/*
 * SVG Salamander
 * Copyright (c) 2004, Mark McKay
 * All rights reserved.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "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
 * COPYRIGHT HOLDER OR 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. 
 * 
 * Mark McKay can be contacted at mark@kitfox.com.  Salamander and other
 * projects can be found at http://www.kitfox.com
 *
 * Created on January 26, 2004, 1:56 AM
 */

package com.kitfox.svg;

import com.kitfox.svg.xml.StyleAttribute;
import java.awt.*;
import java.awt.font.*;
import java.awt.geom.*;
import java.util.*;
import java.util.regex.*;

//import org.apache.batik.ext.awt.geom.ExtendedGeneralPath;

/**
 * @author Mark McKay
 * @author <a href="mailto:mark@kitfox.com">Mark McKay</a>
 */
public class Text extends ShapeElement
{
    
    float x = 0;
    float y = 0;
    AffineTransform transform = null;
    
    String fontFamily;
    float fontSize;
    
    //List of strings and tspans containing the content of this node
    LinkedList content = new LinkedList();
    
    Shape textShape;
    
    public static final int TXAN_START = 0;
    public static final int TXAN_MIDDLE = 1;
    public static final int TXAN_END = 2;
    int textAnchor = TXAN_START;
    
    public static final int TXST_NORMAL = 0;
    public static final int TXST_ITALIC = 1;
    public static final int TXST_OBLIQUE = 2;
    int fontStyle;
    
    public static final int TXWE_NORMAL = 0;
    public static final int TXWE_BOLD = 1;
    public static final int TXWE_BOLDER = 2;
    public static final int TXWE_LIGHTER = 3;
    public static final int TXWE_100 = 4;
    public static final int TXWE_200 = 5;
    public static final int TXWE_300 = 6;
    public static final int TXWE_400 = 7;
    public static final int TXWE_500 = 8;
    public static final int TXWE_600 = 9;
    public static final int TXWE_700 = 10;
    public static final int TXWE_800 = 11;
    public static final int TXWE_900 = 12;
    int fontWeight;
    
    /** Creates a new instance of Stop */
    public Text()
    {
    }
    
    public void appendText(String text)
    {
        content.addLast(text);
    }
    
    public void appendTspan(Tspan tspan) throws SVGElementException
    {
        super.loaderAddChild(null, tspan);
        content.addLast(tspan);
//        tspan.setParent(this);
    }
    
    /**
     * Discard cached information
     */
    public void rebuild() throws SVGException
    {
        build();
    }
    
    public java.util.List getContent()
    {
        return content;
    }
/*
    public void loaderStartElement(SVGLoaderHelper helper, Attributes attrs, SVGElement parent)
    {
                //Load style string
        super.loaderStartElement(helper, attrs, parent);
 
        String x = attrs.getValue("x");
        String y = attrs.getValue("y");
        //String transform = attrs.getValue("transform");
 
        this.x = XMLParseUtil.parseFloat(x);
        this.y = XMLParseUtil.parseFloat(y);
    }
 */
    /**
     * Called after the start element but before the end element to indicate
     * each child tag that has been processed
     */
    public void loaderAddChild(SVGLoaderHelper helper, SVGElement child) throws SVGElementException
    {
        super.loaderAddChild(helper, child);
        
        content.addLast(child);
    }
    
    /**
     * Called during load process to add text scanned within a tag
     */
    public void loaderAddText(SVGLoaderHelper helper, String text)
    {
        Matcher matchWs = Pattern.compile("\\s*").matcher(text);
        if (!matchWs.matches()) content.addLast(text);
    }
    
    public void build() throws SVGException
    {
        super.build();
        
        StyleAttribute sty = new StyleAttribute();
        
        if (getPres(sty.setName("x"))) x = sty.getFloatValueWithUnits();
        
        if (getPres(sty.setName("y"))) y = sty.getFloatValueWithUnits();
        
        if (getStyle(sty.setName("font-family"))) fontFamily = sty.getStringValue();
        else fontFamily = "Sans Serif";
        
        if (getStyle(sty.setName("font-size"))) fontSize = sty.getFloatValueWithUnits();
        else fontSize = 12f;
        
        if (getStyle(sty.setName("font-style")))
        {
            String s = sty.getStringValue();
            if ("normal".equals(s))
            {
                fontStyle = TXST_NORMAL;
            }
            else if ("italic".equals(s))
            {
                fontStyle = TXST_ITALIC;
            }
            else if ("oblique".equals(s))
            {
                fontStyle = TXST_OBLIQUE;
            }
        }
        else fontStyle = TXST_NORMAL;
        
        if (getStyle(sty.setName("font-weight")))
        {
            String s = sty.getStringValue();
            if ("normal".equals(s))
            {
                fontWeight = TXWE_NORMAL;
            }
            else if ("bold".equals(s))
            {
                fontWeight = TXWE_BOLD;
            }
        }
        else fontWeight = TXWE_BOLD;
        
        if (getStyle(sty.setName("text-anchor")))
        {
            String s = sty.getStringValue();
            if (s.equals("middle")) textAnchor = TXAN_MIDDLE;
            else if (s.equals("end")) textAnchor = TXAN_END;
            else textAnchor = TXAN_START;
        }
        else textAnchor = TXAN_START;
        
        //text anchor
        //text-decoration
        //text-rendering
        
        buildFont();
    }
    
    protected void buildFont() throws SVGException
    {
        int style;
        switch (fontStyle)
        {
            case TXST_ITALIC:
                style = java.awt.Font.ITALIC;
                break;
            default:
                style = java.awt.Font.PLAIN;
                break;
        }

        int weight;
        switch (fontWeight)
        {
            case TXWE_BOLD:
            case TXWE_BOLDER:
                weight = java.awt.Font.BOLD;
                break;
            default:
                weight = java.awt.Font.PLAIN;
                break;
        }
            
        //Get font
        Font font = diagram.getUniverse().getFont(fontFamily);
        if (font == null)
        {
//            System.err.println("Could not load font");
            
            java.awt.Font sysFont = new java.awt.Font(fontFamily, style | weight, (int)fontSize);
            buildSysFont(sysFont);
            return;
        }
        
//        font = new java.awt.Font(font.getFamily(), style | weight, font.getSize());
        
//        Area textArea = new Area();
        GeneralPath textPath = new GeneralPath();
        textShape = textPath;
        
        float cursorX = x, cursorY = y;
        
        FontFace fontFace = font.getFontFace();
        //int unitsPerEm = fontFace.getUnitsPerEm();
        int ascent = fontFace.getAscent();
        float fontScale = fontSize / (float)ascent;
        
//        AffineTransform oldXform = g.getTransform();
        AffineTransform xform = new AffineTransform();
        
        for (Iterator it = content.iterator(); it.hasNext();)
        {
            Object obj = it.next();
            
            if (obj instanceof String)
            {
                String text = (String)obj;
                if (text != null)
                {
                    text = text.trim();
                }
                
                strokeWidthScalar = 1f / fontScale;
                
                for (int i = 0; i < text.length(); i++)
                {
                    xform.setToIdentity();
                    xform.setToTranslation(cursorX, cursorY);
                    xform.scale(fontScale, fontScale);
//                    g.transform(xform);
                    
                    String unicode = text.substring(i, i + 1);
                    MissingGlyph glyph = font.getGlyph(unicode);
                    
                    Shape path = glyph.getPath();
                    if (path != null)
                    {
                        path = xform.createTransformedShape(path);
                        textPath.append(path, false);
                    }
//                    else glyph.render(g);
                    
                    cursorX += fontScale * glyph.getHorizAdvX();
                    
//                    g.setTransform(oldXform);
                }
                
                strokeWidthScalar = 1f;
            }
            else if (obj instanceof Tspan)
            {
                Tspan tspan = (Tspan)obj;
                
                xform.setToIdentity();
                xform.setToTranslation(cursorX, cursorY);
                xform.scale(fontScale, fontScale);
//                tspan.setCursorX(cursorX);
//                tspan.setCursorY(cursorY);
                
                Shape tspanShape = tspan.getShape();
                tspanShape = xform.createTransformedShape(tspanShape);
                textPath.append(tspanShape, false);
//                tspan.render(g);
//                cursorX = tspan.getCursorX();
//                cursorY = tspan.getCursorY();
            }
            
        }
        
        switch (textAnchor)
        {
            case TXAN_MIDDLE:
            {
                AffineTransform at = new AffineTransform();
                at.translate(-textPath.getBounds2D().getWidth() / 2, 0);
                textPath.transform(at);
                break;
            }
            case TXAN_END:
            {
                AffineTransform at = new AffineTransform();
                at.translate(-textPath.getBounds2D().getWidth(), 0);
                textPath.transform(at);
                break;
            }
        }
    }
    
    private void buildSysFont(java.awt.Font font) throws SVGException
    {
        GeneralPath textPath = new GeneralPath();
        textShape = textPath;
        
        float cursorX = x, cursorY = y;
        
//        FontMetrics fm = g.getFontMetrics(font);
        FontRenderContext frc = new FontRenderContext(null, true, true);
        
//        FontFace fontFace = font.getFontFace();
        //int unitsPerEm = fontFace.getUnitsPerEm();
//        int ascent = fm.getAscent();
//        float fontScale = fontSize / (float)ascent;
        
//        AffineTransform oldXform = g.getTransform();
        AffineTransform xform = new AffineTransform();
        
        for (Iterator it = content.iterator(); it.hasNext();)
        {
            Object obj = it.next();
            
            if (obj instanceof String)
            {
                String text = (String)obj;
                
                Shape textShape = font.createGlyphVector(frc, text).getOutline(cursorX, cursorY);
                textPath.append(textShape, false);
//                renderShape(g, textShape);
//                g.drawString(text, cursorX, cursorY);
                
                Rectangle2D rect = font.getStringBounds(text, frc);
                cursorX += (float)rect.getWidth();
            }
            else if (obj instanceof Tspan)
            {
                /*
                Tspan tspan = (Tspan)obj;
                 
                xform.setToIdentity();
                xform.setToTranslation(cursorX, cursorY);
                 
                Shape tspanShape = tspan.getShape();
                tspanShape = xform.createTransformedShape(tspanShape);
                textArea.add(new Area(tspanShape));
                 
                cursorX += tspanShape.getBounds2D().getWidth();
                 */
                
                
                Tspan tspan = (Tspan)obj;
                tspan.setCursorX(cursorX);
                tspan.setCursorY(cursorY);
                tspan.addShape(textPath);
                cursorX = tspan.getCursorX();
                cursorY = tspan.getCursorY();
                
            }
        }
        
        switch (textAnchor)
        {
            case TXAN_MIDDLE:
            {
                AffineTransform at = new AffineTransform();
                at.translate(-textPath.getBounds2D().getWidth() / 2, 0);
                textPath.transform(at);
                break;
            }
            case TXAN_END:
            {
                AffineTransform at = new AffineTransform();
                at.translate(-textPath.getBounds2D().getWidth(), 0);
                textPath.transform(at);
                break;
            }
        }
    }
    
    
    public void render(Graphics2D g) throws SVGException
    {
        beginLayer(g);
        renderShape(g, textShape);
        finishLayer(g);
    }
    
    public Shape getShape()
    {
        return shapeToParent(textShape);
    }
    
    public Rectangle2D getBoundingBox() throws SVGException
    {
        return boundsToParent(includeStrokeInBounds(textShape.getBounds2D()));
    }
    
    /**
     * Updates all attributes in this diagram associated with a time event.
     * Ie, all attributes with track information.
     * @return - true if this node has changed state as a result of the time
     * update
     */
    public boolean updateTime(double curTime) throws SVGException
    {
//        if (trackManager.getNumTracks() == 0) return false;
        boolean changeState = super.updateTime(curTime);
        
        //Get current values for parameters
        StyleAttribute sty = new StyleAttribute();
        boolean shapeChange = false;
        
        if (getPres(sty.setName("x")))
        {
            float newVal = sty.getFloatValueWithUnits();
            if (newVal != x)
            {
                x = newVal;
                shapeChange = true;
            }
        }
        
        if (getPres(sty.setName("y")))
        {
            float newVal = sty.getFloatValueWithUnits();
            if (newVal != y)
            {
                y = newVal;
                shapeChange = true;
            }
        }
        
        if (getPres(sty.setName("font-family")))
        {
            String newVal = sty.getStringValue();
            if (!newVal.equals(fontFamily))
            {
                fontFamily = newVal;
                shapeChange = true;
            }
        }
        
        if (getPres(sty.setName("font-size")))
        {
            float newVal = sty.getFloatValueWithUnits();
            if (newVal != fontSize)
            {
                fontSize = newVal;
                shapeChange = true;
            }
        }
        
        
        if (getStyle(sty.setName("font-style")))
        {
            String s = sty.getStringValue();
            int newVal = fontStyle;
            if ("normal".equals(s))
            {
                newVal = TXST_NORMAL;
            }
            else if ("italic".equals(s))
            {
                newVal = TXST_ITALIC;
            }
            else if ("oblique".equals(s))
            {
                newVal = TXST_OBLIQUE;
            }
            if (newVal != fontStyle)
            {
                fontStyle = newVal;
                shapeChange = true;
            }
        }
        
        if (getStyle(sty.setName("font-weight")))
        {
            String s = sty.getStringValue();
            int newVal = fontWeight;
            if ("normal".equals(s))
            {
                newVal = TXWE_NORMAL;
            }
            else if ("bold".equals(s))
            {
                newVal = TXWE_BOLD;
            }
            if (newVal != fontWeight)
            {
                fontWeight = newVal;
                shapeChange = true;
            }
        }
        
        if (shapeChange)
        {
            build();
//            buildFont();
//            return true;
        }
        
        return changeState || shapeChange;
    }
}