for reference: here is the Drupal / PHP version of my Mmmovies project (i think i did this about 2 years ago) it works really well actually, it's quite a lot of code though (at over 1k LoC) in the main file, plus a tiny bit more in the include file.

mmmovies_api.misc.inc

<?php

/**
 * @file
 * Miscellaneous supporting functions.
 */


/**
 * Returns a structured array defining the fields bundled with this content type.
 *
 * This is provided as a function so that it can be used in both hook_install()
 * and hook_uninstall().
 *
 * @return associative array (field definitions)
 */
function _mmmovies_api_installed_fields($type = '') {
  $t = get_t();

  switch ($type) {
    case 'movie_releases':
      return array(
        // Count
        'count' => array(
          'field_name' => 'field_mmmovies_api_count',
          'label'      => $t('Count'),
          'type'       => 'number_integer',
          'cardinality' => 1,
        ),
      );

      break;
  }
}


/**
 * Returns a structured array defining the instances for this content type.
 *
 * The instance lets Drupal know which widget to use to allow the user to enter
 * data and how to react in different view modes.
 *
 * This is provided as a function so that it can be used in both hook_install()
 * and hook_uninstall().
 *
 * @return associative array (instance & display mode definitions)
 */
function _mmmovies_api_installed_instances($type = '') {
  $t = get_t();

  switch ($type) {
    case 'movie_releases':
      return array(
        // Count
        'count' => array(
          'field_name'  => 'field_mmmovies_api_count',
          'type'        => 'number_integer',
          'label'       => $t('Count'),
          'widget' => array(
            'type'    => 'number_integer',
            'weight' => 0,
          ),
          'display' => array(
            'default' => array(
              'label' => 'inline',
              'type'  => 'number_integer',
              'weight' => 0,
            ),
            'teaser' => array(
              'type' => 'hidden',
            ),
          ),
        ),
      );

      break;
  }
}

mmmovies_api.module

<?php

/**
 * @file
 * Provides a Services API resource.
 *
 * This web service can be used to identify movie releases by month (and year).
 */


/**
 * Implements hook_menu_alter().
 *
 * Changes the extra menu-items on the login form.
 */
function mmmovies_api_menu_alter(&$items) {
  $items['user/register']['type'] = MENU_CALLBACK;
  $items['user/password']['type'] = MENU_CALLBACK;
}


/**
 * Implements hook_cron().
 *
 * Periodically check that stored data is updated when
 * the external resource responds with a changed version.
 */
function mmmovies_api_cron() {

  /*
   * Note: This limit could be derived from the total count of nodes
   * divided by the number of cron runs in a given time period.
   * e.g. max(1, ceil($count_nodes / (30 * 12))  // 30 days, cron runs 2 hourly
   */
  $limit = 10;
  $threshold = REQUEST_TIME - 86400;      // 1 day ago
  //$threshold = REQUEST_TIME - 2592000;  // 30 days ago

  // Locate the 'stale' data.
  $result = db_select('node', 'n')
    ->fields('n', array('nid'))
    ->condition('type', 'movie_releases', '=')
    ->condition('changed', $threshold, '<')
    ->orderBy('changed', 'ASC')
    ->range(0, $limit)
    ->execute();

  $nids = $result->fetchCol();
  if (count($nids)) {

    foreach ($nids as $nid) {

      // Published node.
      $node = node_load($nid);

      // Check for a more recent (unpublished) node revision.
      $vid = array_shift(array_keys(node_revision_list($node)));
      if ($vid != $node->vid && !empty($vid)) {
        $node = node_load($nid, $vid);
      }

      $item = field_get_items('node', $node, 'field_mmmovies_api_count');
      $value = field_view_value('node', $node, 'field_mmmovies_api_count', $item[0]);
      $count_old = intval($value['#markup']);

      // Import new data for comparison.
      $data = mmmovies_api_get_releases($node->title);
      $count_new = count($data['response']);

      /**
       * Note: This could easily be upgraded to diff compare the
       * serialized data instead of only testing the count of records.
       */
      if ($count_new && ($count_new != $count_old)) {

        // Create a new node revision with the updated data.
        list($month, $year) = explode('-', $node->title);
        _mmmovies_api_store_movie_releases($data['response'], $month, $year);
        watchdog('mmmovies_api', 'Added new revision to ' . $node->title);

      }
      else {

        /**
         * Only update the node->changed field.
         *
         * Note:
         *   This intentionally bypasses node_save() so that
         *   revisions are NOT created in the moderation queue.
         */
        $node->changed = REQUEST_TIME;
        db_update('node')
          ->fields(array('changed' => $node->changed))
          ->condition('nid', $node->nid)
          ->execute();
      }
    }
  }
}


/**
 * Implements hook_enable().
 */
function mmmovies_api_enable() {
  // Grant permissions to administrator
  $user1 = user_role_load_by_name('administrator');
  user_role_grant_permissions($user1->rid, array_keys(node_list_permissions('movie_releases')));

  // Discover/create the Movie Manager identity.
  $name = variable_get('mmmovies_user_name', 'Mmmovies');

  // Discover/create the Movie Manager role.
  $role_name = 'Movie Manager (mmmovies)';
  if (!$role = user_role_load_by_name($role_name)) {

    // Add a new role
    $role = new stdClass();
    $role->name = $role_name;
    user_role_save($role);

    // Grant permissions to the new role
    $role = user_role_load_by_name($role_name);
    user_role_grant_permissions($role->rid, array_keys(node_list_permissions('movie_releases')));
    user_role_grant_permissions($role->rid, array('access content' ,'administer nodes', 'administer movies releases'));
  }

  // Discover/create the Movie Manager user.
  if (!$user = user_load_by_name($name)) {

    // Add a new user account
    $account = new stdClass();
    $account->is_new = TRUE;
    $edit = array(
      'name' => $name,
      //'status' => 1,
      'roles' => array($role->rid => $role_name),
    );
    user_save($account, $edit);
  }
}


/**
 * Implements hook_permission().
 */
function mmmovies_api_permission() {

  /** NOTE: This permission is assigned to a role but not actually used. **/

  return array(
    'administer movies releases' => array(
      'title' => t('Administer movie releases'),
    ),
  );
}


/**
 * Implements hook_theme().
 */
function mmmovies_api_theme() {
  return array(
    'plax_movie_card' => array(
      'render element' => 'element',
    ),
    'mmmovies_api_releases_request_form' => array(
      'render element' => 'form',
    ),
  );
}


/**
 * Implements hook_menu().
 */
function mmmovies_api_menu() {
  $items['projects'] = array(
    'title' => 'Projects',
    'page callback' => 'mmmovies_api_projects_page',
    'access callback' => TRUE,
    'menu_name' => 'main-menu',
    'expanded' => TRUE,
    'type' => MENU_NORMAL_ITEM,
  );

  $items['projects/mmmovies'] = array(
    'title' => 'Mmmovies',
    'page callback' => 'mmmovies_api_mmmovies_page',
    'access callback' => TRUE,
    'menu_name' => 'main-menu',
    'type' => MENU_NORMAL_ITEM,
  );

  $items['projects/mmmovies_api'] = array(
    'title' => 'Mmmovies API',
    'page callback' => 'mmmovies_api_mmmovies_api_page',
    'access callback' => TRUE,
    'menu_name' => 'main-menu',
    'type' => MENU_NORMAL_ITEM,
  );

  $items['projects/mmmovies/demo'] = array(
    //'title' => 'Demo',
    'page callback' => 'mmmovies_api_mmmovies_demo_page',
    'page arguments' => array(3),
    'access callback' => TRUE,
    'type' => MENU_CALLBACK,
  );

  $items['mmmovies/api/status'] = array(
    'title' => 'API Status',
    'page callback' => 'mmmovies_api_status',
    'access callback' => TRUE,
    'type' => MENU_CALLBACK,
  );

  return $items;
}

/**
 * Custom access callback.
 */
function mmmovies_api_demo_previous_next_access() {
  return (arg(0) == 'prev' || arg(0) == 'next' || (arg(0) == 'mmmovies' && arg(1) == 'demo')) ? TRUE : FALSE;
}

/**
 * Custom page callback.
 */
function mmmovies_api_projects_page() {

  /** NOTE: This is just the parent tab for other submenu items. **/

  return '';
}


/**
 * Custom page callback.
 */
function mmmovies_api_mmmovies_page() {
  // Hide the page title.
  drupal_set_title('');

  $output  = '<p>Mmmovies is a module that will enable easier management of a collection of movie titles.<br />';
  $output .= 'This will be my first contribution to the Drupal community.</p>';
  $output .= '<br />';
  $output .= 'Here is a ' . l('demonstration', 'projects/mmmovies/demo') . '.';

  return $output;
}


/**
 * Custom page callback.
 */
function mmmovies_api_mmmovies_api_page() {
  // Hide the page title.
  drupal_set_title('');

  $output  = '<p>Mmmovies API is a web service hosted on this website.<br />';
  $output .= 'It can be used to locate all the movie releases for a specific month and year.</p>';
  $output .= '<br />';
  $output .= render(drupal_get_form('mmmovies_api_releases_request_form'));

  return $output;
}


/**
 * Build a simple form using Form API.
 */
function mmmovies_api_releases_request_form() {
  $form = array();

  for ($key = 1; $key <=12; $key++) {
    $months[$key] = date('F', strtotime('2000-' . $key));
  }
  $years = drupal_map_assoc(range(1888, date('Y', REQUEST_TIME)));

  $form['month'] = array(
     '#type' => 'select',
     '#title' => t('Month'),
     '#options' => $months,
     '#default_value' => date('n', REQUEST_TIME),
  );

  $form['year'] = array(
     '#type' => 'select',
     '#title' => t('Year'),
     '#options' => $years,
     '#default_value' => date('Y', REQUEST_TIME),
  );

  $form['submit'] = array(
    '#type' => 'submit',
    '#value' => 'View movie releases',
  );

  return $form;
}


/**
 * Theme function for the form.
 */
function theme_mmmovies_api_releases_request_form($variables) {

  if (user_is_logged_in()) {
    $variables['form']['submit']['#prefix'] = '<div class="form-submit-button">';
    $variables['form']['submit']['#suffix'] = '</div>';

    return drupal_render_children($variables['form']);
  }
  else {
    $login = l('login', 'user/login', array('query' => array('destination' => 'projects/mmmovies_api')));
    return 'You need to ' . $login . ' to use this!';
  }
}


/**
 * Form API validate callback.
 */
function mmmovies_api_releases_request_form_validate($form, &$form_state) {
  // NOTE: Nothing to validate here.
}


/**
 * Form API submit callback.
 */
function mmmovies_api_releases_request_form_submit($form, &$form_state) {
  $month = $form_state['values']['month'];
  $month = ($month < 10 ? '0' . $month : $month);
  $year = $form_state['values']['year'];
  $date_full = date('F', strtotime('2000-' . $month . '-01')) . " $year";

  // Check for a valid record in the database.
  $query = "SELECT * FROM {node} WHERE title = :title";
  $result = db_query($query, array(':title' => $month . '-' . $year))->fetchAll();
  if (!empty($result[0])) {
    drupal_goto('mmmovies/api/releases/' . $month . '-' . $year);
  }
  else {

    // Show progress indicator while new data is collected.
    $batch = array(
      'title' => t('Please wait'),
      'operations' => array(
        array('_mmmovies_api_get_releases_batch', array($month, $year)),
      ),
      'progress_message' => t('Locating movie releases for %date', array('%date' => $date_full)),
      'finished' => '_mmmovies_api_get_releases_batch_finished',
    );
    batch_set($batch);
  }
}


/**
 * Display a progress indicator using the Batch API.
 */
function _mmmovies_api_get_releases_batch($month, $year, &$context) {
  $chunk_size = 10;

  if (!isset($context['sandbox']['releases'])) {
    // Gather data from external resource.
    $releases = _mmmovies_api_get_imdb_releases($year, $month);
    $context['sandbox']['releases'] = $releases;
    $context['sandbox']['keys'] = array_keys($releases);
    $context['sandbox']['completed'] = 0;
    $context['sandbox']['total'] = count($releases);
    $chunk_size = 2; // Display progress early on 1st iteration!
  }

  // Trim some refs from the keys stack.
  $refs = array();
  for ($i = 1; $i <= $chunk_size; $i++) {
    if (count($context['sandbox']['keys'])) {
      $refs[] = array_shift($context['sandbox']['keys']);
    }
  }
  foreach ($refs as $imdb_ref) {
    // Get additional movie data from themoviedb.
    $tmdb_data = _mmmovies_api_get_tmdb_releases($imdb_ref);
    $context['sandbox']['releases'][$imdb_ref]['tmdb_data'] = $tmdb_data;
    $context['sandbox']['completed']++;
  }

  // Update Batch API status.
  if ($context['sandbox']['completed'] < $context['sandbox']['total']) {
    $context['finished'] = $context['sandbox']['completed'] / $context['sandbox']['total'];
    //$context['message'] = t('Now processing "%movie"...', array('%movie' => $context['sandbox']['releases'][$imdb_ref]['title']));
  }

  if ($context['finished'] == 1) {
    $context['results'] = $context['sandbox']['releases'];
    $context['results']['date'] = $month . '-' . $year;
  }
}


/**
 * Batch API callback used when the batch run completes.
 */
function _mmmovies_api_get_releases_batch_finished($success, $results, $operations) {

  list($month, $year) = explode('-', $results['date']);
  unset($results['date']);

  // Store a copy of the data.
  if (count($results)) {
    _mmmovies_api_store_movie_releases($results, $month, $year);
  }

  /**
   * Attempt to overwrite browser history so that batch
   * does not re-run when the back button is used to navigate!
   */ 
  //global $base_url;
  //$url = $base_url . '/mmmovies/api/releases/' . $month . '-' . $year;
  //$js = 'window.location.replace(' . $url . ');';
  //drupal_add_js($js, 'inline');

  drupal_goto('mmmovies/api/releases/' . $month . '-' . $year);
}


/**
 * Custom page callback.
 *
 * Displays a basic analysis of the storage statistics.
 */
function mmmovies_api_status() {
  global $user;
  $min_nid = $max_nid = '';
  $count = $total = $timestamp = $max = 0;
  $min   = 999;

  $query = "SELECT nid FROM {node} WHERE type = :type";
  $result = db_query($query, array(':type' => 'movie_releases'))->fetchCol();

  foreach ($result as $nid) {
    $node = node_load($nid);
    $item = field_get_items('node', $node, 'field_mmmovies_api_count');
    $value = field_view_value('node', $node, 'field_mmmovies_api_count', $item[0]);
    $value = intval($value['#markup']);

    $count++;
    $total += $value;
    if ($value < $min) { $min = $value; $min_nid = $nid; }
    if ($value > $max) { $max = $value; $max_nid = $nid; }
    $timestamp = ($node->changed > $timestamp ? $node->changed : $timestamp);
  }

  if (user_access('administer nodes')) {
    // Display links to administrator.
    $min = l($min, "node/$min_nid");
    $max = l($max, "node/$max_nid");
  }

  $header = array('Count', 'Sum', 'Min', 'Max', 'Avg', 'Last Update');
  $rows = array(array($count, $total, $min, $max, round($total / $count), date("j-M-Y, g:i a", $timestamp)));

  return theme('table', array('header' => $header, 'rows' => $rows));;
}


/**
 * Custom page callback.
 */
function mmmovies_api_mmmovies_demo_page($date = '') {
  global $user;
  $build = array();

  if (preg_match('/\d{2}-\d{4}/', $date)) {
    list($month, $year) = explode('-', $date);
    $prev_date = date('m-Y', strtotime("$year-$month-01 - 1 month"));
    $next_date = date('m-Y', strtotime("$year-$month-01 + 1 month"));

    $query = "SELECT * FROM {node} WHERE title = :title";
    $options = array(':title' => $date);

    if (user_access('administer nodes')) {
      $build['links'] = array(
        'prev' => array(
          '#theme' => 'link',
          '#text' => 'Previous',
          '#path' => 'projects/mmmovies/demo/' . $prev_date,
          '#options' => array('attributes' => array('class' => array('quick-link')), 'html' => FALSE),
        ),
        'next' => array(
          '#theme' => 'link',
          '#text' => 'Next',
          '#path' => 'projects/mmmovies/demo/' . $next_date,
          '#options' => array('attributes' => array('class' => array('quick-link')), 'html' => FALSE),
        ),
        '#prefix' => '<div id="demo-page-quick-links">',
        '#suffix' => '</div>',
      );
    }

  }
  else {
    $query = "SELECT * FROM {node} WHERE type = :type ORDER BY RAND() LIMIT 1";
    $options = array(':type' => 'movie_releases');
  }
  $result = db_query($query, $options)->fetchAll();

  if (empty($result[0])) {
    drupal_set_message('No status information is available at the moment.', 'warning');
    return '';
  }

  $node = node_load($result[0]->nid);
  $movies = unserialize($node->body[LANGUAGE_NONE][0]['value']);
  foreach ($movies as $key => $movie) {
    if (empty($movie['tmdb_data']) || empty($movie['tmdb_data']['covers']) || empty($movie['tmdb_data']['posters'])) {
      // Discard any movie that does not include both images.
      unset($movies[$key]);
    }
  }

  // Trim the total movies to nicely fit into 3-column layout.
  $remainder = count($movies) > 9 ? count($movies) % 3 : 0;
  if ($remainder) {
    $movies = array_slice($movies, 0, 0 - $remainder);
  }
  foreach ($movies as $movie) {
    $build[] = _mmmovies_api_build_movie_card($movie);
  }

  $month = date('F', strtotime("2000-" . substr($result[0]->title, 0, 2) . "-01"));
  drupal_set_title(t("Movies released during %month %year", array('%month' => $month, '%year' => substr($result[0]->title, -4))), PASS_THROUGH);

  // Add the intro message.
  /**
  $intro = array(
    '#markup' => '<div class="glass-logo"></div>' .
      '<div class="demo-intro"><span class="demo-title">This is a demo of the Parallax 3D Effect.</span><br />' .
      '<em>hover your mouse pointer over an example below and then move it around to view the simulated 3D effect.</em> ' .
      'This is an innovative front-end UI design with progressive enhancement for compatibility ' .
      'with older browsers and also incorporates a <em>responsive layout</em> which adapts to fit devices with different screen sizes.<br /></div>' ,
    '#prefix' => '<div class="plax-demo">',
    '#suffix' => '</div>',
  );
  array_unshift($build, $intro);
  */

  return $build;
}


/**
 * Private helper function.
 * Generates the markup to display a plaxified movie card.
 */
function _mmmovies_api_build_movie_card($movie) {
  $title = $movie['title'];
  if (strlen($title) > 32) {
    $title = '<h2>' . $movie['title'] . '</h2>';
  }
  else {
    $title = '<h2 class="right">' . $movie['title'] . '</h2>';
  }

  $num_posters = count($movie['tmdb_data']['posters']);
  $poster = $num_posters > 1 ? mt_rand(0 , $num_posters - 1) : 0;

  $num_covers = count($movie['tmdb_data']['covers']);
  $cover = $num_covers > 1 ? mt_rand(0 , $num_covers - 1) : 0;

  $desc = decode_entities($movie['tmdb_data']['overview']);
  //$desc = preg_replace('/&#(\d+);/me',"chr(\\1)",$desc);            #decimal notation
  //$desc = preg_replace('/&#x([a-f0-9]+);/mei',"chr(0x\\1)",$desc);  #hex notation
  if (strlen($desc) > 190) {
    $trimmed = substr($movie['tmdb_data']['overview'], 0, 190);
    $trimmed = substr($trimmed, 0, strrpos($trimmed, ' '));
    $trimmed = preg_replace('/[^a-zA-Z]$/', '', $trimmed);
    $desc = '<p>' . $trimmed . '...</p>';
  }
  else {
    $desc = '<p>' . $movie['tmdb_data']['overview'] . '</p>';
  }

  $certificate = '--';
  if (!empty($movie['imdb_data']['certificate'])) {
    $certificate = preg_replace('/_/', '-', $movie['imdb_data']['certificate']);
  }
  if ($certificate == '--' && !empty($movie['tmdb_data']['certification'])) {
    $certificate = $movie['tmdb_data']['certification'];
  }

  $runtime = '--';
  if (!empty($movie['imdb_data']['runtime'])) {
    $runtime = 0 + $movie['imdb_data']['runtime'];
  }
  if ($runtime == '--' && !empty($movie['tmdb_data']['runtime'])) {
    $runtime = $movie['tmdb_data']['runtime'];
  }

  $box_office = '--';
  if (!empty($movie['imdb_data']['box_office'])) {
    $box_office = sprintf("%1.1f", $movie['imdb_data']['box_office'] / 1000000);
  }
  $box_office = ($box_office > 0) ? '$<span class="cash">' . $box_office . '</span>M' :
    '< $<span class="cash">100</span>K';

  $genre = !empty($movie['imdb_data']['genre']) ? $movie['imdb_data']['genre'] : '';
  if (!empty($genre)) {
    $genre = '<span class="genre-label">Genre: </span><em>' . $genre;
  }

  return array(
    'title'   => $title,
    'poster'  => '<img src="' . $movie['tmdb_data']['posters'][$poster] . '" />',
    'cover'   => '<img src="' . $movie['tmdb_data']['covers'][$cover] . '" />',
    'desc'    => $desc,
    'rated'   => $certificate,
    'runtime' => $runtime,
    'box_office' => $box_office,
    'cast'    => preg_replace('/, /', '<br />', $movie['imdb_data']['cast']),
    'genre'   => $genre,

    '#theme' => 'plax_movie_card',
  );
}


/**
 * Custom theme function.
 */
function theme_plax_movie_card($variables) {
  $cert_label = strlen($variables['element']['rated']) < 7 ? 'Rated ' : '';

  $output  = '<div class="plax-container">' .
    '<div class="plax-background-layer-1"></div>' .
    '<div class="plax-background-layer-2">' . $variables['element']['poster'] . '</div>' .
    '<div class="plax-content-layer-1">'  . $variables['element']['title'] . '</div>' .
    '<div class="plax-content-layer-2">' . $variables['element']['cover'] . '</div>' .
    '<div class="plax-content-layer-3">' .
      '<div class="movie-details">' . $variables['element']['desc']  .
        '<div class="cast">' . $variables['element']['cast'] . '</div>' .
        '<div class="movie-stats-1">' .
          '<div class="rating">' . $cert_label . '<span class="cert">' . $variables['element']['rated'] . '</span></div>' .
          '<div class="runtime">' . $variables['element']['runtime'] . ' mins</div>' .
          '<div class="box-office">' . $variables['element']['box_office'] . '</div>' .
        '</div>' .
        '<div class="genre">' . $variables['element']['genre'] . '</em></div>' .
      '</div>' .
    '</div>';
  $output .= '</div>';

  return $output;
}


/**
 * Implements hook_ctools_plugin_api().
 *
 * This just lets services know that we are defining an endpoint in code.
 */
function mmmovies_api_ctools_plugin_api($owner, $api) {
  if ($owner == 'services' && $api == 'services') {
    return array(
      'version' => 3,
    );
  }
}


/**
 * Implements hook_default_services_endpoint().
 *
 * Defines the endpoint.
 */
function mmmovies_api_default_services_endpoint() {
  $export = array();

  $endpoint = new stdClass();
  $endpoint->disabled = FALSE; /* Edit this to true to make a default endpoint disabled initially */
  $endpoint->api_version = 3;
  $endpoint->name = 'mmmovies_api';
  $endpoint->server = 'rest_server';
  $endpoint->path = 'mmmovies/api';
  $endpoint->authentication = array();
  $endpoint->server_settings = array(
    'formatters' => array(
      'json' => TRUE,
      'bencode' => FALSE,
      'jsonp' => FALSE,
      'php' => FALSE,
      'rss' => FALSE,
      'xml' => FALSE,
    ),
    'parsers' => array(
      'application/json' => TRUE,
      'application/vnd.php.serialized' => TRUE,
      'application/x-www-form-urlencoded' => TRUE,
      'multipart/form-data' => TRUE,
    ),
  );
  $endpoint->resources = array(
    'releases' => array(
      'alias' => 'releases',
      'operations' => array(
        'retrieve' => array(
          'enabled' => 1,
        ),
      ),
    ),
  );
  $endpoint->debug = 0;
  $export['mmmovies_api'] = $endpoint;

  return $export;
}


/**
 * Implements hook_services_resources().
 */
function mmmovies_api_services_resources() {
  return array(
    'releases' => array(
      'retrieve' => array(
        'help' => 'Get movie releases',
        'callback' => 'mmmovies_api_get_releases',
        'access callback' => '_mmmovies_api_resource_access',
        'args' => array(
          array(
            'name' => 'date',
            'type' => 'string',
            'description' => 'Date (format: MM-YYYY)',
            'source' => array('path' => '0'),
            'optional' => FALSE,
            'default value' => '0',
          ),
        ),
      ),
    ),
  );
}


/**
 * Private helper function.
 * Grants access to the web services resource.
 */
function _mmmovies_api_resource_access() {

  // Validate only for logged-in users.
  return user_is_logged_in();

  // Validate for everyone.
  //return TRUE;
}


/**
 * Custom callback function.
 * Discovers movie releases during a given date (month-year).
 *
 * @return
 *   An associative array of movies keyed by reference.
 */
function mmmovies_api_get_releases($date) {
  $releases = array();

  // Validate the input parameter.
  if (!preg_match('/\d{2}-\d{4}/', $date)) {
    return array(
      'status' => 'ERROR',
      'response' => t('Date parameter is invalid - please provide a date with the format MM-YYYY'),
    );
  }
  else {
    $month = substr($date, 0, 2);
    $year  = substr($date, 3, 4);
  }
  if (empty($month) || $month < 1 || $month > 12 || empty($year) || $year < 1888 || $year > date('Y')) {
    return array(
      'status' => 'ERROR',
      'response' => t('Date parameter is invalid - dates before 1888 and dates in the future are not allowed'),
    );
  }

  // Check for a valid record in the database.
  $query = "SELECT * FROM {node} WHERE title = :title";
  $result = db_query($query, array(':title' => $month . '-' . $year))->fetchAll();
  if (!empty($result[0])) {
    $node = node_load($result[0]->nid);
    $releases = unserialize($node->body[LANGUAGE_NONE][0]['value']);
  }
  else {

    // Gather data from external resources.
    $releases = _mmmovies_api_get_imdb_releases($year, $month);
    foreach (array_keys($releases) as $imdb_ref) {
      // Get additional movie data from themoviedb.
      $releases[$imdb_ref]['tmdb_data'] = _mmmovies_api_get_tmdb_releases($imdb_ref);
    }

    // Store a copy of the data.
    if (count($releases)) {
      _mmmovies_api_store_movie_releases($releases, $month, $year);
    }
  }

  // Return the data.
  if (count($releases)) {
    return array(
      'status' => 'OK',
      'response' => $releases,
    );
  }
  else {
    $error_month = date('F', strtotime("2000-$month-01"));
    return array(
      'status' => 'ERROR',
      'response' => t("There are no releases for $error_month $year"),
    );
  }
}


/**
 * Private helper function.
 */
function _mmmovies_api_get_imdb_releases($year, $month) {
  $releases = array();

  // Query imdb's advanced search.
  $imdb_adv_search_params = array(
    'boxoffice_gross_us=1,',
    'count=100',
    "release_date=$year-$month,$year-$month",
    'sort=boxoffice_gross_us,desc',
    'title_type=feature',
  );
  $url = 'http://www.imdb.com/search/title?' . implode('&', $imdb_adv_search_params);
  $request = drupal_http_request($url);

  if (!empty($request->data) && $request->code == 200) {
    preg_match_all('/<tr class="(?:odd|even) detailed">.*?<\/tr>/s', $request->data, $rows);

    foreach ($rows[0] as $row) {
      $fields = array();
      $regex_to_scrape_fields = array(
        'imdb_ref' => '<a href="\/title\/(tt\d+)\/',
        'image' => '<a href="\/title\/tt.*?<img src="(.*?)"',
        'title' => '<td class="title">.*?<a href="\/title\/tt.*?>(.*?)<\/a>',
        'year' => '<span class="year_type">\((\d{4})\)<\/span>',
        'user_rating' => '<span class="rating-rating"><span class="value">(.*?)<\/span>',
        'user_votes' => '<div class="rating rating-list".*?\((.*?) votes',
        //'short_plot' => '<span class="outline">(.*?)<\/span>',
        'director' => '<span class="credit">\s+Dir: <a href="\/name\/nm.*?">(.*?)<\/a>',
        'cast' => '<span class="credit">.*?With: (<a href="\/name\/nm.*?">.*?)<\/span>',
        'genre' => '<span class="genre">(<a href="\/genre\/.*?">.*?)<\/span>',
        'certificate' => '<span class="certificate">.*?title="(.*?)"',
        'runtime' => '<span class="runtime">(\d+) mins\.<\/span>',
        'box_office' => '<td class="sort_col">\$(.*?)(M|K)*<\/td>',
      );

      foreach ($regex_to_scrape_fields as $key => $regex) {
        preg_match_all("/$regex/s", $row, $matches);
        if (!empty($matches[1][0])) {
          switch ($key) {
            case 'title':
              $fields[$key] = decode_entities($matches[1][0]);
              break;
            case 'cast':
              $fields[$key] = decode_entities($matches[1][0]);
              $fields[$key] = strip_tags($fields[$key]);
              $fields[$key] = preg_replace('/\\n/', '', $fields[$key]);
              break;
            case 'genre':
              $fields[$key] = strip_tags($matches[1][0]);
              $fields[$key] = preg_replace('/ \| /', ', ', $fields[$key]);
              break;
            case 'user_votes':
              $fields[$key] = preg_replace('/,/', '', $matches[1][0]);
              break;
            case 'box_office':
              $multiplier = (!empty($matches[2][0]) ? ($matches[2][0] == 'M' ? 1000000 : 1000) : 1);
              $fields[$key] = $matches[1][0] * $multiplier;
              break;
            default:
              $fields[$key] = $matches[1][0];
          }
        }
        unset($matches);
      }

      $imdb_ref = $fields['imdb_ref'];
      unset($fields['imdb_ref']);
      $releases[$imdb_ref]['title'] = $fields['title'];
      $releases[$imdb_ref]['imdb_data'] = $fields;
    }
  }

  return $releases;
}


/**
 * Private helper function.
 */
function _mmmovies_api_get_tmdb_releases($imdb_ref) {
  $api_key = '###';  /** add api key from your account here (https://www.themoviedb.org/account/signup) **/

  $url = "http://api.themoviedb.org/2.1/Movie.imdbLookup/en/json/$api_key/$imdb_ref";
  $request = drupal_http_request($url);

  if (!empty($request->data) && $request->code == 200) {
    $tmdb_data = json_decode($request->data);
    $tmdb_data = (array)$tmdb_data[0];

    // Select a subset of the poster images.
    $covers  = array();
    $last_id = '';
    if (isset($tmdb_data['posters'])) {
      foreach ($tmdb_data['posters'] as $key => $image_obj) {
        if ($image_obj->image->size == 'thumb' && $image_obj->image->id != $last_id) {
          $covers[] = $image_obj->image->url;
          $last_id = $image_obj->image->id;
        }
        else {
          continue;
        }
      }

      // Rebuild data array including the selected cover images.
      unset($tmdb_data['posters']);
      $tmdb_data['covers'] = $covers;
    }

    // Select a subset of the backdrop images.
    $posters = array();
    $last_id = '';
    if (isset($tmdb_data['backdrops'])) {
      foreach ($tmdb_data['backdrops'] as $key => $image_obj) {
        if ($image_obj->image->size == 'thumb' && $image_obj->image->id != $last_id) {
          $posters[] = $image_obj->image->url;
          $last_id = $image_obj->image->id;
        }
        else {
          continue;
        }
      }

      // Rebuild data array including the selected poster images.
      unset($tmdb_data['backdrops']);
      $tmdb_data['posters'] = $posters;
    }
  }

  return !empty($tmdb_data) ? $tmdb_data : array();
}


/**
 * Private helper function.
 */
function _mmmovies_api_store_movie_releases($releases, $month, $year) {
  $user_name = variable_get('mmmovies_user_name', 'Mmmovies');
  $user = user_load_by_name($user_name);
  $count = count($releases);
  $lang = LANGUAGE_NONE;

  $query = "SELECT * FROM {node} WHERE title = :title";
  $result = db_query($query, array(':title' => $month . '-' . $year))->fetchAll();

  if (!empty($result[0])) {

    $count = count($releases);

    // Update existing node with new revision.
    $node = node_load($result[0]->nid);
    $node->field_mmmovies_api_count[$lang][0]['value'] = $count;
    $node->body[$lang][0]['value'] = serialize($releases);
    $node->revision = 1;
    $node->log = "New data imported for $count movie releases.";
    //$node->changed = REQUEST_TIME;
    node_save($node);
  }
  else {

    // Create a new node.
    $node = new stdClass();
    $node->type = "movie_releases";
    $node->language = $lang;
    $node->title = $month . '-' . $year;
    $node->uid = $user->uid;
    $node->field_mmmovies_api_count[$lang][0]['value'] = $count;
    $node->body[$lang][0]['value'] = serialize($releases);
    node_save($node);
  }
}


/**
 * Implements hook_node_view_alter().
 */
function mmmovies_api_node_view_alter(&$build) {
  if ($build['#bundle'] == 'movie_releases') {
    // Hide the serialized data (in the body field).
    $build['body']['#access'] = FALSE;
  }
}


/**
 * Implements hook_form_alter().
 */
function mmmovies_api_form_alter(&$form, &$form_state, $form_id) {
  if ($form_id == 'movie_releases_node_form') {
    // Protect serialized data from user modification.
    $form['body']['#disabled'] = TRUE;
  }
}


/**
 * Implements hook_preprocess_node().
 */
function mmmovies_api_preprocess_node(&$variables) {
  if ($variables['type'] == 'movie_releases') {
    // Disable display of 'Submitted by' information
    $variables['display_submitted'] = FALSE;
  }
}