﻿/* 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 System.Linq;

namespace AppsheetEpplus;

/// <summary>
/// Base class for functions that needs to handle cells that is not visible.
/// </summary>
public abstract class HiddenValuesHandlingFunction : ExcelFunction {
  /// <summary>
  /// Set to true or false to indicate whether the function should ignore hidden values.
  /// </summary>
  public bool IgnoreHiddenValues { get; set; }

  protected override IEnumerable<double> ArgsToDoubleEnumerable(
      IEnumerable<FunctionArgument> arguments,
      ParsingContext context) {
    return ArgsToDoubleEnumerable(arguments, context, true);
  }

  protected IEnumerable<double> ArgsToDoubleEnumerable(
      IEnumerable<FunctionArgument> arguments,
      ParsingContext context,
      bool ignoreErrors) {
    if (!arguments.Any()) {
      return [];
    }
    if (IgnoreHiddenValues) {
      var nonHidden = arguments.Where(x => !x.ExcelStateFlagIsSet(ExcelCellState.HiddenCell));
      return base.ArgsToDoubleEnumerable(IgnoreHiddenValues, nonHidden, context);
    }
    return base.ArgsToDoubleEnumerable(IgnoreHiddenValues, ignoreErrors, arguments, context);
  }

  protected bool ShouldIgnore(ExcelDataProvider.ICellInfo c, ParsingContext context) {
    return CellStateHelper.ShouldIgnore(IgnoreHiddenValues, c, context);
  }

  protected bool ShouldIgnore(FunctionArgument arg) {
    if (IgnoreHiddenValues && arg.ExcelStateFlagIsSet(ExcelCellState.HiddenCell)) {
      return true;
    }
    return false;
  }
}