#region License Information (GPL v3)

/*
    ShareX - A program that allows you to take screenshots and share any file type
    Copyright (c) 2007-2018 ShareX Team

    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License
    as published by the Free Software Foundation; either version 2
    of the License, or (at your option) any later version.

    This program 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

    Optionally you can also view the license at <http://www.gnu.org/licenses/>.
*/

#endregion License Information (GPL v3)

using System;
using System.Collections;
using System.IO;
using System.Windows.Forms;

namespace ShareX.UploadersLib
{
    /// <summary>
    /// Maintains a list of currently added file extensions
    /// </summary>
    public class IconListManager
    {
        private Hashtable _extensionList = new Hashtable();
        private ArrayList _imageLists = new ArrayList(); //will hold ImageList objects
        private IconReader.IconSize _iconSize;
        private bool ManageBothSizes; //flag, used to determine whether to create two ImageLists.

        /// <summary>
        /// Creates an instance of <c>IconListManager</c> that will add icons to a single <c>ImageList</c> using the
        /// specified <c>IconSize</c>.
        /// </summary>
        /// <param name="imageList"><c>ImageList</c> to add icons to.</param>
        /// <param name="iconSize">Size to use (either 32 or 16 pixels).</param>
        public IconListManager(ImageList imageList, IconReader.IconSize iconSize)
        {
            // Initialise the members of the class that will hold the image list we're
            // targeting, as well as the icon size (32 or 16)
            _imageLists.Add(imageList);
            _iconSize = iconSize;
        }

        /// <summary>
        /// Creates an instance of IconListManager that will add icons to two <c>ImageList</c> types. The two
        /// image lists are intended to be one for large icons, and the other for small icons.
        /// </summary>
        /// <param name="smallImageList">The <c>ImageList</c> that will hold small icons.</param>
        /// <param name="largeImageList">The <c>ImageList</c> that will hold large icons.</param>
        public IconListManager(ImageList smallImageList, ImageList largeImageList)
        {
            //add both our image lists
            _imageLists.Add(smallImageList);
            _imageLists.Add(largeImageList);

            //set flag
            ManageBothSizes = true;
        }

        /// <summary>
        /// Used internally, adds the extension to the hashtable, so that its value can then be returned.
        /// </summary>
        /// <param name="Extension"><c>String</c> of the file's extension.</param>
        /// <param name="ImageListPosition">Position of the extension in the <c>ImageList</c>.</param>
        private void AddExtension(string Extension, int ImageListPosition)
        {
            _extensionList.Add(Extension, ImageListPosition);
        }

        /// <summary>
        /// Called publicly to add a file's icon to the ImageList.
        /// </summary>
        /// <param name="filePath">Full path to the file.</param>
        /// <returns>Integer of the icon's position in the ImageList</returns>
        public int AddFileIcon(string filePath)
        {
            // Check if the file exists, otherwise, throw exception.
            if (!File.Exists(filePath)) throw new FileNotFoundException("File does not exist");

            // Split it down so we can get the extension
            string[] splitPath = filePath.Split(new Char[] { '.' });
            string extension = (string)splitPath.GetValue(splitPath.GetUpperBound(0));

            //Check that we haven't already got the extension, if we have, then
            //return back its index
            if (_extensionList.ContainsKey(extension.ToUpper()))
            {
                return (int)_extensionList[extension.ToUpper()]; //return existing index
            }

            // It's not already been added, so add it and record its position.

            int pos = ((ImageList)_imageLists[0]).Images.Count; //store current count -- new item's index

            if (ManageBothSizes)
            {
                //managing two lists, so add it to small first, then large
                ((ImageList)_imageLists[0]).Images.Add(IconReader.GetFileIcon(filePath, IconReader.IconSize.Small, false));
                ((ImageList)_imageLists[1]).Images.Add(IconReader.GetFileIcon(filePath, IconReader.IconSize.Large, false));
            }
            else
            {
                //only doing one size, so use IconSize as specified in _iconSize.
                ((ImageList)_imageLists[0]).Images.Add(IconReader.GetFileIcon(filePath, _iconSize, false)); //add to image list
            }

            AddExtension(extension.ToUpper(), pos); // add to hash table

            return pos;
        }

        /// <summary>
        /// Clears any <c>ImageLists</c> that <c>IconListManager</c> is managing.
        /// </summary>
        public void ClearLists()
        {
            foreach (ImageList imageList in _imageLists)
            {
                imageList.Images.Clear(); //clear current imagelist.
            }

            _extensionList.Clear(); //empty hashtable of entries too.
        }
    }
}