/**********************************************************************
 * Copyright (c) 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 - Initial API and implementation
 **********************************************************************/
package net.sourceforge.phpeclipse.webbrowser.internal;

import java.util.Iterator;

import net.sourceforge.phpeclipse.webbrowser.IExternalWebBrowser;
import net.sourceforge.phpeclipse.webbrowser.IExternalWebBrowserWorkingCopy;
import net.sourceforge.phpeclipse.webbrowser.IInternalWebBrowser;
import net.sourceforge.phpeclipse.webbrowser.IInternalWebBrowserWorkingCopy;
import net.sourceforge.phpeclipse.webbrowser.IWebBrowser;

import org.eclipse.jface.viewers.*;
import org.eclipse.jface.window.Window;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.*;
import org.eclipse.ui.help.WorkbenchHelp;
import org.eclipse.jface.viewers.CheckStateChangedEvent;
import org.eclipse.jface.viewers.CheckboxTableViewer;
import org.eclipse.jface.viewers.ICheckStateListener;
/**
 * 
 */
public class BrowserTableComposite extends Composite {
	protected Table table;
	protected CheckboxTableViewer tableViewer;
	protected Button edit;
	protected Button remove;
	protected Button search;
	protected IWebBrowser selection;
	
	protected Label location;
	protected Label parameters;
	
	public BrowserTableComposite(Composite parent, int style) {
		super(parent, style);
		createWidgets();
	}

	protected void createWidgets() {
		GridLayout layout = new GridLayout();
		layout.horizontalSpacing = 5;
		layout.verticalSpacing = 5;
		layout.marginWidth = 0;
		layout.marginHeight = 0;
		layout.numColumns = 2;
		setLayout(layout);

		GridData data = new GridData(GridData.FILL_BOTH);
		setLayoutData(data);
		
		Label label = new Label(this, SWT.NONE);
		label.setText(WebBrowserUIPlugin.getResource("%browserList"));
		data = new GridData(GridData.FILL_HORIZONTAL | GridData.VERTICAL_ALIGN_CENTER);
		data.horizontalSpan = 2;
		label.setLayoutData(data);
		
		table = new Table(this, SWT.CHECK | SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL | SWT.SINGLE | SWT.FULL_SELECTION);
		data = new GridData(GridData.FILL_HORIZONTAL | GridData.VERTICAL_ALIGN_FILL);
		data.widthHint = 300;
		table.setLayoutData(data);
		table.setHeaderVisible(false);
		table.setLinesVisible(false);
		
		TableLayout tableLayout = new TableLayout();
		new TableColumn(table, SWT.NONE);
		
		tableLayout.addColumnData(new ColumnWeightData(100));

		table.setLayout(tableLayout);
		
		tableViewer = new CheckboxTableViewer(table);
		
		tableViewer.setContentProvider(new BrowserContentProvider());
		tableViewer.setLabelProvider(new BrowserTableLabelProvider());
	
		tableViewer.setInput("root");

		// uncheck any other elements that might be checked and leave only the element checked to
		// remain checked since one can only chose one brower at a time to be current.
		tableViewer.addCheckStateListener(new ICheckStateListener() {
			public void checkStateChanged(CheckStateChangedEvent e) {
				checkNewDefaultBrowser(e.getElement());
				IWebBrowser browser = (IWebBrowser) e.getElement();
				BrowserManager.getInstance().setCurrentWebBrowser(browser);
				
				// if no other browsers are checked, don't allow the single one currently
				// checked to become unchecked, and lose a current browser. That is, don't
				// permit unchecking if no other item is checked which is supposed to be the case.
				Object[] obj = tableViewer.getCheckedElements();
			   if (obj.length == 0)
			    	tableViewer.setChecked(e.getElement(), true);
			}
		});
		
		// set a default, checked browser based on the current browser. If there is not a
		// current browser, but the first item exists, use that instead.
		// This will work currently until workbench shutdown, because current browser is not yet persisted.
		IWebBrowser browser = BrowserManager.getInstance().getCurrentWebBrowser();
		if (browser != null)
			tableViewer.setChecked(browser, true);
		else {
			Object obj = tableViewer.getElementAt(0);
			if (obj != null)
				tableViewer.setChecked(obj, true);
		}
		
		tableViewer.addSelectionChangedListener(new ISelectionChangedListener() {
			public void selectionChanged(SelectionChangedEvent event) {
				Object obj = getSelection(event.getSelection());
				
				if (obj instanceof IInternalWebBrowser) {
					selection = (IInternalWebBrowser) obj;
					remove.setEnabled(false);
					edit.setEnabled(true);
				} else if (obj instanceof IExternalWebBrowser) {
					selection = (IExternalWebBrowser) obj;
					remove.setEnabled(true);
					edit.setEnabled(true);
				} else
					selection = null;
				
				if (selection == null) {
					edit.setEnabled(false);
					remove.setEnabled(false);
				}
			}
		});
		
		Composite buttonComp = new Composite(this, SWT.NONE);
		layout = new GridLayout();
		layout.horizontalSpacing = 0;
		layout.verticalSpacing = 5;
		layout.marginWidth = 0;
		layout.marginHeight = 0;
		layout.numColumns = 1;
		buttonComp.setLayout(layout);
		data = new GridData(GridData.HORIZONTAL_ALIGN_END | GridData.VERTICAL_ALIGN_FILL);
		buttonComp.setLayoutData(data);
		
		Button add = SWTUtil.createButton(buttonComp, WebBrowserUIPlugin.getResource("%add"));
		add.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				ExternalBrowserDialog dialog = new ExternalBrowserDialog(getShell());
				if (dialog.open() == Window.CANCEL)
					return;
				tableViewer.refresh();
			}
		});
		
		edit = SWTUtil.createButton(buttonComp, WebBrowserUIPlugin.getResource("%edit"));
		edit.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				IWebBrowser browser2 = getSelectedWebBrowser();

				if (browser2 instanceof IInternalWebBrowser) {
					IInternalWebBrowserWorkingCopy wc = ((IInternalWebBrowser) browser2).getWorkingCopy();
					InternalBrowserDialog dialog = new InternalBrowserDialog(getShell(), wc);
					if (dialog.open() != Window.CANCEL) {
						try {
							tableViewer.refresh(wc.save());
						} catch (Exception ex) { }
					}
				}				
				else if(browser2 instanceof IExternalWebBrowser) {
					IExternalWebBrowserWorkingCopy wc = ((IExternalWebBrowser) browser2).getWorkingCopy();
					ExternalBrowserDialog dialog = new ExternalBrowserDialog(getShell(), wc);
					if (dialog.open() != Window.CANCEL) {
						try {
							tableViewer.refresh(wc.save());
						} catch (Exception ex) { }
					}
				}
		   }     		
		});
		edit.setEnabled(false);

		remove = SWTUtil.createButton(buttonComp, WebBrowserUIPlugin.getResource("%remove"));
		remove.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				IWebBrowser browser2 = getSelectedWebBrowser();
				try {
					if (browser2 instanceof IInternalWebBrowser){
						remove.setEnabled(false);
						return; // nothing else possible to do
                    } 
					else if(browser2 instanceof IExternalWebBrowser) {
						remove.setEnabled(true);
                       ((IExternalWebBrowser) browser2).delete();
                       
						tableViewer.remove(browser2);
						
						// need here to ensure that if the item deleted was checked, ie, was
						// the current browser, that the new current browser will be the first in the
						// list, typically, the internal browser, which cannot be deleted, and be current.
						if(((IExternalWebBrowser) browser2) == BrowserManager.getInstance().getCurrentWebBrowser()){
							Object obj = tableViewer.getElementAt(0);
								if(obj != null){
									BrowserManager.getInstance().setCurrentWebBrowser((InternalWebBrowser)obj);
									tableViewer.setChecked(obj, true);
								}
						}
					}
				} catch (Exception ex) { }
			}
		});
		remove.setEnabled(false);
		
		search = SWTUtil.createButton(buttonComp, WebBrowserUIPlugin.getResource("%search"));
		search.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				java.util.List browsersToCreate = BrowserSearcher.search(getShell());
				
				if (browsersToCreate == null) // cancelled
					return;
				
				if (browsersToCreate.isEmpty()) { // no browsers found
					WebBrowserUtil.openMessage(WebBrowserUIPlugin.getResource("%searchingNoneFound"));
					return;
				}
				
				Iterator iterator = browsersToCreate.iterator();
				while (iterator.hasNext()) {
					IExternalWebBrowserWorkingCopy browser2 = (IExternalWebBrowserWorkingCopy) iterator.next();
					browser2.save();
				}
				tableViewer.refresh();
			}
		});
		WorkbenchHelp.setHelp(search, ContextIds.PREF_BROWSER_EXTERNAL_SEARCH);
		
		tableViewer.addCheckStateListener(new ICheckStateListener() {
			public void checkStateChanged(CheckStateChangedEvent e) {
				checkNewDefaultBrowser(e.getElement());
				IWebBrowser browser2 = (IWebBrowser) e.getElement();
				BrowserManager.getInstance().setCurrentWebBrowser(browser2);
			}
		});
		search.setEnabled(true);
	}
	
	public IWebBrowser getSelectedWebBrowser() {
		return selection;
	}
	
	protected Object getSelection(ISelection sel2) {
		IStructuredSelection sel = (IStructuredSelection) sel2;
		return sel.getFirstElement();
	}
	
	// Uncheck all the items except the current one that was just checked
	protected void checkNewDefaultBrowser(Object browser) {
		TableItem[] children = tableViewer.getTable().getItems();
		for (int i = 0; i < children.length; i++) {
			TableItem item = children[i];
			
			if (!(item.getData().equals(browser))) 
				item.setChecked(false);
		}
	}
}