/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.wicket.examples.ajax.builtin;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;

import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.form.AjaxFormSubmitBehavior;
import org.apache.wicket.extensions.ajax.markup.html.autocomplete.AutoCompleteTextField;
import org.apache.wicket.markup.html.basic.MultiLineLabel;
import org.apache.wicket.markup.html.form.Form;
import org.apache.wicket.model.IModel;
import org.apache.wicket.model.PropertyModel;
import org.apache.wicket.util.string.Strings;


/**
 * Page that demos the ajax auto complete text field
 * 
 * @author ivaynberg
 */
public class AutoCompletePage extends BasePage
{
    private StringBuilder values = new StringBuilder();

    /**
     * Constructor
     */
    public AutoCompletePage()
    {
        Form<Void> form = new Form<>("form");
        add(form);

        final IModel<String> model = new IModel<String>()
        {
            private String value = null;

            @Override
            public String getObject()
            {
                return value;
            }

            @Override
            public void setObject(String object)
            {
                value = object;

                values.append('\n');
                values.append(value);
            }
        };

        final AutoCompleteTextField<String> field = new AutoCompleteTextField<String>("ac", model)
        {
            @Override
            protected Iterator<String> getChoices(String input)
            {
                if (Strings.isEmpty(input))
                {
                    List<String> emptyList = Collections.emptyList();
                    return emptyList.iterator();
                }

                List<String> choices = new ArrayList<>(10);

                Locale[] locales = Locale.getAvailableLocales();

                for (final Locale locale : locales)
                {
                    final String country = locale.getDisplayCountry();

                    if (country.toUpperCase(Locale.ROOT).startsWith(input.toUpperCase(Locale.ROOT)))
                    {
                        choices.add(country);
                        if (choices.size() == 10)
                        {
                            break;
                        }
                    }
                }

                return choices.iterator();
            }
        };
        form.add(field);

        final MultiLineLabel label = new MultiLineLabel("history", new PropertyModel<String>(this,
            "values"));
        label.setOutputMarkupId(true);
        form.add(label);

        field.add(new AjaxFormSubmitBehavior(form, "change")
        {
            @Override
            protected void onSubmit(AjaxRequestTarget target)
            {
                target.add(label);
            }

            @Override
            protected void onError(AjaxRequestTarget target)
            {
            }
        });
    }
}