// Copyright (c) 2010-2013 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
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// 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
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

using System;
using System.Collections.Generic;
using System.Linq;

using ICSharpCode.Decompiler.TypeSystem;
using ICSharpCode.Decompiler.TypeSystem.Implementation;

using NUnit.Framework;

namespace ICSharpCode.Decompiler.Tests.TypeSystem
{
	[TestFixture]
	public unsafe class ReflectionHelperTests
	{
		ICompilation compilation = new SimpleCompilation(TypeSystemLoaderTests.Mscorlib);

		void TestFindType(Type type)
		{
			IType t = compilation.FindType(type);
			Assert.That(t, Is.Not.Null, type.FullName);
			Assert.That(t.ReflectionName, Is.EqualTo(type.FullName));
		}

		[Test]
		public void TestGetInnerClass()
		{
			TestFindType(typeof(Environment.SpecialFolder));
		}

		[Test]
		public void TestGetGenericClass1()
		{
			TestFindType(typeof(Action<>));
		}

		[Test]
		public void TestGetGenericClass2()
		{
			TestFindType(typeof(Action<,>));
		}

		[Test]
		public void TestGetInnerClassInGenericClass1()
		{
			TestFindType(typeof(Dictionary<,>.ValueCollection));
		}

		[Test]
		public void TestGetInnerClassInGenericClass2()
		{
			TestFindType(typeof(Dictionary<,>.ValueCollection.Enumerator));
		}

		[Test]
		public void TestFindTypeReflectionNameInnerClass()
		{
			Assert.That(compilation.FindType(typeof(Environment.SpecialFolder)).ReflectionName, Is.EqualTo("System.Environment+SpecialFolder"));
		}

		[Test]
		public void TestFindTypeReflectionNameUnboundGenericClass()
		{
			Assert.That(compilation.FindType(typeof(Action<>)).ReflectionName, Is.EqualTo("System.Action`1"));
			Assert.That(compilation.FindType(typeof(Action<,>)).ReflectionName, Is.EqualTo("System.Action`2"));
		}

		[Test]
		public void TestFindTypeReflectionNameBoundGenericClass()
		{
			Assert.That(compilation.FindType(typeof(Action<string>)).ReflectionName, Is.EqualTo("System.Action`1[[System.String]]"));
			Assert.That(compilation.FindType(typeof(Action<int, short>)).ReflectionName, Is.EqualTo("System.Action`2[[System.Int32],[System.Int16]]"));
		}


		[Test]
		public void TestFindTypeReflectionNameNullableType()
		{
			Assert.That(compilation.FindType(typeof(int?)).ReflectionName, Is.EqualTo("System.Nullable`1[[System.Int32]]"));
		}

		[Test]
		public void TestFindTypeReflectionNameInnerClassInUnboundGenericType()
		{
			Assert.That(compilation.FindType(typeof(Dictionary<,>.ValueCollection)).ReflectionName, Is.EqualTo("System.Collections.Generic.Dictionary`2+ValueCollection"));
		}

		[Test]
		public void TestFindTypeReflectionNameInnerClassInBoundGenericType()
		{
			Assert.That(compilation.FindType(typeof(Dictionary<string, int>.KeyCollection)).ReflectionName, Is.EqualTo("System.Collections.Generic.Dictionary`2+KeyCollection[[System.String],[System.Int32]]"));
		}

		[Test]
		public void TestFindTypeReflectionNameArrayType()
		{
			Assert.That(compilation.FindType(typeof(int[])).ReflectionName, Is.EqualTo(typeof(int[]).FullName));
		}

		[Test]
		public void TestFindTypeReflectionNameMultidimensionalArrayType()
		{
			Assert.That(compilation.FindType(typeof(int[,])).ReflectionName, Is.EqualTo(typeof(int[,]).FullName));
		}

		[Test]
		public void TestFindTypeReflectionNameJaggedMultidimensionalArrayType()
		{
			Assert.That(compilation.FindType(typeof(int[,][,,])).ReflectionName, Is.EqualTo(typeof(int[,][,,]).FullName));
		}

		[Test]
		public void TestFindTypeReflectionNamePointerType()
		{
			Assert.That(compilation.FindType(typeof(int*)).ReflectionName, Is.EqualTo(typeof(int*).FullName));
		}

		[Test]
		public void TestFindTypeReflectionNameByReferenceType()
		{
			Assert.That(compilation.FindType(typeof(int).MakeByRefType()).ReflectionName, Is.EqualTo(typeof(int).MakeByRefType().FullName));
		}

		[Test]
		public void ParseReflectionName()
		{
			var context = new SimpleTypeResolveContext(compilation.MainModule);
			Assert.That(ReflectionHelper.ParseReflectionName("System.Int32", context).ReflectionName, Is.EqualTo("System.Int32"));
			Assert.That(ReflectionHelper.ParseReflectionName("System.Int32&", context).ReflectionName, Is.EqualTo("System.Int32&"));
			Assert.That(ReflectionHelper.ParseReflectionName("System.Int32*&", context).ReflectionName, Is.EqualTo("System.Int32*&"));
			Assert.That(ReflectionHelper.ParseReflectionName(typeof(int).AssemblyQualifiedName, context).ReflectionName, Is.EqualTo("System.Int32"));
			Assert.That(ReflectionHelper.ParseReflectionName("System.Action`1[[System.String]]", context).ReflectionName, Is.EqualTo("System.Action`1[[System.String]]"));
			Assert.That(ReflectionHelper.ParseReflectionName("System.Action`1[[System.String, mscorlib]]", context).ReflectionName, Is.EqualTo("System.Action`1[[System.String]]"));
			Assert.That(ReflectionHelper.ParseReflectionName(typeof(int[,][,,]).AssemblyQualifiedName, context).ReflectionName, Is.EqualTo("System.Int32[,,][,]"));
			Assert.That(ReflectionHelper.ParseReflectionName("System.Environment+SpecialFolder", context).ReflectionName, Is.EqualTo("System.Environment+SpecialFolder"));
		}

		[Test]
		public void ParseOpenGenericReflectionName()
		{
			IType converter = ReflectionHelper.ParseReflectionName("System.Converter`2[[`0],[``0]]", new SimpleTypeResolveContext(compilation.MainModule));
			Assert.That(converter.ReflectionName, Is.EqualTo("System.Converter`2[[`0],[``0]]"));
			IMethod convertAll = compilation.FindType(typeof(List<>)).GetMethods(m => m.Name == "ConvertAll").Single();
			IType converter2 = ReflectionHelper.ParseReflectionName("System.Converter`2[[`0],[``0]]", new SimpleTypeResolveContext(convertAll));
			Assert.That(converter2.ReflectionName, Is.EqualTo("System.Converter`2[[`0],[``0]]"));
		}

		[Test]
		public void ArrayOfTypeParameter()
		{
			var context = new SimpleTypeResolveContext(compilation.MainModule);
			Assert.That(ReflectionHelper.ParseReflectionName("`0[,]", context).ReflectionName, Is.EqualTo("`0[,]"));
		}

		[Test]
		public void ParseNullReflectionName()
		{
			var context = new SimpleTypeResolveContext(compilation.MainModule);
			Assert.Throws<ArgumentNullException>(() => ReflectionHelper.ParseReflectionName(null, context));
		}

		[Test]
		public void ParseInvalidReflectionName1()
		{
			var context = new SimpleTypeResolveContext(compilation.MainModule);
			Assert.Throws<ReflectionNameParseException>(() => ReflectionHelper.ParseReflectionName(string.Empty, context));
		}

		[Test]
		public void ParseInvalidReflectionName2()
		{
			var context = new SimpleTypeResolveContext(compilation.MainModule);
			Assert.That(ReflectionHelper.ParseReflectionName("`", context).ReflectionName, Is.EqualTo("`"));
		}

		[Test]
		public void ParseInvalidReflectionName3()
		{
			var context = new SimpleTypeResolveContext(compilation.MainModule);
			Assert.That(ReflectionHelper.ParseReflectionName("``", context).ReflectionName, Is.EqualTo("``"));
		}

		[Test]
		public void ParseInvalidReflectionName4()
		{
			var context = new SimpleTypeResolveContext(compilation.MainModule);
			Assert.That(ReflectionHelper.ParseReflectionName("System.Action`A", context).ReflectionName, Is.EqualTo("System.Action`A"));
		}

		[Test]
		public void ParseInvalidReflectionName5()
		{
			var context = new SimpleTypeResolveContext(compilation.MainModule);
			Assert.Throws<ReflectionNameParseException>(() => ReflectionHelper.ParseReflectionName("System.Environment+", context));
		}

		[Test]
		public void ParseInvalidReflectionName5b()
		{
			var context = new SimpleTypeResolveContext(compilation.MainModule);
			Assert.That(ReflectionHelper.ParseReflectionName("System.Environment+`", context).ReflectionName, Is.EqualTo("System.Environment+`"));
		}

		[Test]
		public void ParseInvalidReflectionName6()
		{
			var context = new SimpleTypeResolveContext(compilation.MainModule);
			Assert.Throws<ReflectionNameParseException>(() => ReflectionHelper.ParseReflectionName("System.Int32[", context));
		}

		[Test]
		public void ParseInvalidReflectionName7()
		{
			var context = new SimpleTypeResolveContext(compilation.MainModule);
			Assert.That(ReflectionHelper.ParseReflectionName("System.Int32[`]", context).ReflectionName, Is.EqualTo("System.Int32"));
		}

		[Test]
		public void ParseInvalidReflectionName8()
		{
			var context = new SimpleTypeResolveContext(compilation.MainModule);
			Assert.Throws<ReflectionNameParseException>(() => ReflectionHelper.ParseReflectionName("System.Int32[,", context));
		}

		[Test]
		public void ParseInvalidReflectionName9()
		{
			var context = new SimpleTypeResolveContext(compilation.MainModule);
			Assert.Throws<ReflectionNameParseException>(() => ReflectionHelper.ParseReflectionName("System.Int32]", context));
		}

		[Test]
		public void ParseInvalidReflectionName10()
		{
			var context = new SimpleTypeResolveContext(compilation.MainModule);
			Assert.Throws<ReflectionNameParseException>(() => ReflectionHelper.ParseReflectionName("System.Int32*a", context));
		}

		[Test]
		public void ParseInvalidReflectionName11()
		{
			var context = new SimpleTypeResolveContext(compilation.MainModule);
			Assert.Throws<ReflectionNameParseException>(() => ReflectionHelper.ParseReflectionName("System.Action`1[[]]", context));
		}

		[Test]
		public void ParseInvalidReflectionName12()
		{
			var context = new SimpleTypeResolveContext(compilation.MainModule);
			Assert.Throws<ReflectionNameParseException>(() => ReflectionHelper.ParseReflectionName("System.Action`1[[System.Int32]a]", context));
		}

		[Test]
		public void ParseInvalidReflectionName13()
		{
			var context = new SimpleTypeResolveContext(compilation.MainModule);
			Assert.Throws<ReflectionNameParseException>(() => ReflectionHelper.ParseReflectionName("System.Action`1[[System.Int32],]", context));
		}

		[Test]
		public void ParseInvalidReflectionName14()
		{
			var context = new SimpleTypeResolveContext(compilation.MainModule);
			Assert.Throws<ReflectionNameParseException>(() => ReflectionHelper.ParseReflectionName("System.Action`1[[System.Int32]", context));
		}

		[Test]
		public void ParseInvalidReflectionName15()
		{
			var context = new SimpleTypeResolveContext(compilation.MainModule);
			Assert.Throws<ReflectionNameParseException>(() => ReflectionHelper.ParseReflectionName("System.Action`1[[System.Int32", context));
		}

		[Test]
		public void ParseInvalidReflectionName16()
		{
			var context = new SimpleTypeResolveContext(compilation.MainModule);
			Assert.Throws<ReflectionNameParseException>(() => ReflectionHelper.ParseReflectionName("System.Action`1[[System.Int32],[System.String", context));
		}
	}
}