/*
    * 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.myfaces.tobago.facelets;
  
  import org.apache.myfaces.tobago.convert.DateTimeConverter;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import javax.el.ELException;
  import javax.el.ValueExpression;
  import javax.faces.component.UIComponent;
  import javax.faces.component.ValueHolder;
  import javax.faces.context.FacesContext;
  import javax.faces.convert.Converter;
  import javax.faces.view.facelets.ComponentHandler;
  import javax.faces.view.facelets.ConverterConfig;
  import javax.faces.view.facelets.ConverterHandler;
  import javax.faces.view.facelets.FaceletContext;
  import javax.faces.view.facelets.TagAttribute;
  import javax.faces.view.facelets.TagException;
  import java.lang.invoke.MethodHandles;
  import java.util.Locale;
  import java.util.TimeZone;
  
  public class ConvertDateTimeHandler extends ConverterHandler {
  
    private static final Logger LOG = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
  
    private final TagAttribute binding;
    private final TagAttribute locale;
    private final TagAttribute pattern;
    private final TagAttribute timeZone;
    private final TagAttribute type;
  
    public ConvertDateTimeHandler(final ConverterConfig config) {
      super(config);
      binding = getAttribute("binding");
      locale = getAttribute("locale");
      pattern = getAttribute("pattern");
      timeZone = getAttribute("timeZone");
      type = getAttribute("type");
    }
  
    @Override
    public void apply(final FaceletContext faceletContext, final UIComponent parent) throws ELException {
      if (parent instanceof ValueHolder) {
        if (ComponentHandler.isNew(parent)) {
          final ValueHolder valueHolder = (ValueHolder) parent;
          Converter converter = null;
          ValueExpression valueExpression = null;
          if (binding != null) {
            valueExpression = binding.getValueExpression(faceletContext, Converter.class);
            converter = (Converter) valueExpression.getValue(faceletContext);
          }
          if (converter == null) {
            converter = FacesContext.getCurrentInstance().getApplication()
                .createConverter(DateTimeConverter.CONVERTER_ID);
            DateTimeConverter dtConverter = (DateTimeConverter) converter;
  
            if (locale != null) {
              final Object localeObject = locale.getObject(faceletContext);
              if (localeObject instanceof Locale) {
                dtConverter.setLocale((Locale) localeObject);
              } else {
                LOG.warn("Could not set local.");
              }
            }
            if (pattern != null) {
              final Object patternObject = pattern.getObject(faceletContext);
              if (patternObject instanceof String) {
                dtConverter.setPattern((String) patternObject);
              } else {
                LOG.warn("Could not set pattern.");
              }
            }
            if (timeZone != null) {
              final Object timeZoneObject = timeZone.getObject(faceletContext);
              if (timeZoneObject instanceof TimeZone) {
                dtConverter.setTimeZone((TimeZone) timeZoneObject);
              } else {
                LOG.warn("Could not set time zone.");
              }
           }
           if (type != null) {
             final Object typeObject = type.getObject(faceletContext);
             if (typeObject instanceof String) {
               dtConverter.setType((String) typeObject);
             } else {
               LOG.warn("Could not set type.");
             }
           }
 
           if (valueExpression != null) {
             valueExpression.setValue(faceletContext, converter);
           }
         }
         if (converter != null) {
           valueHolder.setConverter(converter);
         }
         // TODO else LOG.warn?
       }
     } else {
       throw new TagException(tag, "Parent is not of type ValueHolder, type is: " + parent);
     }
   }
 }