/*
 * File    : MultiTrackerEditor.java
 * Created : 3 déc. 2003}
 * By      : Olivier
 *
 * Azureus - a Java Bittorrent client
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details ( see the LICENSE file ).
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package org.gudy.azureus2.ui.swt.maketorrent;

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.TreeEditor;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.*;
import org.gudy.azureus2.ui.swt.Messages;
import org.gudy.azureus2.ui.swt.Utils;
import org.gudy.azureus2.ui.swt.mainwindow.Colors;

import java.net.URL;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.HashMap;
import java.util.ArrayList;


/**
 * @author Olivier
 *
 */
public class WebSeedsEditor {   
  
  WebSeedsEditorListener listener;
  String oldName;
  String currentName;
  boolean	anonymous;
  
  Map webseeds;
  
  Display display;
  Shell shell;    
  Text textName;
  Tree treeGroups;
  TreeEditor editor;
  TreeItem itemEdited;
  Button btnSave;
  Button btnCancel;
  
  Menu menu;
  
  public WebSeedsEditor(String name,Map webseeds,WebSeedsEditorListener listener) {
  	this( name, webseeds, listener, false );
  }
  
  public 
  WebSeedsEditor(
  		String 					name,
		Map 					webseeds,
		WebSeedsEditorListener 	listener,
		boolean					_anonymous ) 
  {
  		this.oldName = name;
    if(name != null)
      this.currentName = name;
    else
      this.currentName = "";
    this.listener = listener;
    anonymous = _anonymous;
    this.webseeds = new HashMap(webseeds);
    createWindow();
    
  }
  
  private void createWindow() {
    this.display = Display.getCurrent();
    this.shell = org.gudy.azureus2.ui.swt.components.shell.ShellFactory.createShell(SWT.DIALOG_TRIM | SWT.APPLICATION_MODAL);
    Messages.setLanguageText(this.shell,"wizard.webseedseditor.edit.title");
    Utils.setShellIcon(shell);
    GridLayout layout = new GridLayout();
    layout.numColumns = 3;
    shell.setLayout(layout);
    
    GridData gridData;
    
    if ( !anonymous ){
    	
	    Label labelName = new Label(shell,SWT.NULL);
	    Messages.setLanguageText(labelName,"wizard.multitracker.edit.name");
	    
	    textName = new Text(shell,SWT.BORDER);
	    textName.setText(currentName);
	    gridData = new GridData(GridData.FILL_HORIZONTAL);
	    gridData.horizontalSpan = 2;
	    textName.setLayoutData(gridData);
	    textName.addModifyListener(new ModifyListener() {
		    public void modifyText(ModifyEvent arg0) {
		      currentName = textName.getText();
		      computeSaveEnable();
		    }
	    });   
    }
        
    treeGroups = new Tree(shell,SWT.BORDER);
    gridData = new GridData(GridData.FILL_BOTH);
    gridData.horizontalSpan = 3;
    gridData.heightHint = 150;
    treeGroups.setLayoutData(gridData);
    
    treeGroups.addMouseListener(
    		new MouseAdapter() 
    		{
    			public void 
    			mouseDoubleClick(
    				MouseEvent arg0 )
    			{
    				if(treeGroups.getSelectionCount() == 1) {
    					TreeItem treeItem = treeGroups.getSelection()[0];
    					String type = (String) treeItem.getData("type");
    					if(type.equals("tracker")) {
    						editTreeItem(treeItem);
    					}
    				}
    			}
    		});
    		
    Label labelSeparator = new Label(shell,SWT.SEPARATOR | SWT.HORIZONTAL);
    gridData = new GridData(GridData.FILL_HORIZONTAL);
    gridData.horizontalSpan = 3;
    labelSeparator.setLayoutData(gridData);
    
    	// button row 
    
    Label label = new Label(shell,SWT.NULL);
    gridData = new GridData(GridData.FILL_HORIZONTAL );
    label.setLayoutData(gridData);
    
    Composite cButtons = new Composite(shell, SWT.NULL);
    gridData = new GridData(GridData.FILL_HORIZONTAL);
    gridData.horizontalSpan = 3;
    cButtons.setLayoutData(gridData);
    GridLayout layoutButtons = new GridLayout();
    layoutButtons.numColumns = 3;
    cButtons.setLayout(layoutButtons);
    label = new Label(cButtons,SWT.NULL);
    gridData = new GridData(GridData.FILL_HORIZONTAL );
    label.setLayoutData(gridData);
    
    btnSave = new Button(cButtons,SWT.PUSH);
    gridData = new GridData();
    gridData.widthHint = 70;
    gridData.horizontalAlignment = GridData.END;
    btnSave.setLayoutData(gridData);
    Messages.setLanguageText(btnSave,"wizard.multitracker.edit.save");
    btnSave.addListener(SWT.Selection, new Listener() {
      public void handleEvent(Event e) {
        update();
        shell.dispose();
      }
    });
    
    btnCancel = new Button(cButtons,SWT.PUSH);
    gridData = new GridData();
    gridData.horizontalAlignment = GridData.END;
    gridData.widthHint = 70;
    btnCancel.setLayoutData(gridData);
    Messages.setLanguageText(btnCancel,"Button.cancel");
    btnCancel.addListener(SWT.Selection, new Listener() {
      public void handleEvent(Event e) {
        shell.dispose();
      }
    });
    
    shell.setDefaultButton( btnSave );
    
    shell.addListener(SWT.Traverse, new Listener() {	
    	public void handleEvent(Event e) {
    		if ( e.character == SWT.ESC){
    			shell.dispose();
    		}
    	}
    });

    
    computeSaveEnable();
    refresh();
    constructMenu();
    
    editor = new TreeEditor (treeGroups);
    treeGroups.addSelectionListener(new SelectionAdapter() {
	    public void widgetSelected(SelectionEvent arg0) {	      
	      if(itemEdited != null && !editor.getEditor().isDisposed())
	        itemEdited.setText(((Text)editor.getEditor()).getText());
	      removeEditor();
	    }
    });
    
    shell.pack();

    Point size = shell.computeSize(400,SWT.DEFAULT);
    shell.setSize(size);
        
    Utils.centreWindow( shell );
    
    shell.open();
  }  
  
  private void update() {
    webseeds = new HashMap();
    TreeItem[] groupItems = treeGroups.getItems();
    
    for(int i = 0 ; i < groupItems.length ; i++) {
      TreeItem group = groupItems[i];      
      TreeItem[] trackerItems = group.getItems();
      List groupList = new ArrayList(group.getItemCount());
      for(int j = 0 ; j < trackerItems.length ; j++) {
        groupList.add(trackerItems[j].getText());
      }
      webseeds.put(group.getText(),groupList);
    }
    
    listener.webSeedsChanged(oldName,currentName,webseeds);
    oldName = currentName;
  }

  private void computeSaveEnable() 
  {
  	boolean	enabled = anonymous || !("".equals(currentName));
  	
  	if ( enabled ){
  		
 	  	TreeItem[] groupItems = treeGroups.getItems();
		 
 	  	outer:
	  	for(int i = 0 ; i < groupItems.length ; i++) {
	  		TreeItem group = groupItems[i];      
	  		TreeItem[] trackerItems = group.getItems();
	  		for(int j = 0 ; j < trackerItems.length ; j++) {
		  			
	  			if ( ! validURL(trackerItems[j].getText())){
	  				
	  				enabled = false;
	  				
	  				break outer;
		  		}
		  	}
	  	}
  	}
  	
  	if ( enabled != btnSave.getEnabled()){
  		
  		btnSave.setEnabled( enabled );
  	}
  }
  
  private void refresh() {
    treeGroups.removeAll();    
    Iterator iter = webseeds.entrySet().iterator();
    while(iter.hasNext()) {
      Map.Entry entry = (Map.Entry) iter.next();
      TreeItem itemRoot = newGroup((String)entry.getKey());
      Iterator iter2 = ((List)entry.getValue()).iterator();
      while(iter2.hasNext()) {
        String url =  (String) iter2.next();
        newTracker(itemRoot,url);
      }      
    }      
  }
  
  private void constructMenu() {
    menu = new Menu(shell,SWT.NULL);
    menu.addListener(SWT.Show, new Listener() {
      public void handleEvent(Event e) {
        //1. Empty the menu
        MenuItem[] items = menu.getItems();
        for(int i = 0 ; i < items.length ; i++) {
          items[i].dispose();
        }
       
        
        //3. Grab the element
        final TreeItem treeItem = treeGroups.getSelection()[0];
        String type = (String) treeItem.getData("type");
        if(type.equals("tracker")) {
          //The Tracker menu
          MenuItem item = new MenuItem(menu,SWT.NULL);
          Messages.setLanguageText(item,"wizard.multitracker.edit.deletetracker");
          item.addListener(SWT.Selection,new Listener(){
            public void handleEvent(Event arg0) {
              treeItem.dispose();
            }
          });
          
          item = new MenuItem(menu,SWT.NULL);
          Messages.setLanguageText(item,"wizard.multitracker.edit.edit");
          item.addListener(SWT.Selection,new Listener(){
	          public void handleEvent(Event arg0) {
	            editTreeItem(treeItem);
	          }
          });
        } else
        if(type.equals("group")) {
          //The Group menu
           
          MenuItem item = new MenuItem(menu,SWT.NULL);
          Messages.setLanguageText(item,"wizard.webseedseditor.edit.newseed");
          item.addListener(SWT.Selection, new Listener() {
            public void handleEvent(Event arg0) {
              TreeItem itemTracker = newTracker(treeItem,"http://");
              editTreeItem(itemTracker);
            }
          });
        }
      }
    });
    treeGroups.setMenu(menu);
  }
  
  private void editTreeItem(final TreeItem item) {
    // Clean up any previous editor control
    Control oldEditor = editor.getEditor();
    if (oldEditor != null)
      oldEditor.dispose();	
 
    itemEdited = item;
    // The control that will be the editor must be a child of the Tree
    final Text text = new Text(treeGroups, SWT.BORDER);
    text.setText(item.getText());
    text.setForeground(item.getForeground());
    text.setSelection(item.getText().length());
    text.addListener (SWT.DefaultSelection, new Listener () {
      public void handleEvent (Event e) {
      	String url = text.getText();
      	if ( validURL(url)){
      		text.setForeground( null );
      		item.setForeground( null );
      	}else{
      		text.setForeground( Colors.colorError );
      		item.setForeground( Colors.colorError );
      	}
      	item.setText(url);
        computeSaveEnable();
        removeEditor();
      }
    });
    
    text.addListener(SWT.Modify, new Listener() {
    	public void handleEvent (Event e) {
    		String url = text.getText();
    		if ( validURL(url)){
    			text.setForeground( null );
    			item.setForeground( null );
    		}else{
    			text.setForeground( Colors.colorError );
    			item.setForeground( Colors.colorError );
    		}
    		item.setText(url);
     		computeSaveEnable();
    	}
    });
    
    text.addKeyListener(new KeyAdapter() {
	    public void keyReleased(KeyEvent keyEvent) {
	     if(keyEvent.character == SWT.ESC) {	       
	       removeEditor();
	     }
	    }
    });
    

    //The text editor must have the same size as the cell and must
    //not be any smaller than 50 pixels.
    editor.horizontalAlignment = SWT.LEFT;
    editor.grabHorizontal = true;
    editor.minimumWidth = 50;

    Rectangle r = text.computeTrim(0, 0, 100, text.getLineHeight());
    editor.minimumHeight = r.height;


    // Open the text editor on the selected row.
    editor.setEditor (text, item);

    // Assign focus to the text control
    text.setFocus ();
  }
  
  private boolean
  validURL(
  	String	str )
  {
  	try{
  		URL url = new URL(str);
  		
  		String prot = url.getProtocol().toLowerCase();
  		  		
  		if ( prot.startsWith( "http" )){
  			
  			return( true );
  		}
  		
  		return( false );
  		
  	}catch( Throwable e ){
  		
  		return( false );
  	}
  }
  
  private void removeEditor() {
    Control oldEditor = editor.getEditor();
    if (oldEditor != null)
      oldEditor.dispose();
  }
  
  private TreeItem newGroup(String name) {
    TreeItem item = new TreeItem(treeGroups,SWT.NULL);
    item.setData("type","group");
    item.setText(name);
    return item;
  }
  
  private TreeItem newTracker(TreeItem root,String url) {
    TreeItem item = new TreeItem(root,SWT.NULL);
    item.setText(url);
    item.setData("type","tracker");
    root.setExpanded(true);
    return item;
  }
}
