/*
  Copyright (C) 2009 Jeroen Frijters

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.

  Jeroen Frijters
  jeroen@frijters.net
  
*/
using System;
using System.Collections.Generic;
using System.Text;
using IKVM.Reflection.Metadata;

namespace IKVM.Reflection.Reader
{
	sealed class PropertyInfoImpl : PropertyInfo
	{
		private readonly ModuleReader module;
		private readonly Type declaringType;
		private readonly int index;
		private PropertySignature sig;
		private bool isPublic;
		private bool isStatic;
		private bool flagsCached;

		internal PropertyInfoImpl(ModuleReader module, Type declaringType, int index)
		{
			this.module = module;
			this.declaringType = declaringType;
			this.index = index;
		}

		public override bool Equals(object obj)
		{
			PropertyInfoImpl other = obj as PropertyInfoImpl;
			return other != null && other.DeclaringType == declaringType && other.index == index;
		}

		public override int GetHashCode()
		{
			return declaringType.GetHashCode() * 77 + index;
		}

		internal override PropertySignature PropertySignature
		{
			get
			{
				if (sig == null)
				{
					sig = PropertySignature.ReadSig(module, module.GetBlob(module.Property.records[index].Type), declaringType);
				}
				return sig;
			}
		}

		public override PropertyAttributes Attributes
		{
			get { return (PropertyAttributes)module.Property.records[index].Flags; }
		}

		public override object GetRawConstantValue()
		{
			return module.Constant.GetRawConstantValue(module, this.MetadataToken);
		}

		public override bool CanRead
		{
			get { return GetGetMethod(true) != null; }
		}

		public override bool CanWrite
		{
			get { return GetSetMethod(true) != null; }
		}

		public override MethodInfo GetGetMethod(bool nonPublic)
		{
			return module.MethodSemantics.GetMethod(module, this.MetadataToken, nonPublic, MethodSemanticsTable.Getter);
		}

		public override MethodInfo GetSetMethod(bool nonPublic)
		{
			return module.MethodSemantics.GetMethod(module, this.MetadataToken, nonPublic, MethodSemanticsTable.Setter);
		}

		public override MethodInfo[] GetAccessors(bool nonPublic)
		{
			return module.MethodSemantics.GetMethods(module, this.MetadataToken, nonPublic, MethodSemanticsTable.Getter | MethodSemanticsTable.Setter | MethodSemanticsTable.Other);
		}

		public override Type DeclaringType
		{
			get { return declaringType; }
		}

		public override Module Module
		{
			get { return module; }
		}

		public override int MetadataToken
		{
			get { return (PropertyTable.Index << 24) + index + 1; }
		}

		public override string Name
		{
			get { return module.GetString(module.Property.records[index].Name); }
		}

		internal override bool IsPublic
		{
			get
			{
				if (!flagsCached)
				{
					ComputeFlags();
				}
				return isPublic;
			}
		}

		internal override bool IsStatic
		{
			get
			{
				if (!flagsCached)
				{
					ComputeFlags();
				}
				return isStatic;
			}
		}

		private void ComputeFlags()
		{
			module.MethodSemantics.ComputeFlags(module, this.MetadataToken, out isPublic, out isStatic);
			flagsCached = true;
		}
	}
}