/*
 * Copyright (c) Contributors, 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 OpenSimulator 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 System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Globalization;
using System.IO;
using System.Net;
using Nini.Config;
using OpenMetaverse;
using OpenMetaverse.Imaging;
using OpenSim.Region.Framework.Interfaces;
using OpenSim.Region.Framework.Scenes;
using log4net;
using System.Reflection;

//using Cairo;

namespace OpenSim.Region.CoreModules.Scripting.VectorRender
{
    public class VectorRenderModule : IRegionModule, IDynamicTextureRender
    {
        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        private string m_name = "VectorRenderModule";
        private Scene m_scene;
        private IDynamicTextureManager m_textureManager;
        private Graphics m_graph;
        private string m_fontName = "Arial";

        public VectorRenderModule()
        {
        }

        #region IDynamicTextureRender Members

        public string GetContentType()
        {
            return ("vector");
        }

        public string GetName()
        {
            return m_name;
        }

        public bool SupportsAsynchronous()
        {
            return true;
        }

        public byte[] ConvertUrl(string url, string extraParams)
        {
            return null;
        }

        public byte[] ConvertStream(Stream data, string extraParams)
        {
            return null;
        }

        public bool AsyncConvertUrl(UUID id, string url, string extraParams)
        {
            return false;
        }

        public bool AsyncConvertData(UUID id, string bodyData, string extraParams)
        {
            Draw(bodyData, id, extraParams);
            return true;
        }

        public void GetDrawStringSize(string text, string fontName, int fontSize, 
                                      out double xSize, out double ySize)
        {
            Font myFont = new Font(fontName, fontSize);
            SizeF stringSize = new SizeF();
            lock (m_graph) {
                stringSize = m_graph.MeasureString(text, myFont);
                xSize = stringSize.Width;
                ySize = stringSize.Height;
            }
        }


        #endregion

        #region IRegionModule Members

        public void Initialise(Scene scene, IConfigSource config)
        {
            if (m_scene == null)
            {
                m_scene = scene;
            }

            if (m_graph == null)
            {
                Bitmap bitmap = new Bitmap(1024, 1024, PixelFormat.Format32bppArgb);
                m_graph = Graphics.FromImage(bitmap);
            }

            IConfig cfg = config.Configs["VectorRender"];
            if (null != cfg)
            {
                m_fontName = cfg.GetString("font_name", m_fontName);
            }
            m_log.DebugFormat("[VECTORRENDERMODULE]: using font \"{0}\" for text rendering.", m_fontName);
        }

        public void PostInitialise()
        {
            m_textureManager = m_scene.RequestModuleInterface<IDynamicTextureManager>();
            if (m_textureManager != null)
            {
                m_textureManager.RegisterRender(GetContentType(), this);
            }
        }

        public void Close()
        {
        }

        public string Name
        {
            get { return m_name; }
        }

        public bool IsSharedModule
        {
            get { return true; }
        }

        #endregion

        private void Draw(string data, UUID id, string extraParams)
        {
            // We need to cater for old scripts that didnt use extraParams neatly, they use either an integer size which represents both width and height, or setalpha
            // we will now support multiple comma seperated params in the form  width:256,height:512,alpha:255
            int width = 256;
            int height = 256;
            int alpha = 255; // 0 is transparent
            Color bgColour = Color.White;  // Default background color
            char altDataDelim = ';';
            
            char[] paramDelimiter = { ',' };
            char[] nvpDelimiter = { ':' };
           
            extraParams = extraParams.Trim();
            extraParams = extraParams.ToLower();
            
            string[] nvps = extraParams.Split(paramDelimiter);
            
            int temp = -1;
            foreach (string pair in nvps)
            {
                string[] nvp = pair.Split(nvpDelimiter);
                string name = "";
                string value = "";
                
                if (nvp[0] != null)
                {
                    name = nvp[0].Trim();
                }
                
                if (nvp.Length == 2)
                {
                    value = nvp[1].Trim();
                }
                
                switch (name)
                {
                    case "width":
                        temp = parseIntParam(value);
                        if (temp != -1)
                        {
                            if (temp < 1)
                            {
                                width = 1;
                            }
                            else if (temp > 2048)
                            {
                                width = 2048;
                            }
                            else
                            {
                                width = temp;
                            }
                        }
                        break;
                    case "height":
                        temp = parseIntParam(value);
                        if (temp != -1)
                        {
                            if (temp < 1)
                            {
                                height = 1;
                            }
                            else if (temp > 2048)
                            {
                                height = 2048;
                            }
                            else
                            {
                                height = temp;
                            }
                        }
                        break;
                     case "alpha":
                          temp = parseIntParam(value);
                          if (temp != -1)
                          {
                              if (temp < 0)
                              {
                                  alpha = 0;
                              }
                              else if (temp > 255)
                              {
                                  alpha = 255;
                              }
                              else
                              {
                                  alpha = temp;
                              }
                          }
                          // Allow a bitmap w/o the alpha component to be created
                          else if (value.ToLower() == "false") {
                               alpha = 256;
                          }
                          break;
                     case "bgcolour":
                         int hex = 0;
                         if (Int32.TryParse(value, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out hex))
                         {
                             bgColour = Color.FromArgb(hex);
                         } 
                         else
                         {
                             bgColour = Color.FromName(value);
                         }
                         break;
                     case "altdatadelim":
                         altDataDelim = value.ToCharArray()[0];
                         break;
                     case "":
                         // blank string has been passed do nothing just use defaults
                     break;
                     default: // this is all for backwards compat, all a bit ugly hopfully can be removed in future
                         // could be either set alpha or just an int
                         if (name == "setalpha")
                         {
                             alpha = 0; // set the texture to have transparent background (maintains backwards compat)
                         }
                         else
                         {
                             // this function used to accept an int on its own that represented both 
                             // width and height, this is to maintain backwards compat, could be removed
                             // but would break existing scripts
                             temp = parseIntParam(name);
                             if (temp != -1)
                             {
                                 if (temp > 1024)
                                    temp = 1024;
                                    
                                 if (temp < 128)
                                     temp = 128;
                                  
                                 width = temp;
                                 height = temp;
                             }
                         }
                     break;
                }
            }

            Bitmap bitmap;
            
            if (alpha == 256)
            {
                bitmap = new Bitmap(width, height, PixelFormat.Format32bppRgb);
            }
            else
            {
                bitmap = new Bitmap(width, height, PixelFormat.Format32bppArgb);
            }

            Graphics graph = Graphics.FromImage(bitmap);

            // this is really just to save people filling the 
            // background color in their scripts, only do when fully opaque
            if (alpha >= 255)
            {
                graph.FillRectangle(new SolidBrush(bgColour), 0, 0, width, height); 
            }

            for (int w = 0; w < bitmap.Width; w++)
            {
                if (alpha <= 255) 
                {
                    for (int h = 0; h < bitmap.Height; h++)
                    {
                        bitmap.SetPixel(w, h, Color.FromArgb(alpha, bitmap.GetPixel(w, h)));
                    }
                }
            }

            GDIDraw(data, graph, altDataDelim);

            byte[] imageJ2000 = new byte[0];

            try
            {
                imageJ2000 = OpenJPEG.EncodeFromImage(bitmap, true);
            }
            catch (Exception)
            {
                m_log.Error(
                    "[VECTORRENDERMODULE]: OpenJpeg Encode Failed.  Empty byte data returned!");
            }

            m_textureManager.ReturnData(id, imageJ2000);
        }
        
        private int parseIntParam(string strInt)
        {
            int parsed;
            try
            {
                parsed = Convert.ToInt32(strInt);
            }
            catch (Exception)
            {
                //Ckrinke: Add a WriteLine to remove the warning about 'e' defined but not used
                // m_log.Debug("Problem with Draw. Please verify parameters." + e.ToString());
                parsed = -1;
            }
            
            return parsed;
        }

/*
        private void CairoDraw(string data, System.Drawing.Graphics graph)
        {
            using (Win32Surface draw = new Win32Surface(graph.GetHdc()))
            {
                Context contex = new Context(draw);

                contex.Antialias = Antialias.None;    //fastest method but low quality
                contex.LineWidth = 7;
                char[] lineDelimiter = { ';' };
                char[] partsDelimiter = { ',' };
                string[] lines = data.Split(lineDelimiter);

                foreach (string line in lines)
                {
                    string nextLine = line.Trim();

                    if (nextLine.StartsWith("MoveTO"))
                    {
                        float x = 0;
                        float y = 0;
                        GetParams(partsDelimiter, ref nextLine, ref x, ref y);
                        contex.MoveTo(x, y);
                    }
                    else if (nextLine.StartsWith("LineTo"))
                    {
                        float x = 0;
                        float y = 0;
                        GetParams(partsDelimiter, ref nextLine, ref x, ref y);
                        contex.LineTo(x, y);
                        contex.Stroke();
                    }
                }
            }
            graph.ReleaseHdc();
        }
*/

        private void GDIDraw(string data, Graphics graph, char dataDelim)
        {
            Point startPoint = new Point(0, 0);
            Point endPoint = new Point(0, 0);
            Pen drawPen = new Pen(Color.Black, 7);
            string fontName = m_fontName;
            float fontSize = 14;
            Font myFont = new Font(fontName, fontSize);
            SolidBrush myBrush = new SolidBrush(Color.Black);
            
            char[] lineDelimiter = {dataDelim};
            char[] partsDelimiter = {','};
            string[] lines = data.Split(lineDelimiter);

            foreach (string line in lines)
            {
                string nextLine = line.Trim();
                //replace with switch, or even better, do some proper parsing
                if (nextLine.StartsWith("MoveTo"))
                {
                    float x = 0;
                    float y = 0;
                    GetParams(partsDelimiter, ref nextLine, 6, ref x, ref y);
                    startPoint.X = (int) x;
                    startPoint.Y = (int) y;
                }
                else if (nextLine.StartsWith("LineTo"))
                {
                    float x = 0;
                    float y = 0;
                    GetParams(partsDelimiter, ref nextLine, 6, ref x, ref y);
                    endPoint.X = (int) x;
                    endPoint.Y = (int) y;
                    graph.DrawLine(drawPen, startPoint, endPoint);
                    startPoint.X = endPoint.X;
                    startPoint.Y = endPoint.Y;
                }
                else if (nextLine.StartsWith("Text"))
                {
                    nextLine = nextLine.Remove(0, 4);
                    nextLine = nextLine.Trim();
                    graph.DrawString(nextLine, myFont, myBrush, startPoint);
                }
                else if (nextLine.StartsWith("Image"))
                {
                    float x = 0;
                    float y = 0;
                    GetParams(partsDelimiter, ref nextLine, 5, ref x, ref y);
                    endPoint.X = (int) x;
                    endPoint.Y = (int) y;
                    Image image = ImageHttpRequest(nextLine);
                    if (image != null)
                    {
                        graph.DrawImage(image, (float)startPoint.X, (float)startPoint.Y, x, y);
                    }
                    else
                    {
                        graph.DrawString("URL couldn't be resolved or is", new Font(m_fontName,6), 
                                         myBrush, startPoint);
                        graph.DrawString("not an image. Please check URL.", new Font(m_fontName, 6), 
                                         myBrush, new Point(startPoint.X, 12 + startPoint.Y));
                        graph.DrawRectangle(drawPen, startPoint.X, startPoint.Y, endPoint.X, endPoint.Y);
                    }
                    startPoint.X += endPoint.X;
                    startPoint.Y += endPoint.Y;
                }
                else if (nextLine.StartsWith("Rectangle"))
                {
                    float x = 0;
                    float y = 0;
                    GetParams(partsDelimiter, ref nextLine, 9, ref x, ref y);
                    endPoint.X = (int) x;
                    endPoint.Y = (int) y;
                    graph.DrawRectangle(drawPen, startPoint.X, startPoint.Y, endPoint.X, endPoint.Y);
                    startPoint.X += endPoint.X;
                    startPoint.Y += endPoint.Y;
                }
                else if (nextLine.StartsWith("FillRectangle"))
                {
                    float x = 0;
                    float y = 0;
                    GetParams(partsDelimiter, ref nextLine, 13, ref x, ref y);
                    endPoint.X = (int) x;
                    endPoint.Y = (int) y;
                    graph.FillRectangle(myBrush, startPoint.X, startPoint.Y, endPoint.X, endPoint.Y);
                    startPoint.X += endPoint.X;
                    startPoint.Y += endPoint.Y;
                }
                else if (nextLine.StartsWith("FillPolygon"))
                {
                    PointF[] points = null;
                    GetParams(partsDelimiter, ref nextLine, 11, ref points);
                    graph.FillPolygon(myBrush, points);
                }
                else if (nextLine.StartsWith("Polygon"))
                {
                    PointF[] points = null;
                    GetParams(partsDelimiter, ref nextLine, 7, ref points);
                    graph.DrawPolygon(drawPen, points);
                }
                else if (nextLine.StartsWith("Ellipse"))
                {
                    float x = 0;
                    float y = 0;
                    GetParams(partsDelimiter, ref nextLine, 7, ref x, ref y);
                    endPoint.X = (int)x;
                    endPoint.Y = (int)y;
                    graph.DrawEllipse(drawPen, startPoint.X, startPoint.Y, endPoint.X, endPoint.Y);
                    startPoint.X += endPoint.X;
                    startPoint.Y += endPoint.Y;
                }
                else if (nextLine.StartsWith("FontSize"))
                {
                    nextLine = nextLine.Remove(0, 8);
                    nextLine = nextLine.Trim();
                    fontSize = Convert.ToSingle(nextLine, CultureInfo.InvariantCulture);
                    myFont = new Font(fontName, fontSize);
                }
                else if (nextLine.StartsWith("FontProp"))
                {
                    nextLine = nextLine.Remove(0, 8);
                    nextLine = nextLine.Trim();

                    string[] fprops = nextLine.Split(partsDelimiter);
                    foreach (string prop in fprops)
                    {

                        switch (prop)
                        {
                            case "B":
                                if (!(myFont.Bold))
                                    myFont = new Font(myFont, myFont.Style | FontStyle.Bold);
                                break;
                            case "I":
                                if (!(myFont.Italic))
                                    myFont = new Font(myFont, myFont.Style | FontStyle.Italic);
                                break;
                            case "U":
                                if (!(myFont.Underline))
                                    myFont = new Font(myFont, myFont.Style | FontStyle.Underline);
                                break;
                            case "S":
                                if (!(myFont.Strikeout))
                                    myFont = new Font(myFont, myFont.Style | FontStyle.Strikeout);
                                break;
                            case "R":
                                myFont = new Font(myFont, FontStyle.Regular);
                                break;
                        }
                    }
                }
                else if (nextLine.StartsWith("FontName"))
                {
                    nextLine = nextLine.Remove(0, 8);
                    fontName = nextLine.Trim();
                    myFont = new Font(fontName, fontSize);
                }
                else if (nextLine.StartsWith("PenSize"))
                {
                    nextLine = nextLine.Remove(0, 7);
                    nextLine = nextLine.Trim();
                    float size = Convert.ToSingle(nextLine, CultureInfo.InvariantCulture);
                    drawPen.Width = size;
                }
                else if (nextLine.StartsWith("PenCap"))
                {
                    bool start = true, end = true;
                    nextLine = nextLine.Remove(0, 6);
                    nextLine = nextLine.Trim();
                    string[] cap = nextLine.Split(partsDelimiter);
                    if (cap[0].ToLower() == "start")
                        end = false;
                    else if (cap[0].ToLower() == "end")
                        start = false;
                    else if (cap[0].ToLower() != "both")
                        return;
                    string type = cap[1].ToLower();
                    
                    if (end)
                    {
                        switch (type)
                        {
                            case "arrow":
                                drawPen.EndCap = System.Drawing.Drawing2D.LineCap.ArrowAnchor;
                                break;
                            case "round":
                                drawPen.EndCap = System.Drawing.Drawing2D.LineCap.RoundAnchor;
                                break;
                            case "diamond":
                                drawPen.EndCap = System.Drawing.Drawing2D.LineCap.DiamondAnchor;
                                break;
                            case "flat":
                                drawPen.EndCap = System.Drawing.Drawing2D.LineCap.Flat;
                                break;
                        }
                    }
                    if (start)
                    {
                        switch (type)
                        {
                            case "arrow":
                                drawPen.StartCap = System.Drawing.Drawing2D.LineCap.ArrowAnchor;
                                break;
                            case "round":
                                drawPen.StartCap = System.Drawing.Drawing2D.LineCap.RoundAnchor;
                                break;
                            case "diamond":
                                drawPen.StartCap = System.Drawing.Drawing2D.LineCap.DiamondAnchor;
                                break;
                            case "flat":
                                drawPen.StartCap = System.Drawing.Drawing2D.LineCap.Flat;
                                break;
                        }
                    }
                }
                else if (nextLine.StartsWith("PenColour"))
                {
                    nextLine = nextLine.Remove(0, 9);
                    nextLine = nextLine.Trim();
                    int hex = 0;

                    Color newColour;
                    if (Int32.TryParse(nextLine, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out hex))
                    {
                        newColour = Color.FromArgb(hex);
                    }
                    else
                    {
                        // this doesn't fail, it just returns black if nothing is found
                        newColour = Color.FromName(nextLine);
                    }

                    myBrush.Color = newColour;
                    drawPen.Color = newColour;
                }
            }
        }

        private static void GetParams(char[] partsDelimiter, ref string line, int startLength, ref float x, ref float y)
        {
            line = line.Remove(0, startLength);
            string[] parts = line.Split(partsDelimiter);
            if (parts.Length == 2)
            {
                string xVal = parts[0].Trim();
                string yVal = parts[1].Trim();
                x = Convert.ToSingle(xVal, CultureInfo.InvariantCulture);
                y = Convert.ToSingle(yVal, CultureInfo.InvariantCulture);
            }
            else if (parts.Length > 2)
            {
                string xVal = parts[0].Trim();
                string yVal = parts[1].Trim();
                x = Convert.ToSingle(xVal, CultureInfo.InvariantCulture);
                y = Convert.ToSingle(yVal, CultureInfo.InvariantCulture);

                line = "";
                for (int i = 2; i < parts.Length; i++)
                {
                    line = line + parts[i].Trim();
                    line = line + " ";
                }
            }
        }

        private static void GetParams(char[] partsDelimiter, ref string line, int startLength, ref PointF[] points)
        {
            line = line.Remove(0, startLength);
            string[] parts = line.Split(partsDelimiter);
            if (parts.Length > 1 && parts.Length % 2 == 0)
            {
                points = new PointF[parts.Length / 2];
                for (int i = 0; i < parts.Length; i = i + 2)
                {
                    string xVal = parts[i].Trim();
                    string yVal = parts[i+1].Trim();
                    float x = Convert.ToSingle(xVal, CultureInfo.InvariantCulture);
                    float y = Convert.ToSingle(yVal, CultureInfo.InvariantCulture);
                    PointF point = new PointF(x, y);
                    points[i / 2] = point;
                }
            }
        }

        private Bitmap ImageHttpRequest(string url)
        {
            try
            {
            WebRequest request = HttpWebRequest.Create(url);
//Ckrinke: Comment out for now as 'str' is unused. Bring it back into play later when it is used.
//Ckrinke            Stream str = null;
                HttpWebResponse response = (HttpWebResponse)(request).GetResponse();
                if (response.StatusCode == HttpStatusCode.OK)
                {
                    Bitmap image = new Bitmap(response.GetResponseStream());
                    return image;
                }
            }
            catch { }
            return null;
        }
    }
}
