﻿/* Copyright (C) 2011  Jan Källman
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.

 * This library 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 Lesser General Public License for more details.
 *
 * The GNU Lesser General Public License can be viewed at http://www.opensource.org/licenses/lgpl-license.php
 * If you unfamiliar with this license or have questions about it, here is an http://www.gnu.org/licenses/gpl-faq.html
 *
 * All code and executables are provided "as is" with no warranty either express or implied.
 * The author accepts no liability for any damage or loss of business that this product may cause.
 *
 * Code change notes:
 *
 * Author							Change						Date
 *******************************************************************************
 * Mats Alm   		                Added		                2013-12-03
 *******************************************************************************/

using System.Collections.Generic;
using OfficeOpenXml.FormulaParsing.ExpressionGraph;
using OfficeOpenXml.Utils;

namespace OfficeOpenXml.FormulaParsing.Excel.Functions.Math;

public class Sum : HiddenValuesHandlingFunction {
  public override CompileResult Execute(
      IEnumerable<FunctionArgument> arguments,
      ParsingContext context) {
    var retVal = 0d;
    if (arguments != null) {
      foreach (var arg in arguments) {
        retVal += Calculate(arg, context);
      }
    }
    return CreateResult(retVal, DataType.Decimal);
  }

  private double Calculate(FunctionArgument arg, ParsingContext context) {
    var retVal = 0d;
    if (ShouldIgnore(arg)) {
      return retVal;
    }
    if (arg.Value is IEnumerable<FunctionArgument> value) {
      foreach (var item in value) {
        retVal += Calculate(item, context);
      }
    } else if (arg.Value is ExcelDataProvider.IRangeInfo info) {
      foreach (var c in info) {
        if (ShouldIgnore(c, context) == false) {
          CheckForAndHandleExcelError(c);
          retVal += c.ValueDouble;
        }
      }
    } else {
      CheckForAndHandleExcelError(arg);
      retVal += ConvertUtil.GetValueDouble(arg.Value, true);
    }
    return retVal;
  }
}