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.cdm.vaadin.component.common;

import java.util.HashSet;

import java.util.Set;

import com.vaadin.data.Validator.InvalidValueException;

import com.vaadin.data.fieldgroup.BeanFieldGroup;

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

import com.vaadin.data.util.BeanItem;

import com.vaadin.event.FieldEvents.TextChangeEvent;

import com.vaadin.server.FontAwesome;

import com.vaadin.ui.Alignment;

import com.vaadin.ui.Button;

import com.vaadin.ui.Component;

import com.vaadin.ui.CssLayout;

import com.vaadin.ui.CustomField;

import com.vaadin.ui.GridLayout;

import com.vaadin.ui.Label;

import com.vaadin.ui.TextField;

import com.vaadin.ui.themes.ValoTheme;

import eu.etaxonomy.cdm.model.common.TimePeriod;

import eu.etaxonomy.cdm.strategy.parser.TimePeriodParser;

import eu.etaxonomy.cdm.vaadin.component.PartialDateField;

import eu.etaxonomy.cdm.vaadin.component.TextFieldNFix;

import eu.etaxonomy.cdm.vaadin.component.registration.RegistrationStyles;

import eu.etaxonomy.cdm.vaadin.util.formatter.DateTimeFormat;

import eu.etaxonomy.cdm.vaadin.util.formatter.TimePeriodFormatter;

/**

 * @author a.kohlbecker

 * @since Apr 6, 2017

 *

 */

public abstract class AbstractTimePeriodField<T extends TimePeriod> extends CustomField<T> {

    private static final long serialVersionUID = -7377778547595966252L;

    private static final String PRIMARY_STYLE = "v-time-period-field";

    private BeanFieldGroup<TimePeriod> fieldGroup = new BeanFieldGroup<>(TimePeriod.class);

    TextField parseField = null;

    TextField freeText = null;

    Label toLabel = null;

    GridLayout detailsViewGrid = new GridLayout(3, 4);

    CssLayout detailsView = new CssLayout();

    //TODO implement custom button textfield which does not require a gridLayout

    GridLayout buttonTextField = new GridLayout(2, 1);

    GridLayout simpleView = new GridLayout(2, 1);

    TextField cacheField = new TextFieldNFix();

    Set<Component> styledComponents = new HashSet<>();

    private TimePeriodFormatter timePeriodFormatter = new TimePeriodFormatter(DateTimeFormat.ISO8601_DATE);

    /**

     *

     */

    public AbstractTimePeriodField() {

        super();

    }

    /**

     * @param string

     */

    public AbstractTimePeriodField(String string) {

        this();

        setCaption(string);

    }

    /**

     * {@inheritDoc}

     */

    @Override

    protected Component initContent() {

        super.setPrimaryStyleName(PRIMARY_STYLE);

        CssLayout root = new CssLayout();

        initSimpleView();

        initDetailsView();

        detailsView.setWidth(100, Unit.PERCENTAGE);

        simpleView.setWidth(100, Unit.PERCENTAGE);

        root.addComponent(simpleView);

        root.addComponent(detailsView);

        applyDefaultStyles();

        showSimple();

        root.setWidth(100, Unit.PERCENTAGE);

        // fixed size to avoid layout and component expansion problems in the nested grid layouts

        this.setWidth(300, Unit.PIXELS);

        return root;

    }

    /**

     *

     */

    private void initSimpleView() {

        Button showDetailsButton = new Button(FontAwesome.CALENDAR);

        showDetailsButton.addClickListener(e -> showDetails());

        cacheField.setWidth(100, Unit.PERCENTAGE);

        // showDetailsButton.setWidth(100, Unit.PERCENTAGE);

        simpleView.addStyleName(ValoTheme.LAYOUT_COMPONENT_GROUP);

        simpleView.addComponent(showDetailsButton, 0, 0);

        simpleView.addComponent(cacheField, 1, 0);

        simpleView.setColumnExpandRatio(1, 0.9f);

    }

    /**

     *

     */

    private void initDetailsView() {

        parseField = new TextFieldNFix();

        // parseField.setWidth(100, Unit.PERCENTAGE);

        parseField.setInputPrompt("This field will parse the entered time period");

        parseField.addTextChangeListener(e -> parseInput(e));

        parseField.setWidth(100, Unit.PERCENTAGE);

        Button closeDetailsButton = new Button(FontAwesome.CLOSE);

        closeDetailsButton.addClickListener(e -> {

            try {

                fieldGroup.commit();

            } catch (CommitException e1) {

                // TODO Auto-generated catch block

                e1.printStackTrace();

            }

            updateCacheField();

            showSimple();

        });

        buttonTextField.addStyleName(ValoTheme.LAYOUT_COMPONENT_GROUP);

        buttonTextField.setWidth(100, Unit.PERCENTAGE);

        buttonTextField.addComponent(closeDetailsButton, 0, 0);

        buttonTextField.addComponent(parseField, 1, 0);

        buttonTextField.setColumnExpandRatio(1, 1.0f);

        PartialDateField startDate = new PartialDateField("Start");

        startDate.setInputPrompt("dd.mm.yyyy");

        PartialDateField endDate = new PartialDateField("End");

        endDate.setInputPrompt("dd.mm.yyyy");

        freeText = new TextFieldNFix("FreeText");

        freeText.setWidth(100, Unit.PERCENTAGE);

        fieldGroup.bind(startDate, "start");

        fieldGroup.bind(endDate, "end");

        fieldGroup.bind(freeText, "freeText");

        toLabel = new Label("\u2014"); // EM DASH : 0x2014

        startDate.setWidth(100, Unit.PERCENTAGE);

        endDate.setWidth(100, Unit.PERCENTAGE);

        toLabel.setWidthUndefined();

        int row = 0;

        detailsViewGrid.addComponent(buttonTextField, 0, row, 2, row);

        row++;

        detailsViewGrid.addComponent(startDate, 0, row, 0, row);

        detailsViewGrid.addComponent(toLabel, 1, row);

        detailsViewGrid.setComponentAlignment(toLabel, Alignment.BOTTOM_CENTER);

        detailsViewGrid.addComponent(endDate, 2, row, 2, row);

        row++;

        detailsViewGrid.addComponent(freeText, 0, row, 2, row);

        detailsViewGrid.setWidth(100, Unit.PERCENTAGE);

        detailsViewGrid.setColumnExpandRatio(0,  5);

        detailsViewGrid.setColumnExpandRatio(1,  1);

        detailsViewGrid.setColumnExpandRatio(2,  5);

        // apply the style of the container to all child components. E.g. make all tiny

        addStyleName((getStyleName()));

        detailsView.setStyleName("margin-wrapper");

        detailsView.addComponent(detailsViewGrid);

    }

    /**

     * @return

     */

    private void showSimple() {

        detailsView.setVisible(false);

        simpleView.setVisible(true);

    }

    /**

     * @return

     */

    private void showDetails() {

        detailsView.setVisible(true);

        simpleView.setVisible(false);

    }

    /**

     * @param e

     * @return

     */

    private void parseInput(TextChangeEvent e) {

        if(!e.getText().isEmpty()){

            TimePeriod parsedPeriod = TimePeriodParser.parseString(e.getText());

            fieldGroup.setItemDataSource(new BeanItem<TimePeriod>(parsedPeriod));

        }

    }

    /**

     *

     */

    private void applyDefaultStyles() {

        if(parseField != null) {

            parseField.addStyleName(RegistrationStyles.HELPER_FIELD);

            toLabel.addStyleName("to-label");

            buttonTextField.addStyleName(ValoTheme.LAYOUT_COMPONENT_GROUP);

        }

    }

    @Override

    protected void setInternalValue(T newValue) {

        if(newValue == null){

            newValue = newModelInstance();

        }

        super.setInternalValue(newValue);

            fieldGroup.setItemDataSource(new BeanItem<TimePeriod>(newValue));

        updateCacheField();

    }

    /**

     * @return

     */

    protected abstract T newModelInstance();

    /**

     * @param newValue

     */

    private void updateCacheField() {

        TimePeriod newValue = fieldGroup.getItemDataSource().getBean();

        cacheField.setReadOnly(false);

        cacheField.setValue(timePeriodFormatter.print(newValue));

        cacheField.setReadOnly(true);

    }

    @Override

    public void setStyleName(String style) {

        super.setStyleName(style);

        detailsViewGrid.iterator().forEachRemaining(c -> c.setStyleName(style));

        buttonTextField.iterator().forEachRemaining(c -> c.setStyleName(style));

        simpleView.iterator().forEachRemaining(c -> c.setStyleName(style));

        applyDefaultStyles();

    }

    @Override

    public void addStyleName(String style) {

        super.addStyleName(style);

        detailsViewGrid.iterator().forEachRemaining(c -> c.addStyleName(style));

        simpleView.iterator().forEachRemaining(c -> {

            c.addStyleName(style);

        });

        buttonTextField.iterator().forEachRemaining(c -> c.addStyleName(style));

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public void commit() throws SourceException, InvalidValueException {

        super.commit();

        try {

            fieldGroup.commit();

        } catch (CommitException e) {

            throw new RuntimeException(e);

        }

    }

}