<?php
/**
 * 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.
 */

/**
 * Basic methods for InputAtomConverter and InputXmlConverter.
 */
class InputBasicXmlConverter {

  public static function loadString($requestParam, $namespace = null) {
    return simplexml_load_string($requestParam, 'SimpleXMLElement', LIBXML_NOCDATA, $namespace);
  }

  public static function convertActivities($xml, $activityXml) {
    $activity = array();
    if (! isset($xml->title)) {
      throw new Exception("Mallformed activity xml");
    }
    // remember to either type cast to (string) or trim() the string so we don't get 
    // SimpleXMLString types in the internal data representation. I often prefer
    // using trim() since it cleans up the data too
    $activity['id'] = isset($xml->id) ? trim($xml->id) : '';
    $activity['title'] = trim($xml->title);
    $activity['body'] = isset($xml->summary) ? trim($xml->summary) : '';
    $activity['streamTitle'] = isset($activityXml->streamTitle) ? trim($activityXml->streamTitle) : '';
    $activity['streamId'] = isset($activityXml->streamId) ? trim($activityXml->streamId) : '';
    $activity['updated'] = isset($xml->updated) ? trim($xml->updated) : '';
    if (isset($activityXml->mediaItems)) {
      $activity['mediaItems'] = array();
      foreach ($activityXml->mediaItems->MediaItem as $mediaItem) {
        $item = array();
        if (! isset($mediaItem->type) || ! isset($mediaItem->mimeType) || ! isset($mediaItem->url)) {
          throw new Exception("Invalid media item in activity xml");
        }
        $item['type'] = trim($mediaItem->type);
        $item['mimeType'] = trim($mediaItem->mimeType);
        $item['url'] = trim($mediaItem->url);
        $activity['mediaItems'][] = $item;
      }
    }
    return $activity;
  }

  public static function convertMessages($requestParam, $xml, $content) {
    $message = array();
    if (! isset($xml->title) || ! isset($content)) {
      throw new Exception("Invalid message structure");
    }
    $message['id'] = isset($xml->id) ? trim($xml->id) : null;
    $message['title'] = trim($xml->title);
    $message['body'] = trim($content);
    // retrieve recipients by looking at the osapi name space
    $xml = self::loadString($requestParam, "http://opensocial.org/2008/opensocialapi");
    if (! isset($xml->recipient)) {
      throw new Exception("Invalid message structure");
    }
    $message['recipients'] = array();
    foreach ($xml->recipient as $recipient) {
      $message['recipients'][] = trim($recipient);
    }
    return $message;
  }
}