/*
 * 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.sling.feature.cpconverter.handlers;

import java.io.InputStream;
import java.util.Arrays;
import java.util.Calendar;
import java.util.Dictionary;
import java.util.List;

import javax.jcr.PropertyType;

import org.apache.felix.cm.json.Configurations;
import org.apache.jackrabbit.util.ISO8601;
import org.apache.jackrabbit.vault.util.DocViewProperty;
import org.apache.sling.feature.cpconverter.shared.AbstractJcrNodeParser;
import org.codehaus.plexus.util.StringUtils;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;

import com.google.common.base.Function;
import com.google.common.collect.Lists;

public final class XmlConfigurationEntryHandler extends AbstractConfigurationEntryHandler {

    public XmlConfigurationEntryHandler() {
        super("xml");
    }

    @Override
    protected Dictionary<String, Object> parseConfiguration(String name, InputStream input) throws Exception {
        JcrConfigurationHandler configurationHandler = new JcrConfigurationHandler();
        try {
            return configurationHandler.parse(input);
        } catch (Exception e) {
            logger.warn("Current OSGi configuration does not represent a valid XML document, see nested exceptions", e);
            return null;
        }
    }

    protected static final class JcrConfigurationHandler extends AbstractJcrNodeParser<Dictionary<String, Object>> {

        private static final String SLING_OSGICONFIG = "sling:OsgiConfig";

        private Dictionary<String, Object> configuration;

        public JcrConfigurationHandler() {
            super(SLING_OSGICONFIG);
        }

        @Override
        protected void onJcrRootElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
            configuration = Configurations.newConfiguration();

            for (int i = 0; i < attributes.getLength(); i++) {
                String attributeQName = attributes.getQName(i);

                // ignore jcr: and similar properties
                if (attributeQName.indexOf(':') == -1) {
                    String attributeValue = attributes.getValue(i);

                    if (attributeValue != null && !attributeValue.isEmpty()) {
                        DocViewProperty property = DocViewProperty.parse(attributeQName, attributeValue);
                        Object value = property.values;
                        List<String> strValues = Arrays.asList(property.values);
                        switch (property.type) {
                            case PropertyType.DATE:
                                // Date was never properly supported as osgi configs don't support dates so converting to millis 
                                // Scenario should just be theoretical
                                value = Lists.transform(strValues, new Function<String, Long>() {
                                   public Long apply(String s) {
                                      Long res = null;
                                      if (s != null) {
                                           Calendar cal = ISO8601.parse(s);
                                           if (cal != null) {
                                               res = cal.getTimeInMillis();
                                           }
                                      } 
                                      return res;
                                   }
                                }).toArray();
                                break;
                            case PropertyType.DOUBLE:
                                value = Lists.transform(strValues, new Function<String, Double>() {
                                   public Double apply(String s) {
                                      Double res = null;
                                      if (StringUtils.isNotEmpty(s)) {
                                          res = Double.parseDouble(s);
                                      }
                                      return res;
                                   }
                                }).toArray();
                                break;
                            case PropertyType.LONG:
                                value = Lists.transform(strValues, new Function<String, Long>() {
                                    public Long apply(String s) {
                                       Long res = null;
                                       if (StringUtils.isNotEmpty(s)) {
                                          res = Long.parseLong(s);
                                       }
                                       return res;
                                    }
                                 }).toArray();
                                break;
                            case PropertyType.BOOLEAN:
                                value = Lists.transform(strValues, new Function<String, Boolean>() {
                                    public Boolean apply(String s) {
                                       Boolean res = null;
                                       if (s != null) {
                                          res = Boolean.valueOf(s);
                                       } 
                                       return res;
                                    }
                                 }).toArray();
                                break;
                        }
                        if (!property.isMulti) {
                            // first element to be used in case of singlevalue
                            value = ((Object[])value)[0];
                        }
                         
                        
                        if (property.values.length > 0) {
                            configuration.put(attributeQName, value);
                        }
                    }
                }
            }
        }

        @Override
        protected Dictionary<String, Object> getParsingResult() {
            return configuration;
        }

    }

}