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)
        {
            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] = (byte)((vm.Memory[vm.MemoryPointer] +255) % 256);
            });
            vm.RegisterCommand('>', b => {
                vm.MemoryPointer = (vm.MemoryPointer + 1)%vm.Memory.Length;
            });
            vm.RegisterCommand('<', b => {
                vm.MemoryPointer = (vm.MemoryPointer - 1 + vm.Memory.Length) %vm.Memory.Length;
            });
            vm.RegisterCommand(',', b => {
                vm.Memory[vm.MemoryPointer] = Convert.ToByte(read());
            });
            var abc = "QWERTYUIOPASDFGHJKLZXCVBNMqwertyuiopasdfghjklzxcvbnm1234567890";
            foreach (var symbol in abc)
                vm.RegisterCommand(symbol, b => { vm.Memory[vm.MemoryPointer] = Convert.ToByte(symbol); });
        }
    }
}