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.component;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.Collection;

import java.util.List;

import com.vaadin.data.fieldgroup.FieldGroup;

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

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

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

import com.vaadin.ui.AbstractField;

import com.vaadin.ui.Button;

import com.vaadin.ui.Component;

import com.vaadin.ui.CustomField;

import com.vaadin.ui.Field;

import com.vaadin.ui.HasComponents;

import eu.etaxonomy.cdm.vaadin.event.NestedButtonStateUpdater;

/**

 * TODO implement height methods for full component size support

 *

 * @author a.kohlbecker

 * @since May 12, 2017

 *

 * IMPORTANT see also {@link CompositeStyledComponent} which has almost the same functionality.

 *

 */

@SuppressWarnings("serial")

public abstract class CompositeCustomField<T> extends CustomField<T> implements NestedFieldGroup {

    protected static final String READ_ONLY_CAPTION_SUFFIX = " (read only)";

    private List<Component> styledComponents = new ArrayList<>();

    private List<Component> sizedComponents = new ArrayList<>();

    private CommitHandler commitHandler = new CommitHandler() {

        @Override

        public void preCommit(CommitEvent commitEvent) throws CommitException {

            // commit the nested bean(s) first

            if(getFieldGroup() != null){

                getFieldGroup().commit();

            }

        }

        @Override

        public void postCommit(CommitEvent commitEvent) throws CommitException {

            // noting to do

        }};

    protected List<Component> getStyledComponents() {

        if(styledComponents == null){

            styledComponents = new ArrayList<>();

        }

        return styledComponents;

    }

    /**

     * Implementations preferably call this method in the constructor

     *

     * @param component

     * @return

     */

    protected boolean addStyledComponent(Component component){

        applyCurrentStyleNames(component);

        return styledComponents.add(component);

    }

    /**

     * Implementations preferably call this method in the constructor

     *

     * @param component

     * @return

     */

    protected boolean addStyledComponents(Component ... component){

        List<Component> componentList = Arrays.asList(component);

        componentList.forEach(c -> applyCurrentStyleNames(c));

        return styledComponents.addAll(componentList);

    }

    protected List<Component> getSizedComponents() {

        if(sizedComponents == null){

            sizedComponents = new ArrayList<>();

        }

        return sizedComponents;

    }

    /**

     * Implementations preferably call this method in the constructor

     *

     * @param component

     * @return

     */

    protected boolean addSizedComponent(Component component){

        applyCurrentSize(component);

        return sizedComponents.add(component);

    }

    /**

     * Implementations preferably call this method in the constructor

     *

     * @param component

     * @return

     */

    protected boolean addSizedComponents(Component ... component){

        List<Component> componentList = Arrays.asList(component);

        componentList.forEach(c -> applyCurrentSize(c));

        return sizedComponents.addAll(componentList);

    }

    @Override

    public void setWidth(String width) {

        super.setWidth(width);

        getSizedComponents().forEach(c -> {if(c != null) {c.setWidth(width);}});

    }

    @Override

    public void setWidth(float width, Unit unit){

        super.setWidth(width, unit);

        getSizedComponents().forEach(c -> {if(c != null) {c.setWidth(width, unit);}});

    }

    @Override

    public void setWidthUndefined() {

        super.setWidthUndefined();

        getSizedComponents().forEach(c -> {if(c != null) {c.setWidthUndefined();}});

    }

    @Override

    public void setStyleName(String style) {

        super.setStyleName(style);

        getStyledComponents().forEach(c -> c.setStyleName(style));

        addDefaultStyles();

    }

    @Override

    public void addStyleName(String style) {

        super.addStyleName(style);

        getStyledComponents().forEach(c -> c.addStyleName(style));

    }

    protected void applyCurrentStyleNames(Component newSubComponent){

        newSubComponent.setStyleName(getStyleName());

    }

    protected void applyCurrentSize(Component newSubComponent){

        newSubComponent.setWidth(this.getWidth(), this.getWidthUnits());

    }

    /**

     * Implementations can may apply default styles to components added to <code>StyledComponents</code>

     * to prevent these styles from being overwritten when setStyleName() id called on the composite field.

     */

    protected abstract void addDefaultStyles();

    /**

     * Implementations return the local fieldGroup

     *

     * @return

     */

    @Override

    public abstract FieldGroup getFieldGroup();

    /**

     * @return true if all fields having the value <code>null</code>

     */

    @SuppressWarnings("rawtypes")

    public boolean hasNullContent() {

        Collection<Field> nullValueCheckIgnore = nullValueCheckIgnoreFields();

        return getFieldGroup().getFields().stream()

                .filter(

                        f -> !nullValueCheckIgnore.contains(f)

                )

                //.peek( f -> System.out.println("###> " + f.getCaption() + ": " + f.getValue()))

                .allMatch(

                        f -> {

                            if(f instanceof CompositeCustomField){

                                return ((CompositeCustomField)f).hasNullContent();

                            } else {

                                if(f.getValue() == null) {

                                    return true;

                                } else {

                                    return false;

                                }

                            }

                        }

                );

    }

    /**

     * @return

     */

    protected List<Field> nullValueCheckIgnoreFields() {

        // TODO Auto-generated method stub

        return new ArrayList<Field>(0);

    }

    @Override

    public void registerParentFieldGroup(FieldGroup parent) {

        parent.addCommitHandler(commitHandler);

    }

    @Override

    public void unregisterParentFieldGroup(FieldGroup parent) {

        parent.removeCommitHandler(commitHandler);

    }

    /**

     * @param readOnly

     */

    protected void setDeepReadOnly(boolean readOnly, Component component, Collection<Component> ignore) {

        if(ignore != null && ignore.contains(component)){

            return;

        }

        applyReadOnlyState(component, readOnly);

        if(HasComponents.class.isAssignableFrom(component.getClass())){

            for(Component nestedComponent : ((HasComponents)component)){

                setDeepReadOnly(readOnly, nestedComponent, ignore);

            }

        }

    }

    /**

     * Sets the readonly state for the component but treats Buttons differently.

     * For nested Buttons the readonly state is projected to enabled state to

     * make them inactive. Finally NestedButtonStateUpdaters are triggered to

     * allow to disable buttons accordingly to user permissions.

     *

     * @param readOnly

     * @param component

     */

    protected void applyReadOnlyState(Component component, boolean readOnly) {

        component.setReadOnly(readOnly);

        if(Button.class.isAssignableFrom(component.getClass())){

            component.setEnabled(!readOnly);

        }

        triggerNestedButtonStateUpdaters();

    }

    /**

     *

     */

    protected void triggerNestedButtonStateUpdaters() {

        for(Object l : getListeners(AbstractField.ValueChangeEvent.class)){

           if(NestedButtonStateUpdater.class.isAssignableFrom(l.getClass())){

               // trigger a fake ValueChangeEvent to let the ToOneRelatedEntityButtonUpdater fix the states

               // of nested buttons

               ((NestedButtonStateUpdater)l).valueChange(new AbstractField.ValueChangeEvent(this));

           }

        }

    }

    @Override

    public String toString(){

        return this.getClass().getSimpleName() + ": " +

                ( getValue() != null ? getValue() : "null");

    }

    protected void updateCaptionReadonlyNotice(boolean readOnly) {

        if(readOnly){

            setCaption(getCaption() + READ_ONLY_CAPTION_SUFFIX);

        } else {

            setCaption(getCaption().replace(READ_ONLY_CAPTION_SUFFIX, ""));

        }

    }

}