package org.nodeclipse.ui.wizards;

import java.net.URI;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IWorkspace;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Path;
import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.wizard.WizardPage;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Text;
import org.eclipse.ui.IWorkingSet;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.dialogs.WorkingSetGroup;
import org.eclipse.ui.internal.ide.IDEWorkbenchMessages;
import org.eclipse.ui.internal.ide.IDEWorkbenchPlugin;
import org.eclipse.ui.internal.ide.IIDEHelpContextIds;
import org.eclipse.ui.internal.ide.dialogs.ProjectContentsLocationArea;
import org.eclipse.ui.internal.ide.dialogs.ProjectContentsLocationArea.IErrorMessageReporter;
import org.nodeclipse.ui.Activator;
import org.nodeclipse.ui.preferences.PreferenceConstants;
import org.nodeclipse.ui.util.Constants;
import org.eclipse.swt.widgets.Button;

/**
 * @author Tomoyuki Inagaki, Paul Verest
 * 
 * 
<pre>
>express -h

  Usage: express [options]

  Options:

    -h, --help          output usage information
    -V, --version       output the version number
    -s, --sessions      add session support
    -e, --ejs           add ejs engine support (defaults to jade)
    -J, --jshtml        add jshtml engine support (defaults to jade)
    -H, --hogan         add hogan.js engine support
    -c, --css `engine`  add stylesheet `engine` support (less|stylus) (defaults to plain css)
    -f, --force         force on non-empty directory
</pre>
*/

@SuppressWarnings("restriction")
public class ExpressProjectWizardPage extends WizardPage {

    // initial value stores
    private String initialProjectFieldValue;

    // widgets
    Text projectNameField;
    Button btnJade;
    Button btnEjs;
    Button btnJshtml;
    Button btnHogan;

    Button btnCss;
    Button btnLess;
    Button btnStylus;
    
    private Listener nameModifyListener = new Listener() {
        public void handleEvent(Event e) {
            setLocationForSelection();
            boolean valid = validatePage();
            setPageComplete(valid);

        }
    };

    private ProjectContentsLocationArea locationArea;

    private WorkingSetGroup workingSetGroup;

    // constants
    private static final int SIZING_TEXT_FIELD_WIDTH = 250;

    /**
     * Creates a new project creation wizard page.
     * 
     * @param pageName
     *            the name of this page
     * @wbp.parser.constructor
     */
    public ExpressProjectWizardPage(String pageName) {
        super(pageName);
        setPageComplete(false);
    }

    /*
     * (non-Javadoc) Method declared on IDialogPage.
     */
    public void createControl(Composite parent) {
        Composite composite = new Composite(parent, SWT.NULL);

        initializeDialogUnits(parent);

        PlatformUI.getWorkbench().getHelpSystem().setHelp(composite, IIDEHelpContextIds.NEW_PROJECT_WIZARD_PAGE);

        composite.setLayout(new GridLayout());
        composite.setLayoutData(new GridData(GridData.FILL_BOTH));

        createProjectNameGroup(composite);
        locationArea = new ProjectContentsLocationArea(getErrorReporter(), composite);
        if (initialProjectFieldValue != null) {
            locationArea.updateProjectName(initialProjectFieldValue);
        }
        createTemplateGroup(composite);
        
        createStylesheetEngineGroup(composite);

        // Scale the button based on the rest of the dialog
        setButtonLayoutData(locationArea.getBrowseButton());

        setPageComplete(validatePage());
        // Show description on opening
        setErrorMessage(null);
        setMessage(null);
        if (!isExpressInstalled()) {
            setErrorMessage("Express is not found. Please install Express and check Preference.");
        }

        setControl(composite);
        Dialog.applyDialogFont(composite);
    }

    private boolean isExpressInstalled() {
        String path = Activator.getDefault().getPreferenceStore().getString(PreferenceConstants.EXPRESS_PATH);
        if (path == null || path.equals("")) {
            return false;
        }

        java.io.File file = new java.io.File(path);
        return file.exists();
    }

    /**
     * Create a working set group for this page. This method can only be called
     * once.
     * 
     * @param composite
     *            the composite in which to create the group
     * @param selection
     *            the current workbench selection
     * @param supportedWorkingSetTypes
     *            an array of working set type IDs that will restrict what types
     *            of working sets can be chosen in this group
     * @return the created group. If this method has been called previously the
     *         original group will be returned.
     * @since 3.4
     */
    public WorkingSetGroup createWorkingSetGroup(Composite composite, IStructuredSelection selection, String[] supportedWorkingSetTypes) {
        if (workingSetGroup != null)
            return workingSetGroup;
        workingSetGroup = new WorkingSetGroup(composite, selection, supportedWorkingSetTypes);
        return workingSetGroup;
    }

    /**
     * Get an error reporter for the receiver.
     * 
     * @return IErrorMessageReporter
     */
    private IErrorMessageReporter getErrorReporter() {
        return new IErrorMessageReporter() {
            /*
             * (non-Javadoc)
             * 
             * @see
             * org.eclipse.ui.internal.ide.dialogs.ProjectContentsLocationArea
             * .IErrorMessageReporter#reportError(java.lang.String)
             */
            public void reportError(String errorMessage, boolean infoOnly) {
                if (infoOnly) {
                    setMessage(errorMessage, IStatus.INFO);
                    setErrorMessage(null);
                } else
                    setErrorMessage(errorMessage);
                boolean valid = errorMessage == null;
                if (valid) {
                    valid = validatePage();
                }

                setPageComplete(valid);
            }
        };
    }

    /**
     * Creates the project name specification controls.
     * 
     * @param parent
     *            the parent composite
     */
    private final void createProjectNameGroup(Composite parent) {
        // project specification group
        Composite projectGroup = new Composite(parent, SWT.NONE);
        GridLayout layout = new GridLayout();
        layout.numColumns = 2;
        projectGroup.setLayout(layout);
        projectGroup.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));

        // new project label
        Label projectLabel = new Label(projectGroup, SWT.NONE);
        projectLabel.setText(IDEWorkbenchMessages.WizardNewProjectCreationPage_nameLabel);
        projectLabel.setFont(parent.getFont());

        // new project name entry field
        projectNameField = new Text(projectGroup, SWT.BORDER);
        GridData data = new GridData(GridData.FILL_HORIZONTAL);
        data.widthHint = SIZING_TEXT_FIELD_WIDTH;
        projectNameField.setLayoutData(data);
        projectNameField.setFont(parent.getFont());

        // Set the initial value first before listener
        // to avoid handling an event during the creation.
        if (initialProjectFieldValue != null) {
            projectNameField.setText(initialProjectFieldValue);
        }
        projectNameField.addListener(SWT.Modify, nameModifyListener);
    }

    private final void createTemplateGroup(Composite parent) {
        Composite templateGroup = new Composite(parent, SWT.NONE);
        GridLayout layout = new GridLayout();
        layout.numColumns = 5;
        templateGroup.setLayout(layout);
        templateGroup.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));

        Label lblTemplateEngine = new Label(templateGroup, SWT.NONE);
        lblTemplateEngine.setText("Template Engine:");

        btnJade = new Button(templateGroup, SWT.RADIO);
        btnJade.setSelection(true);
        btnJade.setText("Jade");

        btnEjs = new Button(templateGroup, SWT.RADIO);
        btnEjs.setText("ejs");

        btnJshtml = new Button(templateGroup, SWT.RADIO);
        btnJshtml.setText("jshtml");

        btnHogan = new Button(templateGroup, SWT.RADIO);
        btnHogan.setText("hogan.js");
    }

    private final void createStylesheetEngineGroup(Composite parent) {
        Composite stylesheetEngineGroup = new Composite(parent, SWT.NONE);
        GridLayout layout = new GridLayout();
        layout.numColumns = 5;
        stylesheetEngineGroup.setLayout(layout);
        stylesheetEngineGroup.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));

        Label lblTemplateEngine = new Label(stylesheetEngineGroup, SWT.NONE);
        lblTemplateEngine.setText("Stylesheet Engine:");

        btnCss = new Button(stylesheetEngineGroup, SWT.RADIO);
        btnCss.setSelection(true);
        btnCss.setText("CSS");

        btnLess = new Button(stylesheetEngineGroup, SWT.RADIO);
        btnLess.setText("LESS");

        btnStylus = new Button(stylesheetEngineGroup, SWT.RADIO);
        btnStylus.setText("Stylus");
    }
    
    /**
     * Returns the current project location path as entered by the user, or its
     * anticipated initial value. Note that if the default has been returned the
     * path in a project description used to create a project should not be set.
     * 
     * @return the project location path or its anticipated initial value.
     */
    public IPath getLocationPath() {
        return new Path(locationArea.getProjectLocation());
    }

    /**
     * /** Returns the current project location URI as entered by the user, or
     * <code>null</code> if a valid project location has not been entered.
     * 
     * @return the project location URI, or <code>null</code>
     * @since 3.2
     */
    public URI getLocationURI() {
        return locationArea.getProjectLocationURI();
    }

    /**
     * Creates a project resource handle for the current project name field
     * value. The project handle is created relative to the workspace root.
     * <p>
     * This method does not create the project resource; this is the
     * responsibility of <code>IProject::create</code> invoked by the new
     * project resource wizard.
     * </p>
     * 
     * @return the new project resource handle
     */
    public IProject getProjectHandle() {
        return ResourcesPlugin.getWorkspace().getRoot().getProject(getProjectName());
    }

    /**
     * Returns the current project name as entered by the user, or its
     * anticipated initial value.
     * 
     * @return the project name, its anticipated initial value, or
     *         <code>null</code> if no project name is known
     */
    public String getProjectName() {
        if (projectNameField == null) {
            return initialProjectFieldValue;
        }

        return getProjectNameFieldValue();
    }

    /**
     * Returns the value of the project name field with leading and trailing
     * spaces removed.
     * 
     * @return the project name in the field
     */
    private String getProjectNameFieldValue() {
        if (projectNameField == null) {
            return ""; //$NON-NLS-1$
        }

        return projectNameField.getText().trim();
    }

    /**
     * Sets the initial project name that this page will use when created. The
     * name is ignored if the createControl(Composite) method has already been
     * called. Leading and trailing spaces in the name are ignored. Providing
     * the name of an existing project will not necessarily cause the wizard to
     * warn the user. Callers of this method should first check if the project
     * name passed already exists in the workspace.
     * 
     * @param name
     *            initial project name for this page
     * 
     * @see IWorkspace#validateName(String, int)
     * 
     */
    public void setInitialProjectName(String name) {
        if (name == null) {
            initialProjectFieldValue = null;
        } else {
            initialProjectFieldValue = name.trim();
            if (locationArea != null) {
                locationArea.updateProjectName(name.trim());
            }
        }
    }

    /**
     * Set the location to the default location if we are set to useDefaults.
     */
    void setLocationForSelection() {
        locationArea.updateProjectName(getProjectNameFieldValue());
    }

    /**
     * Returns whether this page's controls currently all contain valid values.
     * 
     * @return <code>true</code> if all controls are valid, and
     *         <code>false</code> if at least one is invalid
     */
    protected boolean validatePage() {
        IWorkspace workspace = IDEWorkbenchPlugin.getPluginWorkspace();

        String projectFieldContents = getProjectNameFieldValue();
        if (projectFieldContents.equals("")) { //$NON-NLS-1$
            setErrorMessage(null);
            setMessage(IDEWorkbenchMessages.WizardNewProjectCreationPage_projectNameEmpty);
            return false;
        }

        IStatus nameStatus = workspace.validateName(projectFieldContents, IResource.PROJECT);
        if (!nameStatus.isOK()) {
            setErrorMessage(nameStatus.getMessage());
            return false;
        }

        IProject handle = getProjectHandle();
        if (handle.exists()) {
            setErrorMessage(IDEWorkbenchMessages.WizardNewProjectCreationPage_projectExistsMessage);
            return false;
        }

        IProject project = ResourcesPlugin.getWorkspace().getRoot().getProject(getProjectNameFieldValue());
        locationArea.setExistingProject(project);

        String validLocationMessage = locationArea.checkValidLocation();
        if (validLocationMessage != null) {
            // there is no destination location given
            setErrorMessage(validLocationMessage);
            return false;
        }

        setErrorMessage(null);
        setMessage(null);
        return true;
    }

    /*
     * see @DialogPage.setVisible(boolean)
     */
    public void setVisible(boolean visible) {
        super.setVisible(visible);
        if (visible) {
            projectNameField.setFocus();
        }
    }

    /**
     * Returns the useDefaults.
     * 
     * @return boolean
     */
    public boolean useDefaults() {
        return locationArea.isDefault();
    }

    /**
     * Return the selected working sets, if any. If this page is not configured
     * to interact with working sets this will be an empty array.
     * 
     * @return the selected working sets
     * @since 3.4
     */
    public IWorkingSet[] getSelectedWorkingSets() {
        return workingSetGroup == null ? new IWorkingSet[0] : workingSetGroup.getSelectedWorkingSets();
    }

    public String getSelectedTemplateEngine() {
        if (btnEjs.getSelection()) {
            return Constants.TEMPLATE_ENGINE_EJS;
        }
        if (btnJshtml.getSelection()) {
            return Constants.TEMPLATE_ENGINE_JSHTML;
        }
        if (btnHogan.getSelection()) {
            return Constants.TEMPLATE_ENGINE_HOGAN;
        }
        return Constants.BLANK_STRING;
    }
    
    public String getSelectedStylesheetEngine() {
        if (btnLess.getSelection()) {
            return Constants.STYLESHEET_LESS;
        }
        if (btnStylus.getSelection()) {
            return Constants.STYLESHEET_STYLUS;
        }
        return Constants.STYLESHEET_CSS;
    }
}

