package org.nodeclipse.ui.wizards;

import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.Path;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
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.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.Label;
import org.eclipse.swt.widgets.Text;
import org.eclipse.ui.dialogs.ContainerSelectionDialog;

/**
 * The "New" wizard page allows setting the container for the new file as well
 * as the file name. The page will only accept file name without the extension
 * OR with the extension that matches the expected one (js).
 * 
 * @author Paul Verest
 * @since 0.12 
 */

public class TypeScriptFileWizardPage extends WizardPage {
	
	private static final String PAGE_TITLE = "TypeScript source file";
	private static final String PAGE_DESCRIPTION = "Create a new TypeScript source file.";
	
    private Text containerText;

    private Text fileText;

    private ISelection selection;

    /**
     * Constructor for SampleNewWizardPage.
     * 
     * @param pageName
     */
    public TypeScriptFileWizardPage(ISelection selection) {
        super("TypeScriptFileWizardPage");
        setTitle(PAGE_TITLE);
        setDescription(PAGE_DESCRIPTION);
        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 = 3;
        layout.verticalSpacing = 9;
        Label label = new Label(container, SWT.NULL);
        label.setText("&Container:");

        containerText = new Text(container, SWT.BORDER | SWT.SINGLE);
        GridData gd = new GridData(GridData.FILL_HORIZONTAL);
        containerText.setLayoutData(gd);
        containerText.addModifyListener(new ModifyListener() {
            public void modifyText(ModifyEvent e) {
                dialogChanged();
            }
        });

        Button button = new Button(container, SWT.PUSH);
        button.setText("Browse...");
        button.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent e) {
                handleBrowse();
            }
        });
        label = new Label(container, SWT.NULL);
        label.setText("&File name:");

        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("noname.ts");
        fileText.setSelection(0, "noname".length());
        fileText.setFocus();
    }

    /**
     * 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());
            }
        }
    }

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

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

        if (getContainerName().length() == 0) {
            updateStatus("File container must be specified");
            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("File name must be specified");
            return;
        }
        if (fileName.replace('\\', '/').indexOf('/', 1) > 0) {
            updateStatus("File name must be valid");
            return;
        }
        int dotLoc = fileName.lastIndexOf('.');
        if (dotLoc != -1) {
            String ext = fileName.substring(dotLoc + 1);
            if (ext.equalsIgnoreCase("ts") == false) {
                updateStatus("File extension must be \"ts\"");
                return;
            }
        }
        updateStatus(null);
    }

    private void updateStatus(String message) {
        setErrorMessage(message);
        setPageComplete(message == null);
    }

    public String getContainerName() {
        return containerText.getText();
    }

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