/*
 * Copyright (c) 2006 Rick Mugridge, www.RimuResearch.com
 * Released under the terms of the GNU General Public License version 2 or later.
*/
package fitlibrary.parser.graphic;
 
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Random;
 
import fitlibrary.differences.LocalFile;
import fitlibrary.log.Logging;
import fitlibrary.traverse.Traverse;
 
/**
 * Used to check that the Dot file associated with the GIF matches the expected
 * Dot file contents.
 * It assumes that Dot is installed, as it runs it to produce a GIF for an actual
 * value that doesn't match.
 * This general approach can be used with any image-making scheme.
 */
public class DotGraphic implements GraphicInterface {
    private static final Random random = new Random(System.currentTimeMillis());
    protected String dot;
     
    public DotGraphic(String dot) {
        this.dot = dot;
    }
    public static DotGraphic parseGraphic(LocalFile file) {
     return new DotGraphic(getDot(file));
    }
    public boolean equals(Object other) {
        if (!(other instanceof DotGraphic))
            return false;
        boolean equals = dot.equals(((DotGraphic)other).dot);
        Logging.log(this,"equals(): '"+dot+"' and '"+other+"' equals="+equals);
        return equals;
    }
    public LocalFile toGraphic() {
        try {
            LocalFile actualImageFile = actualImageFile(dot);
            Logging.log(this,"toGraphic(): '"+actualImageFile+"'" );
            return actualImageFile;
        } catch (IOException ex) {
            throw new RuntimeException("Problem with Dot: "+ex);
        }
    }
    public String toString() {
        String htmlImageLink = toGraphic().htmlImageLink();
        Logging.log(this,"toString(): '"+htmlImageLink+"'" );
        return htmlImageLink;
    }
 private LocalFile actualImageFile(String actualDot) throws IOException {
     final String actuals = "tempActuals";
     String actualName = actuals+"/actual"+random.nextInt(999999);
        Traverse.getLocalFile(actuals).mkdir();
     File dotFile = Traverse.getLocalFile(actualName+".dot" ).getFile();
     FileWriter writer = new FileWriter(dotFile);
     writer.write(actualDot);
     writer.close();
     LocalFile imageFileName = Traverse.getLocalFile(actualName+".gif" );
  File imageFile = imageFileName.getFile();
     // Run dot on the file to produce GIF
        Process process = Runtime.getRuntime().exec("dot -Tgif \""+dotFile.getAbsolutePath()+"\" -o \""+
          imageFile.getAbsolutePath()+"\"" );
        try {
            process.waitFor();
        } catch (InterruptedException e1) {
            throw new RuntimeException("Dot process timed out." );
        }
        if (process.exitValue() != 0)
            throw new RuntimeException("Problems with actual Dot:\n"+actualDot);
     return imageFileName;
 }
 private static String getDot(LocalFile file) {
        return getFileContents(file.withSuffix("dot" ).getFile());
 }
    private static String getFileContents(File file) {
     FileReader reader;
     try {
         reader = new FileReader(file);
         char[] chars = new char[(int)file.length()];
         reader.read(chars);
         return new String(chars);
     } catch (IOException ex) {
         throw new RuntimeException("Problem reading "+
                 file.getAbsolutePath()+": "+ex);
     }
    }
}