/*******************************************************************************
 * 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
 *     J�r�me N�gre    - adaptation of ListEditor to add the search button
 *******************************************************************************/
package net.sourceforge.phpeclipse.news.pref;

import java.util.ArrayList;

import net.sourceforge.phpeclipse.news.Channel;
import net.sourceforge.phpeclipse.news.Plugin;
import net.sourceforge.phpeclipse.news.search.SearchDialog;

import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.dialogs.InputDialog;
import org.eclipse.jface.preference.FieldEditor;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.util.Assert;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.List;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Widget;

public class SiteListEditor extends FieldEditor {
	/**
	 * The list widget; <code>null</code> if none
	 * (before creation or after disposal).
	 */
	private List list;
	private ArrayList channels;
	/**
	 * The button box containing the Add, Remove, Up, and Down buttons;
	 * <code>null</code> if none (before creation or after disposal).
	 */
	private Composite buttonBox;
	/**
	 * The Add button.
	 */
	private Button addButton;
	/**
	 * The Search button.
	 */
	private Button searchButton;
	/**
	 * The Remove button.
	 */
	private Button removeButton;
	/**
	 * The Up button.
	 */
	private Button upButton;
	/**
	 * The Down button.
	 */
	private Button downButton;
	/**
	 * The selection listener.
	 */
	private SelectionListener selectionListener;
	/**
	 * Notifies that the Add button has been pressed.
	 */
	private void addPressed() {
		setPresentsDefaultValue(false);
		Channel input = getNewInputChannel();
		if (input != null) {
			int index = list.getSelectionIndex();
			if (index >= 0) {
				list.add(input.getTitle(), index + 1);
				channels.add(index + 1, input);
			} else {
				list.add(input.getTitle(), 0);
				channels.add(0, input);
			}
			selectionChanged();
		}
	}

	/**
	 * Notifies that the Search button has been pressed.
	 */
	private void searchPressed() {
		setPresentsDefaultValue(false);
		SearchDialog sd = new SearchDialog(SiteListEditor.this
				.getShell());
		sd.open();
		Channel[] inputs = sd.getChannels();
		for(int i=0; i<inputs.length; i++) {
			int index = list.getSelectionIndex();
			if (index >= 0) {
				list.add(inputs[i].getTitle(), index + 1);
				channels.add(index + 1, inputs[i]);
			} else {
				list.add(inputs[i].getTitle(), 0);
				channels.add(0, inputs[i]);
			}
		}
		selectionChanged();
	}

	
	/* (non-Javadoc)
	 * Method declared on FieldEditor.
	 */
	protected void adjustForNumColumns(int numColumns) {
		Control control = getLabelControl();
		((GridData) control.getLayoutData()).horizontalSpan = numColumns;
		((GridData) list.getLayoutData()).horizontalSpan = numColumns - 1;
	}
	/**
	 * Creates the Add, Remove, Up, and Down button in the given button box.
	 *
	 * @param buttonBox the box for the buttons
	 */
	private void createButtons(Composite buttonBox) {
		addButton = createPushButton(buttonBox, "ListEditor.add");//$NON-NLS-1$
		//TODO use my bundle ?
		searchButton = createPushButton(buttonBox, "Search (experimental)");
		removeButton = createPushButton(buttonBox, "ListEditor.remove");//$NON-NLS-1$
		upButton = createPushButton(buttonBox, "ListEditor.up");//$NON-NLS-1$
		downButton = createPushButton(buttonBox, "ListEditor.down");//$NON-NLS-1$
	}
	/**
	 * Helper method to create a push button.
	 * 
	 * @param parent the parent control
	 * @param key the resource name used to supply the button's label text
	 */
	private Button createPushButton(Composite parent, String key) {
		Button button = new Button(parent, SWT.PUSH);
		button.setText(JFaceResources.getString(key));
		button.setFont(parent.getFont());
		GridData data = new GridData(GridData.FILL_HORIZONTAL);
		data.heightHint = convertVerticalDLUsToPixels(button,
				IDialogConstants.BUTTON_HEIGHT);
		int widthHint = convertHorizontalDLUsToPixels(button,
				IDialogConstants.BUTTON_WIDTH);
		data.widthHint = Math.max(widthHint, button.computeSize(SWT.DEFAULT,
				SWT.DEFAULT, true).x);
		button.setLayoutData(data);
		button.addSelectionListener(getSelectionListener());
		return button;
	}
	/**
	 * Creates a selection listener.
	 */
	public void createSelectionListener() {
		selectionListener = new SelectionAdapter() {
			public void widgetSelected(SelectionEvent event) {
				Widget widget = event.widget;
				if (widget == addButton) {
					addPressed();
				} else if (widget == searchButton) {
					searchPressed();
				} else if (widget == removeButton) {
					removePressed();
				} else if (widget == upButton) {
					upPressed();
				} else if (widget == downButton) {
					downPressed();
				} else if (widget == list) {
					selectionChanged();
				}
			}
		};
	}
	/* (non-Javadoc)
	 * Method declared on FieldEditor.
	 */
	protected void doFillIntoGrid(Composite parent, int numColumns) {
		Control control = getLabelControl(parent);
		GridData gd = new GridData();
		gd.horizontalSpan = numColumns;
		control.setLayoutData(gd);
		list = getListControl(parent);
		gd = new GridData(GridData.FILL_HORIZONTAL);
		gd.verticalAlignment = GridData.FILL;
		gd.horizontalSpan = numColumns - 1;
		gd.grabExcessHorizontalSpace = true;
		list.setLayoutData(gd);
		buttonBox = getButtonBoxControl(parent);
		gd = new GridData();
		gd.verticalAlignment = GridData.BEGINNING;
		buttonBox.setLayoutData(gd);
	}
	/* (non-Javadoc)
	 * Method declared on FieldEditor.
	 */
	protected void doLoad() {
		if (list != null) {
			channels = ChannelStore.getChannels();
			for (int i = 0; i < channels.size(); i++) {
				list.add(((Channel)channels.get(i)).getTitle());
			}
		}
	}
	/* (non-Javadoc)
	 * Method declared on FieldEditor.
	 */
	protected void doLoadDefault() {
		if (list != null) {
			list.removeAll();
			channels = ChannelStore.getDefaultChannels();
			for (int i = 0; i < channels.size(); i++) {
				list.add(((Channel)channels.get(i)).getTitle());
			}
			setPresentsDefaultValue(false);
		}
	}
	/* (non-Javadoc)
	 * Method declared on FieldEditor.
	 */
	protected void doStore() {
		ChannelStore.saveReadStatus(Plugin.getDefault().getChannelList());
		ChannelStore.setChannels(channels);
		Plugin.getDefault().updateChannelList();
	}
	/**
	 * Notifies that the Down button has been pressed.
	 */
	private void downPressed() {
		swap(false);
	}
	/**
	 * Returns this field editor's button box containing the Add, Remove,
	 * Up, and Down button.
	 *
	 * @param parent the parent control
	 * @return the button box
	 */
	public Composite getButtonBoxControl(Composite parent) {
		if (buttonBox == null) {
			buttonBox = new Composite(parent, SWT.NULL);
			GridLayout layout = new GridLayout();
			layout.marginWidth = 0;
			buttonBox.setLayout(layout);
			createButtons(buttonBox);
			buttonBox.addDisposeListener(new DisposeListener() {
				public void widgetDisposed(DisposeEvent event) {
					addButton = null;
					searchButton = null;
					removeButton = null;
					upButton = null;
					downButton = null;
					buttonBox = null;
				}
			});
		} else {
			checkParent(buttonBox, parent);
		}
		selectionChanged();
		return buttonBox;
	}
	/**
	 * Returns this field editor's list control.
	 *
	 * @param parent the parent control
	 * @return the list control
	 */
	public List getListControl(Composite parent) {
		if (list == null) {
			list = new List(parent, SWT.BORDER | SWT.SINGLE | SWT.V_SCROLL
					| SWT.H_SCROLL);
			list.setFont(parent.getFont());
			list.addSelectionListener(getSelectionListener());
			list.addDisposeListener(new DisposeListener() {
				public void widgetDisposed(DisposeEvent event) {
					list = null;
				}
			});
		} else {
			checkParent(list, parent);
		}
		return list;
	}
	/* (non-Javadoc)
	 * Method declared on FieldEditor.
	 */
	public int getNumberOfControls() {
		return 2;
	}
	/**
	 * Returns this field editor's selection listener.
	 * The listener is created if nessessary.
	 *
	 * @return the selection listener
	 */
	private SelectionListener getSelectionListener() {
		if (selectionListener == null)
			createSelectionListener();
		return selectionListener;
	}
	/**
	 * Returns this field editor's shell.
	 * <p>
	 * This method is internal to the framework; subclassers should not call
	 * this method.
	 * </p>
	 *
	 * @return the shell
	 */
	protected Shell getShell() {
		if (addButton == null)
			return null;
		return addButton.getShell();
	}
	/**
	 * Notifies that the Remove button has been pressed.
	 */
	private void removePressed() {
		setPresentsDefaultValue(false);
		int index = list.getSelectionIndex();
		if (index >= 0) {
			list.remove(index);
			channels.remove(index);
			selectionChanged();
		}
	}
	/**
	 * Notifies that the list selection has changed.
	 */
	private void selectionChanged() {
		int index = list.getSelectionIndex();
		int size = list.getItemCount();
		removeButton.setEnabled(index >= 0);
		upButton.setEnabled(size > 1 && index > 0);
		downButton.setEnabled(size > 1 && index >= 0 && index < size - 1);
	}
	/* (non-Javadoc)
	 * Method declared on FieldEditor.
	 */
	public void setFocus() {
		if (list != null) {
			list.setFocus();
		}
	}
	/**
	 * Moves the currently selected item up or down.
	 *
	 * @param up <code>true</code> if the item should move up,
	 *  and <code>false</code> if it should move down
	 */
	private void swap(boolean up) {
		setPresentsDefaultValue(false);
		int index = list.getSelectionIndex();
		int target = up ? index - 1 : index + 1;
		if (index >= 0) {
			//list widget
			String[] selection = list.getSelection();
			Assert.isTrue(selection.length == 1);
			list.remove(index);
			list.add(selection[0], target);
			list.setSelection(target);
			//channels arrayList
			Object obj = channels.remove(index);
			channels.add(target, obj);
		}
		selectionChanged();
	}
	/**
	 * Notifies that the Up button has been pressed.
	 */
	private void upPressed() {
		swap(true);
	}
	/*
	 * @see FieldEditor.setEnabled(boolean,Composite).
	 */
	public void setEnabled(boolean enabled, Composite parent) {
		super.setEnabled(enabled, parent);
		getListControl(parent).setEnabled(enabled);
		addButton.setEnabled(enabled);
		removeButton.setEnabled(enabled);
		upButton.setEnabled(enabled);
		downButton.setEnabled(enabled);
	}

	/*
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 */
	
	/**
	 * Creates a site list field editor.
	 * 
	 * @param name the name of the preference this field editor works on
	 * @param labelText the label text of the field editor
	 * @param parent the parent of the field editor's control
	 */
	protected SiteListEditor(String name, String labelText, Composite parent) {
		init(name, labelText);
		createControl(parent);
	}
	/**
	 * Creates and returns a new item for the list.
	 *
	 * @return a new item
	 */
	protected Channel getNewInputChannel() {
		InputDialog dialog;
		dialog = new InputDialog(this.getShell(), "All The News",
				"Enter new site name", "", null);
		dialog.open();
		if ("".equals(dialog.getValue()) || dialog.getValue() == null)
			return null;
		String title = dialog.getValue();
		dialog = new InputDialog(this.getShell(), "All The News",
				"Enter new site URL", "", null);
		dialog.open();
		if ("".equals(dialog.getValue()) || dialog.getValue() == null)
			return null;
		String url = dialog.getValue();
		return new Channel(title, url);
	}
}