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
{
    [BasePair("Call in to a codule given its slot number.")]
    public class call : Abstracts.UnaryOperation
    {
        public override void Operation(long coduleID)
        {
            CallOperation(VM, coduleID);
        }

        /// <summary>
        /// Returns true if success, false if we had to fizzle.
        /// </summary>
        public static bool CallOperation(VirtualMachine VM, long coduleID)
        {
            // Early out when there aren't any other codules to call or calling is turned off
            if (VM.CallingChromosome == null)
            {
                return false;
            }

            Int16 actualCoduleID = VM.CallingChromosome.FindCoduleSlot(coduleID);

            // Early out if the callstack already is calling this codule
            if (VM.CallStack.Contains(actualCoduleID))
            {
                return false;
            }

            var codule = VM.CallingChromosome.Codules[actualCoduleID];

            VM.CallStack.Push(actualCoduleID);

            codule.Execute(VM);

            VM.CallStack.Pop();

            return true;
        }
    }
}