using System;
using System.Collections.Generic;
using System.Linq;

namespace func.brainfuck
{
	public class BrainfuckBasicCommands
	{
		public static void RegisterTo(IVirtualMachine vm, Func<int> read, Action<char> write)
		{
            char[] chars = "QWERTYUIOPASDFGHJKLZXCVBNMqwertyuiopasdfghjklzxcvbnm1234567890".ToCharArray();
            vm.RegisterCommand('.', b => { write(Convert.ToChar(vm.Memory[vm.MemoryPointer])); });
			vm.RegisterCommand('+', b => { vm.Memory[vm.MemoryPointer]= (byte)((vm.Memory[vm.MemoryPointer]+1)%256); });
			vm.RegisterCommand('-', b => { vm.Memory[vm.MemoryPointer] = vm.Memory[vm.MemoryPointer] == 0 ? vm.Memory[vm.MemoryPointer] = 255
            :  (byte)(vm.Memory[vm.MemoryPointer] - 1); });
            vm.RegisterCommand(',', b => { vm.Memory[vm.MemoryPointer] = (byte)read(); });
            vm.RegisterCommand('>', b => { vm.MemoryPointer = (vm.MemoryPointer + 1)%256; });
            vm.RegisterCommand('<', b => { vm.MemoryPointer = (vm.MemoryPointer +256 -1)%256; });

            foreach (var char1 in chars)
                vm.RegisterCommand(char1, b => { vm.Memory[vm.MemoryPointer] = (byte)char1; });
        }
	}
}