using System;
using LuaInterface;
using BizHawk.Emulation.Common;

namespace BizHawk.Client.Common
{
	public sealed class MemoryLuaLibrary : LuaMemoryBase
	{
		private int _currentMemoryDomain; // Main memory by default probably (index 0 is currently always main memory but may never be)

		public MemoryLuaLibrary(Lua lua)
			: base(lua) { }

		public MemoryLuaLibrary(Lua lua, Action<string> logOutputCallback)
			: base(lua, logOutputCallback) { }

		public override string Name { get { return "memory"; } }

		protected override MemoryDomain Domain
		{
			get { return Global.Emulator.MemoryDomains[_currentMemoryDomain]; }
		}

		#region Unique Library Methods

		[LuaMethodAttributes(
			"getmemorydomainlist",
			"Returns a string of the memory domains for the loaded platform core. List will be a single string delimited by line feeds"
		)]
		public LuaTable GetMemoryDomainList()
		{
			var table = Lua.NewTable();
			for (int i = 0; i < Global.Emulator.MemoryDomains.Count; i++)
			{
				table[i] = Global.Emulator.MemoryDomains[i].Name;
			}

			return table;
		}

		[LuaMethodAttributes(
			"getcurrentmemorydomain",
			"Returns a string name of the current memory domain selected by Lua. The default is Main memory"
		)]
		public string GetCurrentMemoryDomain()
		{
			return Domain.Name;
		}

		[LuaMethodAttributes(
			"getcurrentmemorydomainsize",
			"Returns the number of bytes of the current memory domain selected by Lua. The default is Main memory"
		)]
		public int GetCurrentMemoryDomainSize()
		{
			return Domain.Size;
		}

		[LuaMethodAttributes(
			"usememorydomain",
			"Attempts to set the current memory domain to the given domain. If the name does not match a valid memory domain, the function returns false, else it returns true"
		)]
		public bool UseMemoryDomain(string domain)
		{
			for (var i = 0; i < Global.Emulator.MemoryDomains.Count; i++)
			{
				if (Global.Emulator.MemoryDomains[i].Name == domain)
				{
					_currentMemoryDomain = i;
					return true;
				}
			}

			return false;
		}

		#endregion

		#region Common Special and Legacy Methods

		[LuaMethodAttributes(
			"readbyte",
			"gets the value from the given address as an unsigned byte"
		)]
		public uint ReadByte(int addr)
		{
			return ReadUnsignedByte(addr);
		}

		[LuaMethodAttributes(
			"writebyte",
			"Writes the given value to the given address as an unsigned byte"
		)]
		public void WriteByte(int addr, uint value)
		{
			WriteUnsignedByte(addr, value);
		}

		[LuaMethodAttributes(
			"readbyterange",
			"Reads the address range that starts from address, and is length long. Returns the result into a table of key value pairs (where the address is the key)."
		)]
		public new LuaTable ReadByteRange(int addr, int length)
		{
			return base.ReadByteRange(addr, length);
		}

		[LuaMethodAttributes(
			"writebyterange",
			"Writes the given values to the given addresses as unsigned bytes"
		)]
		public new void WriteByteRange(LuaTable memoryblock)
		{
			base.WriteByteRange(memoryblock);
		}

		[LuaMethodAttributes(
			"readfloat",
			"Reads the given address as a 32-bit float value from the main memory domain with th e given endian"
		)]
		public new float ReadFloat(int addr, bool bigendian)
		{
			return base.ReadFloat(addr, bigendian);
		}

		[LuaMethodAttributes(
			"writefloat",
			"Writes the given 32-bit float value to the given address and endian"
		)]
		public new void WriteFloat(int addr, double value, bool bigendian)
		{
			base.WriteFloat(addr, value, bigendian);
		}

		#endregion

		#region 1 Byte

		[LuaMethodAttributes("read_s8", "read signed byte")]
		public int ReadS8(int addr)
		{
			return (sbyte)ReadUnsignedByte(addr);
		}

		[LuaMethodAttributes("write_s8", "write signed byte")]
		public void WriteS8(int addr, uint value)
		{
			WriteUnsignedByte(addr, value);
		}

		[LuaMethodAttributes("read_u8", "read unsigned byte")]
		public uint ReadU8(int addr)
		{
			return ReadUnsignedByte(addr);
		}

		[LuaMethodAttributes("write_u8", "write unsigned byte")]
		public void WriteU8(int addr, uint value)
		{
			WriteUnsignedByte(addr, value);
		}

		#endregion

		#region 2 Byte

		[LuaMethodAttributes("read_s16_le", "read signed 2 byte value, little endian")]
		public int ReadS16Little(int addr)
		{
			return ReadSignedLittleCore(addr, 2);
		}

		[LuaMethodAttributes("write_s16_le", "write signed 2 byte value, little endian")]
		public void WriteS16Little(int addr, int value)
		{
			WriteSignedLittle(addr, value, 2);
		}

		[LuaMethodAttributes("read_s16_be", "read signed 2 byte value, big endian")]
		public int ReadS16Big(int addr)
		{
			return ReadSignedBig(addr, 2);
		}

		[LuaMethodAttributes("write_s16_be", "write signed 2 byte value, big endian")]
		public void WriteS16Big(int addr, int value)
		{
			WriteSignedBig(addr, value, 2);
		}

		[LuaMethodAttributes("read_u16_le", "read unsigned 2 byte value, little endian")]
		public uint ReadU16Little(int addr)
		{
			return ReadUnsignedLittle(addr, 2);
		}

		[LuaMethodAttributes("write_u16_le", "write unsigned 2 byte value, little endian")]
		public void WriteU16Little(int addr, uint value)
		{
			WriteUnsignedLittle(addr, value, 2);
		}

		[LuaMethodAttributes("read_u16_be", "read unsigned 2 byte value, big endian")]
		public uint ReadU16Big(int addr)
		{
			return ReadUnsignedBig(addr, 2);
		}

		[LuaMethodAttributes("write_u16_be", "write unsigned 2 byte value, big endian")]
		public void WriteU16Big(int addr, uint value)
		{
			WriteUnsignedBig(addr, value, 2);
		}

		#endregion

		#region 3 Byte

		[LuaMethodAttributes("read_s24_le", "read signed 24 bit value, little endian")]
		public int ReadS24Little(int addr)
		{
			return ReadSignedLittleCore(addr, 3);
		}

		[LuaMethodAttributes("write_s24_le", "write signed 24 bit value, little endian")]
		public void WriteS24Little(int addr, int value)
		{
			WriteSignedLittle(addr, value, 3);
		}

		[LuaMethodAttributes("read_s24_be", "read signed 24 bit value, big endian")]
		public int ReadS24Big(int addr)
		{
			return ReadSignedBig(addr, 3);
		}

		[LuaMethodAttributes("write_s24_be", "write signed 24 bit value, big endian")]
		public void WriteS24Big(int addr, int value)
		{
			WriteSignedBig(addr, value, 3);
		}

		[LuaMethodAttributes("read_u24_le", "read unsigned 24 bit value, little endian")]
		public uint ReadU24Little(int addr)
		{
			return ReadUnsignedLittle(addr, 3);
		}

		[LuaMethodAttributes("write_u24_le", "write unsigned 24 bit value, little endian")]
		public void WriteU24Little(int addr, uint value)
		{
			WriteUnsignedLittle(addr, value, 3);
		}

		[LuaMethodAttributes("read_u24_be", "read unsigned 24 bit value, big endian")]
		public uint ReadU24Big(int addr)
		{
			return ReadUnsignedBig(addr, 3);
		}

		[LuaMethodAttributes("write_u24_be", "write unsigned 24 bit value, big endian")]
		public void WriteU24Big(int addr, uint value)
		{
			WriteUnsignedBig(addr, value, 3);
		}

		#endregion

		#region 4 Byte

		[LuaMethodAttributes("read_s32_le", "read signed 4 byte value, little endian")]
		public int ReadS32Little(int addr)
		{
			return ReadSignedLittleCore(addr, 4);
		}

		[LuaMethodAttributes("write_s32_le", "write signed 4 byte value, little endian")]
		public void WriteS32Little(int addr, int value)
		{
			WriteSignedLittle(addr, value, 4);
		}

		[LuaMethodAttributes("read_s32_be", "read signed 4 byte value, big endian")]
		public int ReadS32Big(int addr)
		{
			return ReadSignedBig(addr, 4);
		}

		[LuaMethodAttributes("write_s32_be", "write signed 4 byte value, big endian")]
		public void WriteS32Big(int addr, int value)
		{
			WriteSignedBig(addr, value, 4);
		}

		[LuaMethodAttributes("read_u32_le", "read unsigned 4 byte value, little endian")]
		public uint ReadU32Little(int addr)
		{
			return ReadUnsignedLittle(addr, 4);
		}

		[LuaMethodAttributes("write_u32_le", "write unsigned 4 byte value, little endian")]
		public void WriteU32Little(int addr, uint value)
		{
			WriteUnsignedLittle(addr, value, 4);
		}

		[LuaMethodAttributes("read_u32_be", "read unsigned 4 byte value, big endian")]
		public uint ReadU32Big(int addr)
		{
			return ReadUnsignedBig(addr, 4);
		}

		[LuaMethodAttributes("write_u32_be", "write unsigned 4 byte value, big endian")]
		public void WriteU32Big(int addr, uint value)
		{
			WriteUnsignedBig(addr, value, 4);
		}

		#endregion
	}
}