using System;
using System.Linq;
using Indy.IL2CPU.Assembler.X86;
using Indy.IL2CPU.Plugs;
using Assembler = Indy.IL2CPU.Assembler.Assembler;
using CPUx86 = Indy.IL2CPU.Assembler.X86;

namespace Indy.IL2CPU.IL.X86.CustomImplementations.System.Assemblers {
	public class Array_InternalCopy: AssemblerMethod {

		/* void Copy(Array sourceArray,			ebp + 0x1C
		 *			 int sourceIndex,			ebp + 0x18
		 *			 Array destinationArray,	ebp + 0x14
		 *			 int destinationIndex,		ebp + 0x10
		 *			 int length,				ebp + 0xC
		 *			 bool reliable);			ebp + 0x8
		 */
		public override void Assemble(Indy.IL2CPU.Assembler.Assembler aAssembler) {
            new CPUx86.Push { DestinationReg = Registers.EBP, DestinationIsIndirect = true, DestinationDisplacement = 0x1C };
            new CPUx86.Add { DestinationReg = Registers.ESP, DestinationIsIndirect = true, SourceValue = 12, Size = 32 }; // pointer is at the element size
            new CPUx86.Pop { DestinationReg = Registers.EAX };
            new CPUx86.Move { DestinationReg = CPUx86.Registers.EAX, SourceReg = CPUx86.Registers.EAX, SourceIsIndirect = true }; // element size
            new CPUx86.Move { DestinationReg = CPUx86.Registers.EBX, SourceReg = CPUx86.Registers.EBP, SourceIsIndirect = true, SourceDisplacement = 0x18 };
            new CPUx86.Multiply { DestinationReg = Registers.EBX };
            new CPUx86.Add { DestinationReg = Registers.EAX, SourceValue = 16 };
            new CPUx86.Move { DestinationReg = CPUx86.Registers.ESI, SourceReg = CPUx86.Registers.EBP, SourceIsIndirect = true, SourceDisplacement = 0x1C };
            new CPUx86.Add { DestinationReg = Registers.ESI, SourceReg = Registers.EAX }; // source ptr
            new CPUx86.Push { DestinationReg = Registers.EBP, DestinationIsIndirect = true, DestinationDisplacement = 0x14 };
			new CPUx86.Add { DestinationReg = Registers.ESP, DestinationIsIndirect = true, SourceValue = 12, Size = 32 }; // pointer is at element size
            new CPUx86.Pop { DestinationReg = Registers.EAX };
            new CPUx86.Move { DestinationReg = CPUx86.Registers.EAX, SourceReg = CPUx86.Registers.EAX, SourceIsIndirect = true }; 
            new CPUx86.Move { DestinationReg = CPUx86.Registers.ECX, SourceReg = CPUx86.Registers.EBP, SourceIsIndirect = true, SourceDisplacement = 0x10 };
            new CPUx86.Multiply { DestinationReg = Registers.ECX };
			new CPUx86.Add{DestinationReg = Registers.EAX, SourceValue=16};
            new CPUx86.Move { DestinationReg = CPUx86.Registers.EDI, SourceReg = CPUx86.Registers.EBP, SourceIsIndirect = true, SourceDisplacement = 0x14 };
            new CPUx86.Add{DestinationReg = Registers.EDI, SourceReg=Registers.EAX};

			// calculate byte count to copy
            new CPUx86.Move { DestinationReg = CPUx86.Registers.EAX, SourceReg = CPUx86.Registers.EBP, SourceIsIndirect = true, SourceDisplacement = 0x14 };
            new CPUx86.Add { DestinationReg = Registers.EAX, SourceValue = 12 };
            new CPUx86.Move { DestinationReg = CPUx86.Registers.EAX, SourceReg = CPUx86.Registers.EAX, SourceIsIndirect = true};
            new CPUx86.Move { DestinationReg = CPUx86.Registers.EDX, SourceReg = CPUx86.Registers.EBP, SourceIsIndirect = true, SourceDisplacement = 0xC };
            new CPUx86.Multiply { DestinationReg = Registers.EDX };
            new CPUx86.Move { DestinationReg = CPUx86.Registers.ECX, SourceReg = CPUx86.Registers.EAX, };
            new RepeatMovs{Size=8};
		}
	}
}