using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using Essgee.Exceptions;

namespace Essgee.Emulation.Cartridges.Coleco
{
	public class ColecoCartridge : ICartridge
	{
		// TODO: http://atariage.com/forums/topic/210168-colecovision-bank-switching/ ?

		byte[] romData;

		public ColecoCartridge(int romSize, int ramSize)
		{
			romData = new byte[romSize];
		}

		public void LoadRom(byte[] data)
		{
			Buffer.BlockCopy(data, 0, romData, 0, Math.Min(data.Length, romData.Length));
		}

		public void LoadRam(byte[] data)
		{
			//
		}

		public byte[] GetRomData()
		{
			return romData;
		}

		public byte[] GetRamData()
		{
			return null;
		}

		public bool IsRamSaveNeeded()
		{
			return false;
		}

		public ushort GetLowerBound()
		{
			return 0x0000;
		}

		public ushort GetUpperBound()
		{
			return (ushort)(romData.Length - 1);
		}

		public void Step(int clockCyclesInStep)
		{
			/* Nothing to do */
		}

		public byte Read(ushort address)
		{
			if (address <= 0x1FFF)
			{
				/* BIOS */
				return romData[address & 0x1FFF];
			}
			else
			{
				/* Cartridge */
				address -= 0x8000;
				if (address >= romData.Length) address -= (ushort)romData.Length;
				return romData[address];
			}
		}

		public void Write(ushort address, byte value)
		{
			/* Cannot write to cartridge */
			return;
		}
	}
}