using System;
using System.Collections.Generic;
using System.Text;

namespace LuaInterface
{
    public class LuaFunction : LuaBase
    {
        //private Lua interpreter;
        internal LuaCSFunction function;
        //internal int reference;

        public LuaFunction(int reference, LuaState interpreter)
        {
            _Reference = reference;
            this.function = null;
            _Interpreter = interpreter;
        }

        public LuaFunction(LuaCSFunction function, LuaState interpreter)
        {
            _Reference = 0;
            this.function = function;
            _Interpreter = interpreter;
        }

        //~LuaFunction()
        //{
        //    if (reference != 0)
        //        interpreter.dispose(reference);
        //}

        //bool disposed = false;
        //~LuaFunction()
        //{
        //    Dispose(false);
        //}

        //public void Dispose()
        //{
        //    Dispose(true);
        //    GC.SuppressFinalize(this);
        //}

        //public virtual void Dispose(bool disposeManagedResources)
        //{
        //    if (!this.disposed)
        //    {
        //        if (disposeManagedResources)
        //        {
        //            if (_Reference != 0)
        //                _Interpreter.dispose(_Reference);
        //        }

        //        disposed = true;
        //    }
        //}


        /*
         * Calls the function casting return values to the types
         * in returnTypes
         */
        internal object[] call(object[] args, Type[] returnTypes)
        {
            return _Interpreter.callFunction(this, args, returnTypes);
        }
        /*
         * Calls the function and returns its return values inside
         * an array
         */
        public object[] Call(params object[] args)
        {
            return _Interpreter.callFunction(this, args);
        }
        /*
         * Pushes the function into the Lua stack
         */
        internal void push(IntPtr luaState)
        {
            if (_Reference != 0)
                LuaDLL.lua_getref(luaState, _Reference);
            else
                _Interpreter.pushCSFunction(function);
        }
        public override string ToString()
        {
            return "function";
        }
        public override bool Equals(object o)
        {
            if (o is LuaFunction)
            {
                LuaFunction l = (LuaFunction)o;
                if (this._Reference != 0 && l._Reference != 0)
                    return _Interpreter.compareRef(l._Reference, this._Reference);
                else
                    return this.function == l.function;
            }
            else return false;
        }
        public override int GetHashCode()
        {
            if (_Reference != 0)
                return _Reference;
            else
                return function.GetHashCode();
        }
    }

}