/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.drools.workbench.screens.scenariosimulation.webapp.client.popup;

import java.util.Objects;

import javax.enterprise.context.Dependent;

import com.google.gwt.core.client.GWT;
import com.google.gwt.safehtml.shared.SafeHtmlUtils;
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.ui.IsWidget;
import org.gwtbootstrap3.client.ui.Button;
import org.gwtbootstrap3.client.ui.Modal;
import org.gwtbootstrap3.client.ui.ModalBody;
import org.gwtbootstrap3.client.ui.ModalFooter;
import org.gwtbootstrap3.client.ui.constants.Attributes;
import org.gwtbootstrap3.client.ui.constants.ButtonDismiss;
import org.gwtbootstrap3.client.ui.constants.ButtonType;
import org.gwtbootstrap3.client.ui.constants.ModalBackdrop;
import org.uberfire.mvp.Command;

/**
 * A modal dialog that floats above the workbench. Each instance can only be shown once.
 */
@Dependent
public class Bs3Modal extends Modal {

    private final ModalBody body = GWT.create(ModalBody.class);

    /**
     * Used for enforcing the "only show one time" rule.
     */
    boolean hasBeenShown;

    public Bs3Modal() {
        setup();
    }

    protected void setup() {
        this.add(body);
        this.setDataBackdrop(ModalBackdrop.STATIC);
        this.setFade(true);
        this.setRemoveOnHide(true);
        this.getElement().setAttribute(Attributes.ROLE,
                                       "dialog");
        this.getElement().setAttribute(Attributes.TABINDEX,
                                       "-1");
        this.setId(DOM.createUniqueId());
    }

    @Override
    protected void onAttach() {
        super.onAttach();
        initFooter(this.getId());
    }

    private native void initFooter(final String id) /*-{
        var footer = $wnd.jQuery('#' + id + ' .modal-footer');
        if (footer.length == 0) {
            this.@org.drools.workbench.screens.scenariosimulation.webapp.client.popup.Bs3Modal::addDefaultFooter()();
        }
    }-*/;

    /**
     * Shows this modal dialog above the current workbench.
     *
     * @param afterShown  the action to perform once the dialog has been shown. Not null. Use { Commands#DO_NOTHING} if you don't have an "after show" action.
     * @param afterClosed the action to perform once the dialog has been dismissed. Not null. Use { Commands#DO_NOTHING} if you don't have an "after close" action.
     */
    public void show(final Command afterShown,
                     final Command afterClosed) {

        checkNotNull("afterShown", afterShown);
        checkNotNull("afterClosed", afterClosed);
        this.addShownHandler(showEvent -> {
            if (afterShown != null) {
                afterShown.execute();
            }
        });
        this.addHiddenHandler(hiddenEvent -> {
            if (afterClosed != null) {
                afterClosed.execute();
            }
        });
        this.show();
    }

    @Override
    public void show() {
        if (hasBeenShown) {
            throw new IllegalStateException("This modal has already been shown. Create a new instance if you want to show another modal.");
        }
        super.show();
    }

    /**
     * Replaces the contents within the main body area of the modal. By default, the main body area is empty.
     *
     * @param content the new content for the main body area.
     */
    public void setContent(IsWidget content) {
        body.clear();
        body.add(content);
    }

    protected void addDefaultFooter() {
        final Button close = GWT.create(Button.class);
        close.setText("OK");
        close.setDataDismiss(ButtonDismiss.MODAL);
        close.setType(ButtonType.PRIMARY);
        setFooterContent(close);
    }

    public void setModalTitle(final String title) {
        this.setTitle(SafeHtmlUtils.htmlEscape(title));
    }

    /**
     * Replaces the current contents of the footer area with the given widget. By default (if you do not call this
     * method), the footer contains an OK button that dismisses the dialog when clicked.
     *
     * @param content the new content for the footer area.
     */
    public void setFooterContent(IsWidget content) {
        final ModalFooter footer = GWT.create(ModalFooter.class);
        this.add(footer);
        footer.add(content);
    }

    /**
     * Sets the pixel height of the main content container.
     */
    public void setBodyHeight(int height) {
        body.setHeight(height + "px");
    }

    private static <T> T checkNotNull(String objName, T obj) {
        return Objects.requireNonNull(obj, "Parameter named '" + objName + "' should be not null!");
    }
}
