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/*
 * Copyright 2017 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jbpm.designer.client.util;

import javax.enterprise.event.Event;
import javax.inject.Inject;

import com.google.gwt.event.dom.client.BlurEvent;
import com.google.gwt.event.dom.client.BlurHandler;
import com.google.gwt.event.dom.client.KeyCodes;
import com.google.gwt.event.dom.client.KeyPressEvent;
import com.google.gwt.event.dom.client.KeyPressHandler;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import org.gwtbootstrap3.client.ui.TextBox;
import org.uberfire.workbench.events.NotificationEvent;

public abstract class AbstractValidatingTextBox extends TextBox {

    @Inject
    private Event notification;

    public AbstractValidatingTextBox() {
        super();
        setup();
    }

    protected void setup() {
        final TextBox me = this;

        //Validate value as it is entered
        this.addKeyPressHandler(new KeyPressHandler() {

            public void onKeyPress(KeyPressEvent event) {

                // Permit navigation
                int keyCode = getKeyCodeFromKeyPressEvent(event);
                if (event.isControlKeyDown()) {
                    return;
                }
                if (!event.isShiftKeyDown()) {
                    if (keyCode == KeyCodes.KEY_BACKSPACE
                            || keyCode == KeyCodes.KEY_DELETE
                            || keyCode == KeyCodes.KEY_LEFT
                            || keyCode == KeyCodes.KEY_RIGHT
                            || keyCode == KeyCodes.KEY_TAB
                            || keyCode == KeyCodes.KEY_HOME
                            || keyCode == KeyCodes.KEY_END) {
                        return;
                    }
                }

                // Get new value and validate
                int charCode = event.getCharCode();
                String oldValue = me.getValue();
                String newValue = oldValue.substring(0,
                                                     me.getCursorPos());
                newValue = newValue + ((char) charCode);
                newValue = newValue + oldValue.substring(me.getCursorPos() + me.getSelectionLength());
                String validationError = isValidValue(newValue,
                                                      false);
                if (validationError != null) {
                    event.preventDefault();
                    fireValidationError(validationError);
                }
            }
        });

        //Add validation when loses focus (for when values are pasted in by user)
        this.addBlurHandler(new BlurHandler() {

            @Override
            public void onBlur(BlurEvent event) {
                String value = me.getText();
                String validationError = isValidValue(value,
                                                      true);
                if (validationError != null) {
                    fireValidationError(validationError);
                    String validValue = makeValidValue(value);
                    me.setValue(validValue);
                    ValueChangeEvent.fire(AbstractValidatingTextBox.this,
                                          validValue);
                }
            }
        });
    }

    /**
     * Tests whether a value is valid
     * @param value
     * @param isOnFocusLost
     * @return an error message to be reported
     */
    public abstract String isValidValue(final String value,
                                        final boolean isOnFocusLost);

    /**
     * If validation fails (e.g. as a result of a user pasting a value) when the
     * TextBox looses focus this method is called to transform the current value
     * into one which is valid.
     * @param value Current value
     * @return A valid value
     */
    protected abstract String makeValidValue(final String value);

    protected void fireValidationError(String validationError) {
        notification.fire(new NotificationEvent(validationError,
                                                NotificationEvent.NotificationType.ERROR));
    }

    protected int getKeyCodeFromKeyPressEvent(KeyPressEvent event) {
        return event.getNativeEvent().getKeyCode();
    }
}