/*
 * 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.extensions.markup.html.form.select;

import java.util.Collection;

import org.apache.wicket.markup.ComponentTag;
import org.apache.wicket.markup.MarkupStream;
import org.apache.wicket.markup.parser.XmlTag.TagType;
import org.apache.wicket.markup.repeater.RepeatingView;
import org.apache.wicket.model.IModel;
import org.apache.wicket.model.util.CollectionModel;
import org.apache.wicket.util.string.Strings;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


/**
 * Component that makes it easy to produce a list of SelectOption components.
 * <p>
 * Has to be attached to a &lt;option&gt; markup tag.
 * 
 * @param <T>
 *            type of elements contained in the model's collection
 * @author Igor Vaynberg (ivaynberg)
 */
public class SelectOptions<T> extends RepeatingView
{
        private static final long serialVersionUID = 1L;

        private static final Logger log = LoggerFactory.getLogger(SelectOptions.class);

        private boolean recreateChoices = false;

        private final IOptionRenderer<T> renderer;

        /**
         * Constructor
         * 
         * @param id
         * @param model
         * @param renderer
         */
        public SelectOptions(final String id, final IModel<? extends Collection<? extends T>> model,
                final IOptionRenderer<T> renderer)
        {
                super(id, model);
                this.renderer = renderer;
                setRenderBodyOnly(true);
        }

        /**
         * Constructor
         * 
         * @param id
         * @param elements
         * @param renderer
         */
        public SelectOptions(final String id, final Collection<? extends T> elements,
                final IOptionRenderer<T> renderer)
        {
                this(id, new CollectionModel<>(elements), renderer);
        }

        /**
         * Controls whether {@link SelectOption}s are recreated on each render.
         * <p>
         * Note: When recreating on each render, {@link #newOption(String, String, IModel)} should return
         * {@link SelectOption}s with stable values, i.e. {@link SelectOption#getValue()} should return
         * a value based on its model object instead of the default auto index, otherwise the current
         * selection will be lost on form errors.
         * 
         * @param refresh
         * @return this for chaining
         * 
         * @see SelectOption#getValue()
         */
        public SelectOptions<T> setRecreateChoices(final boolean refresh)
        {
                recreateChoices = refresh;
                return this;
        }

        /**
         * {@inheritDoc}
         */
        @SuppressWarnings("unchecked")
        @Override
        protected final void onPopulate()
        {
                if ((size() == 0) || recreateChoices)
                {
                        // populate this repeating view with SelectOption components
                        removeAll();

                        Collection<? extends T> modelObject = (Collection<? extends T>)getDefaultModelObject();
                        if (modelObject != null)
                        {
                                for (T value : modelObject)
                                {
                                        // we add our actual SelectOption component to the row
                                        String text = renderer.getDisplayValue(value);
                                        IModel<T> model = renderer.getModel(value);

                                        add(newOption(newChildId(), text, model));
                                }
                        }
                }
        }

        /**
         * Factory method for creating a new <code>SelectOption</code>. Override to add your own
         * extensions, such as Ajax behaviors.
         * 
         * @param id
         *            component id
         * @param text
         * @param model
         * @return a {@link SelectOption}
         */
        protected SelectOption<T> newOption(final String id, final String text, final IModel<T> model)
        {
                SimpleSelectOption<T> option = new SimpleSelectOption<>(id, model, text);
                option.setEscapeModelStrings(this.getEscapeModelStrings());
                return option;
        }

        /**
         * 
         * @param <V>
         */
        private static class SimpleSelectOption<V> extends SelectOption<V>
        {
                private static final long serialVersionUID = 1L;

                private final String text;

                /**
                 * @param id
                 * @param model
                 * @param text
                 */
                public SimpleSelectOption(final String id, final IModel<V> model, final String text)
                {
                        super(id, model);
                        this.text = text;
                }

                /**
                 * {@inheritDoc}
                 */
                @Override
                public void onComponentTagBody(final MarkupStream markupStream, final ComponentTag openTag)
                {
                        CharSequence escaped = text;
                        if (getEscapeModelStrings())
                        {
                                escaped = Strings.escapeMarkup(text);
                        }

                        replaceComponentTagBody(markupStream, openTag, escaped);
                }

                /**
                 * {@inheritDoc}
                 */
                @Override
                protected void onComponentTag(ComponentTag tag)
                {
                        super.onComponentTag(tag);

                        // always transform the tag to <label></label> so even markup defined as <label/>
                        // render
                        tag.setType(TagType.OPEN);
                }
        }

        @Override
        protected void onDetach()
        {
                renderer.detach();

                super.onDetach();
        }
}