/*

 * Copyright (c) Contributors, http://aurora-sim.org/, http://opensimulator.org/

 * See CONTRIBUTORS.TXT for a full list of copyright holders.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *     * Redistributions of source code must retain the above copyright

 *       notice, this list of conditions and the following disclaimer.

 *     * Redistributions in binary form must reproduce the above copyright

 *       notice, this list of conditions and the following disclaimer in the

 *       documentation and/or other materials provided with the distribution.

 *     * Neither the name of the Aurora-Sim Project nor the

 *       names of its contributors may be used to endorse or promote products

 *       derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY

 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

 * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY

 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */



using Aurora.Framework;

using System;

using System.Drawing;

using System.Drawing.Imaging;

using System.IO;

using Aurora.Framework.ConsoleFramework;

using Aurora.Framework.Modules;

using Aurora.Framework.SceneInfo;



namespace Aurora.Modules.Terrain.FileLoaders

{

    /// <summary>

    ///     A virtual class designed to have methods overloaded,

    ///     this class provides an interface for a generic image

    ///     saving and loading mechanism, but does not specify the

    ///     format. It should not be insubstantiated directly.

    /// </summary>

    public class GenericSystemDrawing : ITerrainLoader

    {

        #region ITerrainLoader Members



        public string FileExtension

        {

            get { return ".gsd"; }

        }



        /// <summary>

        ///     Loads a file from a specified filename on the disk,

        ///     parses the image using the System.Drawing parsers

        ///     then returns a terrain channel. Values are

        ///     returned based on HSL brightness between 0m and 128m

        /// </summary>

        /// <param name="filename">The target image to load</param>

        /// <param name="scene"></param>

        /// <returns>A terrain channel generated from the image.</returns>

        public virtual ITerrainChannel LoadFile(string filename, IScene scene)

        {

            return LoadBitmap(new Bitmap(filename));

        }



        public ITerrainChannel LoadFile(string filename, int x, int y, int fileWidth, int fileHeight, int w, int h)

        {

            // [[THEMAJOR]] Some work on tile loading..

            // terrain load-tile Tile.png 5 5 10000 10050

            Bitmap tilemap = new Bitmap(filename);



            // Prevents off-by-one issue

            fileHeight--;



            int xoffset = w*x;

            int yoffset = h*(fileHeight - y);



            //MainConsole.Instance.DebugFormat(

            //    "[TERRAIN]: Loading tile {0},{1} (offset {2},{3}) from tilemap size of {4},{5}",

            //    x, y, xoffset, yoffset, fileWidth, fileHeight);



            Rectangle tileRect = new Rectangle(xoffset, yoffset, w, h);

            PixelFormat format = tilemap.PixelFormat;

            Bitmap cloneBitmap = null;

            try

            {

                cloneBitmap = tilemap.Clone(tileRect, format);

            }

            catch (OutOfMemoryException e)

            {

                // This error WILL appear if the number of Y tiles is too high because of how it works from the bottom up

                // However, this still spits out ugly unreferenced object errors on the console

                MainConsole.Instance.ErrorFormat(

                    "[TERRAIN]: Couldn't load tile {0},{1} (from bitmap coordinates {2},{3}). Number of specified Y tiles may be too high: {4}",

                    x, y, xoffset, yoffset, e);

            }

            finally

            {

                // Some attempt at keeping a clean memory

                tilemap.Dispose();

            }



            return LoadBitmap(cloneBitmap);

        }



        public virtual ITerrainChannel LoadStream(Stream stream, IScene scene)

        {

            return LoadBitmap(new Bitmap(stream));

        }



        /// <summary>

        ///     Exports a file to a image on the disk using a System.Drawing exporter.

        /// </summary>

        /// <param name="filename">The target filename</param>

        /// <param name="map">The terrain channel being saved</param>

        public virtual void SaveFile(string filename, ITerrainChannel map)

        {

            Bitmap colours = CreateGrayscaleBitmapFromMap(map);



            colours.Save(filename, ImageFormat.Png);

        }



        /// <summary>

        ///     Exports a stream using a System.Drawing exporter.

        /// </summary>

        /// <param name="stream">The target stream</param>

        /// <param name="map">The terrain channel being saved</param>

        public virtual void SaveStream(Stream stream, ITerrainChannel map)

        {

            Bitmap colours = CreateGrayscaleBitmapFromMap(map);



            colours.Save(stream, ImageFormat.Png);

        }



        #endregion



        protected virtual ITerrainChannel LoadBitmap(Bitmap bitmap)

        {

            ITerrainChannel retval = new TerrainChannel(bitmap.Width, bitmap.Height, null);



            int x;

            for (x = 0; x < bitmap.Width; x++)

            {

                int y;

                for (y = 0; y < bitmap.Height; y++)

                {

                    retval[x, y] = bitmap.GetPixel(x, bitmap.Height - y - 1).GetBrightness()*128;

                }

            }



            return retval;

        }



        public override string ToString()

        {

            return "SYS.DRAWING";

        }



        /// <summary>

        ///     Protected method, generates a grayscale bitmap

        ///     image from a specified terrain channel.

        /// </summary>

        /// <param name="map">The terrain channel to export to bitmap</param>

        /// <returns>A System.Drawing.Bitmap containing a grayscale image</returns>

        protected static Bitmap CreateGrayscaleBitmapFromMap(ITerrainChannel map)

        {

            Bitmap bmp = new Bitmap(map.Width, map.Height);



            const int pallete = 256;



            Color[] grays = new Color[pallete];

            for (int i = 0; i < grays.Length; i++)

            {

                grays[i] = Color.FromArgb(i, i, i);

            }



            for (int y = 0; y < map.Height; y++)

            {

                for (int x = 0; x < map.Width; x++)

                {

                    // 512 is the largest possible height before colours clamp

                    int colorindex = (int) (Math.Max(Math.Min(1.0, map[x, y]/128.0), 0.0)*(pallete - 1));



                    // Handle error conditions

                    if (colorindex > pallete - 1 || colorindex < 0)

                        bmp.SetPixel(x, map.Height - y - 1, Color.Red);

                    else

                        bmp.SetPixel(x, map.Height - y - 1, grays[colorindex]);

                }

            }

            return bmp;

        }



        /// <summary>

        ///     Protected method, generates a coloured bitmap

        ///     image from a specified terrain channel.

        /// </summary>

        /// <param name="map">The terrain channel to export to bitmap</param>

        /// <returns>A System.Drawing.Bitmap containing a coloured image</returns>

        protected static Bitmap CreateBitmapFromMap(ITerrainChannel map)

        {

            Bitmap gradientmapLd = new Bitmap("defaultstripe.png");



            int pallete = gradientmapLd.Height;



            Bitmap bmp = new Bitmap(map.Width, map.Height);

            Color[] colours = new Color[pallete];



            for (int i = 0; i < pallete; i++)

            {

                colours[i] = gradientmapLd.GetPixel(0, i);

            }



            for (int y = 0; y < map.Height; y++)

            {

                for (int x = 0; x < map.Width; x++)

                {

                    // 512 is the largest possible height before colours clamp

                    int colorindex = (int) (Math.Max(Math.Min(1.0, map[x, y]/512.0), 0.0)*(pallete - 1));



                    // Handle error conditions

                    if (colorindex > pallete - 1 || colorindex < 0)

                        bmp.SetPixel(x, map.Height - y - 1, Color.Red);

                    else

                        bmp.SetPixel(x, map.Height - y - 1, colours[colorindex]);

                }

            }

            return bmp;

        }

    }

}