// The UMLet source code is distributed under the terms of the GPL; see license.txt
package com.umlet.control;

import java.awt.*;
import java.awt.font.*;
import java.awt.geom.*;
import java.awt.image.*;
import java.util.*;

import javax.swing.*;

public abstract class Constants
{
  public static int getPixelWidth(Graphics2D g2, String s) {
    TextLayout tl=new TextLayout(s, Constants.getFont(), Constants.getFRC(g2));
    return (int)tl.getBounds().getWidth();
  }

  public static FontRenderContext getFRC(Graphics2D g2) {
    FontRenderContext rendering;
    if (Constants.getFontsize()>12 & Umlet.IS_CLIPPING==false) {
         rendering=new FontRenderContext(null, true, true);
         g2.setRenderingHints(Constants.UxRenderingQualityHigh());
    } else {
         rendering=new FontRenderContext(null, false, false);
         g2.setRenderingHints(Constants.UxRenderingQualityLow());
    }
    return rendering;
  }


  public static void write(Graphics2D g2, String s, int x, int y, boolean center) {
    if (s==null) return;

    boolean underline=false;
    boolean italic=false;
    //LME: s must have a minimum length for applying text styles
    if (s.startsWith("_") && s.endsWith("_") && s.length()>2) {
      underline=true;
      s=s.substring(1,s.length()-1);
    }
    if (s.startsWith("/") && s.endsWith("/") && s.length()>2) {
      italic=true;
      g2.setFont(Constants.getFontItalic());
      s=s.substring(1,s.length()-1);
    }
    /*if (s.startsWith("_") && s.endsWith("_")) {
      underline=true;
      s=s.substring(1,s.length()-1);
    }*/

    // G.Mueller beginn

    /* <OLDCODE>
    if (s.startsWith("<<") && s.endsWith(">>") && s.length()>4) {
     s=s.substring(2,s.length()-2);
     s="\u00AB"+s+"\u00BB";
   } <OLDCODE>*/

    // I think this is better, ...

    s = s.replaceAll("<<", "\u00AB");
    s = s.replaceAll(">>", "\u00BB");

    // G.Mueller end

    if (center) {
      x=x-Constants.getPixelWidth(g2,s)/2;
    }
    g2.drawString(s,x,y);
    if (italic) g2.setFont(Constants.getFont());
    if (underline) {
      TextLayout l=new TextLayout(s, Constants.getFont(), getFRC(g2));
      Rectangle2D r2d=l.getBounds();
      g2.drawLine(x, y+Constants.getDistTextToLine()/2, x+(int)r2d.getWidth(), y+Constants.getDistTextToLine()/2);
    }
  }

   protected static ImageProducer convertToGIF(final JComponent comp, boolean transparent)
   {
      comp.setDoubleBuffered(false);
      JFrame frame = new JFrame();
      frame.setContentPane(comp);
      //frame.pack();

      // Get a graphics region, using the Frame
      Dimension size = new Dimension(comp.getWidth(), comp.getHeight());
      Image image = comp.createImage(size.width,size.height);
      final Graphics g = image.getGraphics();
      // Workaround for JDK 1.2.2 bug (Linux)
      g.setClip(0,0,size.width,size.height);

      comp.paint(g);
      try {
        Thread.sleep(1000);
      } catch (Exception e) { }

      /*try
      {
         // Paint the Swing component into the image, being careful to comply
         // with Swing's single thread requirements.

         SwingUtilities.invokeAndWait(new Runnable()
         {
            public void run()
            {
               comp.paint(g);
            }
         });
      }
      catch (Exception x) { x.printStackTrace(); }
      finally
      {
         g.dispose();
         frame.dispose();
      }*/

      ImageProducer prod = image.getSource();

      // Add a filter to make the background transparent

      /*if (transparent)
      {
         Color bg = comp.getBackground();
         ImageFilter f = new TransparentFilter(bg);
         prod = new FilteredImageSource(prod,f);
      }*/

      return prod;
   }


    public static final String DELIMITER_ENTITIES="~~~~~|||||~~~~~|||||";
    public static final String DELIMITER_STATE_AND_HIDDEN_STATE="/////<<<<</////<<<<<";
    public static final String DELIMITER_FIELDS="#####_____#####_____";

    public static final String DELIMITER_ADDITIONAL_ATTRIBUTES=";";


    public static BasicStroke getStroke(int strokeType, int lineThickness) {
        BasicStroke stroke=null;
        switch (strokeType) {
            case 0: stroke = new BasicStroke(lineThickness); break;
            case 1: float dash1[] = {8.0f, 5.0f};
                    stroke = new BasicStroke(lineThickness, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER, 5.0f, dash1, 0.0f);
                    break;
            case 2: float dash2[] = {1.0f, 2.0f};
            		stroke = new BasicStroke(lineThickness, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER, 5.0f, dash2, 0.0f);;
            case 3: break;
        }
        return stroke;
    }

    public static Point normalize(Point p, int pixels) {
      Point ret = new Point();
      double d=Math.sqrt(p.x*p.x+p.y*p.y);
      ret.x=(int)((double)p.x/d*(double)pixels);
      ret.y=(int)((double)p.y/d*(double)pixels);
      return ret;
    }
    public static Vector<String> decomposeStrings(String s, String delimiter) {
    	return decomposeStringsWFilter(s, delimiter, true);
    }

    public static Vector<String> decomposeStringsWithComments(String s, String delimiter) {
    	return decomposeStringsWFilter(s, delimiter, false);
    }

    private static Vector<String> decomposeStringsWFilter(String s, String delimiter, boolean filterComments) {
    	Vector<String> ret=new Vector<String>();
        for (;;) {
            int index = s.indexOf(delimiter);
            if (index<0) {
            	if(filterComments) {
            		s=filterComment(s);
            		if(s.startsWith("bg=")||s.startsWith("fg=")) s=""; //filter color-setting strings
            	}
                if (!s.equals("")) {
                	ret.add(s);
                }
                return ret;
            }
            String tmp=s.substring(0,index);
            if(filterComments) {
            	tmp=filterComment(tmp);
            	if(tmp.startsWith("bg=")||tmp.startsWith("fg=")) tmp=""; //filter color-setting strings
            }

            if (!tmp.equals("")) ret.add(tmp);
            s=s.substring(index+delimiter.length(), s.length());
        }
    }

    public static Vector<String> decomposeStrings(String s, String delimiter1, String delimiter2) {
        Vector<String> ret=new Vector<String>();
        for (;;) {
            int index1 = s.indexOf(delimiter1);
            int index2 = s.indexOf(delimiter2);
            String delimiter;
            int index;
            if((index1<=index2 || index2<0)&&index1>=0) {
            	index = index1;
            	delimiter = delimiter1;
            } else {
            	index = index2;
            	delimiter = delimiter2;
            }
            if (index<0) {
            	s=filterComment(s);
                if (!s.equals("")) ret.add(s);
                return ret;
            }
            String tmp=s.substring(0,index);
            tmp=filterComment(tmp);
            if (!tmp.equals("")) ret.add(tmp);
            s=s.substring(index+delimiter.length(), s.length());
        }
    }

    /**
     * Removes comments
     * @param s
     * @return
     */
    private static String filterComment(String s) {
    	int pos1 = s.indexOf("//");
		int pos2 = s.indexOf("///");
    	if(pos1>=0 && (pos2 != pos1)) {
    		if(pos1==0) return "";
    		else return s.substring(0,pos1);
    	}
    	return s;
    }


    public static Vector<String> decomposeStringsIncludingEmptyStrings(String s, String delimiter) {
        Vector<String> ret=new Vector<String>();
        for (;;) {
            int index = s.indexOf(delimiter);
            if (index<0) {
                ret.add(s);
                return ret;
            }
            String tmp=s.substring(0,index);
            ret.add(tmp);
            s=s.substring(index+delimiter.length(), s.length());
        }
    }
    public static String composeStrings(Vector v, String delimiter) {
        String ret=null;
        if (v!=null) {
            for (int i=0;i<v.size();i++) {
                if (ret==null) {
                    ret=new String((String)(v.elementAt(i)));
                } else {
                    ret=ret+delimiter+(String)(v.elementAt(i));
                }
            }
        }
        if (ret==null) ret="";
        return ret;
    }

    public static int INTERFACE_LINE_LENGTH = 40;
    private static int _fontsize=14;
    public static int getFontsize() { return _fontsize; }
    public static int getDistLineToText() {
      return (int)_fontsize/4;
    }
    public static int getDistTextToLine() {
      return (int)_fontsize/4;
    }
    public static int getDistTextToText() {
      return (int)_fontsize/4;
    }


    private static Font _font=new Font("SansSerif", Font.PLAIN, getFontsize());
    public static Font getFont() {
      return _font;
    }
    private static Font _fontItalic=new Font("SansSerif", Font.ITALIC, getFontsize());
    public static Font getFontItalic() {
      return _fontItalic;
    }

    static Map UxRenderingQualityHigh() {
        HashMap<RenderingHints.Key,Object> renderingHints= new HashMap<RenderingHints.Key,Object>();
        renderingHints.put(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        renderingHints.put(RenderingHints.KEY_ALPHA_INTERPOLATION, RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
        renderingHints.put(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
        renderingHints.put(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
        renderingHints.put(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR);
        renderingHints.put(RenderingHints.KEY_DITHERING, RenderingHints.VALUE_DITHER_ENABLE);
        renderingHints.put(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY);
        renderingHints.put(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
        return renderingHints;
    }
    static Map UxRenderingQualityLow() {
        HashMap renderingHints= new HashMap();
        //renderingHints.put(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_OFF);
        //renderingHints.put(RenderingHints.KEY_ALPHA_INTERPOLATION, RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
        //renderingHints.put(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
        //renderingHints.put(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
        //renderingHints.put(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR);
        //renderingHints.put(RenderingHints.KEY_DITHERING, RenderingHints.VALUE_DITHER_ENABLE);
        //renderingHints.put(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY);
        //renderingHints.put(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_OFF);
        return renderingHints;
    }


    static Color UxInverseColor(Color color) {
        int r=255-color.getRed();
        int g=255-color.getGreen();
        int b=255-color.getBlue();
        return new Color(r, g, b);
    }

    static Point calculateIntersection(Shape shape, Point p1, Point p2) {
        //if (!(!(shape.contains(p1.x, p1.y)) & shape.contains(p2.x, p2.y))) return null;
        Point inter=new Point(p1);
        Point inter2=new Point(p2);
        Point inter3=new Point();
        for (int i=0; i<1000; i++) {
            inter3.x=(inter.x+inter2.x)/2;
            inter3.y=(inter.y+inter2.y)/2;
            if (shape.contains(inter3.x, inter3.y)) {
                inter2.x=inter3.x;
                inter2.y=inter3.y;
            } else {
                inter.x=inter3.x;
                inter.y=inter3.y;
            }
            if (inter.distance(inter2)<=1) break;
        }
        return inter;
    }
    static Shape mergeShapes(Shape s1, Shape s2) {
        if (s1==null) return s2;
        GeneralPath path1=new GeneralPath(s1);
        path1.append(s2, false);
        return path1.createTransformedShape(AffineTransform.getTranslateInstance(0, 0));
    }
    static Shape translateShape(Shape s, double x, double y) {
        GeneralPath path=new GeneralPath(s);
        return path.createTransformedShape(AffineTransform.getTranslateInstance(x, y));
    }
    static double sign(double v) {
        if (v>=0) return 1d; else return -1d;
    }

    public static int RESIZE_TOP = 1;
    public static int RESIZE_RIGHT = 2;
    public static int RESIZE_BOTTOM = 4;
    public static int RESIZE_LEFT = 8;

    /**
     * Calculates the angle of the line defined by the koordinates
     * @param x1
     * @param y1
     * @param x2
     * @param y2
     * @return angle (radians)
     */
    public static double getAngle(double x1, double y1, double x2, double y2 ) {
      	double res;
        double x=x2-x1;
        double y=y2-y1;
        res = Math.atan(y/x);
        if(x>=0.0 && y>=0.0) res+=0.0;
        else if(x<0.0 && y>=0.0) res+=Math.PI;
        else if(x<0.0 && y<0.0) res+=Math.PI;
        else if(x>=0.0 && y<0.0) res+=2.0*Math.PI;
        return res;
    }
}
