/*******************************************************************************
 * You may amend and distribute as you like, but don't remove this header!
 *
 * EPPlus provides server-side generation of Excel 2007/2010 spreadsheets.
 * See http://www.codeplex.com/EPPlus for details.
 *
 * 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
 * ******************************************************************************
 * Jan Källman		Added this class		        2010-01-28
 * Jan Källman		License changed GPL-->LGPL 2011-12-27
 *******************************************************************************/

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

namespace OfficeOpenXml;

/// <summary>
/// Collection for named ranges
/// </summary>
public class ExcelNamedRangeCollection : IEnumerable<ExcelNamedRange> {
  internal ExcelWorksheet _ws;
  internal ExcelWorkbook _wb;

  internal ExcelNamedRangeCollection(ExcelWorkbook wb) {
    _wb = wb;
    _ws = null;
  }

  internal ExcelNamedRangeCollection(ExcelWorkbook wb, ExcelWorksheet ws) {
    _wb = wb;
    _ws = ws;
  }

  private readonly List<ExcelNamedRange> _list = new();
  private readonly Dictionary<string, int> _dic = new(StringComparer.InvariantCultureIgnoreCase);

  /// <summary>
  /// Add a new named range
  /// </summary>
  /// <param name="name">The name</param>
  /// <param name="range">The range</param>
  /// <returns></returns>
  public ExcelNamedRange Add(string name, ExcelRangeBase range) {
    ExcelNamedRange item;
    if (range.IsName) {
      item = new(name, _wb, _ws, _dic.Count);
    } else {
      item = new(name, _ws, range.Worksheet, range.Address, _dic.Count);
    }

    AddName(name, item);

    return item;
  }

  private void AddName(string name, ExcelNamedRange item) {
    // Is 'Name' already present
    if (_dic.ContainsKey(name)) {
      int index = _dic[name];
      if ((0 <= index) && (index < _list.Count)) {
        ExcelNamedRange listItem = _list[index];
        if ((listItem != null)
            && (listItem.FullAddress != null)
            && (listItem.FullAddress == item.FullAddress)) {
          return;
        }

        //throw new Exception(string.Format("Name '{0}' is defined in the worksheet more than once. First as '{1}' and second as '{2}'.", Name, listItem.FullAddress, item.FullAddress));
        return;
      }

      //throw new Exception(string.Format("Name '{0}' is defined in the worksheet more than once.", Name));
      return;
    }

    _dic.Add(name, _list.Count);
    _list.Add(item);
  }

  /// <summary>
  /// Add a defined name referencing value
  /// </summary>
  /// <param name="name"></param>
  /// <param name="value"></param>
  /// <returns></returns>
  public ExcelNamedRange AddValue(string name, object value) {
    var item = new ExcelNamedRange(name, _wb, _ws, _dic.Count);
    item.NameValue = value;
    AddName(name, item);
    return item;
  }

  /// <summary>
  /// Add a defined name referencing a formula -- the method name contains a typo.
  /// This method is obsolete and will be removed in the future.
  /// Use <see cref="AddFormula"/>
  /// </summary>
  /// <param name="name"></param>
  /// <param name="formula"></param>
  /// <returns></returns>
  [Obsolete("Call AddFormula() instead.  See Issue Tracker Id #14687")]
  public ExcelNamedRange AddFormla(string name, string formula) {
    return AddFormula(name, formula);
  }

  /// <summary>
  /// Add a defined name referencing a formula
  /// </summary>
  /// <param name="name"></param>
  /// <param name="formula"></param>
  /// <returns></returns>
  public ExcelNamedRange AddFormula(string name, string formula) {
    var item = new ExcelNamedRange(name, _wb, _ws, _dic.Count);
    item.NameFormula = formula;
    AddName(name, item);
    return item;
  }

  /// <summary>
  /// Remove a defined name from the collection
  /// </summary>
  /// <param name="name">The name</param>
  public void Remove(string name) {
    if (_dic.ContainsKey(name)) {
      var ix = _dic[name];

      for (int i = ix + 1; i < _list.Count; i++) {
        _dic.Remove(_list[i].Name);
        _list[i].Index--;
        _dic.Add(_list[i].Name, _list[i].Index);
      }
      _dic.Remove(name);
      _list.RemoveAt(ix);
    }
  }

  /// <summary>
  /// Checks collection for the presence of a key
  /// </summary>
  /// <param name="key">key to search for</param>
  /// <returns>true if the key is in the collection</returns>
  public bool ContainsKey(string key) {
    return _dic.ContainsKey(key);
  }

  /// <summary>
  /// The current number of items in the collection
  /// </summary>
  public int Count => _dic.Count;

  /// <summary>
  /// Name indexer
  /// </summary>
  /// <param name="name">The name (key) for a Named range</param>
  /// <returns>a reference to the range</returns>
  /// <remarks>
  /// Throws a KeyNotFoundException if the key is not in the collection.
  /// </remarks>
  public ExcelNamedRange this[string name] => _list[_dic[name]];

  public ExcelNamedRange this[int index] => _list[index];

  /// <summary>
  /// Implement interface method IEnumerator&lt;ExcelNamedRange&gt; GetEnumerator()
  /// </summary>
  /// <returns></returns>
  public IEnumerator<ExcelNamedRange> GetEnumerator() {
    return _list.GetEnumerator();
  }

  /// <summary>
  /// Implement interface method IEnumeratable GetEnumerator()
  /// </summary>
  /// <returns></returns>
  IEnumerator IEnumerable.GetEnumerator() {
    return _list.GetEnumerator();
  }

  internal void Clear() {
    while (Count > 0) {
      Remove(_list[0].Name);
    }
  }
}