/*******************************************************************************
 * Copyright (c) 2005, 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.update.internal.ui.views;

import java.lang.reflect.InvocationTargetException;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.jface.dialogs.ErrorDialog;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.update.configuration.IConfiguredSite;
import org.eclipse.update.core.IFeature;
import org.eclipse.update.internal.core.InstallRegistry;
import org.eclipse.update.internal.operations.OperationFactory;
import org.eclipse.update.internal.operations.UpdateUtils;
import org.eclipse.update.internal.ui.UpdateUI;
import org.eclipse.update.internal.ui.UpdateUIMessages;
import org.eclipse.update.internal.ui.model.ConfiguredFeatureAdapter;
import org.eclipse.update.operations.IFeatureOperation;
import org.eclipse.update.operations.IOperation;
import org.eclipse.update.operations.OperationsManager;

public class FeaturesStateAction extends FeatureAction {

	
	private ConfiguredFeatureAdapter[] adapters;

    public FeaturesStateAction(Shell shell, String text) {
        super(shell, text);
        setWindowTitle(UpdateUIMessages.FeatureStateAction_dialogTitle);
    }
    
	public void setSelection(IStructuredSelection selection) {

		this.adapters = (ConfiguredFeatureAdapter[]) selection.toList().toArray(new ConfiguredFeatureAdapter[selection.size()]);
		if (canUnconfigure()) {
			setText(UpdateUIMessages.FeatureStateAction_disable); 
		} else {
			setText(UpdateUIMessages.FeatureStateAction_enable); 
		}

	}
	
	public void run() {
		try {
			if ( (adapters == null) && (adapters.length == 0))
				return;
			
			IStatus status = OperationsManager.getValidator().validatePlatformConfigValid();
			if (status != null)
				throw new CoreException(status);
			
			boolean isConfigured = canUnconfigure();
			// Ask user to confirm the operation
			String message =
				isConfigured
					? UpdateUIMessages.FeatureStateAction_disableQuestion
					: UpdateUIMessages.FeatureStateAction_EnableQuestion; 

			if (!confirm(message))
				return;

			// If current config is broken, confirm with the user to continue
			if (OperationsManager.getValidator().validateCurrentState() != null &&
					!confirm(UpdateUIMessages.Actions_brokenConfigQuestion)) 
				return;
			
			IOperation toggleOperation = null;
			
			IFeature[] features = new IFeature[adapters.length];
			IConfiguredSite[] configuredSites = new IConfiguredSite[adapters.length];
			for( int i = 0; i < adapters.length; i++) {
				features[i] = adapters[i].getFeature(null);
				configuredSites[i] = adapters[i].getConfiguredSite();
			}
			
			if (isConfigured) {
				toggleOperation = ((OperationFactory)OperationsManager.getOperationFactory()).createUnconfigureFeaturesOperation( configuredSites, features);
			} else if (canConfigure()){
				toggleOperation = ((OperationFactory)OperationsManager.getOperationFactory()).createConfigureFeaturesOperation( configuredSites, features);
			}
			
			if (toggleOperation != null) {
				boolean restartNeeded = toggleOperation.execute(null, null);
				UpdateUI.requestRestart(restartNeeded);
			}

		} catch (CoreException e) {
			ErrorDialog.openError(shell,
                    null, null, e.getStatus());
		} catch (InvocationTargetException e) {
			// This should not happen
			UpdateUtils.logException(e.getTargetException());
		}
	}
	
	public boolean canExecuteAction() {
		return canConfigure() || canUnconfigure();
	}
	
	private boolean canConfigure() {
		
		if (adapters == null || adapters.length == 0)
			return false;
		
		for( int i = 0; i < adapters.length; i++) {
			
			if (adapters[i].isConfigured())
				return false;
		
			try {
				// check for pending changes (e.g. if the feature has just been disabled)
				IFeatureOperation pendingOperation = OperationsManager.findPendingOperation(adapters[i].getFeature(null));
				if (pendingOperation != null)
					return false;

				if (InstallRegistry.getInstance().get("feature_"+adapters[i].getFeature(null).getVersionedIdentifier()) == null) //$NON-NLS-1$
					return false;
			} catch (CoreException e) {
				return false;
			}
		}
				
		return true;	
	}
	
	private boolean canUnconfigure() {
		
		if (adapters == null || adapters.length == 0)
			return false;
		
		for( int i = 0; i < adapters.length; i++) {
			
			if (!adapters[i].isConfigured())
				return false;
		
			try {
				// check for pending changes (e.g. if the feature has just been disabled)
				IFeatureOperation pendingOperation = OperationsManager.findPendingOperation(adapters[i].getFeature(null));
				if (pendingOperation != null)
					return false;

				if (InstallRegistry.getInstance().get("feature_"+adapters[i].getFeature(null).getVersionedIdentifier()) == null) //$NON-NLS-1$
					return false;
			} catch (CoreException e) {
				return false;
			}
		}
				
		return true;	
	}
	

}