/*
 * @(#)MultilanguageStringEditor.java
 *
 * Copyright 2011 Instituto Superior Tecnico
 * Founding Authors: Pedro Santos
 * 
 *      https://fenix-ashes.ist.utl.pt/
 * 
 *   This file is part of the Bennu-Vadin Integration Module.
 *
 *   The Bennu-Vadin Integration Module is free software: you can
 *   redistribute it and/or modify it under the terms of the GNU Lesser General
 *   Public License as published by the Free Software Foundation, either version 
 *   3 of the License, or (at your option) any later version.
 *
 *   The Bennu-Vadin Module is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *   GNU Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with the Bennu-Vadin Module. If not, see <http://www.gnu.org/licenses/>.
 * 
 */
package module.vaadin.ui;

import pt.ist.bennu.core.domain.VirtualHost;
import pt.utl.ist.fenix.tools.util.i18n.Language;
import pt.utl.ist.fenix.tools.util.i18n.MultiLanguageString;

import com.vaadin.data.Buffered;
import com.vaadin.data.Validator.InvalidValueException;
import com.vaadin.data.util.AbstractProperty;
import com.vaadin.data.util.PropertysetItem;
import com.vaadin.ui.CustomField;
import com.vaadin.ui.Form;

/**
 * 
 * @author Pedro Santos
 * 
 */
public class MultilanguageStringEditor extends CustomField {
    public static class MLSProperty extends AbstractProperty {
        private final Language lang;

        private MultiLanguageString mls;

        public MLSProperty(Language lang, MultiLanguageString mls) {
            this.lang = lang;
            this.mls = mls;
        }

        @Override
        public Object getValue() {
            return mls.getContent(lang);
        }

        @Override
        public void setValue(Object newValue) throws ReadOnlyException, ConversionException {
            mls = mls.with(lang, (String) newValue);
            fireValueChange();
        }

        @Override
        public Class<?> getType() {
            return String.class;
        }
    }

    public static class MLSItem extends PropertysetItem {
        public MLSItem(MultiLanguageString mls) {
            if (mls == null) {
                mls = new MultiLanguageString();
            }
            for (Language language : VirtualHost.getVirtualHostForThread().getSupportedLanguagesSet()) {
                addItemProperty(language, new MLSProperty(language, mls));
            }
        }
    }

    private final Form innerForm;

    public MultilanguageStringEditor(Form parentForm) {
        innerForm = new Form();
        innerForm.setWriteThrough(parentForm.isWriteThrough());
        innerForm.setFormFieldFactory(parentForm.getFormFieldFactory());
        setCompositionRoot(innerForm);
    }

    @Override
    public void setCaption(String caption) {
        super.setCaption(caption);
        innerForm.setCaption(caption);
    }

    @Override
    public void setInternalValue(Object newValue) throws ReadOnlyException, ConversionException {
        MultiLanguageString mls =
                (newValue instanceof MultiLanguageString) ? (MultiLanguageString) newValue : new MultiLanguageString();

        super.setInternalValue(mls);

        // set item data source and visible properties in a single operation to
        // avoid creating fields multiple times
        innerForm.setItemDataSource(new MLSItem(mls));
    }

    @Override
    public void commit() throws Buffered.SourceException, InvalidValueException {
        super.commit();
        innerForm.commit();
    }

    @Override
    public void discard() throws Buffered.SourceException {
        super.discard();
        innerForm.discard();
    }

    @Override
    public Class<?> getType() {
        return MultiLanguageString.class;
    }
}