namespace KumiScript.Interpreter
{
    public class ProcedureExpression : Expression
    {
        readonly Procedure _proc;
        readonly bool _branching;
        public ProcedureExpression(Procedure p)
        {
            _proc = p;
            _branching = false;
        }

        public ProcedureExpression(Procedure p, bool branching)
        {
            _proc = p;
            _branching = branching;
        }

        public override Expression Eval(Environment env)
        {
            return this;
        }

        public Expression Apply(ListExpression args, Environment env)
        {
            return _proc.ApplyWithArgs(args, env);
        }

        public override string ToString()
        {
            if (_proc.IsPrimitive())
                return string.Format("#Primitive<{0}>", _proc.ToString());
            
            return string.Format("#Procedure<{0}>", _proc.ToString());
        }

        public override bool Equals(Expression expr)
        {
            ProcedureExpression? pe = expr as ProcedureExpression;
            if (pe is null)
                return false;
            
            return _proc.Equals(pe._proc);
        }

        public Procedure GetProcedure()
        {
            return _proc;
        }
    }
}