using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Linq;

#if __UNIFIED__
using Foundation;
using ObjCRuntime;
#else
using MonoTouch.Foundation;
using MonoTouch.ObjCRuntime;
#endif

using NUnit.Framework;

namespace Xamarin.BindingTests
{
	[TestFixture]
	[Preserve (AllMembers = true)]
	public class ProtocolTest
	{
		[Test]
		public void OnlyProtocol ()
		{
			if ((XamarinTests.ObjCRuntime.Registrar.CurrentRegistrar & XamarinTests.ObjCRuntime.Registrars.AllNew) == 0)
				Assert.Ignore ("This test requires the new registrars.");
			
			// a binding with only [Protocol]
			var bindingAssembly = GetType ().Assembly;

			// the interface must be created
			var IP1 = bindingAssembly.GetType ("Bindings.Test.Protocol.IP1");
			Assert.IsNotNull (IP1, "IP1");
			// with a [Protocol] attribute
			var IP1Attributes = IP1.GetCustomAttributes (typeof (ProtocolAttribute), false);
			Assert.AreEqual (1, IP1Attributes.Length, "[Protocol] IP1");
			var IP1Protocol = (ProtocolAttribute)IP1Attributes [0];
			Assert.AreEqual ("P1", IP1Protocol.Name, "Name");
			// and a wrapper type
			var wrapperType = bindingAssembly.GetType ("Bindings.Test.Protocol.P1Wrapper");
			Assert.IsNotNull (wrapperType, "P1_Wrapper");
			Assert.AreEqual (wrapperType, IP1Protocol.WrapperType, "WrapperType");
			// but not the model
			Assert.IsNull (bindingAssembly.GetType ("Bindings.Test.Protocol.P1"), "P1");
		}

		[Test]
		public void ProtocolWithBaseType ()
		{
			if ((XamarinTests.ObjCRuntime.Registrar.CurrentRegistrar & XamarinTests.ObjCRuntime.Registrars.AllNew) == 0)
				Assert.Ignore ("This test requires the new registrars.");
			
			// a binding with [Protocol] and [BaseType]
			var bindingAssembly = GetType ().Assembly;

			// the interface must be created
			var IP2 = bindingAssembly.GetType ("Bindings.Test.Protocol.IP2");
			Assert.IsNotNull (IP2, "IP2");

			// with a [Protocol] attribute
			var IP2Attributes = IP2.GetCustomAttributes (typeof (ProtocolAttribute), false);
			Assert.AreEqual (1, IP2Attributes.Length, "[Protocol] IP2");
			var IP2Protocol = (ProtocolAttribute)IP2Attributes [0];
			Assert.AreEqual ("P2", IP2Protocol.Name, "Name");

			// and a wrapper type
			var wrapperType = bindingAssembly.GetType ("Bindings.Test.Protocol.P2Wrapper");
			Assert.IsNotNull (wrapperType, "P2_Wrapper");
			Assert.AreEqual (wrapperType, IP2Protocol.WrapperType, "WrapperType");

			// and a model-like class
			var model = bindingAssembly.GetType ("Bindings.Test.Protocol.P2");
			Assert.IsNotNull (model, "P2");
			// but without the [Model] attribute
			Assert.False (model.IsDefined (typeof(ModelAttribute), false), "model");
		}

		[Test]
		public void ProtocolWithBaseTypeAndModel ()
		{
			if ((XamarinTests.ObjCRuntime.Registrar.CurrentRegistrar & XamarinTests.ObjCRuntime.Registrars.AllNew) == 0)
				Assert.Ignore ("This test requires the new registrars.");
			
			// a binding with [Protocol] and [BaseType]
			var bindingAssembly = GetType ().Assembly;

			// the interface must be created
			var IP3 = bindingAssembly.GetType ("Bindings.Test.Protocol.IP3");
			Assert.IsNotNull (IP3, "IP3");

			// with a [Protocol] attribute
			var IP3Attributes = IP3.GetCustomAttributes (typeof (ProtocolAttribute), false);
			Assert.AreEqual (1, IP3Attributes.Length, "[Protocol] IP3");
			var IP3Protocol = (ProtocolAttribute)IP3Attributes [0];
			Assert.AreEqual ("P3", IP3Protocol.Name, "Name");

			// and a wrapper type
			var wrapperType = bindingAssembly.GetType ("Bindings.Test.Protocol.P3Wrapper");
			Assert.IsNotNull (wrapperType, "P3_Wrapper");
			Assert.AreEqual (wrapperType, IP3Protocol.WrapperType, "WrapperType");

			// and a model class
			var model = bindingAssembly.GetType ("Bindings.Test.Protocol.P3");
			Assert.IsNotNull (model, "P3");
			// with a [Model] attribute
			Assert.True (model.IsDefined (typeof(ModelAttribute), false), "model");
		}

		class MembersImplementation : NSObject, Bindings.Test.Protocol.IMemberAttributes
		{
			public void RequiredInstanceMethod ()
			{
			}

			public string RequiredInstanceProperty {
				get { return null; }
				set { }
			}

			public NSString RequiredReadonlyProperty {
				get { return null; }
			}
		}

		void CleanupSignatures (objc_method_description [] methods)
		{
			for (int i = 0; i < methods.Length; i++) {
				methods [i].Types = methods [i].Types.Replace ("0", "").Replace ("1", "").Replace ("2", "").Replace ("3", "").Replace ("4", "").Replace ("5", "").Replace ("6", "").Replace ("7", "").Replace ("8", "").Replace ("9", "");
			}
		}

		[Test]
		public void ProtocolMembers ()
		{
			if ((XamarinTests.ObjCRuntime.Registrar.CurrentRegistrar & XamarinTests.ObjCRuntime.Registrars.AllNew) == 0)
				Assert.Ignore ("This test requires the new registrars.");
			
			IntPtr protocol = objc_getProtocol ("MemberAttributes");
			Assert.AreNotEqual (IntPtr.Zero, protocol, "a");

			objc_method_description[] methods;

			// Required instance methods
			methods = protocol_copyMethodDescriptionList (protocol, true, true);
			CleanupSignatures (methods);
			Assert.AreEqual (4, methods.Length, "Required Instance Methods: Count");
			Assert.That (methods, Contains.Item (new objc_method_description ("requiredInstanceMethod", "v@:")), "Required Instance Methods: requiredInstanceMethod");
			Assert.That (methods, Contains.Item (new objc_method_description ("requiredInstanceProperty", "@@:")), "Required Instance Methods: requiredInstanceProperty");
			Assert.That (methods, Contains.Item (new objc_method_description ("setRequiredInstanceProperty:", "v@:@")), "Required Instance Methods: setRequiredInstanceProperty");
			Assert.That (methods, Contains.Item (new objc_method_description ("requiredReadonlyProperty", "@@:")), "Required Instance Methods: requiredReadonlyProperty:");
			
			// Required static methods
			methods = protocol_copyMethodDescriptionList (protocol, true, false);
			CleanupSignatures (methods);
			Assert.AreEqual (3, methods.Length, "Required Static Methods: Count");
			Assert.That (methods, Contains.Item (new objc_method_description ("requiredStaticMethod", "v@:")), "Required Static Methods: requiredStaticMethod");
			Assert.That (methods, Contains.Item (new objc_method_description ("setRequiredStaticProperty:", "v@:@")), "Required Static Methods: setRequiredStaticProperty:");
			Assert.That (methods, Contains.Item (new objc_method_description ("requiredStaticProperty", "@@:")), "Required Static Methods: requiredStaticProperty");
			
			// Optional instance methods
			methods = protocol_copyMethodDescriptionList (protocol, false, true);
			CleanupSignatures (methods);
			Assert.AreEqual (19, methods.Length, "Optional Instance Methods: Count");
			Assert.That (methods, Contains.Item (new objc_method_description ("variadicMethod:", "v@:^v")), "Optional Instance Methods: variadicMethod:");
			Assert.That (methods, Contains.Item (new objc_method_description ("methodWithReturnType", "@@:")), "Optional Instance Methods: methodWithReturnType");
			Assert.That (methods, Contains.Item (new objc_method_description ("methodWithParameter:", "v@:i")), "Optional Instance Methods: methodWithParameter:");
			Assert.That (methods, Contains.Item (new objc_method_description ("methodWithParameters:second:third:fourth:", "v@:iiii")), "Optional Instance Methods: methodWithParameters:second:third:fourth:");
			Assert.That (methods, Contains.Item (new objc_method_description ("optionalInstanceMethod", "v@:")), "Optional Instance Methods: optionalInstanceMethod");
			Assert.That (methods, Contains.Item (new objc_method_description ("methodWithRefParameters:second:third:fourth:", "v@:i^i^ii")), "Optional Instance Methods: methodWithRefParameters:second:third:fourth:");
			Assert.That (methods, Contains.Item (new objc_method_description ("optionalInstanceProperty", "@@:")), "Optional Instance Methods: optionalInstanceProperty");
			Assert.That (methods, Contains.Item (new objc_method_description ("setOptionalInstanceProperty:", "v@:@")), "Optional Instance Methods: setOptionalInstanceProperty:");
			Assert.That (methods, Contains.Item (new objc_method_description ("get_propertyWithCustomAccessors", "@@:")), "Optional Instance Methods: get_propertyWithCustomAccessors");
			Assert.That (methods, Contains.Item (new objc_method_description ("set_propertyWithCustomAccessors:", "v@:@")), "Optional Instance Methods: set_propertyWithCustomAccessors:");
			Assert.That (methods, Contains.Item (new objc_method_description ("propertyWithArgumentSemanticNone", "@@:")), "Optional Instance Methods: propertyWithArgumentSemanticNone");
			Assert.That (methods, Contains.Item (new objc_method_description ("setPropertyWithArgumentSemanticNone:", "v@:@")), "Optional Instance Methods: setPropertyWithArgumentSemanticNone:");
			Assert.That (methods, Contains.Item (new objc_method_description ("propertyWithArgumentSemanticCopy", "@@:")), "Optional Instance Methods: propertyWithArgumentSemanticCopy");
			Assert.That (methods, Contains.Item (new objc_method_description ("setPropertyWithArgumentSemanticCopy:", "v@:@")), "Optional Instance Methods: setPropertyWithArgumentSemanticCopy:");
			Assert.That (methods, Contains.Item (new objc_method_description ("propertyWithArgumentSemanticAssign", "@@:")), "Optional Instance Methods: propertyWithArgumentSemanticAssign");
			Assert.That (methods, Contains.Item (new objc_method_description ("setPropertyWithArgumentSemanticAssign:", "v@:@")), "Optional Instance Methods: setPropertyWithArgumentSemanticAssign:");
			Assert.That (methods, Contains.Item (new objc_method_description ("readonlyProperty", "@@:")), "Optional Instance Methods: readonlyProperty:");
			Assert.That (methods, Contains.Item (new objc_method_description ("propertyWithArgumentSemanticRetain", "@@:")), "Optional Instance Methods: propertyWithArgumentSemanticRetain");
			Assert.That (methods, Contains.Item (new objc_method_description ("setPropertyWithArgumentSemanticRetain:", "v@:@")), "Optional Instance Methods: setPropertyWithArgumentSemanticRetain:");

			// Optional static methods
			methods = protocol_copyMethodDescriptionList (protocol, false, false);
			CleanupSignatures (methods);
			Assert.AreEqual (3, methods.Length, "Optional Static Methods: Count");
			Assert.That (methods, Contains.Item (new objc_method_description ("optionalStaticMethod", "v@:")), "Optional Static Methods: optionalStaticMethod");
			Assert.That (methods, Contains.Item (new objc_method_description ("optionalStaticProperty", "@@:")), "Optional Static Methods: optionalStaticProperty");
			Assert.That (methods, Contains.Item (new objc_method_description ("setOptionalStaticProperty:", "v@:@")), "Optional Static Methods: setOptionalStaticProperty:");

			objc_property[] properties;
			properties = protocol_copyPropertyList (protocol);

			// The ObjC runtime won't add optional properties dynamically (the code is commented out,
			// see file objc4-647/runtime/objc-runtime-old.mm in Apple's open source code),
			// so we need to verify differently for the dynamic registrar.
			if (XamarinTests.ObjCRuntime.Registrar.CurrentRegistrar == XamarinTests.ObjCRuntime.Registrars.Static) {
				Assert.AreEqual (9, properties.Length, "Properties: Count");
			} else {
				Assert.AreEqual (2, properties.Length, "Properties: Count");
			}

			Assert.That (properties, Contains.Item (new objc_property ("requiredInstanceProperty", "T@\"NSString\",N", new objc_property_attribute [] {
				new objc_property_attribute ("T", "@\"NSString\""),
				new objc_property_attribute ("N", "")
			})), "Properties: requiredInstanceProperty");

			Assert.That (properties, Contains.Item (new objc_property ("requiredReadonlyProperty", "T@\"NSString\",R,N", new objc_property_attribute [] {
				new objc_property_attribute ("T", "@\"NSString\""),
				new objc_property_attribute ("R", ""),
				new objc_property_attribute ("N", "")
			})), "Properties: requiredReadonlyProperty");

			if (XamarinTests.ObjCRuntime.Registrar.CurrentRegistrar == XamarinTests.ObjCRuntime.Registrars.Static) {
				Assert.That (properties, Contains.Item (new objc_property ("optionalInstanceProperty", "T@\"NSString\",N", new objc_property_attribute [] {
					new objc_property_attribute ("T", "@\"NSString\""),
					new objc_property_attribute ("N", "")
				})), "Properties: optionalInstanceProperty");

				Assert.That (properties, Contains.Item (new objc_property ("propertyWithCustomAccessors", "T@\"NSString\",N,Gget_propertyWithCustomAccessors,Sset_propertyWithCustomAccessors:", new objc_property_attribute [] {
					new objc_property_attribute ("T", "@\"NSString\""),
					new objc_property_attribute ("N", ""),
					new objc_property_attribute ("G", "get_propertyWithCustomAccessors"),
					new objc_property_attribute ("S", "set_propertyWithCustomAccessors:")
				})), "Properties: propertyWithCustomAccessors");

				Assert.That (properties, Contains.Item (new objc_property ("propertyWithArgumentSemanticNone", "T@\"NSString\",N", new objc_property_attribute [] {
					new objc_property_attribute ("T", "@\"NSString\""),
					new objc_property_attribute ("N", "")
				})), "Properties: propertyWithArgumentSemanticNone");

				Assert.That (properties, Contains.Item (new objc_property ("propertyWithArgumentSemanticCopy", "T@\"NSString\",C,N", new objc_property_attribute [] {
					new objc_property_attribute ("T", "@\"NSString\""),
					new objc_property_attribute ("N", ""),
					new objc_property_attribute ("C", "")
				})), "Properties: propertyWithArgumentSemanticCopy");

				Assert.That (properties, Contains.Item (new objc_property ("propertyWithArgumentSemanticAssign", "T@\"NSString\",N", new objc_property_attribute [] {
					new objc_property_attribute ("T", "@\"NSString\""),
					new objc_property_attribute ("N", "")
				})), "Properties: propertyWithArgumentSemanticAssign");

				Assert.That (properties, Contains.Item (new objc_property ("propertyWithArgumentSemanticRetain", "T@\"NSString\",&,N", new objc_property_attribute [] {
					new objc_property_attribute ("T", "@\"NSString\""),
					new objc_property_attribute ("&", ""),
					new objc_property_attribute ("N", "")
				})), "Properties: propertyWithArgumentSemanticRetain");

				Assert.That (properties, Contains.Item (new objc_property ("readonlyProperty", "T@\"NSString\",R,N", new objc_property_attribute [] {
					new objc_property_attribute ("T", "@\"NSString\""),
					new objc_property_attribute ("R", ""),
					new objc_property_attribute ("N", "")
				})), "Properties: readonlyProperty");
			}
		}

		[DllImport ("/usr/lib/libobjc.dylib")]
		internal extern static IntPtr objc_getProtocol (string name);

		[DllImport ("/usr/lib/libobjc.dylib")]
		internal extern static IntPtr protocol_getName (IntPtr protocol);

		[DllImport ("/usr/lib/libobjc.dylib", EntryPoint = "protocol_copyMethodDescriptionList")]
		extern static IntPtr _protocol_copyMethodDescriptionList (IntPtr protocol, bool isRequiredMethod, bool isInstanceMethod, out int count);

		static objc_method_description[] protocol_copyMethodDescriptionList (IntPtr protocol, bool isRequiredMethod, bool isInstanceMethod)
		{
			int count;
			IntPtr methods = _protocol_copyMethodDescriptionList (protocol, isRequiredMethod, isInstanceMethod, out count);
			try {
				var rv = new objc_method_description [count];
				for (int i = 0; i < count; i++) {
					var sel = new Selector (Marshal.ReadIntPtr (methods + (IntPtr.Size * 2) * i)).Name;
					var types = Marshal.PtrToStringAuto (Marshal.ReadIntPtr (methods + (IntPtr.Size * 2) * i + IntPtr.Size));
					rv [i] = new objc_method_description (sel, types);
				}
				return rv;
			} finally {
				free (methods);
			}
		}

		[DllImport ("/usr/lib/libobjc.dylib", EntryPoint = "protocol_copyPropertyList")]
		internal extern static IntPtr _protocol_copyPropertyList (IntPtr protocol, out int count);

		static objc_property[] protocol_copyPropertyList (IntPtr protocol)
		{
			int count;
			IntPtr list = _protocol_copyPropertyList (protocol, out count);
			var rv = new objc_property[count];
			try {
				for (int i = 0; i < count; i++) {
					var prop = new objc_property ();
					IntPtr p = Marshal.ReadIntPtr (list, IntPtr.Size * i);
					rv [i] = prop;
					prop.Name = property_getName (p);
					prop.Attributes = property_getAttributes (p);
					prop.AttributeList = property_copyAttributeList (p);
				}
				return rv;
			} finally {
				free (list);
			}
		}

		[DllImport ("/usr/lib/libobjc.dylib")]
		internal extern static IntPtr protocol_copyProtocolList (IntPtr protocol, out int count);


		[DllImport ("/usr/lib/libobjc.dylib", EntryPoint = "property_getName")]
		extern static IntPtr _property_getName (IntPtr property);

		static string property_getName (IntPtr property)
		{
			return Marshal.PtrToStringAuto (_property_getName (property));
		}

		[DllImport ("/usr/lib/libobjc.dylib", EntryPoint = "property_getAttributes")]
		extern static IntPtr _property_getAttributes (IntPtr property);

		static string property_getAttributes (IntPtr property)
		{
			return Marshal.PtrToStringAuto (_property_getAttributes (property));
		}

		[DllImport ("/usr/lib/libobjc.dylib", EntryPoint = "property_copyAttributeList")]
		extern static IntPtr _property_copyAttributeList (IntPtr property, out int outCount);

		static objc_property_attribute[] property_copyAttributeList (IntPtr property)
		{
			int count;
			IntPtr list = _property_copyAttributeList (property, out count);
			var rv = new objc_property_attribute [count];
			try {
				for (int i = 0; i < count; i++) {
					var attrib = new objc_property_attribute ();
					rv [i] = attrib;
					IntPtr n = Marshal.ReadIntPtr (list, (IntPtr.Size * 2) * i);
					IntPtr v = Marshal.ReadIntPtr (list, (IntPtr.Size * 2) * i + IntPtr.Size);
					attrib.Name = Marshal.PtrToStringAuto (n);
					attrib.Value = Marshal.PtrToStringAuto (v);
				}
				return rv;
			} finally {
				free (list);
			}
		}

		[DllImport ("/usr/lib/libc.dylib")]
		internal extern static void free (IntPtr ptr);

		class objc_property_attribute : IEquatable<objc_property_attribute> {
			public string Name;
			public string Value;

			public objc_property_attribute ()
			{
			}

			public objc_property_attribute (string name, string value)
			{
				this.Name = name;
				this.Value = value;
			}

			bool IEquatable<objc_property_attribute>.Equals (objc_property_attribute other)
			{
				return Name == other.Name && Value == other.Value;
			}

			public override bool Equals (object obj)
			{
				var other = (objc_property_attribute)obj;
				if (other == null)
					return false;
				return Name == other.Name && Value == other.Value;
			}

			public override int GetHashCode ()
			{
				return Name.GetHashCode () ^ Value.GetHashCode ();
			}

			public override string ToString ()
			{
				return string.Format ("{0} = {1}", Name, Value);
			}
		}
			
		class objc_property : IEquatable<objc_property> {
			public string Name;
			public string Attributes;
			public objc_property_attribute[] AttributeList;

			public objc_property ()
			{
			}

			public objc_property (string name, string attributes, objc_property_attribute [] list)
			{
				this.Name = name;
				this.Attributes = attributes;
				this.AttributeList = list;
			}

			public override string ToString ()
			{
				return string.Format ("[{0}; {1}; {2}]", Name, Attributes, string.Join (", ", new List<objc_property_attribute> (AttributeList).Select ((v) => string.Format ("{0} = {1}", v.Name, v.Value))));
			}

			bool IEquatable<objc_property>.Equals (objc_property other)
			{
				if (other.Name != Name)
					return false;
				if (other.Attributes != Attributes)
					return false;
				if (other.AttributeList.Length != AttributeList.Length)
					return false;
				foreach (var entry in AttributeList)
					if (!other.AttributeList.Contains (entry))
						return false;
				return true;
			}
		}

		class objc_method_description : IEquatable<objc_method_description> {
			public string Name;
			public string Types;

			public objc_method_description (string name, string types)
			{
				this.Name = name;
				this.Types = types;
			}

			public override string ToString ()
			{
				return string.Format ("[{0}; {1}]", Name, Types);
			}

			bool IEquatable<objc_method_description>.Equals (objc_method_description other)
			{
				return other.Name == Name && other.Types == Types;
			}
		}
	}
}