/*******************************************************************************
 * Copyright (c) 2000, 2006 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.team.internal.ui.wizards;


import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.*;
import org.eclipse.jface.wizard.IWizardPage;
import org.eclipse.jface.wizard.Wizard;
import org.eclipse.team.internal.ui.*;
import org.eclipse.team.ui.IConfigurationWizard;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.activities.IActivityManager;
import org.eclipse.ui.activities.IIdentifier;
import org.eclipse.ui.model.AdaptableList;

/**
 * The wizard for associating projects with team providers
 */
public class ConfigureProjectWizard extends Wizard implements IConfigurationWizard {
	protected IWorkbench workbench;
	protected IProject project;
	protected IConfigurationWizard wizard;
	
	protected ConfigureProjectWizardMainPage mainPage;
	private String pluginId = TeamUIPlugin.PLUGIN_ID;
	
	protected final static String PT_CONFIGURATION ="configurationWizards"; //$NON-NLS-1$
	protected final static String TAG_WIZARD = "wizard"; //$NON-NLS-1$
	protected final static String TAG_DESCRIPTION = "description"; //$NON-NLS-1$
	protected final static String ATT_NAME = "name"; //$NON-NLS-1$
	protected final static String ATT_CLASS = "class"; //$NON-NLS-1$
	protected final static String ATT_ICON = "icon"; //$NON-NLS-1$
	protected final static String ATT_ID = "id"; //$NON-NLS-1$
	
	public ConfigureProjectWizard() {
		setNeedsProgressMonitor(true);
		setWindowTitle(getWizardWindowTitle()); 
	}
	
	protected String getExtensionPoint() {
		return PT_CONFIGURATION;
	}
	
	protected String getWizardWindowTitle() {
		return TeamUIMessages.ConfigureProjectWizard_title; 
	}
	
	protected String getWizardLabel() {
		return TeamUIMessages.ConfigureProjectWizard_configureProject; 
	}
	
	protected String getWizardDescription() {
		return TeamUIMessages.ConfigureProjectWizard_description; 
	}
	
	/*
	 * @see Wizard#addPages
	 */
	public void addPages() {
		AdaptableList disabledWizards = new AdaptableList();
		AdaptableList wizards = getAvailableWizards(disabledWizards);	
		if (wizards.size() == 1 && disabledWizards.size() == 0) {
			// If there is only one wizard, skip the first page.
			// Only skip the first page if the one wizard has at least one page.
			ConfigurationWizardElement element = (ConfigurationWizardElement)wizards.getChildren()[0];
			try {
				this.wizard = (IConfigurationWizard)element.createExecutableExtension();
				wizard.init(workbench, project);
				wizard.addPages();
				if (wizard.getPageCount() > 0) {
					wizard.setContainer(getContainer());
					IWizardPage[] pages = wizard.getPages();
					for (int i = 0; i < pages.length; i++) {
						addPage(pages[i]);
					}
					return;
				}
			} catch (CoreException e) {
				TeamUIPlugin.log(e);
				return;
			}
		}
		mainPage = new ConfigureProjectWizardMainPage("configurePage1", getWizardLabel(), TeamUIPlugin.getImageDescriptor(ITeamUIImages.IMG_WIZBAN_SHARE), wizards, disabledWizards); //$NON-NLS-1$
		mainPage.setDescription(getWizardDescription());
		mainPage.setProject(project);
		mainPage.setWorkbench(workbench);
		addPage(mainPage);
	}
	public IWizardPage getNextPage(IWizardPage page) {
		if (wizard != null) {
			return wizard.getNextPage(page);
		}
		return super.getNextPage(page);
	}
	public boolean canFinish() {
		// If we are on the first page, never allow finish unless the selected wizard has no pages.
		if (getContainer().getCurrentPage() == mainPage) {
			if (mainPage.getSelectedWizard() != null && mainPage.getNextPage() == null) {
				return true;
			}
			return false;
		}
		if (wizard != null) {
			return wizard.canFinish();
		}
		return super.canFinish();
	}
	/*
	 * @see Wizard#performFinish
	 */
	public boolean performFinish() {
		// There is only one wizard with at least one page
		if (wizard != null) {
			return wizard.performFinish();
		}
		// If we are on the first page and the selected wizard has no pages then
		// allow it to finish.
		if (getContainer().getCurrentPage() == mainPage) {
			IConfigurationWizard noPageWizard = mainPage.getSelectedWizard();
			if (noPageWizard != null) {
				if (noPageWizard.canFinish()) 
				{
					return noPageWizard.performFinish();
				}
			}
		}
		// If the wizard has pages and there are several
		// wizards registered then the registered wizard
		// will call it's own performFinish().		
		return true;
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.jface.wizard.IWizard#performCancel()
	 */
	public boolean performCancel() {
		if (wizard != null) {
			return wizard.performCancel();
		}
		return super.performCancel();
	}
	
	/**
	 * Returns the configuration wizards that are available for invocation.
	 * 
	 * @return the available wizards
	 */
	protected AdaptableList getAvailableWizards(AdaptableList disabledWizards) {
		AdaptableList result = new AdaptableList();
		IExtensionRegistry registry = Platform.getExtensionRegistry();
		IExtensionPoint point = registry.getExtensionPoint(pluginId, getExtensionPoint());
		if (point != null) {
			IExtension[] extensions = point.getExtensions();
			for (int i = 0; i < extensions.length; i++) {
				IConfigurationElement[] elements = extensions[i].getConfigurationElements();
				for (int j = 0; j < elements.length; j++) {
					IConfigurationElement element = elements[j];
					if (element.getName().equals(TAG_WIZARD)) {
						ConfigurationWizardElement wizard = createWizardElement(element);
						if (wizard != null && filterItem(element)) {
							disabledWizards.add(wizard);
						} else if (wizard != null) {
							result.add(wizard);
						}
					}
				}
			}
		}
		return result;
	}
	
	private boolean filterItem(IConfigurationElement element) {
		String extensionId = element.getAttribute(ATT_ID);
		String extensionPluginId = element.getNamespace();
	    IActivityManager activityMgr = PlatformUI.getWorkbench().getActivitySupport().getActivityManager();
	    IIdentifier id = activityMgr.getIdentifier(extensionPluginId + "/" +  extensionId); //$NON-NLS-1$
	    return (!id.isEnabled());
	}
	
	/**
	 * Returns a new ConfigurationWizardElement configured according to the parameters
	 * contained in the passed Registry.  
	 *
	 * May answer null if there was not enough information in the Extension to create 
	 * an adequate wizard
	 * 
	 * @param element  the element for which to create a wizard element
	 * @return the wizard element for the given element
	 */
	protected ConfigurationWizardElement createWizardElement(IConfigurationElement element) {
		// WizardElements must have a name attribute
		String nameString = element.getAttribute(ATT_NAME);
		if (nameString == null) {
			// Missing attribute
			return null;
		}
		ConfigurationWizardElement result = new ConfigurationWizardElement(nameString);
		if (initializeWizard(result, element)) {
			// initialization was successful
			return result;
		}
		return null;
	}
	/**
	 *	Initialize the passed element's properties based on the contents of
	 *	the passed registry.  Answer a boolean indicating whether the element
	 *	was able to be adequately initialized.
	 *
	 *	@param element  the element to initialize the properties for
	 *	@param extension  the registry to get properties from
	 *	@return whether initialization was successful
	 */
	protected boolean initializeWizard(ConfigurationWizardElement element, IConfigurationElement config) {
		element.setID(config.getAttribute(ATT_ID));
		String description = ""; //$NON-NLS-1$
		IConfigurationElement [] children = config.getChildren(TAG_DESCRIPTION);
		if (children.length >= 1) {
			description = children[0].getValue();
		}

		element.setDescription(description);
	
		// apply CLASS and ICON properties	
		element.setConfigurationElement(config);
		String iconName = config.getAttribute(ATT_ICON);
		if (iconName != null) {
			IExtension extension = config.getDeclaringExtension();
			element.setImageDescriptor(TeamUIPlugin.getImageDescriptorFromExtension(extension, iconName));
		}
		// ensure that a class was specified
		if (element.getConfigurationElement() == null) {
			// Missing attribute
			return false;
		}
		setForcePreviousAndNextButtons(true);
		return true;	
	}
	/*
	 * Method declared on IConfigurationWizard
	 */
	public void init(IWorkbench workbench, IProject project) {
		this.workbench = workbench;
		this.project = project;
	}
}
