/*******************************************************************************
 * 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		Initial Release		        2010-06-01
 * Jan Källman		License changed GPL-->LGPL 2011-12-16
 *******************************************************************************/
using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;
using System.Collections;

namespace OfficeOpenXml.Drawing.Vml
{
    internal class ExcelVmlDrawingCommentCollection : ExcelVmlDrawingBaseCollection, IEnumerable
    {
        internal RangeCollection _drawings;
        internal ExcelVmlDrawingCommentCollection(ExcelPackage pck, ExcelWorksheet ws, Uri uri) :
            base(pck, ws,uri)
        {
            if (uri == null)
            {
                VmlDrawingXml.LoadXml(CreateVmlDrawings());
                _drawings = new RangeCollection(new List<IRangeID>());
            }
            else
            {
                AddDrawingsFromXml(ws);
            }
        }
        protected void AddDrawingsFromXml(ExcelWorksheet ws)
        {
            var nodes = VmlDrawingXml.SelectNodes("//v:shape", NameSpaceManager);
            var list = new List<IRangeID>();
            foreach (XmlNode node in nodes)
            {
                var rowNode = node.SelectSingleNode("x:ClientData/x:Row", NameSpaceManager);
                var colNode = node.SelectSingleNode("x:ClientData/x:Column", NameSpaceManager);
                if (rowNode != null && colNode != null)
                {
                    var row = int.Parse(rowNode.InnerText) + 1;
                    var col = int.Parse(colNode.InnerText) + 1;
                    list.Add(new ExcelVmlDrawingComment(node, ws.Cells[row, col], NameSpaceManager));
                }
                else
                {
                    list.Add(new ExcelVmlDrawingComment(node, ws.Cells[1, 1], NameSpaceManager));
                }
            }
            list.Sort(new Comparison<IRangeID>((r1, r2) => (r1.RangeID < r2.RangeID ? -1 : r1.RangeID > r2.RangeID ? 1 : 0)));  //Vml drawings are not sorted. Sort to avoid missmatches.
            _drawings = new RangeCollection(list);
        }
        private string CreateVmlDrawings()
        {
            string vml=string.Format("<xml xmlns:v=\"{0}\" xmlns:o=\"{1}\" xmlns:x=\"{2}\">", 
                ExcelPackage.schemaMicrosoftVml, 
                ExcelPackage.schemaMicrosoftOffice, 
                ExcelPackage.schemaMicrosoftExcel);
            
             vml+="<o:shapelayout v:ext=\"edit\">";
             vml+="<o:idmap v:ext=\"edit\" data=\"1\"/>";
             vml+="</o:shapelayout>";

             vml+="<v:shapetype id=\"_x0000_t202\" coordsize=\"21600,21600\" o:spt=\"202\" path=\"m,l,21600r21600,l21600,xe\">";
             vml+="<v:stroke joinstyle=\"miter\" />";
             vml+="<v:path gradientshapeok=\"t\" o:connecttype=\"rect\" />";
             vml+="</v:shapetype>";
             vml+= "</xml>";

            return vml;
        }
        internal ExcelVmlDrawingComment Add(ExcelRangeBase cell)
        {
            XmlNode node = AddDrawing(cell);
            var draw = new ExcelVmlDrawingComment(node, cell, NameSpaceManager);            
            _drawings.Add(draw);
            return draw;
        }
        private XmlNode AddDrawing(ExcelRangeBase cell)
        {
            int row = cell.Start.Row, col = cell.Start.Column;
            var node = VmlDrawingXml.CreateElement("v", "shape", ExcelPackage.schemaMicrosoftVml);

            var id = ExcelCellBase.GetCellID(cell.Worksheet.SheetID, cell._fromRow, cell._fromCol);
            var ix = _drawings.IndexOf(id);
            if (ix < 0 && (~ix < _drawings.Count))
            {
                ix = ~ix;
                var prevDraw = _drawings[ix] as ExcelVmlDrawingBase;
                prevDraw.TopNode.ParentNode.InsertBefore(node, prevDraw.TopNode);
            }
            else
            {
                VmlDrawingXml.DocumentElement.AppendChild(node);
            }

            node.SetAttribute("id", GetNewId());
            node.SetAttribute("type", "#_x0000_t202");
            node.SetAttribute("style", "position:absolute;z-index:1; visibility:hidden");
            //node.SetAttribute("style", "position:absolute; margin-left:59.25pt;margin-top:1.5pt;width:108pt;height:59.25pt;z-index:1; visibility:hidden"); 
            node.SetAttribute("fillcolor", "#ffffe1");
            node.SetAttribute("insetmode",ExcelPackage.schemaMicrosoftOffice,"auto");

            string vml = "<v:fill color2=\"#ffffe1\" />";
            vml += "<v:shadow on=\"t\" color=\"black\" obscured=\"t\" />";
            vml += "<v:path o:connecttype=\"none\" />";
            vml += "<v:textbox style=\"mso-direction-alt:auto\">";
            vml += "<div style=\"text-align:left\" />";
            vml += "</v:textbox>";
            vml += "<x:ClientData ObjectType=\"Note\">";
            vml += "<x:MoveWithCells />";
            vml += "<x:SizeWithCells />";
            vml += string.Format("<x:Anchor>{0}, 15, {1}, 2, {2}, 31, {3}, 1</x:Anchor>", col, row - 1, col + 2, row + 3);
            vml += "<x:AutoFill>False</x:AutoFill>";
            vml += string.Format("<x:Row>{0}</x:Row>", row - 1); ;
            vml += string.Format("<x:Column>{0}</x:Column>", col - 1);
            vml += "</x:ClientData>";

            node.InnerXml = vml;
            return node;
        }
        int _nextID = 0;
        /// <summary>
        /// returns the next drawing id.
        /// </summary>
        /// <returns></returns>
        internal string GetNewId()
        {
            if (_nextID == 0)
            {
                foreach (ExcelVmlDrawingComment draw in this)
                {
                    if (draw.Id.Length > 3 && draw.Id.StartsWith("vml"))
                    {
                        int id;
                        if (int.TryParse(draw.Id.Substring(3, draw.Id.Length - 3), out id))
                        {
                            if (id > _nextID)
                            {
                                _nextID = id;
                            }
                        }
                    }
                }
            }
            _nextID++;
            return "vml" + _nextID.ToString();
        }
        internal ExcelVmlDrawingBase this[ulong rangeID]
        {
            get
            {
                return _drawings[rangeID] as ExcelVmlDrawingComment;
            }
        }
        internal bool ContainsKey(ulong rangeID)
        {
            return _drawings.ContainsKey(rangeID);
        }
        internal int Count
        {
            get
            {
                return _drawings.Count;
            }
        }
        #region IEnumerable Members

        #endregion

        public IEnumerator GetEnumerator()
        {
            return _drawings;
        }

        IEnumerator IEnumerable.GetEnumerator()
        {
            return _drawings;
        }
    }
}