// Copyright (C) 2011 Chan Wai Shing
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package prettify.example;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import prettify.PrettifyParser;
import prettify.theme.ThemeDefault;
import syntaxhighlight.Parser;
import syntaxhighlight.SyntaxHighlighter;

/**
 * Usage example. This will just cover some of the functions. To know other 
 * available functions, please read the JavaDoc.
 * 
 * @author Chan Wai Shing <cws1989@gmail.com>
 */
public class Example {

  private static final Logger LOG = Logger.getLogger(Example.class.getName());

  /**
   * Read the resource file from the jar.
   * @param path the resource path
   * @return the content of the resource file in byte array
   * @throws IOException error occurred when reading the content from the file
   */
  public static byte[] readResourceFile(String path) throws IOException {
    if (path == null) {
      throw new NullPointerException("argument 'path' cannot be null");
    }

    ByteArrayOutputStream bout = new ByteArrayOutputStream();
    InputStream in = null;
    try {
      in = Example.class.getResourceAsStream(path);
      if (in == null) {
        throw new IOException("Resources not found: " + path);
      }

      int byteRead = 0;
      byte[] b = new byte[8096];

      while ((byteRead = in.read(b)) != -1) {
        bout.write(b, 0, byteRead);
      }
    } finally {
      if (in != null) {
        try {
          in.close();
        } catch (IOException ex) {
        }
      }
    }

    return bout.toByteArray();
  }

  public static void main(String[] args) {
    // set look & feel
    try {
      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
    } catch (Exception ex) {
      LOG.log(Level.INFO, "Failed to set system look and feel.", ex);
    }

    SwingUtilities.invokeLater(new Runnable() {

      @Override
      public void run() {
        // timer start
        long start, end;
        start = System.currentTimeMillis();

        // the Prettify parser
        Parser parser = new PrettifyParser();

        // initialize the highlighter and use Default theme
        SyntaxHighlighter highlighter = new SyntaxHighlighter(parser, new ThemeDefault());
        // set the line number count from 10 instead of 1
        highlighter.setFirstLine(10);
        // set to highlight line 13, 27, 28, 38, 42, 43 and 53
        highlighter.setHighlightedLineList(Arrays.asList(13, 27, 28, 38, 42, 43, 53));

        String resourcePath = "/prettify/example/example.html";
        if (args.length > 0 && args[0].equals("txt")) {
          resourcePath = "/prettify/example/text.txt";
          highlighter.setFirstLine(0);
          highlighter.setHighlightedLineList(new ArrayList<>());
        }

        try {
          // set the content of the script, the example.html is located in the jar: /prettify/example/example.html
          highlighter.setContent(new String(readResourceFile(resourcePath)), resourcePath);
        } catch (IOException ex) {
          LOG.log(Level.SEVERE, null, ex);
        }

        // timer end
        end = System.currentTimeMillis();
        System.out.println("time elapsed: " + (end - start) + "ms");

        // initiate a frame and display
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        // SyntaxHighlighter is actually a JScrollPane
        frame.setContentPane(highlighter);
        frame.setLocationByPlatform(true);
        frame.pack();
        frame.setVisible(true);
      }
    });
  }
}