions: cscOptions, decompilerSettings: new DecompilerSettings(CSharp.LanguageVersion.CSharp9_0) {
				ExtensionMethods = false
			});
		}

		[Test]
		public async Task NoForEachStatement([ValueSource(nameof(defaultOptions))] CompilerOptions cscOptions)
		{
			await RunForLibrary(cscOptions: cscOptions, decompilerSettings: new DecompilerSettings(CSharp.LanguageVersion.CSharp1) {
				ForEachStatement = false,
				UseEnhancedUsing = false,
			});
		}

		[Test]
		public async Task NoLocalFunctions([ValueSource(nameof(roslynOnlyOptions))] CompilerOptions cscOptions)
		{
			await RunForLibrary(cscOptions: cscOptions, decompilerSettings: new DecompilerSettings(CSharp.LanguageVersion.CSharp1));
		}

		[Test]
		public async Task NoPropertiesAndEvents([ValueSource(nameof(defaultOptions))] CompilerOptions cscOptions)
		{
			await RunForLibrary(cscOptions: cscOptions, decompilerSettings: new DecompilerSettings(CSharp.LanguageVersion.CSharp1) {
				AutomaticEvents = false,
				AutomaticProperties = false,
			});
		}

		[Test]
		public async Task AggressiveScalarReplacementOfAggregates([ValueSource(nameof(roslynOnlyOptions))] CompilerOptions cscOptions)
		{
			await RunForLibrary(cscOptions: cscOptions, decompilerSettings: new DecompilerSettings(CSharp.LanguageVersion.CSharp3) {
				AggressiveScalarReplacementOfAggregates = true
			});
		}

		async Task RunForLibrary([CallerMemberName] string testName = null, AssemblerOptions asmOptions = AssemblerOptions.None, CompilerOptions cscOptions = CompilerOptions.None, DecompilerSettings decompilerSettings = null)
		{
			await Run(testName, asmOptions | AssemblerOptions.Library, cscOptions | CompilerOptions.Library, decompilerSettings);
		}

		async Task Run([CallerMemberName] string testName = null, AssemblerOptions asmOptions = AssemblerOptions.None, CompilerOptions cscOptions = CompilerOptions.None, DecompilerSettings decompilerSettings = null)
		{
			var ilFile = Path.Combine(TestCasePath, testName) + Tester.GetSuffix(cscOptions) + ".il";
			var csFile = Path.Combine(TestCasePath, testName + ".cs");
			var expectedFile = Path.Combine(TestCasePath, testName + ".Expected.cs");

			if (!File.Exists(ilFile))
			{
				// re-create .il file if necessary
				CompilerResults output = null;
				try
				{
					output = await Tester.CompileCSharp(csFile, cscOptions).ConfigureAwait(false);
					await Tester.Disassemble(output.PathToAssembly, ilFile, asmOptions).ConfigureAwait(false);
				}
				finally
				{
					if (output != null)
						output.DeleteTempFiles();
				}
			}

			var executable = await Tester.AssembleIL(ilFile, asmOptions).ConfigureAwait(false);
			var decompiled = await Tester.DecompileCSharp(executable, decompilerSettings).ConfigureAwait(false);

			CodeAssert.FilesAreEqual(expectedFile, decompiled, Tester.GetPreprocessorSymbols(cscOptions).ToArray());
			Tester.RepeatOnIOError(() => File.Delete(decompiled));
		}
	}
}