/*******************************************************************************
 * Copyright (c) 2003, 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.wst.web.ui.internal.wizards;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;

import org.eclipse.jface.dialogs.IDialogSettings;
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.Button;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Group;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.PlatformUI;
import org.eclipse.wst.common.componentcore.datamodel.properties.IFacetProjectCreationDataModelProperties;
import org.eclipse.wst.common.frameworks.datamodel.DataModelEvent;
import org.eclipse.wst.common.frameworks.datamodel.DataModelPropertyDescriptor;
import org.eclipse.wst.common.frameworks.datamodel.IDataModel;
import org.eclipse.wst.common.frameworks.datamodel.IDataModelListener;
import org.eclipse.wst.common.frameworks.internal.datamodel.ui.DataModelWizardPage;
import org.eclipse.wst.common.frameworks.internal.operations.IProjectCreationPropertiesNew;
import org.eclipse.wst.common.frameworks.internal.ui.NewProjectGroup;
import org.eclipse.wst.common.project.facet.core.IFacetedProjectWorkingCopy;
import org.eclipse.wst.common.project.facet.core.events.IFacetedProjectEvent;
import org.eclipse.wst.common.project.facet.core.events.IFacetedProjectListener;
import org.eclipse.wst.common.project.facet.core.runtime.IRuntime;
import org.eclipse.wst.common.project.facet.core.runtime.RuntimeManager;
import org.eclipse.wst.common.project.facet.ui.ModifyFacetedProjectWizard;
import org.eclipse.wst.common.project.facet.ui.PresetSelectionPanel;
import org.eclipse.wst.project.facet.ProductManager;
import org.eclipse.wst.server.ui.ServerUIUtil;
import org.eclipse.wst.web.internal.ResourceHandler;

public class DataModelFacetCreationWizardPage extends DataModelWizardPage implements IFacetProjectCreationDataModelProperties {

	private static final String NULL_RUNTIME = "NULL_RUNTIME"; //$NON-NLS-1$
	private static final String MRU_RUNTIME_STORE = "MRU_RUNTIME_STORE"; //$NON-NLS-1$
	
	private static final String[] VALIDATION_PROPERTIES = 
	{
	    IProjectCreationPropertiesNew.PROJECT_NAME, 
	    IProjectCreationPropertiesNew.PROJECT_LOCATION, 
	    FACET_RUNTIME,
	    FACETED_PROJECT_WORKING_COPY
	};
	
	protected static GridData gdhfill() {
		return new GridData(GridData.FILL_HORIZONTAL);
	}
    
    protected static GridData hspan( final GridData gd,
                                     final int span ) 
    {
        gd.horizontalSpan = span;
        return gd;
    }

	protected Composite createTopLevelComposite(Composite parent) {
		Composite top = new Composite(parent, SWT.NONE);
		PlatformUI.getWorkbench().getHelpSystem().setHelp(top, getInfopopID());
		top.setLayout(new GridLayout());
		top.setLayoutData(new GridData(GridData.FILL_BOTH));
		createProjectGroup(top);
		createServerTargetComposite(top);
        createPresetPanel(top);
        return top;
	}

	protected void createPresetPanel(Composite top) {
		final IFacetedProjectWorkingCopy fpjwc
            = ( (ModifyFacetedProjectWizard) getWizard() ).getFacetedProjectWorkingCopy();

        final PresetSelectionPanel ppanel = new PresetSelectionPanel( top, fpjwc );
        
        ppanel.setLayoutData( gdhfill() );
	}
	
	public static boolean launchNewRuntimeWizard(Shell shell, IDataModel model) {
		return launchNewRuntimeWizard(shell, model, null);
	}
	
	public static boolean launchNewRuntimeWizard(Shell shell, final IDataModel model, String serverTypeID) 
	{
	    if( model == null )
	    {
	        return false;
	    }
	    
		final DataModelPropertyDescriptor[] preAdditionDescriptors = model.getValidPropertyDescriptors(FACET_RUNTIME);
		
		final boolean[] keepWaiting = { true };
		
		final IDataModelListener listener = new IDataModelListener()
		{
            public void propertyChanged( final DataModelEvent event )
            {
                if( event.getPropertyName().equals( FACET_RUNTIME ) &&
                    event.getFlag() == DataModelEvent.VALID_VALUES_CHG )
                {
                    synchronized( keepWaiting )
                    {
                        keepWaiting[ 0 ] = false;
                        keepWaiting.notify();
                    }
                    
                    model.removeListener( this );
                }
            }
		};
		
		model.addListener( listener );
		
		boolean isOK = ServerUIUtil.showNewRuntimeWizard(shell, serverTypeID, null);
		
		if( isOK ) 
		{
		    // Do the rest of the processing in a separate thread. Since we are going to block
		    // and wait, doing this on the UI thread can cause hangs.
		    
		    final Thread newRuntimeSelectionThread = new Thread()
		    {
		        public void run()
		        {
        		    // Causes the list of runtimes held by the RuntimeManager to be refreshed and 
        		    // triggers events to listeners on that list.
        		    
        		    RuntimeManager.getRuntimes();
        		    
        		    // Wait until the list of valid values has updated to include the new runtime.
        		    
        		    synchronized( keepWaiting )
        		    {
        		        while( keepWaiting[ 0 ] == true )
        		        {
        		            try
        		            {
        		                keepWaiting.wait();
        		            }
        		            catch( InterruptedException e ) {}
        		        }
        		    }
        		    
        		    // Select the new runtime.
        		    
        			DataModelPropertyDescriptor[] postAdditionDescriptors = model.getValidPropertyDescriptors(FACET_RUNTIME);
        			Object[] preAddition = new Object[preAdditionDescriptors.length];
        			for (int i = 0; i < preAddition.length; i++) {
        				preAddition[i] = preAdditionDescriptors[i].getPropertyValue();
        			}
        			Object[] postAddition = new Object[postAdditionDescriptors.length];
        			for (int i = 0; i < postAddition.length; i++) {
        				postAddition[i] = postAdditionDescriptors[i].getPropertyValue();
        			}
        			Object newAddition = getNewObject(preAddition, postAddition);
        
        			if (newAddition != null) // can this ever be null?
        				model.setProperty(FACET_RUNTIME, newAddition);
		        }
		    };
		    
		    newRuntimeSelectionThread.start();
		    
		    return true;
		}
		else
		{
		    model.removeListener( listener );
		    return false;
		}
	}
	
	public boolean internalLaunchNewRuntimeWizard(Shell shell, IDataModel model) {
		return launchNewRuntimeWizard(shell, model, getModuleTypeID());
	}
	
	protected String getModuleTypeID() {
		return null;
	}
	
	protected Combo serverTargetCombo;
	protected NewProjectGroup projectNameGroup;
	private final IFacetedProjectWorkingCopy fpjwc;
	private final IFacetedProjectListener fpjwcListener;

	public DataModelFacetCreationWizardPage(IDataModel dataModel, String pageName) 
	{
		super(dataModel, pageName);
		
        this.fpjwc = (IFacetedProjectWorkingCopy) this.model.getProperty( FACETED_PROJECT_WORKING_COPY );
        
        this.fpjwcListener = new IFacetedProjectListener()
        {
            public void handleEvent( final IFacetedProjectEvent event )
            {
                validatePage();
            }
        };
        
        this.fpjwc.addListener( this.fpjwcListener, IFacetedProjectEvent.Type.VALIDATION_PROBLEMS_CHANGED );
	}

	protected void createServerTargetComposite(Composite parent) {
        Group group = new Group(parent, SWT.NONE);
        group.setText(ResourceHandler.TargetRuntime);
        group.setLayoutData(gdhfill());
        group.setLayout(new GridLayout(2, false));
		serverTargetCombo = new Combo(group, SWT.BORDER | SWT.READ_ONLY);
		serverTargetCombo.setLayoutData(gdhfill());
		Button newServerTargetButton = new Button(group, SWT.NONE);
		newServerTargetButton.setText(ResourceHandler.NewDotDotDot);
		newServerTargetButton.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				if (!internalLaunchNewRuntimeWizard(getShell(), model)) {
					//Bugzilla 135288
					//setErrorMessage(ResourceHandler.InvalidServerTarget);
				}
			}
		});
		Control[] deps = new Control[]{newServerTargetButton};
		synchHelper.synchCombo(serverTargetCombo, FACET_RUNTIME, deps);
		if (serverTargetCombo.getSelectionIndex() == -1 && serverTargetCombo.getVisibleItemCount() != 0)
			serverTargetCombo.select(0);
	}

	protected void createProjectGroup(Composite parent) {
		IDataModel nestedProjectDM = model.getNestedModel(NESTED_PROJECT_DM);
		nestedProjectDM.addListener(this);
		projectNameGroup = new NewProjectGroup(parent, nestedProjectDM);
	}

	protected String[] getValidationPropertyNames() 
	{
	    return VALIDATION_PROPERTIES;
	}

	public void dispose() {
		super.dispose();
		if (projectNameGroup != null)
			projectNameGroup.dispose();
		
		this.fpjwc.removeListener( this.fpjwcListener );
	}

	public void storeDefaultSettings() {
		IDialogSettings settings = getDialogSettings();
		DataModelFacetCreationWizardPage.saveRuntimeSettings(settings, model);
	}

	public void restoreDefaultSettings() {
		IDialogSettings settings = getDialogSettings();
		DataModelFacetCreationWizardPage.restoreRuntimeSettings(settings, model);
	}
	
	public static void saveRuntimeSettings(IDialogSettings settings, IDataModel model){
		if (settings != null) {
			String[] mruRuntimeArray = settings.getArray(MRU_RUNTIME_STORE);
			List mruRuntimes = new ArrayList();
			if(mruRuntimeArray != null)
				mruRuntimes.addAll(Arrays.asList(mruRuntimeArray));
			
			IRuntime runtime = (IRuntime) model.getProperty(IFacetProjectCreationDataModelProperties.FACET_RUNTIME);
			String runtimeName = runtime == null ? NULL_RUNTIME : runtime.getName();
			
			if (mruRuntimes.contains(runtimeName)) {
				mruRuntimes.remove(runtimeName);
			}
			mruRuntimes.add(0, runtimeName);
			while (mruRuntimes.size() > 5) {
				mruRuntimes.remove(5);
			}
			mruRuntimeArray = new String[mruRuntimes.size()];
			for (int i = 0; i < mruRuntimeArray.length; i++) {
				mruRuntimeArray[i] = (String) mruRuntimes.get(i);
			}
			settings.put(MRU_RUNTIME_STORE, mruRuntimeArray);
		}
	}
	
	public static void restoreRuntimeSettings(IDialogSettings settings, IDataModel model){
		if (settings != null) {
			if (!model.isPropertySet(IFacetProjectCreationDataModelProperties.FACET_RUNTIME)) {
				boolean runtimeSet = false;
				String[] mruRuntimeArray = settings.getArray(MRU_RUNTIME_STORE);
				DataModelPropertyDescriptor[] descriptors = model.getValidPropertyDescriptors(IFacetProjectCreationDataModelProperties.FACET_RUNTIME);
				List mruRuntimes = new ArrayList();
				if (mruRuntimeArray == null) {
					List defRuntimes = ProductManager.getDefaultRuntimes();
					for (Iterator iter = defRuntimes.iterator(); iter.hasNext();)
						mruRuntimes.add(((IRuntime) iter.next()).getName());
				} else {
					mruRuntimes.addAll(Arrays.asList(mruRuntimeArray));
				}
				if (!mruRuntimes.isEmpty()) {
					for (int i = 0; i < mruRuntimes.size() && !runtimeSet; i++) {
						for (int j = 0; j < descriptors.length-1 && !runtimeSet; j++) {
							if (mruRuntimes.get(i).equals(descriptors[j].getPropertyDescription())) {
								model.setProperty(IFacetProjectCreationDataModelProperties.FACET_RUNTIME, descriptors[j].getPropertyValue());
								runtimeSet = true;
							}
						}
						if(!runtimeSet && mruRuntimes.get(i).equals(NULL_RUNTIME)){
							model.setProperty(IFacetProjectCreationDataModelProperties.FACET_RUNTIME, descriptors[descriptors.length -1].getPropertyValue());
							runtimeSet = true;
						}
					}
				}
				if (!runtimeSet && descriptors.length > 0) {
					model.setProperty(IFacetProjectCreationDataModelProperties.FACET_RUNTIME, descriptors[0].getPropertyValue());
				}
			}
		}
	}
	

	/**
	 * Find first newObject that is not in the oldObjects array (using "==").
	 * 
	 * @param oldObjects
	 * @param newObjects
	 * @return first newObject not found in oldObjects, or <code>null</code> if all found.
	 * 
	 * @since 1.0.0
	 */
	private static Object getNewObject(Object[] oldObjects, Object[] newObjects) {
		if (oldObjects != null && newObjects != null && oldObjects.length < newObjects.length) {
			for (int i = 0; i < newObjects.length; i++) {
				boolean found = false;
				Object object = newObjects[i];
				for (int j = 0; j < oldObjects.length; j++) {
					if (oldObjects[j] == object) {
						found = true;
						break;
					}
				}
				if (!found)
					return object;
			}
		}
		if (oldObjects == null && newObjects != null && newObjects.length == 1)
			return newObjects[0];
		return null;
	}
	
}