//
// Author:
//   Jb Evain (jbevain@gmail.com)
//
// Copyright (c) 2008 - 2015 Jb Evain
// Copyright (c) 2008 - 2011 Novell, Inc.
//
// Licensed under the MIT/X11 license.
//

using System;

using Mono.Collections.Generic;

namespace Mono.Cecil.Cil {

	public sealed class ILProcessor {

		readonly MethodBody body;
		readonly Collection<Instruction> instructions;

		public MethodBody Body {
			get { return body; }
		}

		internal ILProcessor (MethodBody body)
		{
			this.body = body;
			this.instructions = body.Instructions;
		}

		public Instruction Create (OpCode opcode)
		{
			return Instruction.Create (opcode);
		}

		public Instruction Create (OpCode opcode, TypeReference type)
		{
			return Instruction.Create (opcode, type);
		}

		public Instruction Create (OpCode opcode, CallSite site)
		{
			return Instruction.Create (opcode, site);
		}

		public Instruction Create (OpCode opcode, MethodReference method)
		{
			return Instruction.Create (opcode, method);
		}

		public Instruction Create (OpCode opcode, FieldReference field)
		{
			return Instruction.Create (opcode, field);
		}

		public Instruction Create (OpCode opcode, string value)
		{
			return Instruction.Create (opcode, value);
		}

		public Instruction Create (OpCode opcode, sbyte value)
		{
			return Instruction.Create (opcode, value);
		}

		public Instruction Create (OpCode opcode, byte value)
		{
			if (opcode.OperandType == OperandType.ShortInlineVar)
				return Instruction.Create (opcode, body.Variables [value]);

			if (opcode.OperandType == OperandType.ShortInlineArg)
				return Instruction.Create (opcode, body.GetParameter (value));

			return Instruction.Create (opcode, value);
		}

		public Instruction Create (OpCode opcode, int value)
		{
			if (opcode.OperandType == OperandType.InlineVar)
				return Instruction.Create (opcode, body.Variables [value]);

			if (opcode.OperandType == OperandType.InlineArg)
				return Instruction.Create (opcode, body.GetParameter (value));

			return Instruction.Create (opcode, value);
		}

		public Instruction Create (OpCode opcode, long value)
		{
			return Instruction.Create (opcode, value);
		}

		public Instruction Create (OpCode opcode, float value)
		{
			return Instruction.Create (opcode, value);
		}

		public Instruction Create (OpCode opcode, double value)
		{
			return Instruction.Create (opcode, value);
		}

		public Instruction Create (OpCode opcode, Instruction target)
		{
			return Instruction.Create (opcode, target);
		}

		public Instruction Create (OpCode opcode, Instruction [] targets)
		{
			return Instruction.Create (opcode, targets);
		}

		public Instruction Create (OpCode opcode, VariableDefinition variable)
		{
			return Instruction.Create (opcode, variable);
		}

		public Instruction Create (OpCode opcode, ParameterDefinition parameter)
		{
			return Instruction.Create (opcode, parameter);
		}

		public void Emit (OpCode opcode)
		{
			Append (Create (opcode));
		}

		public void Emit (OpCode opcode, TypeReference type)
		{
			Append (Create (opcode, type));
		}

		public void Emit (OpCode opcode, MethodReference method)
		{
			Append (Create (opcode, method));
		}

		public void Emit (OpCode opcode, CallSite site)
		{
			Append (Create (opcode, site));
		}

		public void Emit (OpCode opcode, FieldReference field)
		{
			Append (Create (opcode, field));
		}

		public void Emit (OpCode opcode, string value)
		{
			Append (Create (opcode, value));
		}

		public void Emit (OpCode opcode, byte value)
		{
			Append (Create (opcode, value));
		}

		public void Emit (OpCode opcode, sbyte value)
		{
			Append (Create (opcode, value));
		}

		public void Emit (OpCode opcode, int value)
		{
			Append (Create (opcode, value));
		}

		public void Emit (OpCode opcode, long value)
		{
			Append (Create (opcode, value));
		}

		public void Emit (OpCode opcode, float value)
		{
			Append (Create (opcode, value));
		}

		public void Emit (OpCode opcode, double value)
		{
			Append (Create (opcode, value));
		}

		public void Emit (OpCode opcode, Instruction target)
		{
			Append (Create (opcode, target));
		}

		public void Emit (OpCode opcode, Instruction [] targets)
		{
			Append (Create (opcode, targets));
		}

		public void Emit (OpCode opcode, VariableDefinition variable)
		{
			Append (Create (opcode, variable));
		}

		public void Emit (OpCode opcode, ParameterDefinition parameter)
		{
			Append (Create (opcode, parameter));
		}

		public void InsertBefore (Instruction target, Instruction instruction)
		{
			if (target == null)
				throw new ArgumentNullException ("target");
			if (instruction == null)
				throw new ArgumentNullException ("instruction");

			var index = instructions.IndexOf (target);
			if (index == -1)
				throw new ArgumentOutOfRangeException ("target");

			instructions.Insert (index, instruction);
		}

		public void InsertAfter (Instruction target, Instruction instruction)
		{
			if (target == null)
				throw new ArgumentNullException ("target");
			if (instruction == null)
				throw new ArgumentNullException ("instruction");

			var index = instructions.IndexOf (target);
			if (index == -1)
				throw new ArgumentOutOfRangeException ("target");

			instructions.Insert (index + 1, instruction);
		}

		public void InsertAfter (int index, Instruction instruction)
		{
			if (index < 0 || index >= instructions.Count)
				throw new ArgumentOutOfRangeException ("index");
			if (instruction == null)
				throw new ArgumentNullException ("instruction");

			instructions.Insert (index + 1, instruction);
		}

		public void Append (Instruction instruction)
		{
			if (instruction == null)
				throw new ArgumentNullException ("instruction");

			instructions.Add (instruction);
		}

		public void Replace (Instruction target, Instruction instruction)
		{
			if (target == null)
				throw new ArgumentNullException ("target");
			if (instruction == null)
				throw new ArgumentNullException ("instruction");

			InsertAfter (target, instruction);
			Remove (target);
		}

		public void Replace (int index, Instruction instruction)
		{
			if (instruction == null)
				throw new ArgumentNullException ("instruction");

			InsertAfter (index, instruction);
			RemoveAt (index);
		}

		public void Remove (Instruction instruction)
		{
			if (instruction == null)
				throw new ArgumentNullException ("instruction");

			if (!instructions.Remove (instruction))
				throw new ArgumentOutOfRangeException ("instruction");
		}

		public void RemoveAt (int index)
		{
			if (index < 0 || index >= instructions.Count)
				throw new ArgumentOutOfRangeException ("index");

			instructions.RemoveAt (index);
		}

		public void Clear ()
		{
			instructions.Clear ();
		}
	}
}
