/*******************************************************************************
 * Copyright (c) 2013 Intel Corporation.
 * 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:
 * Intel - initial API and implementation
 * Ioana Grigoropol (Intel) - adapt class for remote support
 *******************************************************************************/
package org.yocto.bc.ui.wizards.install;

import java.io.IOException;
import java.io.File;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IProjectDescription;
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.IStatus;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.ptp.rdt.ui.wizards.RemoteProjectContentsLocationArea;
import org.eclipse.ptp.rdt.ui.wizards.RemoteProjectContentsLocationArea.IErrorMessageReporter;
import org.eclipse.ptp.remote.core.IRemoteConnection;
import org.eclipse.ptp.internal.remote.rse.core.RSEConnection;
import org.eclipse.rse.core.model.IHost;
import org.eclipse.rse.services.files.IFileService;
import org.eclipse.rse.services.files.IHostFile;
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.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.DirectoryDialog;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Text;
import org.eclipse.ui.PlatformUI;

import org.yocto.bc.ui.wizards.FiniteStateWizard;
import org.yocto.bc.ui.wizards.FiniteStateWizardPage;
import org.yocto.bc.ui.wizards.FiniteStateWizardPage.ValidationListener;
import org.yocto.remote.utils.RemoteHelper;

/**
 * Select which flavor of OE is to be installed.
 * 
 * @author kgilmer
 * 
 * Setting up the parameters for creating the new Yocto Bitbake project
 * 
 * @modified jzhang
 */
public class OptionsPage extends FiniteStateWizardPage {

	public static final String URI_SEPARATOR = "/";
	public static final String LOCALHOST = "LOCALHOST";

	private Composite top;

	private RemoteProjectContentsLocationArea locationArea;

	private ValidationListener validationListener;
	private Text txtProjectName;
	private Button btnGit;

	protected OptionsPage(Map model) {
		super("Options", model);
		//setTitle("Create new yocto bitbake project");
		setMessage("Enter these parameters to create new Yocto Project BitBake commander project");
	}

	@Override
	public void createControl(Composite parent) {
		top = new Composite(parent, SWT.None);
		top.setLayout(new GridLayout());
		top.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));

		GridData gdFillH = new GridData(GridData.FILL_HORIZONTAL);

		Composite projectNameComp = new Composite(top, SWT.NONE);
		GridData gdProjName = new GridData(GridData.FILL_HORIZONTAL);
		projectNameComp.setLayoutData(gdProjName);
		projectNameComp.setLayout(new GridLayout(2, false));
		Label lblProjectName = new Label(projectNameComp, SWT.NONE);
		lblProjectName.setText("Project N&ame:");

		txtProjectName = new Text(projectNameComp, SWT.BORDER);
		txtProjectName.setLayoutData(gdFillH);
		txtProjectName.setFocus();
		validationListener = new ValidationListener();
		
		txtProjectName.addModifyListener(validationListener);

		IErrorMessageReporter errorReporter = new IErrorMessageReporter() {

			@Override
			public void reportError(String errorMessage, boolean infoOnly) {
				setMessage(errorMessage);
				if (validatePage()) {
	                updateModel();
	                setPageComplete(true);
	                return;
	            }

	            setPageComplete(false);
			}
		};

		locationArea = new RemoteProjectContentsLocationArea(errorReporter, top, null);

		btnGit = new Button(top, SWT.CHECK);
		btnGit.setText("Clone from Yocto Project &Git Repository into new location");
		btnGit.setEnabled(true);
		btnGit.setSelection(true);
		btnGit.addSelectionListener(validationListener);
		GridData gd = new GridData(GridData.VERTICAL_ALIGN_END | GridData.FILL_HORIZONTAL);
		btnGit.setLayoutData(gd);

		setControl(top);
	}

	@Override
	public void pageCleanup() {

	}

	@Override
	public void pageDisplay() {
	}

	@Override
	
	protected void updateModel() {
		try {
			URI uri = getProjectLocationURI();
			if (uri != null)
				model.put(InstallWizard.INSTALL_DIRECTORY, getProjectLocationURI());
		} catch (Exception e){
			e.printStackTrace();
		}
		model.put(InstallWizard.PROJECT_NAME, txtProjectName.getText());
		model.put(InstallWizard.GIT_CLONE, new Boolean(btnGit.getSelection()));
		model.put(InstallWizard.SELECTED_CONNECTION, locationArea.getRemoteConnection());
		model.put(InstallWizard.SELECTED_REMOTE_SERVICE, locationArea.getRemoteServices());
	}

	public URI getProjectLocationURI() throws URISyntaxException {
		URI uri = locationArea.getProjectLocationURI();

		if (uri != null) {
			String location = locationArea.getProjectLocation();
			if (!uri.getPath().isEmpty()) {
				String separator = uri.getPath().endsWith(URI_SEPARATOR) ? "" : URI_SEPARATOR;

				return new URI( uri.getScheme(),
								uri.getHost(),
								uri.getPath() + separator + txtProjectName.getText(),
								uri.getFragment());
			} else {
				return null;
			}
		} else {
			String location = locationArea.getProjectLocation();
			String separator = location.endsWith(URI_SEPARATOR) ? "" : URI_SEPARATOR;

			IRemoteConnection conn = locationArea.getConnection();
			if (conn instanceof RSEConnection) {
				RSEConnection rseConn = (RSEConnection)conn;
				return new URI("rse", rseConn.getHost().getHostName(), location);
			} else {
				return new URI( "file", location + separator + txtProjectName.getText(),"");
			}
		}
	}

	private boolean isValidProjectName(String projectName) {
		if (projectName.indexOf('$') > -1) {
			return false;
		}

		return true;
	}

	private boolean validateProjectName() {
		IWorkspaceRoot wsroot = ResourcesPlugin.getWorkspace().getRoot();

		IStatus validate = ResourcesPlugin.getWorkspace().validateName(txtProjectName.getText(), IResource.PROJECT);

		if (txtProjectName.getText().trim().isEmpty()) {
			setErrorMessage("Project name cannot be empty!");
			return false;
		}

		if (!validate.isOK() || !isValidProjectName(txtProjectName.getText())) {
			setErrorMessage("Invalid project name: " + txtProjectName.getText());
			return false;
		}

		IProject proj = wsroot.getProject(txtProjectName.getText());
		if (proj.exists()) {
			setErrorMessage("A project with the name " + txtProjectName.getText() + " already exists");
			return false;
		}
		return true;
	}
	private String convertToRealPath(String path) {
	    String patternStr = File.separator + File.separator;
	    if (patternStr.equals(URI_SEPARATOR))
	        return path;
	    String replaceStr = URI_SEPARATOR;
	    String convertedpath;

	    //Compile regular expression
	    Pattern pattern = Pattern.compile(patternStr); //pattern to look for

	    //replace all occurance of percentage character to file separator
	    Matcher matcher = pattern.matcher(path);
	    convertedpath = matcher.replaceAll(replaceStr);

	    return convertedpath;
	}

	public String getProjectName(){
		return txtProjectName.getText().trim();
	}

	protected boolean validateProjectLocation() {

		String projectLoc = locationArea.getProjectLocation().trim();

		IRemoteConnection remoteConnection = locationArea.getRemoteConnection();
		if (remoteConnection == null)
			return false;

		if (projectLoc.isEmpty())
			return true;

		IHost connection = RemoteHelper.getRemoteConnectionByName(remoteConnection.getName());

		projectLoc = convertToRealPath(projectLoc);
		String separator = projectLoc.endsWith(URI_SEPARATOR) ? "" : URI_SEPARATOR;
		String projectPath = projectLoc + separator + getProjectName();
		IHostFile repoDest = RemoteHelper.getRemoteHostFile(connection, projectPath, new NullProgressMonitor());

		if(!btnGit.getSelection()) {
			if (repoDest == null || !repoDest.exists()) {
				setErrorMessage("Directory " + projectPath + " does not exist, please select git clone.");
				return false;
			}

			IHostFile validationFile = RemoteHelper.getRemoteHostFile(connection, projectPath + URI_SEPARATOR + InstallWizard.VALIDATION_FILE, new NullProgressMonitor());
			if (validationFile == null || !validationFile.exists()) {
				setErrorMessage("Directory " + projectPath + " seems invalid, please use other directory or project name.");
				return false;
			}
		} else { //git clone
			if (repoDest != null && repoDest.exists() && repoDest.isDirectory()) {
				IHostFile[] hostFiles = RemoteHelper.getRemoteDirContent(connection, repoDest.getAbsolutePath(), "", IFileService.FILE_TYPE_FILES_AND_FOLDERS, new NullProgressMonitor());
				if (hostFiles.length != 0) {
					setErrorMessage("Directory " + projectPath + " is not empty, please choose another location.");
					return false;
				}
				IHostFile gitDescr = RemoteHelper.getRemoteHostFile(connection, projectPath + "/.git", new NullProgressMonitor());
				if (gitDescr != null && gitDescr.exists()) {
					setErrorMessage("Directory " + projectPath + " contains a repository, please choose another location or skip cloning the repository.");
					return false;
				}
			}
		}

		try {
			String projName = txtProjectName.getText();
			if (!projName.trim().isEmpty() && validateProjectName()) {
				IWorkspaceRoot wsroot = ResourcesPlugin.getWorkspace().getRoot();
				IProject proj = wsroot.getProject();
				if (proj != null && proj.exists()) {
					setErrorMessage("A project with the name " + projName + " already exists");
					return false;
				}
				URI location = new URI("file:" + URI_SEPARATOR + URI_SEPARATOR + convertToRealPath(projectLoc) + URI_SEPARATOR + txtProjectName.getText());

				IStatus status = ResourcesPlugin.getWorkspace().validateProjectLocationURI(proj, location);
				if (!status.isOK()) {
					setErrorMessage(status.getMessage());
					return false;
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
			setErrorMessage("Run into error while trying to validate entries!");
			return false;
		}

		setErrorMessage(null);
		return true;
	}
	@Override
	protected boolean validatePage() {
		if  (!validateProjectName())
			return false;

		if (!validateProjectLocation())
			return false;

		setErrorMessage(null);
		setMessage("All the entries are valid, press \"Finish\" to start the process, "+
				"this will take a while. Please don't interrupt till there's output in the Yocto Console window...");
		return true;
	}
	
}