using System;
using System.Collections.Generic;
using System.Reflection.Emit;
using System.Text;
using Sunweaver.Commands.Abstracts;

namespace Sunweaver.DataPrototypes
{
    public class Codule
    {
        public List<BasePair> BasePairs;

        private delegate void ExecuteDelegate(VirtualMachine VM);
        private ExecuteDelegate Run;

        public Codule(List<BasePair> dna)
        {
            BasePairs = dna;
            Run = Interpret;
        }

        public Codule()
        {
            BasePairs = new List<BasePair>();
            Run = Interpret;
        }

        public void Execute(VirtualMachine VM)
        {
            Run(VM);
        }

        public void Interpret(VirtualMachine VM)
        {
            foreach(BasePair bp in BasePairs)
            {
                //TODO: Move these to the bp.Implementation
                if (bp.ToString() == "stop")
                    VM.Executing = false;
                else if (bp.ToString() == "start")
                    VM.Executing = true;
                
                if(VM.Executing)
                    bp.Implementation(VM);
            }
        }

        public void Compile()
        {
            var method = new DynamicMethod(string.Empty, typeof(void),
                new Type[] { typeof(Codule), typeof(VirtualMachine) },
                typeof(Codule).Module);

            ILGenerator il = method.GetILGenerator();
            Locals locals = new Locals(il);
            il.Emit(OpCodes.Ldarg_1);
            il.Emit(OpCodes.Stloc, locals[typeof(VirtualMachine)]);

            Compile(il, locals);

            il.Emit(OpCodes.Ret);
            Run = (ExecuteDelegate) method.CreateDelegate(typeof(ExecuteDelegate), this); 
        }

        internal void Compile(ILGenerator il, Locals locals)
        {
            //TODO: Find a better way to do this
            bool executing = true;

            foreach (BasePair bp in BasePairs)
            {
                if (bp.ToString() == "stop")
                    executing = false;
                else if (bp.ToString() == "start")
                    executing = true;

                if (executing)
                    bp.Compile(il, locals);
            }
        }

        public override bool Equals(object obj)
        {
            if (!obj.GetType().Equals(this.GetType()))
            {
                return false;
            }
            Codule c = (Codule)obj;

            if (this.BasePairs.Count != c.BasePairs.Count)
            {
                return false;
            }

            for (int i = 0; i < this.BasePairs.Count; i++)
            {
                if(!this.BasePairs[i].ToString().Equals(c.BasePairs[i].ToString())){
                    return false;
                }
            }
            return true;
        }

        public override int GetHashCode()
        {
            return base.GetHashCode();
        }
    }
}