#region MigraDoc - Creating Documents on the Fly
//
// Authors:
//   Stefan Lange
//   Klaus Potzesny
//   David Stephensen
//
// Copyright (c) 2001-2017 empira Software GmbH, Cologne Area (Germany)
//
// http://www.pdfsharp.com
// http://www.migradoc.com
// http://sourceforge.net/projects/pdfsharp
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
// DEALINGS IN THE SOFTWARE.
#endregion

using System;
using MigraDoc.DocumentObjectModel.publics;

namespace MigraDoc.DocumentObjectModel.Tables
{
    /// <summary>
    /// Represents the collection of all cells of a row.
    /// </summary>
    public class Cells : DocumentObjectCollection
    {
        /// <summary>
        /// Initializes a new instance of the Cells class.
        /// </summary>
        public Cells()
        { }

        /// <summary>
        /// Initializes a new instance of the Cells class with the specified parent.
        /// </summary>
        public Cells(DocumentObject parent) : base(parent) { }

        #region Methods
        /// <summary>
        /// Creates a deep copy of this object.
        /// </summary>
        public new Cells Clone()
        {
            Cells cells = (Cells)base.DeepCopy();
            cells.ResetCachedValues();
            return cells;
        }

        /// <summary>
        /// Resets the cached values.
        /// </summary>
        public override void ResetCachedValues()
        {
            base.ResetCachedValues();
            _row = null;
            _table = null;
        }
        #endregion

        #region Properties
        /// <summary>
        /// Gets the table the cells collection belongs to.
        /// </summary>
        public Table Table
        {
            get
            {
                if (_table == null)
                {
                    Row rw = Parent as Row;
                    if (rw != null)
                        _table = rw.Table;
                }
                return _table;
            }
        }
        Table _table;

        /// <summary>
        /// Gets the row the cells collection belongs to.
        /// </summary>
        public Row Row
        {
            get { return _row ?? (_row = Parent as Row); }
        }
        Row _row;

        /// <summary>
        /// Gets a cell by its index. The first cell has the index 0.
        /// </summary>
        public new Cell this[int index]
        {
            get
            {
                if (index < 0 || (Table != null && index >= Table.Columns.Count))
                    throw new ArgumentOutOfRangeException("index");

                Resize(index);
                return base[index] as Cell;
            }
        }
        #endregion

        /// <summary>
        /// Resizes this cells' list if necessary.
        /// </summary>
        private void Resize(int index)
        {
            for (int currentIndex = Count; currentIndex <= index; currentIndex++)
                Add(new Cell());
        }

        #region public
        /// <summary>
        /// Converts Cells into DDL.
        /// </summary>
        public override void Serialize(Serializer serializer)
        {
            int cells = Count;
            for (int cell = 0; cell < cells; cell++)
                this[cell].Serialize(serializer);
        }

        /// <summary>
        /// Returns the meta object of this instance.
        /// </summary>
        public override Meta Meta
        {
            get { return _meta ?? (_meta = new Meta(typeof(Cells))); }
        }
        static Meta _meta;
        #endregion
    }
}
