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.Arrays;

import java.util.EnumSet;

import java.util.List;

import java.util.Optional;

import org.apache.log4j.Logger;

import org.vaadin.viritin.fields.LazyComboBox;

import com.vaadin.data.Validator.InvalidValueException;

import com.vaadin.data.fieldgroup.BeanFieldGroup;

import com.vaadin.data.fieldgroup.FieldGroup;

import com.vaadin.data.util.BeanItem;

import com.vaadin.server.FontAwesome;

import com.vaadin.server.UserError;

import com.vaadin.shared.AbstractFieldState;

import com.vaadin.ui.Button;

import com.vaadin.ui.Component;

import com.vaadin.ui.CssLayout;

import com.vaadin.ui.Field;

import com.vaadin.ui.themes.ValoTheme;

import eu.etaxonomy.cdm.api.util.UserHelper;

import eu.etaxonomy.cdm.hibernate.HibernateProxyHelper;

import eu.etaxonomy.cdm.model.agent.AgentBase;

import eu.etaxonomy.cdm.model.agent.Person;

import eu.etaxonomy.cdm.model.agent.Team;

import eu.etaxonomy.cdm.model.agent.TeamOrPersonBase;

import eu.etaxonomy.cdm.model.permission.CRUD;

import eu.etaxonomy.cdm.service.CdmFilterablePagingProvider;

import eu.etaxonomy.cdm.service.UserHelperAccess;

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

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

import eu.etaxonomy.cdm.vaadin.util.TeamOrPersonBaseCaptionGenerator;

import eu.etaxonomy.cdm.vaadin.util.converter.CdmBaseDeproxyConverter;

import eu.etaxonomy.cdm.vaadin.view.name.CachingPresenter;

import eu.etaxonomy.vaadin.component.CompositeCustomField;

import eu.etaxonomy.vaadin.component.EntityFieldInstantiator;

import eu.etaxonomy.vaadin.component.ReloadableLazyComboBox;

import eu.etaxonomy.vaadin.component.SwitchableTextField;

import eu.etaxonomy.vaadin.component.ToManyRelatedEntitiesListSelect;

/**

 * @author a.kohlbecker

 * @since May 11, 2017

 *

 */

public class TeamOrPersonField extends CompositeCustomField<TeamOrPersonBase<?>> {

    private static final long serialVersionUID = 660806402243118112L;

    private static final Logger logger = Logger.getLogger(TeamOrPersonField.class);

    private static final String PRIMARY_STYLE = "v-team-or-person-field";

    private CssLayout root = new CssLayout();

    private CssLayout toolBar= new CssLayout();

    private CssLayout compositeWrapper = new CssLayout();

    private ReloadableLazyComboBox<TeamOrPersonBase> teamOrPersonSelect = new ReloadableLazyComboBox<TeamOrPersonBase>(TeamOrPersonBase.class);

    private Button removeButton = ButtonFactory.REMOVE_ALL_ITEMS.createButton();

    private Button personButton = new Button(FontAwesome.USER);

    private Button teamButton = new Button(FontAwesome.USERS);

    // Fields for case when value is a Person

    private PersonField personField = new PersonField();

    // Fields for case when value is a Team

    private SwitchableTextField titleField = new SwitchableTextField("Team (bibliographic)");

    private SwitchableTextField nomenclaturalTitleCacheField = new SwitchableTextField("Team (nomenclatural)");

    private ToManyRelatedEntitiesListSelect<Person, PersonField> personsListEditor = new ToManyRelatedEntitiesListSelect<Person, PersonField>(Person.class, PersonField.class, "Team members");

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

    private TeamOrPersonBaseCaptionGenerator.CacheType cacheType;

    protected List<Component> editorComponents = Arrays.asList(removeButton, personButton, teamButton, teamOrPersonSelect);

    public TeamOrPersonField(String caption, TeamOrPersonBaseCaptionGenerator.CacheType cacheType){

        setCaption(caption);

        this.cacheType = cacheType;

        teamOrPersonSelect.setCaptionGenerator(new TeamOrPersonBaseCaptionGenerator<TeamOrPersonBase>(cacheType));

        addStyledComponent(teamOrPersonSelect);

        addStyledComponent(personField);

        addStyledComponent(titleField);

        addStyledComponent(nomenclaturalTitleCacheField);

        addStyledComponent(personsListEditor);

        addStyledComponents(removeButton, personButton, teamButton);

        addSizedComponent(root);

        addSizedComponent(compositeWrapper);

        addSizedComponent(personField);

        addSizedComponent(titleField);

        addSizedComponent(nomenclaturalTitleCacheField);

        addSizedComponent(personsListEditor);

        setConverter(new CdmBaseDeproxyConverter<TeamOrPersonBase<?>>());

        updateToolBarButtonStates();

    }

    /**

     * {@inheritDoc}

     */

    @Override

    protected Component initContent() {

        teamOrPersonSelect.addValueChangeListener(e -> {

            setValue(teamOrPersonSelect.getValue(), false, true);

        });

        teamOrPersonSelect.setWidthUndefined();

        removeButton.addClickListener(e -> {

            teamOrPersonSelect.clear();

            setValue(null, false, true);

        });

        removeButton.setDescription("Remove");

        personButton.addClickListener(e -> {

            setValue(Person.NewInstance(), false, true);

            resetReadOnlyComponents();

        });

        personButton.setDescription("Add person");

        teamButton.addClickListener(e -> {

            setValue(Team.NewInstance(), false, true);

            resetReadOnlyComponents();

        });

        teamButton.setDescription("Add team");

        toolBar.setStyleName(ValoTheme.LAYOUT_COMPONENT_GROUP + " toolbar");

        toolBar.addComponents(teamOrPersonSelect,  removeButton, personButton, teamButton);

        compositeWrapper.setStyleName("margin-wrapper");

        compositeWrapper.addComponent(toolBar);

        root.setPrimaryStyleName(PRIMARY_STYLE);

        root.addComponent(compositeWrapper);

        return root;

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public Class getType() {

        return TeamOrPersonBase.class;

    }

    private void updateToolBarButtonStates(){

        TeamOrPersonBase<?> val = getInternalValue();

        boolean userCanCreate = UserHelperAccess.userHelper().userHasPermission(Person.class, "CREATE");

        teamOrPersonSelect.setVisible(val == null);

        removeButton.setVisible(!isReadOnly() && val != null);

        personButton.setEnabled(!isReadOnly() && userCanCreate && val == null);

        teamButton.setEnabled(!isReadOnly() && userCanCreate && val == null);

    }

    /**

     * {@inheritDoc}

     */

    @Override

    protected void setInternalValue(TeamOrPersonBase<?> newValue) {

        TeamOrPersonBase<?> oldValue = getValue();

        super.setInternalValue(newValue);

        newValue = HibernateProxyHelper.deproxy(newValue);

        compositeWrapper.removeAllComponents();

        compositeWrapper.addComponent(toolBar);

        if(newValue != null) {

            if(Person.class.isAssignableFrom(newValue.getClass())){

                // value is a Person

                compositeWrapper.addComponent(personField);

                personField.setValue((Person) newValue);

                personField.registerParentFieldGroup(fieldGroup);

            }

            else if(Team.class.isAssignableFrom(newValue.getClass())){

                // otherwise it a Team

                compositeWrapper.addComponents(titleField, nomenclaturalTitleCacheField, personsListEditor);

                titleField.bindTo(fieldGroup, "titleCache", "protectedTitleCache");

                nomenclaturalTitleCacheField.bindTo(fieldGroup, "nomenclaturalTitleCache", "protectedNomenclaturalTitleCache");

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

                fieldGroup.bind(personsListEditor, "teamMembers");

                personsListEditor.registerParentFieldGroup(fieldGroup);

            } else {

                UserError usererror = new UserError("TeamOrPersonField Error: Unsupported value type: " + newValue.getClass().getName());

                setComponentError(usererror);

                logger.error(usererror.getMessage());

            }

        } else {

            // new value is null

            if(oldValue != null){

                // value is null --> clean up all nested fields from old value

                // allow replacing old content in the editor by null

                setReadOnlyComponents(false);

                if(Person.class.isAssignableFrom(oldValue.getClass())){

                    personField.unregisterParentFieldGroup(fieldGroup);

                    personField.setReadOnly(false);

                    personField.setValue((Person) null);

                } else if(Team.class.isAssignableFrom(oldValue.getClass())){

                    titleField.unbindFrom(fieldGroup);

                    nomenclaturalTitleCacheField.unbindFrom(fieldGroup);

                    fieldGroup.unbind(personsListEditor);

                    fieldGroup.setItemDataSource((Team)null);

                    personsListEditor.registerParentFieldGroup(null);

                    personsListEditor.setReadOnly(false);

                    personsListEditor.setValue(null);

                    personsListEditor.registerParentFieldGroup(null);

                } else {

                    UserError usererror = new UserError("TeamOrPersonField Error: Unsupported value type in oldValue: " + oldValue.getClass().getName());

                    setComponentError(usererror);

                    logger.error(usererror.getMessage());

                }

            }

        }

        adaptToUserPermissions(newValue);

        updateToolBarButtonStates();

    }

    private void adaptToUserPermissions(TeamOrPersonBase teamOrPerson) {

        UserHelper userHelper = UserHelperAccess.userHelper();

        boolean canEdit = teamOrPerson == null || !teamOrPerson.isPersited() || userHelper.userHasPermission(teamOrPerson, CRUD.UPDATE);

        if(!canEdit){

            setReadOnlyComponents(true);

            fieldGroup.setReadOnly(true); // really needed?

        }

    }

    /**

     * {@inheritDoc}

     */

    @Override

    protected void addDefaultStyles() {

        // no default styles here

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public Optional<FieldGroup> getFieldGroup() {

        return Optional.of(fieldGroup);

    }

    public Component[] getCachFields(){

        return new Component[]{titleField, nomenclaturalTitleCacheField};

    }

    /**

     * @return the teamOrPersonSelect

     */

    public LazyComboBox<TeamOrPersonBase> getTeamOrPersonSelect() {

        return teamOrPersonSelect;

    }

    /**

     * {@inheritDoc}

     */

    @SuppressWarnings("unchecked")

    @Override

    public void commit() throws SourceException, InvalidValueException {

        //need to commit the subfields propagation through the fielGroups is not enough

        personField.commit();

        personsListEditor.commit();

        if(!getState(false).readOnly && getPropertyDataSource().isReadOnly()){

            // the TeamOrPersonBase Editor (remove, addPerson, addTeam) is not readonly

            // thus removing the TeamOrPerson is allowed. In case the datasource is readonly

            // due to missing user grants for the TeamOrPerson it must be set to readWrite to

            // make it possible to change the property of the parent

            getPropertyDataSource().setReadOnly(false);

        }

        super.commit();

        if(hasNullContent()){

            getPropertyDataSource().setValue(null);

            setValue(null);

        }

        TeamOrPersonBase<?> bean = getValue();

        boolean isTeam = bean != null && bean instanceof Team;

        if(isTeam){

            boolean isUnsaved = bean.getId() == 0;

            if(isUnsaved){

                UserHelperAccess.userHelper().createAuthorityForCurrentUser(bean, EnumSet.of(CRUD.UPDATE, CRUD.DELETE), null);

            }

        }

    }

    /**

     * {@inheritDoc}

     */

    @Override

    protected List<Field> nullValueCheckIgnoreFields() {

        List<Field> ignoreFields =  super.nullValueCheckIgnoreFields();

        ignoreFields.add(personField);

        ignoreFields.add(nomenclaturalTitleCacheField.getUnlockSwitch());

        if(nomenclaturalTitleCacheField.getUnlockSwitch().getValue().booleanValue() == false){

            ignoreFields.add(nomenclaturalTitleCacheField.getTextField());

        }

        ignoreFields.add(titleField.getUnlockSwitch());

        if(titleField.getUnlockSwitch().getValue().booleanValue() == false){

            ignoreFields.add(titleField.getTextField());

        }

        return ignoreFields;

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public boolean hasNullContent() {

        TeamOrPersonBase<?> bean = getValue();

        if(bean == null) {

            return true;

        }

        if(bean instanceof Team){

            // --- Team

            return super.hasNullContent();

        } else {

            // --- Person

            return personField.hasNullContent();

        }

    }

    public void setFilterableTeamPagingProvider(CdmFilterablePagingProvider<AgentBase, TeamOrPersonBase> pagingProvider, CachingPresenter cachingPresenter){

        teamOrPersonSelect.loadFrom(pagingProvider, pagingProvider, pagingProvider.getPageSize());

        // NOTE:

        //   it is important to add the ToOneRelatedEntityReloader to the TeamOrPersonField directly

        //   since the value of the select will be immediately passed to the TeamOrPersonField

        ToOneRelatedEntityReloader<TeamOrPersonBase<?>> teamOrPersonReloader = new ToOneRelatedEntityReloader<TeamOrPersonBase<?>>(this, cachingPresenter);

        this.addValueChangeListener(teamOrPersonReloader);

    }

    public void setFilterablePersonPagingProvider(CdmFilterablePagingProvider<AgentBase, Person> pagingProvider, CachingPresenter cachingPresenter){

        personsListEditor.setEntityFieldInstantiator(new EntityFieldInstantiator<PersonField>() {

            @Override

            public PersonField createNewInstance() {

                PersonField f = new PersonField();

                f.setAllowNewEmptyEntity(true); // otherwise new entities can not be added to the personsListEditor

                f.getPersonSelect().loadFrom(pagingProvider, pagingProvider, pagingProvider.getPageSize());

                f.getPersonSelect().setCaptionGenerator(new TeamOrPersonBaseCaptionGenerator<Person>(cacheType));

                // NOTE:

                //   it is important to add the ToOneRelatedEntityReloader to the PersonField directly

                //   since the value of the select will be immediately passed to the PersonField:

                f.addValueChangeListener(new ToOneRelatedEntityReloader<Person>(f, cachingPresenter));

                return f;

            }

        });

    }

    @Override

    public void setValue(TeamOrPersonBase<?> newFieldValue) {

        // ignore readonly states of the datasource

        setValue(newFieldValue, false, !hasSharedStateReadOnly());

    }

    protected boolean hasSharedStateReadOnly(){

        AbstractFieldState sharedState = getState(false);

        return sharedState.readOnly;

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public void setReadOnly(boolean readOnly) {

//        super.setReadOnly(readOnly); // moved into setEditorReadOnly()

        setReadOnlyComponents(readOnly);

    }

    public void setEditorReadOnly(boolean readOnly) {

        super.setReadOnly(readOnly);

        for(Component c : editorComponents){

            applyReadOnlyState(c, readOnly);

        }

    }

    /**

     * Reset the readonly state of nested components to <code>false</code>.

     */

    protected void resetReadOnlyComponents() {

        if(!isReadOnly()){

            setReadOnlyComponents(false);

        }

    }

    /**

     * Set the nested components (team or person fields) to read only but

     * keep the state of the <code>TeamOrPersonField</code> untouched so

     * that the <code>teamOrPersonSelect</code>, <code>removeButton</code>,

     * <code>personButton</code> and <code>teamButton</code> stay operational.

     *

     * @param readOnly

     */

    protected void setReadOnlyComponents(boolean readOnly) {

        // setDeepReadOnly(readOnly, getContent(), editorComponents);

        // editorComponents.forEach(c -> c.setEnabled(!readOnly));

//        personField.setReadOnly(readOnly);

//        personsListEditor.setReadOnly(readOnly);

        updateCaptionReadonlyNotice(readOnly);

    }

}