TestRoots/watchdog

package nl.tudelft.watchdog.eclipse.ui.wizards;

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.Control;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Text;

import nl.tudelft.watchdog.core.logic.network.NetworkUtils;
import nl.tudelft.watchdog.core.logic.network.ServerCommunicationException;
import nl.tudelft.watchdog.eclipse.ui.preferences.Preferences;
import nl.tudelft.watchdog.eclipse.ui.util.UIUtils;

import static nl.tudelft.watchdog.core.ui.wizards.WizardStrings.*;
import static nl.tudelft.watchdog.eclipse.ui.wizards.UserRegistrationPage.ID_LENGTH;

import java.util.function.Consumer;

/**
 * Input panel that has an input field for a WatchDog ID and can
 * verify that the id exists after filling in.
 */
abstract class IdInputPanel extends Composite {

    private Text textfield;
    private Composite statusContainer;

    /**
     * Create the input panel.
     * @param parent The parent container.
     * @param callback The callback invoked after the user clicked "Verify".
     */
    IdInputPanel(Composite parent, Consumer<Boolean> callback) {
        super(parent, SWT.NONE);
        this.setLayout(RegistrationStep.createRowLayout(SWT.VERTICAL));

        Composite fieldContainer = new Composite(this, SWT.NONE);
        fieldContainer.setLayout(new GridLayout(2, false));

        this.textfield = UIUtils.createLinkedFieldInput(this.getIdLabelText(), this.getIdTooltipText(), fieldContainer);
        textfield.setSize(250, SWT.DEFAULT);
        textfield.setTextLimit(ID_LENGTH);
        textfield.setLayoutData(new GridData(350, SWT.DEFAULT));

        Button verify = new Button(fieldContainer, SWT.FLAT);
        verify.setText(VERIFICATION_BUTTON_TEXT);
        verify.setEnabled(false);
        verify.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 2, 1));

        textfield.addModifyListener(new ModifyListener() {
            @Override
            public void modifyText(ModifyEvent e) {
                verify.setEnabled(textfield.getText().length() == ID_LENGTH);
            }
        });

        statusContainer = new Composite(this, SWT.NONE);
        statusContainer.setLayout(RegistrationStep.createRowLayout(SWT.VERTICAL));

        verify.addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(SelectionEvent e) {
                for (Control control : statusContainer.getChildren()) {
                    control.dispose();
                }
                callback.accept(verifyUserIdRegistration());

                statusContainer.layout(true, true);
                parent.layout(true, true);

                parent.redraw();
                parent.update();
            }
        });
    }

    abstract String getIdTooltipText();

    abstract String getIdLabelText();

    abstract String createUrlForId(String text);

    abstract void storeIdInPreferences(Preferences preferences, String id);

    private boolean verifyUserIdRegistration() {
        try {
            NetworkUtils.getURLAndGetResponse(createUrlForId(this.textfield.getText()));
        } catch (ServerCommunicationException exception) {
            new Label(statusContainer, SWT.NONE).setText(VERIFICATION_MESSAGE_FAILURE);
            RegistrationStep.createErrorMessageLabel(statusContainer, exception);

            return false;
        }

        this.storeIdInPreferences(Preferences.getInstance(), this.textfield.getText());

        new Label(statusContainer, SWT.NONE).setText(VERIFICATION_SUCCESSFUL_MESSAGE);
        return true;
    }

}