/*
 * 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.save;

import java.util.ArrayList;

import org.eclipse.core.resources.IContainer;
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.IPath;
import org.eclipse.core.runtime.Path;
import org.eclipse.jface.dialogs.IDialogPage;
import org.eclipse.jface.viewers.DecoratingLabelProvider;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.ITreeContentProvider;
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.jface.wizard.WizardPage;
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.pi.ComNokiaCarbidePiHelpIDs;

/**
 * The SaveTableWizardPage wizard page allows setting the containing workspace folder
 * for the saved table data as well as the file name. The page will only accept file
 * name without the extension OR with the extension .csv.
 */

public class SaveTableWizardPage extends WizardPage {

	// Provides all folders in the workspace
	private class ProjectContentProvider
	extends WorkbenchContentProvider
	implements ITreeContentProvider
	{
		// local version just to prevent getChildren/hadChild getting 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);
		}
	}

//	private Text containerText;

	private Text fileText;

	private ISelection selection;
	
	private TreeViewer outputChooserTreeViewer;

	/**
	 * Constructor for SampleNewWizardPage.
	 * 
	 * @param pageName
	 */
	public SaveTableWizardPage(ISelection selection) {
		super("wizardPage"); //$NON-NLS-1$
		setTitle(Messages.getString("SaveTableWizardPage.CVSFileForTableData")); //$NON-NLS-1$
		setDescription(Messages.getString("SaveTableWizardPage.SpecifyFileWithCSVExtension")); //$NON-NLS-1$
		this.selection = selection;
	}

	/**
	 * @see IDialogPage#createControl(Composite)
	 */
	public void createControl(Composite parent) {
		Composite container = new Composite(parent, SWT.NULL);
		GridLayout layout = new GridLayout();
		container.setLayout(layout);
		layout.numColumns = 1;
//		layout.verticalSpacing = 9;

		PlatformUI.getWorkbench().getHelpSystem().setHelp(container, ComNokiaCarbidePiHelpIDs.PI_SAVE_TABLE_WIZARD_PAGE);
		createProjectComposite(container);
		GridData gd;

		Label fileLabel = new Label(container, SWT.NONE);
		fileLabel.setText(Messages.getString("SaveTableWizardPage.OutputFileName")); //$NON-NLS-1$
		fileText = new Text(container, SWT.BORDER | SWT.SINGLE);
		gd = new GridData(GridData.FILL_HORIZONTAL);
		fileText.setLayoutData(gd);
		fileText.addModifyListener(new ModifyListener() {
			public void modifyText(ModifyEvent e) {
				dialogChanged();
			}
		});

		initialize();
		dialogChanged();
		setControl(container);
	}

	/**
	 * Tests if the current workbench selection is a suitable container to use.
	 */

	private void initialize() {
		if (selection != null && selection.isEmpty() == false
				&& selection instanceof IStructuredSelection) {
			IStructuredSelection ssel = (IStructuredSelection) selection;
			if (ssel.size() > 1)
				return;
			Object obj = ssel.getFirstElement();
			if (obj instanceof IResource) {
				IContainer container;
				if (obj instanceof IContainer)
					container = (IContainer) obj;
				else
					container = ((IResource) obj).getParent();
//				containerText.setText(container.getFullPath().toString());
			}
		}
		fileText.setText("new_file.csv"); //$NON-NLS-1$
	}

	/**
	 * Ensures that both text fields are set.
	 */

	private void dialogChanged() {
//		IResource container = ResourcesPlugin.getWorkspace().getRoot()
//				.findMember(new Path(getContainerName()));
		String fileName = getFileName();

		if (outputChooserTreeViewer.getTree().getSelection().length < 1) {
//		if (getContainerName().length() == 0) {
			updateStatus(ERROR, Messages.getString("SaveTableWizardPage.ProjectFolderRequired")); //$NON-NLS-1$
			return;
		}
//		if (container == null
//				|| (container.getType() & (IResource.PROJECT | IResource.FOLDER)) == 0) {
//			updateStatus("File container must exist");
//			return;
//		}
//		if (!container.isAccessible()) {
//			updateStatus("Project must be writable");
//			return;
//		}
		if (fileName.length() == 0) {
			updateStatus(ERROR, Messages.getString("SaveTableWizardPage.FileNameRequired")); //$NON-NLS-1$
			return;
		}
		if (fileName.replace('\\', '/').indexOf('/', 1) > 0) {
			updateStatus(ERROR, Messages.getString("SaveTableWizardPage.FileNameMustBeValid")); //$NON-NLS-1$
			return;
		}
		int dotLoc = fileName.lastIndexOf('.');
		if (dotLoc != -1) {
			String ext = fileName.substring(dotLoc + 1);
			if (ext.equalsIgnoreCase("csv") == false) { //$NON-NLS-1$
				updateStatus(ERROR, Messages.getString("SaveTableWizardPage.FileExtensionMustBeCSV")); //$NON-NLS-1$
				return;
			}
		}
		
		TreeSelection selection = (TreeSelection) outputChooserTreeViewer.getSelection();
		if (   (selection != null)
			&& (selection.getFirstElement() != null)
			&& (selection.getFirstElement() instanceof IContainer)) {
			IContainer container = (IContainer) selection.getFirstElement();
			String file = fileName;
			
			if (dotLoc == -1)
			{
				file += ".csv"; //$NON-NLS-1$
			}
			if (container.getFile(new Path(file)).exists()) {
				updateStatus(WARNING, Messages.getString("SaveTableWizardPage.WarningFileExists")); //$NON-NLS-1$
				return;
			}
		}

		updateStatus(WARNING, null);
	}

	private void updateStatus(int messageType, String message) {
		setMessage(message, messageType);
		setPageComplete(messageType != ERROR);
	}

	public IPath getContainerName() {
		
		TreeSelection selection = (TreeSelection) outputChooserTreeViewer.getSelection();
		if (   (selection != null)
			&& (selection.getFirstElement() != null)
			&& (selection.getFirstElement() instanceof IContainer)) {
			IContainer container = (IContainer) selection.getFirstElement();
			return container.getFullPath();
		}
		return null;
	}

	public String getFileName() {
		return fileText.getText();
	}

//	/**
//	 * Uses the standard container selection dialog to choose the new value for
//	 * the container field.
//	 */
//
//	private void handleBrowse() {
//		ContainerSelectionDialog dialog = new ContainerSelectionDialog(
//				getShell(), ResourcesPlugin.getWorkspace().getRoot(), false,
//				"Select new file container");
//		if (dialog.open() == ContainerSelectionDialog.OK) {
//			Object[] result = dialog.getResult();
//			if (result.length == 1) {
//				containerText.setText(((Path) result[0]).toString());
//			}
//		}
//	}

//	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;
//	
//	public boolean validatePage() {
//		// need to enable finish, setPageComplete eventually check global states
////		if (outputText.getText().length() < 1 || outputChooserTreeViewer.getTree().getSelection().length < 1) {
////			setErrorMessage(Messages.getString("NewPIWizardPageOutputTask.choose.output.project")); //$NON-NLS-1$
////			setPageComplete(false);
////			return true;
////		}
////		setErrorMessage(null);
////		setPageComplete(true);
//		return true;
//	}
	
	/**
	 * This method initializes projectComposite	
	 *
	 */
	private void createProjectComposite(Composite container) {
		GridLayout gridLayout2 = new GridLayout();
		gridLayout2.numColumns = 2;
		Composite projectComposite = new Composite(container, 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) {
				dialogChanged();
			}
		});

		createButtonComposite(projectComposite);
	}
	
	private void createButtonComposite(Composite projectComposite) {
		GridLayout gridLayout = new GridLayout();
		gridLayout.numColumns = 1;
		Composite buttonComposite = new Composite(projectComposite, SWT.NONE);
		buttonComposite.setLayout(gridLayout);
		buttonComposite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, false, true));
		Button createButton = new Button(buttonComposite, SWT.PUSH);
		createButton.setText(Messages.getString("SaveTableWizardPage.CreateEmptyProject")); //$NON-NLS-1$
		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) {
					dialogChanged();
				}
			}
		});
	}
//	
//	private String generateNpiFileName() {	
//		// prepare the container folder to look into
//		TreeSelection selection = (TreeSelection) outputChooserTreeViewer.getSelection();
//		if (selection == null)
//			return "";
//		if (selection.getFirstElement() == null)
//			return "";
//		if ((selection.getFirstElement() instanceof IContainer) == false)
//			return "";
//		IContainer container = (IContainer) selection.getFirstElement();
//
//		String sampleFilename = null;//new java.io.File(NewPIWizardSettings.getInstance().sampleFileName).getName();
//		String initialFilename;
//
//		initialFilename = sampleFilename;
//		
//		int dot = initialFilename.lastIndexOf("."); //$NON-NLS-1$
//		String noExtension;
//		String baseName;
//		String finalName;
//		if (dot > 1) {
//			noExtension = initialFilename.substring(0, initialFilename.lastIndexOf(".")); //$NON-NLS-1$
//		} else {
//			noExtension = initialFilename;
//		}
//
//		Long suffixNumber = new Long(0);
//		
//		// just suffix _<number> if the name was derived from input sample name
//		if (noExtension.lastIndexOf("_") > 1 &&		//$NON-NLS-1$
//			initialFilename.equalsIgnoreCase(sampleFilename) == false
//			//&&
////			isPositiveLong(noExtension.substring(noExtension.lastIndexOf("_") + 1))
//			) { //$NON-NLS-1$
//			baseName = noExtension.substring(0, noExtension.lastIndexOf("_"));	//$NON-NLS-1$
////			if (isPositiveLong(noExtension.substring(noExtension.lastIndexOf("_") + 1))) { //$NON-NLS-1$
////				suffixNumber = Long.parseLong(noExtension.substring(noExtension.lastIndexOf("_") + 1)); //$NON-NLS-1$
////			}
//		} else {
//			baseName = noExtension;
//		}
//		
//		// check existing npi and bump number
//		while (container.getFile(new Path(baseName + "_" + suffixNumber.toString() + DOT_CSV)).exists()) { //$NON-NLS-1$
//			suffixNumber++;
//		}
//		
//		finalName = baseName + "_" + suffixNumber.toString() + DOT_CSV; //$NON-NLS-1$
//
//		return finalName;
//	}
//
//	public void setupPageFromFromNewPIWizardSettings() {
//		outputText.setText(SaveTableWizardPage.DOT_CSV);
//		outputChooserTreeViewer.getTree().deselectAll();
//		IContainer outputContainer = null;
//		if (outputChooserTreeViewer.getSelection() == null ||
//			outputChooserTreeViewer.getSelection().isEmpty()) {
//			// stupid eclipse guideline for default container when we found out how to do it
//			outputContainer = findDefaultContainer();
//		}
//		if (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 persistent data could use this
//			outputChooserTreeViewer.expandToLevel(outputContainer, 0);
//			outputChooserTreeViewer.setSelection(new StructuredSelection(outputContainer));
//		}
//	}
//
//	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 writePageDataToNewPIWizardSettings() {
//	}
//
//	public void setVisible(boolean visable) {
//		super.setVisible(visable);
//		if (visable) {
//			outputText.setText(SaveTableWizardPage.DOT_CSV);
//			validatePage();
//		} else {
//		}
//	}
}