//
// Author:
//   Michael Göricke
//
// Copyright (c) 2019
//
// This file is part of ShapeConverter.
//
// ShapeConverter is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see<http://www.gnu.org/licenses/>.

using System;
using System.Globalization;
using EpsSharp.Eps.Core;

namespace EpsSharp.Eps.Commands.Conversion
{
    /// <summary>
    /// Cvr
    /// </summary>
    internal class CvrCmd : CommandOperand
    {
        public override void Execute(EpsInterpreter interpreter)
        {
            var operandStack = interpreter.OperandStack;

            var operand = operandStack.Pop();
            double ret;

            switch (operand)
            {
                case StringOperand stringOperand:
                {
                    ret = double.Parse(stringOperand.Value, CultureInfo.InvariantCulture);
                    break;
                }

                case IntegerOperand intOperand:
                {
                    ret = intOperand.Value;
                    break;
                }

                case RealOperand realOperand:
                {
                    ret = realOperand.Value;
                    break;
                }

                default:
                    throw new Exception("illegal operator");
            }

            var real = new RealOperand(ret);
            operandStack.Push(real);
        }
    }
}
