// 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
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// DEALINGS IN THE SOFTWARE.

using System;
using System.Linq;
using ICSharpCode.NRefactory.Semantics;
using ICSharpCode.NRefactory.TypeSystem;
using NUnit.Framework;

namespace ICSharpCode.NRefactory.CSharp.Resolver
{
	[TestFixture]
	public class MethodTests : ResolverTestBase
	{
		[Test]
		public void MethodDeclarationWithAttribute()
		{
			string code = @"using System;
class TestClass {
	$[Obsolete(""test"")]
	public void M() {
	}$
}";
			var mrr = Resolve<MemberResolveResult>(code);
			Assert.AreEqual("TestClass.M", mrr.Member.FullName);
		}
		
		[Test]
		public void ParameterIdentityInNormalMethod()
		{
			string code = @"using System;
class TestClass {
	$int F(int i, int j) {
		return i + j;
	}$
}";
			
			var prep = PrepareResolver(code);
			var md = (MethodDeclaration)prep.Item2;

			var resolver = prep.Item1;
			var method = (IMethod)((MemberResolveResult)resolver.Resolve(md)).Member;
			IVariable i1 = method.Parameters.Single(p => p.Name == "i");
			IVariable j1 = method.Parameters.Single(p => p.Name == "j");

			var returnExpr = (BinaryOperatorExpression)md.Body.Children.OfType<ReturnStatement>().Single().Expression;
			var returnRR = (OperatorResolveResult)resolver.Resolve(returnExpr);

			IVariable i2 = ((LocalResolveResult)returnRR.Operands[0]).Variable;
			IVariable j2 = ((LocalResolveResult)returnRR.Operands[1]).Variable;

			Assert.IsTrue(ReferenceEquals(i1, i2));
			Assert.IsTrue(ReferenceEquals(i1, i2));
		}

		[Test]
		public void ParameterIdentityInPropertySetter()
		{
			string code = @"using System;
class TestClass {
	int myField;
	$int Prop {
		get { return myField; }
		set { myField = value; }
	}$
}";
			
			var prep = PrepareResolver(code);
			var pd = (PropertyDeclaration)prep.Item2;

			var resolver = prep.Item1;
			var property = (IProperty)((MemberResolveResult)resolver.Resolve(pd)).Member;
			IVariable value1 = property.Setter.Parameters.Single(p => p.Name == "value");

			var assignExpr = (AssignmentExpression)pd.Setter.Body.Children.OfType<ExpressionStatement>().Single().Expression;
			var assignRR = (OperatorResolveResult)resolver.Resolve(assignExpr);

			IVariable value2 = ((LocalResolveResult)assignRR.Operands[1]).Variable;

			Assert.IsTrue(ReferenceEquals(value1, value2));
		}

		[Test]
		public void ParameterIdentityInIndexerGetter()
		{
			string code = @"using System;
class TestClass {
	int[,] myField;
	$int this[int i, int j] {
		get { return myField[i, j]; }
		set { myField[i, j] = value; }
	}$
}";
			
			var prep = PrepareResolver(code);
			var id = (IndexerDeclaration)prep.Item2;

			var resolver = prep.Item1;
			var property = (IProperty)((MemberResolveResult)resolver.Resolve(id)).Member;
			IVariable i1 = property.Getter.Parameters.Single(p => p.Name == "i");
			IVariable j1 = property.Getter.Parameters.Single(p => p.Name == "j");

			var accessExpr = (IndexerExpression)id.Getter.Body.Children.OfType<ReturnStatement>().Single().Expression;
			var accessRR = (ArrayAccessResolveResult)resolver.Resolve(accessExpr);
			IVariable i2 = ((LocalResolveResult)accessRR.Indexes[0]).Variable;
			IVariable j2 = ((LocalResolveResult)accessRR.Indexes[1]).Variable;

			Assert.IsTrue(ReferenceEquals(i1, i2));
			Assert.IsTrue(ReferenceEquals(j1, j2));
		}

		[Test]
		public void ParameterIdentityInIndexerSetter()
		{
			string code = @"using System;
class TestClass {
	int[,] myField;
	$int this[int i, int j] {
		get { return myField[i, j]; }
		set { myField[i, j] = value; }
	}$
}";
			
			var prep = PrepareResolver(code);
			var id = (IndexerDeclaration)prep.Item2;

			var resolver = prep.Item1;
			var property = (IProperty)((MemberResolveResult)resolver.Resolve(id)).Member;
			IVariable i1 = property.Setter.Parameters.Single(p => p.Name == "i");
			IVariable j1 = property.Setter.Parameters.Single(p => p.Name == "j");
			IVariable value1 = property.Setter.Parameters.Single(p => p.Name == "value");

			var assignExpr = (AssignmentExpression)id.Setter.Body.Children.OfType<ExpressionStatement>().Single().Expression;
			var assignRR = (OperatorResolveResult)resolver.Resolve(assignExpr);
			var accessRR = (ArrayAccessResolveResult)assignRR.Operands[0];
			IVariable i2 = ((LocalResolveResult)accessRR.Indexes[0]).Variable;
			IVariable j2 = ((LocalResolveResult)accessRR.Indexes[1]).Variable;
			IVariable value2 = ((LocalResolveResult)assignRR.Operands[1]).Variable;

			Assert.IsTrue(ReferenceEquals(i1, i2));
			Assert.IsTrue(ReferenceEquals(j1, j2));
			Assert.IsTrue(ReferenceEquals(value1, value2));
		}
		
		[Test]
		public void ResolveParameterDeclarationInIndexer()
		{
			string code = @"using System;
class TestClass {
	int[,] myField;
	int this[$int i$, int j] {
		get { return myField[i, j]; }
		set { myField[i, j] = value; }
	}
}";
			var rr = Resolve<LocalResolveResult>(code);
			Assert.IsTrue(rr.IsParameter);
		}

		[Test]
		public void ParameterIdentityInEventAdder()
		{
			string code = @"using System;
class TestClass {
	EventHandler myField;
	$event EventHandler Evt {
		add { myField += value; }
		remove { myField -= value; }
	}$
}";
			
			var prep = PrepareResolver(code);
			var ed = (CustomEventDeclaration)prep.Item2;

			var resolver = prep.Item1;
			var evt = (IEvent)((MemberResolveResult)resolver.Resolve(ed)).Member;
			IVariable value1 = evt.AddAccessor.Parameters.Single(p => p.Name == "value");

			var assignExpr = (AssignmentExpression)ed.AddAccessor.Body.Children.OfType<ExpressionStatement>().Single().Expression;
			var assignRR = (OperatorResolveResult)resolver.Resolve(assignExpr);

			IVariable value2 = ((LocalResolveResult)assignRR.Operands[1]).Variable;

			Assert.IsTrue(ReferenceEquals(value1, value2));
		}

		[Test]
		public void ParameterIdentityInEventRemover()
		{
			string code = @"using System;
class TestClass {
	EventHandler myField;
	$event EventHandler Evt {
		add { myField += value; }
		remove { myField -= value; }
	}$
}";
			
			var prep = PrepareResolver(code);
			var ed = (CustomEventDeclaration)prep.Item2;

			var resolver = prep.Item1;
			var evt = (IEvent)((MemberResolveResult)resolver.Resolve(ed)).Member;
			IVariable value1 = evt.RemoveAccessor.Parameters.Single(p => p.Name == "value");

			var assignExpr = (AssignmentExpression)ed.RemoveAccessor.Body.Children.OfType<ExpressionStatement>().Single().Expression;
			var assignRR = (OperatorResolveResult)resolver.Resolve(assignExpr);

			IVariable value2 = ((LocalResolveResult)assignRR.Operands[1]).Variable;

			Assert.IsTrue(ReferenceEquals(value1, value2));
		}
		
		[Test]
		public void MethodWithInvalidCastInDefaultValue()
		{
			var input = @"
class TestClass
{
	void TestMethod ($int x = true$)
	{
	}
}";
			var rr = Resolve<LocalResolveResult>(input);
			IParameter p = (IParameter)rr.Variable;
			Assert.IsTrue(p.IsOptional);
			Assert.IsNull(p.ConstantValue);
		}
	}
}