/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package net.sourceforge.phpeclipse.views.browser;
import java.text.MessageFormat;
import java.util.MissingResourceException;
import java.util.ResourceBundle;
import org.eclipse.swt.SWT;
import org.eclipse.swt.SWTError;
import org.eclipse.swt.browser.Browser;
import org.eclipse.swt.browser.CloseWindowListener;
import org.eclipse.swt.browser.LocationEvent;
import org.eclipse.swt.browser.LocationListener;
import org.eclipse.swt.browser.OpenWindowListener;
import org.eclipse.swt.browser.ProgressEvent;
import org.eclipse.swt.browser.ProgressListener;
import org.eclipse.swt.browser.StatusTextEvent;
import org.eclipse.swt.browser.StatusTextListener;
import org.eclipse.swt.browser.TitleEvent;
import org.eclipse.swt.browser.TitleListener;
import org.eclipse.swt.browser.VisibilityWindowListener;
import org.eclipse.swt.browser.WindowEvent;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.FormAttachment;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.layout.FormLayout;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.ProgressBar;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
import org.eclipse.swt.widgets.ToolBar;
import org.eclipse.swt.widgets.ToolItem;

public class PHPBrowser {
  static ResourceBundle resourceBundle = ResourceBundle
      .getBundle("net.sourceforge.phpeclipse.views.browser.browser");
  int index;
  boolean busy;
  Image images[];
  Text location;
  Browser browser;
  static final String[] imageLocations = {"eclipse01.bmp", "eclipse02.bmp",
      "eclipse03.bmp", "eclipse04.bmp", "eclipse05.bmp", "eclipse06.bmp",
      "eclipse07.bmp", "eclipse08.bmp", "eclipse09.bmp", "eclipse10.bmp",
      "eclipse11.bmp", "eclipse12.bmp",};
  static final String iconLocation = "document.gif";
  /**
   * Creates an instance of a ControlExample embedded inside the supplied
   * parent Composite.
   * 
   * @param parent
   *            the container of the example
   */
  public PHPBrowser(Composite parent) {
    initResources();
    final Display display = parent.getDisplay();
    FormLayout layout = new FormLayout();
    parent.setLayout(layout);
    ToolBar toolbar = new ToolBar(parent, SWT.NONE);
    final ToolItem itemBack = new ToolItem(toolbar, SWT.PUSH);
    itemBack.setText(getResourceString("Back"));
    final ToolItem itemForward = new ToolItem(toolbar, SWT.PUSH);
    itemForward.setText(getResourceString("Forward"));
    final ToolItem itemStop = new ToolItem(toolbar, SWT.PUSH);
    itemStop.setText(getResourceString("Stop"));
    final ToolItem itemRefresh = new ToolItem(toolbar, SWT.PUSH);
    itemRefresh.setText(getResourceString("Refresh"));
    final ToolItem itemGo = new ToolItem(toolbar, SWT.PUSH);
    itemGo.setText(getResourceString("Go"));
    location = new Text(parent, SWT.BORDER);
    final Canvas canvas = new Canvas(parent, SWT.NO_BACKGROUND);
    final Rectangle rect = images[0].getBounds();
    canvas.addListener(SWT.Paint, new Listener() {
      public void handleEvent(Event e) {
        Point pt = canvas.getSize();
        e.gc.drawImage(images[index], 0, 0, rect.width, rect.height, 0, 0,
            pt.x, pt.y);
      }
    });
    canvas.addListener(SWT.MouseDown, new Listener() {
      public void handleEvent(Event e) {
        browser.setUrl(getResourceString("Startup"));
      }
    });
    display.asyncExec(new Runnable() {
      public void run() {
        if (canvas.isDisposed())
          return;
        if (busy) {
          index++;
          if (index == images.length)
            index = 0;
          canvas.redraw();
        }
        display.timerExec(150, this);
      }
    });
    final Label status = new Label(parent, SWT.NONE);
    final ProgressBar progressBar = new ProgressBar(parent, SWT.NONE);
    FormData data = new FormData();
    data.top = new FormAttachment(0, 5);
    toolbar.setLayoutData(data);
    data = new FormData();
    data.left = new FormAttachment(0, 0);
    data.right = new FormAttachment(100, 0);
    data.top = new FormAttachment(canvas, 5, SWT.DEFAULT);
    data.bottom = new FormAttachment(status, -5, SWT.DEFAULT);
    try {
      browser = new Browser(parent, SWT.NONE);
      browser.setLayoutData(data);
    } catch (SWTError e) {
      /* Browser widget could not be instantiated */
      Label label = new Label(parent, SWT.CENTER | SWT.WRAP);
      label.setText(getResourceString("BrowserNotCreated"));
      label.setLayoutData(data);
    }
    data = new FormData();
    data.width = 24;
    data.height = 24;
    data.top = new FormAttachment(0, 5);
    data.right = new FormAttachment(100, -5);
    canvas.setLayoutData(data);
    data = new FormData();
    data.top = new FormAttachment(toolbar, 0, SWT.TOP);
    data.left = new FormAttachment(toolbar, 5, SWT.RIGHT);
    data.right = new FormAttachment(canvas, -5, SWT.DEFAULT);
    location.setLayoutData(data);
    data = new FormData();
    data.left = new FormAttachment(0, 5);
    data.right = new FormAttachment(progressBar, 0, SWT.DEFAULT);
    data.bottom = new FormAttachment(100, -5);
    status.setLayoutData(data);
    data = new FormData();
    data.right = new FormAttachment(100, -5);
    data.bottom = new FormAttachment(100, -5);
    progressBar.setLayoutData(data);
    if (browser != null) {
      itemBack.setEnabled(browser.isBackEnabled());
      itemForward.setEnabled(browser.isForwardEnabled());
      Listener listener = new Listener() {
        public void handleEvent(Event event) {
          ToolItem item = (ToolItem) event.widget;
          if (item == itemBack)
            browser.back();
          else if (item == itemForward)
            browser.forward();
          else if (item == itemStop)
            browser.stop();
          else if (item == itemRefresh)
            browser.refresh();
          else if (item == itemGo)
            browser.setUrl(location.getText());
        }
      };
      browser.addLocationListener(new LocationListener() {
        public void changed(LocationEvent event) {
          busy = true;
          if (event.top)
            location.setText(event.location);
        }
        public void changing(LocationEvent event) {
        }
      });
      browser.addProgressListener(new ProgressListener() {
        public void changed(ProgressEvent event) {
          if (event.total == 0)
            return;
          int ratio = event.current * 100 / event.total;
          progressBar.setSelection(ratio);
          busy = event.current != event.total;
          if (!busy) {
            index = 0;
            canvas.redraw();
          }
        }
        public void completed(ProgressEvent event) {
          itemBack.setEnabled(browser.isBackEnabled());
          itemForward.setEnabled(browser.isForwardEnabled());
          progressBar.setSelection(0);
          busy = false;
          index = 0;
          canvas.redraw();
        }
      });
      browser.addStatusTextListener(new StatusTextListener() {
        public void changed(StatusTextEvent event) {
          status.setText(event.text);
        }
      });
      if (parent instanceof Shell) {
        final Shell shell = (Shell) parent;
        browser.addTitleListener(new TitleListener() {
          public void changed(TitleEvent event) {
            shell.setText(event.title + " - "
                + getResourceString("window.title"));
          }
        });
      }
      itemBack.addListener(SWT.Selection, listener);
      itemForward.addListener(SWT.Selection, listener);
      itemStop.addListener(SWT.Selection, listener);
      itemRefresh.addListener(SWT.Selection, listener);
      itemGo.addListener(SWT.Selection, listener);
      location.addListener(SWT.DefaultSelection, new Listener() {
        public void handleEvent(Event e) {
          browser.setUrl(location.getText());
        }
      });
      initialize(display, browser);
      browser.setUrl(getResourceString("Startup"));
    }
  }
  /**
   * Gets a string from the resource bundle. We don't want to crash because of
   * a missing String. Returns the key if not found.
   */
  static String getResourceString(String key) {
    try {
      return resourceBundle.getString(key);
    } catch (MissingResourceException e) {
      return key;
    } catch (NullPointerException e) {
      return "!" + key + "!";
    }
  }
  /**
   * Gets a string from the resource bundle and binds it with the given
   * arguments. If the key is not found, return the key.
   */
  static String getResourceString(String key, Object[] args) {
    try {
      return MessageFormat.format(getResourceString(key), args);
    } catch (MissingResourceException e) {
      return key;
    } catch (NullPointerException e) {
      return "!" + key + "!";
    }
  }
  static void initialize(final Display display, Browser browser) {
    browser.addOpenWindowListener(new OpenWindowListener() {
      public void open(WindowEvent event) {
        Shell shell = new Shell(display);
        shell.setLayout(new FillLayout());
        Browser browser = new Browser(shell, SWT.NONE);
        initialize(display, browser);
        event.browser = browser;
      }
    });
    browser.addVisibilityWindowListener(new VisibilityWindowListener() {
      public void hide(WindowEvent event) {
      }
      public void show(WindowEvent event) {
        Browser browser = (Browser) event.widget;
        Shell shell = browser.getShell();
        if (event.location != null)
          shell.setLocation(event.location);
        if (event.size != null) {
          Point size = event.size;
          shell.setSize(shell.computeSize(size.x, size.y));
        }
        shell.open();
      }
    });
    browser.addCloseWindowListener(new CloseWindowListener() {
      public void close(WindowEvent event) {
        Browser browser = (Browser) event.widget;
        Shell shell = browser.getShell();
        shell.close();
      }
    });
  }
  /**
   * Disposes of all resources associated with a particular instance of the
   * BrowserExample.
   */
  public void dispose() {
    freeResources();
  }
  /**
   * Frees the resources
   */
  void freeResources() {
    if (images != null) {
      for (int i = 0; i < images.length; ++i) {
        final Image image = images[i];
        if (image != null)
          image.dispose();
      }
      images = null;
    }
  }
  /**
   * Grabs input focus.
   */
  public void setFocus() {
    location.setFocus();
  }
  /**
   * Loads the resources
   */
  void initResources() {
    final Class clazz = this.getClass();
    if (resourceBundle != null) {
      try {
        if (images == null) {
          images = new Image[imageLocations.length];
          for (int i = 0; i < imageLocations.length; ++i) {
            ImageData source = new ImageData(clazz
                .getResourceAsStream(imageLocations[i]));
            ImageData mask = source.getTransparencyMask();
            images[i] = new Image(null, source, mask);
          }
        }
        return;
      } catch (Throwable t) {
      }
    }
    String error = (resourceBundle != null)
        ? getResourceString("error.CouldNotLoadResources")
        : "Unable to load resources";
    freeResources();
    throw new RuntimeException(error);
  }
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
    shell.setText(getResourceString("window.title"));
    PHPBrowser instance = new PHPBrowser(shell);
    Image icon = new Image(display, PHPBrowser.class
        .getResourceAsStream(iconLocation));
    shell.setImage(icon);
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    icon.dispose();
    instance.dispose();
    display.dispose();
  }
}