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// 
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// 
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using System;
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 VBPrettyTestRunner
	{
		static readonly string TestCasePath = Tester.TestCasePath + "/VBPretty";

		[Test]
		public void AllFilesHaveTests()
		{
			var testNames = typeof(VBPrettyTestRunner).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(".vb", StringComparison.OrdinalIgnoreCase))
				{
					var testName = file.Name.Split('.')[0];
					Assert.Contains(testName, testNames);
					Assert.IsTrue(File.Exists(Path.Combine(TestCasePath, testName + ".cs")));
				}
			}
		}

		static readonly CompilerOptions[] defaultOptions =
		{
			CompilerOptions.None,
			CompilerOptions.Optimize,
			CompilerOptions.UseRoslyn1_3_2 | CompilerOptions.TargetNet40,
			CompilerOptions.Optimize | CompilerOptions.UseRoslyn1_3_2 | CompilerOptions.TargetNet40,
			CompilerOptions.UseRoslyn2_10_0 | CompilerOptions.TargetNet40,
			CompilerOptions.Optimize | CompilerOptions.UseRoslyn2_10_0 | CompilerOptions.TargetNet40,
			CompilerOptions.UseRoslyn3_11_0 | CompilerOptions.TargetNet40,
			CompilerOptions.Optimize | CompilerOptions.UseRoslyn3_11_0 | CompilerOptions.TargetNet40,
			CompilerOptions.UseRoslynLatest | CompilerOptions.TargetNet40,
			CompilerOptions.Optimize | CompilerOptions.UseRoslynLatest | CompilerOptions.TargetNet40,
			CompilerOptions.UseRoslyn1_3_2,
			CompilerOptions.Optimize | CompilerOptions.UseRoslyn1_3_2,
			CompilerOptions.UseRoslyn2_10_0,
			CompilerOptions.Optimize | CompilerOptions.UseRoslyn2_10_0,
			CompilerOptions.UseRoslynLatest,
			CompilerOptions.Optimize | CompilerOptions.UseRoslynLatest,
		};

		static readonly CompilerOptions[] roslynOnlyOptions =
		{
			CompilerOptions.UseRoslyn1_3_2 | CompilerOptions.TargetNet40,
			CompilerOptions.Optimize | CompilerOptions.UseRoslyn1_3_2 | CompilerOptions.TargetNet40,
			CompilerOptions.UseRoslyn2_10_0 | CompilerOptions.TargetNet40,
			CompilerOptions.Optimize | CompilerOptions.UseRoslyn2_10_0 | CompilerOptions.TargetNet40,
			CompilerOptions.UseRoslyn3_11_0 | CompilerOptions.TargetNet40,
			CompilerOptions.Optimize | CompilerOptions.UseRoslyn3_11_0 | CompilerOptions.TargetNet40,
			CompilerOptions.UseRoslynLatest | CompilerOptions.TargetNet40,
			CompilerOptions.Optimize | CompilerOptions.UseRoslynLatest | CompilerOptions.TargetNet40,
			CompilerOptions.UseRoslyn1_3_2,
			CompilerOptions.Optimize | CompilerOptions.UseRoslyn1_3_2,
			CompilerOptions.UseRoslyn2_10_0,
			CompilerOptions.Optimize | CompilerOptions.UseRoslyn2_10_0,
			CompilerOptions.UseRoslynLatest,
			CompilerOptions.Optimize | CompilerOptions.UseRoslynLatest,
		};

		[Test, Ignore("Implement VB async/await")]
		public async Task Async([ValueSource(nameof(defaultOptions))] CompilerOptions options)
		{
			await Run(options: options);
		}

		[Test] // TODO: legacy VB compound assign
		public async Task VBCompoundAssign([ValueSource(nameof(roslynOnlyOptions))] CompilerOptions options)
		{
			await Run(options: options | CompilerOptions.Library);
		}

		[Test]
		public async Task Select([ValueSource(nameof(defaultOptions))] CompilerOptions options)
		{
			await Run(options: options | CompilerOptions.Library);
		}

		[Test]
		public async Task Issue1906([ValueSource(nameof(defaultOptions))] CompilerOptions options)
		{
			await Run(options: options | CompilerOptions.Library);
		}

		[Test]
		public async Task Issue2192([ValueSource(nameof(defaultOptions))] CompilerOptions options)
		{
			await Run(options: options | CompilerOptions.Library);
		}

		[Test]
		public async Task VBPropertiesTest([ValueSource(nameof(defaultOptions))] CompilerOptions options)
		{
			await Run(options: options | CompilerOptions.Library);
		}

		async Task Run([CallerMemberName] string testName = null, CompilerOptions options = CompilerOptions.UseDebug, DecompilerSettings settings = null)
		{
			var vbFile = Path.Combine(TestCasePath, testName + ".vb");
			var csFile = Path.Combine(TestCasePath, testName + ".cs");
			var exeFile = Path.Combine(TestCasePath, testName) + Tester.GetSuffix(options) + ".exe";
			if (options.HasFlag(CompilerOptions.Library))
			{
				exeFile = Path.ChangeExtension(exeFile, ".dll");
			}

			var executable = await Tester.CompileVB(vbFile, options | CompilerOptions.ReferenceVisualBasic, exeFile).ConfigureAwait(false);
			var decompiled = await Tester.DecompileCSharp(executable.PathToAssembly, settings).ConfigureAwait(false);

			CodeAssert.FilesAreEqual(csFile, decompiled, Tester.GetPreprocessorSymbols(options).ToArray());
		}
	}
}