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.EnumSet;

import java.util.List;

import org.vaadin.teemu.switchui.Switch;

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.ui.Button;

import com.vaadin.ui.Component;

import com.vaadin.ui.CssLayout;

import com.vaadin.ui.Field;

import com.vaadin.ui.TextField;

import com.vaadin.ui.themes.ValoTheme;

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

import eu.etaxonomy.cdm.persistence.hibernate.permission.CRUD;

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

import eu.etaxonomy.cdm.vaadin.security.UserHelper;

import eu.etaxonomy.vaadin.component.CompositeCustomField;

import eu.etaxonomy.vaadin.component.SwitchButton;

/**

 * @author a.kohlbecker

 * @since May 11, 2017

 *

 */

public class PersonField extends CompositeCustomField<Person> {

    private static final long serialVersionUID = 8346575511284469356L;

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

    /**

     * do not allow entities which are having only <code>null</code> values in all fields

     * {@link #getValue()} would return <code>null</code> in this case.

     */

    boolean allowNewEmptyEntity = true;

    private LazyComboBox<Person> personSelect = new LazyComboBox<Person>(Person.class);

    private Button personSelectConfirmButton = new Button("OK");

    private Button newPersonButton = new Button("New");

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

    enum Mode {

        CACHE_MODE, DETAILS_MODE;

        public String toCssClass() {

            return name().toLowerCase().replace("_", "-");

        }

    }

    private Mode currentMode = null;

    private float baseWidth = 100 / 8;

    private CssLayout root = new CssLayout();

    private CssLayout selectOrNewContainer = new CssLayout();

    private TextField cacheField = new TextFieldNFix();

    private CssLayout detailsContainer = new CssLayout();

    private TextField firstNameField = new TextFieldNFix();

    private TextField lastNameField = new TextFieldNFix();

    private TextField prefixField = new TextFieldNFix();

    private TextField suffixField = new TextFieldNFix();

    private SwitchButton unlockSwitch = new SwitchButton();

    private boolean onCommit = false;

    /**

     * @param caption

     */

    public PersonField(String caption) {

        this();

        setCaption(caption);

    }

    /**

     * @param caption

     */

    public PersonField() {

        root.setPrimaryStyleName(PRIMARY_STYLE);

        // select existing or create new person

        addStyledComponents(personSelect, personSelectConfirmButton, newPersonButton);

        personSelect.addValueChangeListener(e -> {

            if(personSelect.getValue() != null){

                personSelectConfirmButton.setEnabled(true);

            }

        });

        personSelectConfirmButton.setEnabled(false);

        personSelectConfirmButton.addClickListener(e -> {

            setValue(personSelect.getValue());

            personSelect.clear();

        });

        selectOrNewContainer.addComponents(personSelect, personSelectConfirmButton, newPersonButton);

        newPersonButton.addClickListener(e -> {

            setValue(Person.NewInstance());

        });

        // edit person

        addStyledComponent(cacheField);

        addStyledComponent(firstNameField);

        addStyledComponent(lastNameField);

        addStyledComponent(prefixField);

        addStyledComponent(suffixField);

        addStyledComponent(unlockSwitch);

        addSizedComponent(root);

    }

    /**

     *

     */

    private void checkUserPermissions(Person newValue) {

        boolean userCanEdit = UserHelper.fromSession().userHasPermission(newValue, "DELETE", "UPDATE");

        boolean isUnsavedEnitity = newValue.getId() == 0;

        setEnabled(isUnsavedEnitity || userCanEdit);

    }

    private void setMode(Mode mode){

        if(mode.equals(currentMode)){

            return;

        }

        if(currentMode != null){

            String removeMode = currentMode.toCssClass();

            root.removeStyleName(removeMode);

        }

        String newMode = mode.toCssClass();

        root.addStyleName(newMode);

        currentMode = mode;

    }

    /**

     * {@inheritDoc}

     */

    @Override

    protected Component initContent() {

        selectOrNewContainer.setWidth(100, Unit.PERCENTAGE);

        personSelect.setWidthUndefined();

        root.addComponent(cacheField);

        root.addComponent(unlockSwitch);

        root.addComponent(selectOrNewContainer);

        cacheField.setWidth(100, Unit.PERCENTAGE);

        prefixField.setWidth(baseWidth, Unit.PERCENTAGE);

        prefixField.setInputPrompt("Prefix");

        firstNameField.setWidth(baseWidth * 3, Unit.PERCENTAGE);

        firstNameField.setInputPrompt("First Name");

        lastNameField.setWidth(baseWidth * 3, Unit.PERCENTAGE);

        lastNameField.setInputPrompt("Last Name");

        suffixField.setWidth(baseWidth, Unit.PERCENTAGE);

        suffixField.setInputPrompt("Suffix");

        detailsContainer.setStyleName(ValoTheme.LAYOUT_COMPONENT_GROUP);

        detailsContainer.addComponent(prefixField);

        detailsContainer.addComponent(firstNameField);

        detailsContainer.addComponent(lastNameField);

        detailsContainer.addComponent(suffixField);

        root.addComponent(detailsContainer);

        unlockSwitch.addValueChangeListener(e -> {

            if(refreshMode()){

                switch (currentMode) {

                    case CACHE_MODE:

                        cacheField.focus();

                        break;

                    case DETAILS_MODE:

                        firstNameField.focus();

                        break;

                    default:

                        break;

                }

            }

        });

        unlockSwitch.setValueSetLister(e -> {

            refreshMode();

        });

        addDefaultStyles();

        setMode(Mode.DETAILS_MODE);

        fieldGroup.bind(cacheField, "titleCache");

        fieldGroup.bind(prefixField, "prefix");

        fieldGroup.bind(firstNameField, "firstname");

        fieldGroup.bind(lastNameField, "lastname");

        fieldGroup.bind(suffixField, "suffix");

        fieldGroup.bind(unlockSwitch, "protectedTitleCache");

        fieldGroup.setBuffered(false);

        updateVisibilities(getValue());

        return root;

    }

    /**

     *

     * @return true if the mode has changed

     */

    protected boolean refreshMode() {

        Mode lastMode = currentMode;

        setMode(unlockSwitch.getValue() ? Mode.CACHE_MODE: Mode.DETAILS_MODE);

        return !lastMode.equals(currentMode);

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public Class<? extends Person> getType() {

        return Person.class;

    }

    @Override

    public void setValue(Person person){

//        if(person == null){

//            person = Person.NewInstance();

//        }

        super.setValue(person);

    }

    /**

     * {@inheritDoc}

     */

    @Override

    protected void setInternalValue(Person newValue) {

        super.setInternalValue(newValue);

        fieldGroup.setItemDataSource(newValue);

        checkUserPermissions(newValue);

        updateVisibilities(newValue);

    }

    /**

     *

     */

    private void updateVisibilities(Person person) {

        selectOrNewContainer.setVisible(person == null);

        detailsContainer.setVisible(person != null);

        unlockSwitch.setVisible(person != null);

        cacheField.setVisible(person != null);

    }

    @Override

    protected void addDefaultStyles(){

        cacheField.addStyleName("cache-field");

        detailsContainer.addStyleName("details-fields");

        unlockSwitch.addStyleName(Switch.DOM_STYLE);

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public FieldGroup getFieldGroup() {

        return fieldGroup;

    }

    /**

     * {@inheritDoc}

     */

    @Override

    protected List<Field> nullValueCheckIgnoreFields() {

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

        ignoreFields.add(unlockSwitch);

        if(unlockSwitch.getValue().booleanValue() == false){

            if(getValue().getId() == 0){

                // only it the entity is unsaved!

                ignoreFields.add(cacheField);

                cacheField.setValue(null);

            }

        }

        return ignoreFields;

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public void commit() throws SourceException, InvalidValueException {

        super.commit();

        Person bean =  getValue();

        if(bean != null){

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

            if(isUnsaved && !(hasNullContent() && !allowNewEmptyEntity)){

                UserHelper.fromSession().createAuthorityForCurrentUser(bean, EnumSet.of(CRUD.UPDATE, CRUD.DELETE), null);

            }

        }

    }

    /**

     * {@inheritDoc}

     *

     * @return returns <code>null</code> in case the edited entity is unsaved and if

     * it only has null values.

     */

    @Override

    public Person getValue() {

        Person bean = super.getValue();

        if(bean == null){

            return null;

        }

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

//        if(isUnsaved && hasNullContent() && !allowNewEmptyEntity) {

//            return null;

//        }

        return bean;

    }

    /**

     * @return the personSelect

     */

    public LazyComboBox<Person> getPersonSelect() {

        return personSelect;

    }

    /**

     * @param personSelect the personSelect to set

     */

    public void setPersonSelect(LazyComboBox<Person> personSelect) {

        this.personSelect = personSelect;

    }

    /**

     * @return the allowNewEmptyEntity

     */

    public boolean isAllowNewEmptyEntity() {

        return allowNewEmptyEntity;

    }

    /**

     * @param allowNewEmptyEntity the allowNewEmptyEntity to set

     */

    public void setAllowNewEmptyEntity(boolean allowNewEmptyEntity) {

        this.allowNewEmptyEntity = allowNewEmptyEntity;

    }

}