package com.quantum.ui.dialog;

import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;

import com.quantum.Messages;
import com.quantum.model.Bookmark;
import com.quantum.model.BookmarkCollection;

import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.List;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;

/**
 * @author BC
 */
public class BookmarkSelectionDialog extends Dialog {
    
    private List list;
    private String selection = null;
    private PropertyChangeSupport propertyChangeSupport = new PropertyChangeSupport(this);

    /**
     * @param parentShell
     */
    public BookmarkSelectionDialog(Shell parentShell) {
        super(parentShell);
        int style = getShellStyle() | SWT.TITLE;
        setShellStyle(style);
    }
    
    protected void configureShell(Shell shell) {
        super.configureShell(shell);
        shell.setText(Messages.getString("BookmarkSelectionDialog.title"));
    }
        
    /**
     * @see org.eclipse.jface.dialogs.Dialog#createDialogArea(org.eclipse.swt.widgets.Composite)
     */
    protected Control createDialogArea(Composite parent) {

        Composite composite = new Composite(parent, 0);
        GridLayout layout = new GridLayout();
        composite.setLayout(layout);
        layout.numColumns = 1;
        layout.verticalSpacing = 1;

        Label label = new Label(composite, SWT.NULL);
        label.setText(Messages.getString("BookmarkSelectionDialog.text"));
        
        this.list = new List(composite, SWT.SINGLE | SWT.BORDER | SWT.V_SCROLL);
        Bookmark[] bookmarks = BookmarkCollection.getInstance().getBookmarks();
        
        for (int i = 0, length = (bookmarks == null) ? 0 : bookmarks.length; i < length; i++) {
            this.list.add(bookmarks[i].getName());
            if (i == 0) {
                this.list.select(i);
                setSelection(bookmarks[i].getName());
            }
        }

        final List list = this.list;
        list.addListener(SWT.Selection, new Listener() {
                public void handleEvent (Event event) {
                    String[] selections = list.getSelection();
                    if (selections != null && selections.length > 0) {
                        BookmarkSelectionDialog.this.setSelection(selections[0]);
                    }
                }        
            });

        GridData full = new GridData();
        full.horizontalAlignment = GridData.FILL;
        full.verticalAlignment = GridData.FILL;
        full.heightHint = convertHeightInCharsToPixels(3);
        this.list.setLayoutData(full);

        return composite;
    }
    
    /**
     * @param listener
     */
    public synchronized void addPropertyChangeListener(PropertyChangeListener listener) {
        this.propertyChangeSupport.addPropertyChangeListener(listener);
    }

    /**
     * @param listener
     */
    public synchronized void removePropertyChangeListener(PropertyChangeListener listener) {
        this.propertyChangeSupport.removePropertyChangeListener(listener);
    }
    
    private void setSelection(String selection) {
        String original = this.selection;
        if (this.selection == null || !this.selection.equals(selection)) {
            this.selection = selection;
            this.propertyChangeSupport.firePropertyChange("selection", original, this.selection);
        }
    }
}