/*
    Copyright (C) 2018-2019 de4dot@gmail.com

    This file is part of Iced.

    Iced is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    Iced is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with Iced.  If not, see <https://www.gnu.org/licenses/>.
*/

#if !NO_INSTR_INFO
using System.Diagnostics;
using System.Text;

namespace Iced.Intel {
	/// <summary>
	/// A memory location used by an instruction
	/// </summary>
	public readonly struct UsedMemory {
		readonly ulong displ;
		readonly byte segReg;
		readonly byte baseReg;
		readonly byte indexReg;
		readonly byte memorySize;
		readonly byte scale;
		readonly byte access;

		/// <summary>
		/// Effective segment register
		/// </summary>
		public Register Segment => (Register)segReg;

		/// <summary>
		/// Base register or <see cref="Register.None"/> if none
		/// </summary>
		public Register Base => (Register)baseReg;

		/// <summary>
		/// Index register or <see cref="Register.None"/> if none
		/// </summary>
		public Register Index => (Register)indexReg;

		/// <summary>
		/// Index scale (1, 2, 4 or 8)
		/// </summary>
		public int Scale => scale;

		/// <summary>
		/// Displacement
		/// </summary>
		public ulong Displacement => displ;

		/// <summary>
		/// Size of location
		/// </summary>
		public MemorySize MemorySize => (MemorySize)memorySize;

		/// <summary>
		/// Memory access
		/// </summary>
		public OpAccess Access => (OpAccess)access;

		/// <summary>
		/// Constructor
		/// </summary>
		/// <param name="segReg">Segment register</param>
		/// <param name="baseReg">Base register</param>
		/// <param name="indexReg">Index register</param>
		/// <param name="scale">Scale, 1, 2, 4 or 8</param>
		/// <param name="displ">Displacement</param>
		/// <param name="memorySize">Memory size</param>
		/// <param name="access">Access</param>
		public UsedMemory(Register segReg, Register baseReg, Register indexReg, int scale, long displ, MemorySize memorySize, OpAccess access) {
			this.displ = (ulong)displ;
			Debug.Assert((uint)segReg <= byte.MaxValue);
			this.segReg = (byte)segReg;
			Debug.Assert((uint)baseReg <= byte.MaxValue);
			this.baseReg = (byte)baseReg;
			Debug.Assert((uint)indexReg <= byte.MaxValue);
			this.indexReg = (byte)indexReg;
			Debug.Assert((uint)memorySize <= byte.MaxValue);
			this.memorySize = (byte)memorySize;
			Debug.Assert(scale == 1 || scale == 2 || scale == 4 || scale == 8);
			this.scale = (byte)scale;
			Debug.Assert((uint)access <= byte.MaxValue);
			this.access = (byte)access;
		}

		/// <summary>
		/// Constructor
		/// </summary>
		/// <param name="segReg">Segment register</param>
		/// <param name="baseReg">Base register</param>
		/// <param name="indexReg">Index register</param>
		/// <param name="scale">Scale, 1, 2, 4 or 8</param>
		/// <param name="displ">Displacement</param>
		/// <param name="memorySize">Memory size</param>
		/// <param name="access">Access</param>
		public UsedMemory(Register segReg, Register baseReg, Register indexReg, int scale, ulong displ, MemorySize memorySize, OpAccess access) {
			this.displ = displ;
			Debug.Assert((uint)segReg <= byte.MaxValue);
			this.segReg = (byte)segReg;
			Debug.Assert((uint)baseReg <= byte.MaxValue);
			this.baseReg = (byte)baseReg;
			Debug.Assert((uint)indexReg <= byte.MaxValue);
			this.indexReg = (byte)indexReg;
			Debug.Assert((uint)memorySize <= byte.MaxValue);
			this.memorySize = (byte)memorySize;
			Debug.Assert(scale == 1 || scale == 2 || scale == 4 || scale == 8);
			this.scale = (byte)scale;
			Debug.Assert((uint)access <= byte.MaxValue);
			this.access = (byte)access;
		}

		/// <summary>
		/// ToString()
		/// </summary>
		/// <returns></returns>
		public override string ToString() {
			var sb = new StringBuilder();
			sb.Append('[');
			sb.Append(Segment.ToString());
			sb.Append(':');
			bool needPlus = false;
			if (Base != Register.None) {
				sb.Append(Base.ToString());
				needPlus = true;
			}
			if (Index != Register.None) {
				if (needPlus)
					sb.Append('+');
				needPlus = true;
				sb.Append(Index.ToString());
				if (Scale != 1) {
					sb.Append('*');
					sb.Append((char)('0' + Scale));
				}
			}
			if (Displacement != 0 || !needPlus) {
				if (needPlus)
					sb.Append('+');
				if (Displacement <= 9)
					sb.Append(Displacement.ToString());
				else {
					sb.Append("0x");
					sb.Append(Displacement.ToString("X"));
				}
			}
			sb.Append(';');
			sb.Append(MemorySize.ToString());
			sb.Append(';');
			sb.Append(Access.ToString());
			sb.Append(']');
			return sb.ToString();
		}
	}
}
#endif