EDIT

/**

* Copyright (C) 2017 EDIT

* European Distributed Institute of Taxonomy

* http://www.e-taxonomy.eu

*

* The contents of this file are subject to the Mozilla Public License Version 1.1

* See LICENSE.TXT at the top of this package for the full license terms.

*/

package eu.etaxonomy.vaadin.mvp;

import java.util.Map;

import org.apache.log4j.Logger;

import com.vaadin.data.Validator.InvalidValueException;

import com.vaadin.data.fieldgroup.BeanFieldGroup;

import com.vaadin.data.fieldgroup.FieldGroup.CommitEvent;

import com.vaadin.data.fieldgroup.FieldGroup.CommitException;

import com.vaadin.data.fieldgroup.FieldGroup.CommitHandler;

import com.vaadin.data.fieldgroup.FieldGroup.FieldGroupInvalidValueException;

import com.vaadin.server.AbstractErrorMessage.ContentMode;

import com.vaadin.server.ErrorMessage.ErrorLevel;

import com.vaadin.server.FontAwesome;

import com.vaadin.server.UserError;

import com.vaadin.ui.AbstractField;

import com.vaadin.ui.AbstractOrderedLayout;

import com.vaadin.ui.Alignment;

import com.vaadin.ui.Button;

import com.vaadin.ui.CheckBox;

import com.vaadin.ui.Component;

import com.vaadin.ui.Field;

import com.vaadin.ui.GridLayout;

import com.vaadin.ui.GridLayout.OutOfBoundsException;

import com.vaadin.ui.GridLayout.OverlapsException;

import com.vaadin.ui.HorizontalLayout;

import com.vaadin.ui.Layout;

import com.vaadin.ui.Notification;

import com.vaadin.ui.Notification.Type;

import com.vaadin.ui.PopupDateField;

import com.vaadin.ui.TextField;

import com.vaadin.ui.VerticalLayout;

import com.vaadin.ui.themes.ValoTheme;

import eu.etaxonomy.vaadin.ui.view.DoneWithPopupEvent;

import eu.etaxonomy.vaadin.ui.view.DoneWithPopupEvent.Reason;

/**

 * @author a.kohlbecker

 * @since Apr 5, 2017

 *

 */

public abstract class AbstractPopupEditor<DTO extends Object, P extends AbstractEditorPresenter<DTO>>

    extends AbstractPopupView<P> {

    private BeanFieldGroup<DTO> fieldGroup;

    private VerticalLayout mainLayout;

    private Layout fieldLayout;

    private HorizontalLayout buttonLayout;

    private Button save;

    private Button cancel;

    private GridLayout _gridLayoutCache;

    public AbstractPopupEditor(Layout layout, Class<DTO> dtoType) {

        setWidthUndefined();

        mainLayout = new VerticalLayout();

        mainLayout.setWidthUndefined();

        fieldGroup = new BeanFieldGroup<>(dtoType);

        fieldGroup.addCommitHandler(new SaveHandler());

        setCompositionRoot(mainLayout);

        fieldLayout = layout;

        fieldLayout.setWidthUndefined();

        if(fieldLayout instanceof AbstractOrderedLayout){

            ((AbstractOrderedLayout)fieldLayout).setSpacing(true);

        }

        buttonLayout = new HorizontalLayout();

        buttonLayout.setStyleName(ValoTheme.WINDOW_BOTTOM_TOOLBAR);

        buttonLayout.setWidth(100, Unit.PERCENTAGE);

        buttonLayout.setSpacing(true);

        save = new Button("Save", FontAwesome.SAVE);

        save.setStyleName(ValoTheme.BUTTON_PRIMARY);

        save.addClickListener(e -> onSaveClicked());

        cancel = new Button("Cancel", FontAwesome.TRASH);

        cancel.addClickListener(e -> onCancelClicked());

        buttonLayout.addComponents(save, cancel);

        buttonLayout.setExpandRatio(save, 1);

        buttonLayout.setComponentAlignment(save, Alignment.TOP_RIGHT);

        buttonLayout.setComponentAlignment(cancel, Alignment.TOP_RIGHT);

        mainLayout.addComponents(fieldLayout, buttonLayout);

    }

    protected VerticalLayout getMainLayout() {

        return mainLayout;

    }

    protected Layout getFieldLayout() {

        return fieldLayout;

    }

    /**

     * @return

     */

    private GridLayout gridLayout() {

        if(_gridLayoutCache == null){

            if(fieldLayout instanceof GridLayout){

                _gridLayoutCache = (GridLayout)fieldLayout;

            } else {

                throw new RuntimeException("The fieldlayout of this editor is not a GridLayout");

            }

        }

        return _gridLayoutCache;

    }

    @Override

    public void setReadOnly(boolean readOnly) {

        super.setReadOnly(readOnly);

        save.setVisible(!readOnly);

        cancel.setCaption(readOnly ? "Close" : "Cancel");

    }

    // ------------------------ event handler ------------------------ //

    private class SaveHandler implements CommitHandler {

        private static final long serialVersionUID = 2047223089707080659L;

        @Override

        public void preCommit(CommitEvent commitEvent) throws CommitException {

        }

        @Override

        public void postCommit(CommitEvent commitEvent) throws CommitException {

            try {

                // notify the presenter to persist the bean

                eventBus.publishEvent(new EditorSaveEvent(commitEvent));

                // notify the NavigationManagerBean to close the window and to dispose the view

                eventBus.publishEvent(new DoneWithPopupEvent(AbstractPopupEditor.this, Reason.SAVE));

            } catch (Exception e) {

                throw new CommitException("Failed to store data to backend", e);

            }

        }

    }

    protected void addCommitHandler(CommitHandler commitHandler) {

        fieldGroup.addCommitHandler(commitHandler);

    }

    private void onCancelClicked() {

        fieldGroup.discard();

        eventBus.publishEvent(new DoneWithPopupEvent(this, Reason.CANCEL));

    }

    private void onSaveClicked() {

        try {

            fieldGroup.commit();

        } catch (CommitException e) {

            fieldGroup.getFields().forEach(f -> ((AbstractField)f).setValidationVisible(true));

            if(e.getCause() != null && e.getCause() instanceof FieldGroupInvalidValueException){

                FieldGroupInvalidValueException invalidValueException = (FieldGroupInvalidValueException)e.getCause();

                updateFieldNotifications(invalidValueException.getInvalidFields());

                Notification.show("The entered data in " + invalidValueException.getInvalidFields().size() + " fields is incomplete or invalid.");

            } else {

                Logger.getLogger(this.getClass()).error("Error saving", e);

                Notification.show("Error saving", Type.ERROR_MESSAGE);

            }

        }

    }

    /**

     * @param invalidFields

     */

    private void updateFieldNotifications(Map<Field<?>, InvalidValueException> invalidFields) {

        for(Field<?> f : invalidFields.keySet()){

            if(f instanceof AbstractField){

                String message = invalidFields.get(f).getHtmlMessage();

                ((AbstractField)f).setComponentError(new UserError(message, ContentMode.HTML, ErrorLevel.ERROR));

            }

        }

    }

    // ------------------------ field adding methods ------------------------ //

    protected TextField addTextField(String caption, String propertyId) {

        return addField(new TextField(caption), propertyId);

    }

    protected TextField addTextField(String caption, String propertyId, int column1, int row1,

            int column2, int row2)

            throws OverlapsException, OutOfBoundsException {

        return addField(new TextField(caption), propertyId, column1, row1, column2, row2);

    }

    protected TextField addTextField(String caption, String propertyId, int column, int row)

            throws OverlapsException, OutOfBoundsException {

        return addField(new TextField(caption), propertyId, column, row);

    }

    protected PopupDateField addDateField(String caption, String propertyId) {

        return addField(new PopupDateField(caption), propertyId);

    }

    protected CheckBox addCheckBox(String caption, String propertyId) {

        return addField(new CheckBox(caption), propertyId);

    }

    protected <T extends Field> T addField(T field, String propertyId) {

        fieldGroup.bind(field, propertyId);

        addComponent(field);

        return field;

    }

    /**

     * Can only be used if the <code>fieldlayout</code> is a GridLayout.

     *

     * @param field

     *            the field to be added, not <code>null</code>.

     * @param propertyId

     * @param column

     *            the column index, starting from 0.

     * @param row

     *            the row index, starting from 0.

     * @throws OverlapsException

     *             if the new component overlaps with any of the components

     *             already in the grid.

     * @throws OutOfBoundsException

     *             if the cell is outside the grid area.

     */

    protected <T extends Field> T addField(T field, String propertyId, int column, int row)

            throws OverlapsException, OutOfBoundsException {

        fieldGroup.bind(field, propertyId);

        addComponent(field, column, row);

        return field;

    }

    /**

     * Can only be used if the <code>fieldlayout</code> is a GridLayout.

     *

     * @param field

     * @param propertyId

     * @param column1

     * @param row1

     * @param column2

     * @param row2

     * @return

     * @throws OverlapsException

     * @throws OutOfBoundsException

     */

    protected <T extends Field> T addField(T field, String propertyId, int column1, int row1,

            int column2, int row2)

            throws OverlapsException, OutOfBoundsException {

        fieldGroup.bind(field, propertyId);

        addComponent(field, column1, row1, column2, row2);

        return field;

    }

    protected void addComponent(Component component) {

        fieldLayout.addComponent(component);

        applyDefaultComponentStyles(component);

    }

    /**

     * @param component

     */

    public void applyDefaultComponentStyles(Component component) {

        component.addStyleName(getDefaultComponentStyles());

    }

    protected abstract String getDefaultComponentStyles();

    /**

     * Can only be used if the <code>fieldlayout</code> is a GridLayout.

     * <p>

     * Adds the component to the grid in cells column1,row1 (NortWest corner of

     * the area.) End coordinates (SouthEast corner of the area) are the same as

     * column1,row1. The coordinates are zero-based. Component width and height

     * is 1.

     *

     * @param component

     *            the component to be added, not <code>null</code>.

     * @param column

     *            the column index, starting from 0.

     * @param row

     *            the row index, starting from 0.

     * @throws OverlapsException

     *             if the new component overlaps with any of the components

     *             already in the grid.

     * @throws OutOfBoundsException

     *             if the cell is outside the grid area.

     */

    public void addComponent(Component component, int column, int row)

            throws OverlapsException, OutOfBoundsException {

        applyDefaultComponentStyles(component);

        gridLayout().addComponent(component, column, row, column, row);

    }

    /**

     * Can only be used if the <code>fieldlayout</code> is a GridLayout.

     * <p>

     * Adds a component to the grid in the specified area. The area is defined

     * by specifying the upper left corner (column1, row1) and the lower right

     * corner (column2, row2) of the area. The coordinates are zero-based.

     * </p>

     *

     * <p>

     * If the area overlaps with any of the existing components already present

     * in the grid, the operation will fail and an {@link OverlapsException} is

     * thrown.

     * </p>

     *

     * @param component

     *            the component to be added, not <code>null</code>.

     * @param column1

     *            the column of the upper left corner of the area <code>c</code>

     *            is supposed to occupy. The leftmost column has index 0.

     * @param row1

     *            the row of the upper left corner of the area <code>c</code> is

     *            supposed to occupy. The topmost row has index 0.

     * @param column2

     *            the column of the lower right corner of the area

     *            <code>c</code> is supposed to occupy.

     * @param row2

     *            the row of the lower right corner of the area <code>c</code>

     *            is supposed to occupy.

     * @throws OverlapsException

     *             if the new component overlaps with any of the components

     *             already in the grid.

     * @throws OutOfBoundsException

     *             if the cells are outside the grid area.

     */

    public void addComponent(Component component, int column1, int row1,

            int column2, int row2)

            throws OverlapsException, OutOfBoundsException {

        applyDefaultComponentStyles(component);

        gridLayout().addComponent(component, column1, row1, column2, row2);

    }

    // ------------------------ data binding ------------------------ //

    protected void bindDesign(Component component) {

        fieldLayout.removeAllComponents();

        fieldGroup.bindMemberFields(component);

        fieldLayout.addComponent(component);

    }

    public void showInEditor(DTO beanToEdit) {

        fieldGroup.setItemDataSource(beanToEdit);

    }

}