/*

 * Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). 

 * All rights reserved.

 * This component and the accompanying materials are made available

 * under the terms of the License "Eclipse Public License v1.0"

 * which accompanies this distribution, and is available

 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

 *

 * Initial Contributors:

 * Nokia Corporation - initial contribution.

 *

 * Contributors:

 *

 * Description: 

 *

 */

package com.nokia.carbide.cpp.internal.pi.wizards.ui;

import java.util.ArrayList;

import org.eclipse.core.resources.IContainer;

import org.eclipse.core.resources.IFile;

import org.eclipse.core.resources.IFolder;

import org.eclipse.core.resources.IProject;

import org.eclipse.core.resources.IResource;

import org.eclipse.core.resources.IWorkspaceRoot;

import org.eclipse.core.resources.ResourcesPlugin;

import org.eclipse.core.runtime.CoreException;

import org.eclipse.core.runtime.Path;

import org.eclipse.jface.viewers.DecoratingLabelProvider;

import org.eclipse.jface.viewers.ISelection;

import org.eclipse.jface.viewers.ISelectionChangedListener;

import org.eclipse.jface.viewers.IStructuredSelection;

import org.eclipse.jface.viewers.ITreeContentProvider;

import org.eclipse.jface.viewers.SelectionChangedEvent;

import org.eclipse.jface.viewers.StructuredSelection;

import org.eclipse.jface.viewers.TreeSelection;

import org.eclipse.jface.viewers.TreeViewer;

import org.eclipse.jface.viewers.Viewer;

import org.eclipse.jface.wizard.WizardDialog;

import org.eclipse.swt.SWT;

import org.eclipse.swt.events.ModifyEvent;

import org.eclipse.swt.events.ModifyListener;

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.Label;

import org.eclipse.swt.widgets.Text;

import org.eclipse.ui.IViewSite;

import org.eclipse.ui.IWorkbenchWizard;

import org.eclipse.ui.PlatformUI;

import org.eclipse.ui.model.WorkbenchContentProvider;

import org.eclipse.ui.model.WorkbenchLabelProvider;

import org.eclipse.ui.wizards.newresource.BasicNewProjectResourceWizard;

import com.nokia.carbide.cpp.internal.pi.wizards.ui.util.CarbidePiWizardHelpIds;

public class NewPIWizardPageOutputTask extends NewPIWizardPage implements INewPIWizardSettings {

	private final static String DOT_NPI= ".npi"; //$NON-NLS-1$

	private final static String EMPTY_STRING = ""; //$NON-NLS-1$

	// Provides all folder in workspace

	private class ProjectContentProvider

	extends WorkbenchContentProvider

	implements ITreeContentProvider

	{

		// local version just to prevent getChildren/hadChild stuck

		// calling each other

		private Object[] localGetChildren(Object arg0) {

			ArrayList<Object> returnList = new ArrayList<Object>();

			Object[] children = super.getChildren(arg0);

			for (Object child: children) {

				if (child instanceof IViewSite || 

					child instanceof IWorkspaceRoot || 

					child instanceof IFolder)

				{

					returnList.add(child);

				} else if (child instanceof IProject) {

					if (((IProject)child).isOpen()) {

						returnList.add(child);

					}

				}

			}

			return returnList.toArray(new Object[returnList.size()]);

		}

		public Object[] getChildren(Object arg0) {

			return localGetChildren(arg0);

		}

		public Object getParent(Object arg0) {

			return super.getParent(arg0);

		}

		public boolean hasChildren(Object arg0) {

			if (localGetChildren(arg0).length > 0) {

				return true;

			}

			return false;

		}

		public Object[] getElements(Object arg0) {

			return super.getElements(arg0);

		}

		public void dispose() {

			super.dispose();

		}

		public void inputChanged(Viewer arg0, Object arg1, Object arg2) {

			super.inputChanged(arg0, arg1, arg2);

		}

	}

	// control

	private Composite composite = null;

	private Composite projectComposite = null;

	private Composite buttonComposite = null;

	private TreeViewer outputChooserTreeViewer = null;

	private Button createButton = null;

	private Label fileLabel = null;

	private Text outputText = null;

	protected NewPIWizardPageOutputTask() {

		super(""); //$NON-NLS-1$

		setTitle(Messages.getString("NewPIWizardPageOutputTask.output.file.and.project")); //$NON-NLS-1$

	    setDescription(Messages.getString("NewPIWizardPageOutputTask.select.folder.or.create.new.project.as.output.file.container")); //$NON-NLS-1$

	}

	public void validatePage() {

		if (outputText.getText().length() < 1 || outputChooserTreeViewer.getTree().getSelection().length < 1) {

			setErrorMessage(Messages.getString("NewPIWizardPageOutputTask.choose.output.project")); //$NON-NLS-1$

			setPageComplete(false);

			return;

		}

		setErrorMessage(null);

		setPageComplete(true);

		return;

	}

	public void createControl(Composite parent) {

		super.createControl(parent);

		GridLayout gridLayout1 = new GridLayout();

		gridLayout1.numColumns = 1;

		composite = new Composite(parent, SWT.NONE);

		composite.setLayout(gridLayout1);

		composite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

		createProjectComposite();

		fileLabel = new Label (composite, SWT.NONE);

		fileLabel.setText(Messages.getString("NewPIWizardPageOutputTask.output.file.name")); //$NON-NLS-1$

		outputText = new Text(composite, SWT.BORDER);

		outputText.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));

		outputText.addSelectionListener(new SelectionListener () {

			public void widgetDefaultSelected(SelectionEvent arg0) {

			}

			public void widgetSelected(SelectionEvent arg0) {

				validatePage();

			}	

		});

		outputText.addModifyListener(new ModifyListener() {

			public void modifyText(ModifyEvent arg0) {

				NewPIWizardSettings.getInstance().piFileName = outputText.getText();		

				NewPIWizardSettings.getInstance().piFileNameModifiedNanoTime = System.nanoTime();

			}

		});

		validatePage();

		setControl(composite);

		PlatformUI.getWorkbench().getHelpSystem().setHelp(getControl(), CarbidePiWizardHelpIds.PI_IMPORT_WIZARD_OUTPUT);		

	}

	/**

	 * This method initializes projectComposite	

	 *

	 */

	private void createProjectComposite() {

		GridLayout gridLayout2 = new GridLayout();

		gridLayout2.numColumns = 2;

		projectComposite = new Composite(composite, SWT.NONE);

		projectComposite.setLayout(gridLayout2);

		projectComposite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

		outputChooserTreeViewer = new TreeViewer(projectComposite, SWT.BORDER);

		outputChooserTreeViewer.getControl().setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

		outputChooserTreeViewer.setContentProvider(new ProjectContentProvider());

		outputChooserTreeViewer.setLabelProvider(new DecoratingLabelProvider(

								new WorkbenchLabelProvider(), 

								PlatformUI.getWorkbench().getDecoratorManager().getLabelDecorator()));

		outputChooserTreeViewer.setInput(ResourcesPlugin.getWorkspace().getRoot());

		outputChooserTreeViewer.getTree().addSelectionListener(new SelectionListener() {

			public void widgetDefaultSelected(SelectionEvent arg0) {

			}

			public void widgetSelected(SelectionEvent arg0) {

				outputText.setText(generateNpiFileName(outputText.getText()));

				validatePage();

			}

		});

		outputChooserTreeViewer.addSelectionChangedListener(new ISelectionChangedListener() {

			public void selectionChanged(SelectionChangedEvent arg0) {

				TreeSelection selection = (TreeSelection) outputChooserTreeViewer.getSelection();

				if (selection != null) {

					Object selected = selection.getFirstElement();

					if (selected != null) {

						if (selected instanceof IContainer) {

							NewPIWizardSettings.getInstance().outputContainer = (IContainer) selected;

						}

					}

				}

			}

		});

		createButtonComposite();

	}

	private void createButtonComposite() {

		GridLayout gridLayout = new GridLayout();

		gridLayout.numColumns = 1;

		buttonComposite = new Composite(projectComposite, SWT.NONE);

		buttonComposite.setLayout(gridLayout);

		buttonComposite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, false, true));

		createButton = new Button(buttonComposite, SWT.PUSH);

		createButton.setText(Messages.getString("NewPIWizardPageOutputTask.create.empty.project")); //$NON-NLS-1$

		createButton.addSelectionListener(new SelectionListener() {

			public void widgetDefaultSelected(SelectionEvent arg0) {

			}

			public void widgetSelected(SelectionEvent arg0) {

				// get a standard Eclipse Wizard for creating folder

				IWorkbenchWizard wizard = new BasicNewProjectResourceWizard();

				wizard.init(PlatformUI.getWorkbench(), new TreeSelection());

				WizardDialog dialog = new WizardDialog(getShell(), wizard);

				dialog.open();

				if (outputChooserTreeViewer.getTree().getItemCount() == 1) {

					outputText.setText(generateNpiFileName(outputText.getText()));

					validatePage();

				}

			}

		});

	}

	private boolean isPositiveLong(String x) {

		try {

			if (Long.parseLong(x) >= 0) {

				return true;

			}

		} catch (NumberFormatException e) {

			return false;

		}

		return false;

	}

	private String generateNpiFileName(String initialFilename) {

		// First look for the container

		IContainer container = NewPIWizardSettings.getInstance().outputContainer;

		TreeSelection selection = (TreeSelection) outputChooserTreeViewer.getSelection();

		if (selection == null)

			return EMPTY_STRING;

		if (selection.getFirstElement() == null)

			return EMPTY_STRING;

		if ((selection.getFirstElement() instanceof IContainer) == false)

			return EMPTY_STRING;

		container = (IContainer) selection.getFirstElement();				

		try {

			// in case user dump a file of the same name without telling eclipse

			container.refreshLocal(1, null);

		} catch (CoreException e) {

			// this is likely harmless

			e.printStackTrace();

		}

		// Then see if we find a matching file name

		initialFilename.trim();

		if (initialFilename.length()==0) {

			// generate from sample file if input file is empty

			initialFilename = NewPIWizardSettings.getInstance().sampleFileName;

		}

		// get just the file name(last part)

		initialFilename = new java.io.File(initialFilename).getName();

		String baseName;

		Long suffixNumber = new Long(0);

		int dot = initialFilename.lastIndexOf("."); //$NON-NLS-1$

		if (dot > 1) {

			baseName = initialFilename.substring(0, dot); //$NON-NLS-1$

		} else {

			baseName = initialFilename;

		}

		if (initialFilename.endsWith(".npi")) {	//$NON-NLS-1$

			// the input is a .npi doesn't exist in container, user should have manually typed it

			if (container.getFile(new Path(initialFilename)).exists() == false) {

				return initialFilename;

			}

			// this is probably an ***_<number>.npi we need to increament

			// just suffix _<number> if the name was derived from input sample name

			if (baseName.lastIndexOf("_") > 1 && 	//$NON-NLS-1$

				isPositiveLong(baseName.substring(baseName.lastIndexOf("_") + 1)))	//$NON-NLS-1$

			{

				suffixNumber = Long.parseLong(baseName.substring(baseName.lastIndexOf("_") + 1)); //$NON-NLS-1$

				baseName = baseName.substring(0, baseName.lastIndexOf("_"));	//$NON-NLS-1$

			}

		}

		// check existing npi and bump number

		while (container.getFile(new Path(baseName + "_" + suffixNumber.toString() + DOT_NPI)).exists()) { //$NON-NLS-1$

			suffixNumber++;

		}

		return baseName + "_" + suffixNumber.toString() + DOT_NPI; //$NON-NLS-1$

	}

	public void setupPageFromFromNewPIWizardSettings() {

		outputChooserTreeViewer.getTree().deselectAll();

		if (NewPIWizardSettings.getInstance().outputContainer == null || 

				NewPIWizardSettings.getInstance().outputContainer.exists() == false ||

				outputChooserTreeViewer.getSelection() == null ||

				outputChooserTreeViewer.getSelection().isEmpty()) {

			// stupid eclipse guideline for default container when we found out how to do it

			NewPIWizardSettings.getInstance().outputContainer = findDefaultContainer();

		}

		if (NewPIWizardSettings.getInstance().outputContainer == null ) {

			// select it if it's the only one output project

			if (outputChooserTreeViewer.getTree().getItemCount() == 1) {

				outputChooserTreeViewer.setSelection(new StructuredSelection(outputChooserTreeViewer.getTree().getItem(0)));

			}

		} else {

			// highlight all items select by expanding to that level

			// restoring from file system persist data could use this

			outputChooserTreeViewer.expandToLevel(NewPIWizardSettings.getInstance().outputContainer, 0);

			outputChooserTreeViewer.setSelection(new StructuredSelection(NewPIWizardSettings.getInstance().outputContainer));

		}

		// setup using last session persisted. If user changed input file, 

		// regenerateOutputIfIntputChanged() will derive the new output name base on input 

		// upon finish, or output page become visible

		outputText.setText(generateNpiFileName(NewPIWizardSettings.getInstance().piFileName));

		validatePage();

	}

	private IContainer findDefaultContainer() {

		IContainer result = null;

		ISelection selection = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getSelectionService().getSelection();

		if (selection instanceof IStructuredSelection) {

			IStructuredSelection structuredSelection = (IStructuredSelection) selection;

			Object firstElement = structuredSelection.getFirstElement();

			if (firstElement instanceof IFile) {

				result = ((IFile)firstElement).getParent();

			} else if (firstElement instanceof IContainer) {

				result = (IContainer) firstElement;

			}

		}

		if (result == null) {

			try {

				IResource[] resources = ResourcesPlugin.getWorkspace().getRoot().members();

				for (IResource resource : resources) {

					if (resource instanceof IContainer) {

						result = (IContainer) resource;

						break;

					}

				}

			} catch (CoreException e) {

				e.printStackTrace();

			}

		}

		return result;

	}

	public void regenerateOutputIfIntputChanged() {

		// if both time stamps are set and input sample is later than NPI, regenerate it

		if (NewPIWizardSettings.getInstance().sampleFileNameModifiedNanoTime != 0 &&

			NewPIWizardSettings.getInstance().piFileNameModifiedNanoTime != 0 &&

			NewPIWizardSettings.getInstance().sampleFileNameModifiedNanoTime - NewPIWizardSettings.getInstance().piFileNameModifiedNanoTime > 0) {

			outputText.setText(generateNpiFileName(NewPIWizardSettings.getInstance().sampleFileName));

		}

	}

	public void setVisible(boolean visable) {

		super.setVisible(visable);

		if (visable) {

			// see if we input changed

			regenerateOutputIfIntputChanged();

			validatePage();

		}

	}

}