using System;
using System.Collections.Generic;
using System.Reflection.Emit;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Sunweaver.Commands.Attributes;
using Sunweaver.VM;

namespace Sunweaver.Commands
{
    /// <summary>
    /// 
    /// </summary>
    [BasePair(@"""3 b loop"" is just a shorthand mneumonic for ""3 b call 2 b call 1 b call"". " +
        @"Negative loop counts preserve sign.  eg: ""-3 b loop"" becomes " +
        @"""-3 b call -2 b call -1 b call""")]
    public class loop : Abstracts.BinaryOperation
    {
        public override void Operation(long loopCount, long coduleID)
        {
            LoopOperation(VM, loopCount, coduleID);
        }

        public static void LoopOperation(VirtualMachine VM, long loopCount, long coduleID)
        {
            for (long i = Math.Abs(loopCount); i >= 1; --i)
            {
                VM.Stack.Push(i * Math.Sign(loopCount));
                if (!call.CallOperation(VM, coduleID))
                {
                    // Fizzles, so undo and terminate
                    VM.Stack.Pop();
                    break;
                }
            }
        }

        public override void CompileOperation(ILGenerator il, Locals locals)
        {
            throw new NotImplementedException();
        }
    }
}