<?php
/**
 * @file
 * An AddThis-class.
 */

class AddThis {

  const BLOCK_NAME = 'addthis_block';
  const DEFAULT_CUSTOM_CONFIGURATION_CODE = 'var addthis_config = {}';
  const DEFAULT_FORMATTER = 'addthis_default_formatter';
  const DEFAULT_NUMBER_OF_PREFERRED_SERVICES = 4;
  const FIELD_TYPE = 'addthis';
  const MODULE_NAME = 'addthis';
  const PERMISSION_ADMINISTER_ADDTHIS = 'administer addthis';
  const PERMISSION_ADMINISTER_ADVANCED_ADDTHIS = 'administer advanced addthis';
  const STYLE_KEY = 'addthis_style';
  const WIDGET_TYPE = 'addthis_button_widget';

  // AddThis attribute and parameter names (as defined in AddThis APIs)
  const PROFILE_ID_QUERY_PARAMETER = 'pubid';
  const TITLE_ATTRIBUTE = 'addthis:title';
  const URL_ATTRIBUTE = 'addthis:url';

  // Persistent variable keys
  const ADDRESSBOOK_ENABLED_KEY = 'addthis_addressbook_enabled';
  const BLOCK_WIDGET_TYPE_KEY = 'addthis_block_widget_type';
  const BOOKMARK_URL_KEY = 'addthis_bookmark_url';
  const CLICKBACK_TRACKING_ENABLED_KEY = 'addthis_clickback_tracking_enabled';
  const CLICK_TO_OPEN_COMPACT_MENU_ENABLED_KEY = 'addthis_click_to_open_compact_menu_enabled';
  const CO_BRAND_KEY = 'addthis_co_brand';
  const COMPLIANT_508_KEY = 'addthis_508_compliant';
  const CUSTOM_CONFIGURATION_CODE_ENABLED_KEY = 'addthis_custom_configuration_code_enabled';
  const CUSTOM_CONFIGURATION_CODE_KEY = 'addthis_custom_configuration_code';
  const ENABLED_SERVICES_KEY = 'addthis_enabled_services';
  const GOOGLE_ANALYTICS_TRACKING_ENABLED_KEY = 'addthis_google_analytics_tracking_enabled';
  const GOOGLE_ANALYTICS_SOCIAL_TRACKING_ENABLED_KEY = 'addthis_google_analytics_social_tracking_enabled';
  const FACEBOOK_LIKE_COUNT_SUPPORT_ENABLED = 'addthis_facebook_like_count_support_enabled';
  const OPEN_WINDOWS_ENABLED_KEY = 'addthis_open_windows_enabled';
  const PROFILE_ID_KEY = 'addthis_profile_id';
  const SERVICES_CSS_URL_KEY = 'addthis_services_css_url';
  const SERVICES_JSON_URL_KEY = 'addthis_services_json_url';
  const STANDARD_CSS_ENABLED_KEY = 'addthis_standard_css_enabled';
  const UI_DELAY_KEY = 'addthis_ui_delay';
  const UI_HEADER_BACKGROUND_COLOR_KEY = 'addthis_ui_header_background_color';
  const UI_HEADER_COLOR_KEY = 'addthis_ui_header_color';
  const WIDGET_JS_URL_KEY = 'addthis_widget_js_url';
  const WIDGET_JS_ASYNC = 'addthis_widget_async';

  // Twitter
  const TWITTER_VIA_KEY = 'addthis_twitter_via';
  const TWITTER_VIA_DEFAULT = 'AddThis';
  const TWITTER_TEMPLATE_KEY = 'addthis_twitter_template';
  const TWITTER_TEMPLATE_DEFAULT = '{{title}} {{url}} via @AddThis';

  // External resources
  const DEFAULT_BOOKMARK_URL = 'http://www.addthis.com/bookmark.php?v=250';
  const DEFAULT_SERVICES_CSS_URL = 'http://cache.addthiscdn.com/icons/v1/sprites/services.css';
  const DEFAULT_SERVICES_JSON_URL = 'http://cache.addthiscdn.com/services/v1/sharing.en.json';
  const DEFAULT_WIDGET_JS_URL = 'http://s7.addthis.com/js/250/addthis_widget.js';
  const DEFAULT_WIDGET_JS_ASYNC = TRUE;

  // Internal resources
  const ADMIN_CSS_FILE = 'addthis.admin.css';
  const ADMIN_INCLUDE_FILE = 'includes/addthis.admin.inc';

  // Widget types
  const WIDGET_TYPE_DISABLED = 'addthis_disabled';

  // Styles
  const CSS_32x32 = 'addthis_32x32_style';

  private static $instance;

  /* @var AddThisJson */
  private $json;

  /**
   * @return AddThis
   */
  public static function getInstance() {
    if (!isset(self::$instance)) {
      $addThis = new AddThis();
      $addThis->setJson(new AddThisJson());
      self::$instance = $addThis;
    }
    return self::$instance;
  }

  public function setJson(AddThisJson $json) {
    $this->json = $json;
  }

  public function getDefaultFormatterTypes() {
    return array(
      self::WIDGET_TYPE_DISABLED => t('Disabled'),
    );
    // @todo Get all display types available and
    // provide a array with their names.
  }

  public function getDisplayTypes() {
    $displays = array();
    foreach ($display_impl = _addthis_field_info_formatter_field_type() as $key => $display) {
      $displays[$key] = t(check_plain($display['label']));
    }
    return $displays;
  }

  /*
   * Get markup for a given display type.
   *
   * When $options does not contain #entity, link to the current URL.
   * When $options does not contain #display, use default settings.
   */
  public function getDisplayMarkup($display, $options = array()) {
    if (empty($display)) {
      return array();
    }

    $formatters = _addthis_field_info_formatter_field_type();

    if (!array_key_exists($display, $formatters)) {
      return array();
    }

    // The display type exists. Now get it and get the markup.
    $display_information = $formatters[$display];

    // Theme function might only give a display name and
    // render on default implementation.
    if (!isset($options['#display']) || $options['#display']['type'] != $display) {
      $options['#display'] = $display_information;
    }

    // When #entity and #entity_type exist, use the entity's URL.
    if (isset($options['#entity']) && isset($options['#entity_type'])) {
      $uri = entity_uri($options['#entity_type'], $options['#entity']);
      $uri['options'] += array(
        'absolute' => TRUE,
      );

      // @todo Add a hook to alter the uri also based on fields from the
      // entity (such as custom share link). Pass $options and $uri. Return
      // a uri object to which we can reset it. Maybe use the alter structure.

      $options['#url'] = url($uri['path'], $uri['options']);
    }
    // @todo Hash the options array and cache the markup.
    // This will save all the extra calls to modules and alters.

    // Allow other modules to alter markup options.
    drupal_alter('addthis_markup_options', $options);

    $markup = array(
      '#display' => $options['#display'],
    );
    // Get all hook implementation to verify later if we can call it.
    $addthis_display_markup_implementations = module_implements('addthis_display_markup');

    // Look for a targeted implementation to call.
    // This should be the default implementation that is called.
    if (function_exists($display_information['module'] . '_addthis_display_markup__' . $display)) {
      $markup += call_user_func_array($display_information['module'] . '_addthis_display_markup__' . $display, array($options));
    } elseif (in_array($display_information['module'], $addthis_display_markup_implementations)) {
      $markup += module_invoke($display_information['module'], 'addthis_display_markup', $display, $options);
    }
    // Allow other modules to alter markup.
    drupal_alter('addthis_markup', $markup);
    return $markup;
  }

  public function getServices() {
    $rows = array();
    $services = $this->json->decode($this->getServicesJsonUrl());
    if (empty($services)) {
      drupal_set_message(t('AddThis services could not be loaded from ' . $this->getServicesJsonUrl()), 'warning');
    }
    else {
      foreach ($services['data'] as $service) {
        $serviceCode = check_plain($service['code']);
        $serviceName = check_plain($service['name']);
        $rows[$serviceCode] = '<span class="addthis_service_icon icon_' . $serviceCode . '"></span> ' . $serviceName;
      }
    }
    return $rows;
  }

  public function addWidgetJs() {
    $async_parameter = self::isWidgetJsAsync() ? '?async=1' : '';
    $url = self::getWidgetUrl() . $async_parameter;
    if (self::isWidgetJsAsync()) {
      drupal_add_js(
        array(
        'addthis' => array(
          'widget_url' => $url,
        ),
      ),
        'setting'
      );
    }
    else {
      // Add AddThis.com resources
      drupal_add_js(
        $url,
        array(
        'type' => 'external',
        'group' => JS_LIBRARY,
        'every_page' => TRUE,
        'weight' => 9,
      )
      );
    }
    // Add local internal behaviours
    if (self::isWidgetJsAsync()) {
      drupal_add_js(
        drupal_get_path('module', 'addthis') . '/addthis.js',
        array(
        'group' => JS_DEFAULT,
        'weight' => 10,
        'every_page' => TRUE,
        'preprocess' => TRUE,
      )
      );
    }
  }

  public function addConfigurationOptionsJs() {
    if ($this->isCustomConfigurationCodeEnabled()) {
      $configurationOptionsJavascript = $this->getCustomConfigurationCode();
    }
    else {
      $enabledServices = $this->getServiceNamesAsCommaSeparatedString() . 'more';

      global $language;
      $configuration = array(
        'services_compact' => $enabledServices,
        'data_track_clickback' => $this->isClickbackTrackingEnabled(),
        'ui_508_compliant' => $this->get508Compliant(),
        'ui_click' => $this->isClickToOpenCompactMenuEnabled(),
        'ui_cobrand' => $this->getCoBrand(),
        'ui_delay' => $this->getUiDelay(),
        'ui_header_background' => $this->getUiHeaderBackgroundColor(),
        'ui_header_color' => $this->getUiHeaderColor(),
        'ui_open_windows' => $this->isOpenWindowsEnabled(),
        'ui_use_css' => $this->isStandardCssEnabled(),
        'ui_use_addressbook' => $this->isAddressbookEnabled(),
        'ui_language' => $language->language,
      );
      if (module_exists('googleanalytics')) {
        if ($this->isGoogleAnalyticsTrackingEnabled()) {
          $configuration['data_ga_property'] = variable_get('googleanalytics_account', '');
          $configuration['data_ga_social'] = $this->isGoogleAnalyticsSocialTrackingEnabled();
        }
      }
      $configuration['templates']['twitter'] = $this->getTwitterTemplate();
      drupal_alter('addthis_configuration', $configuration);

      $templates = array('templates' => $configuration['templates']);
      unset($configuration['templates']);
      $configurationOptionsJavascript = 'var addthis_config = ' . drupal_json_encode($configuration) . "\n";
      $configurationOptionsJavascript .= 'var addthis_share = ' . drupal_json_encode($templates);
    }
    drupal_add_js(
      $configurationOptionsJavascript,
      array(
      'type' => 'inline',
      'scope' => 'footer',
      'every_page' => TRUE,
    )
    );
  }

  public function getAddThisAttributesMarkup($options) {
    if (isset($options)) {
      $attributes = array();

      if (isset($options['#entity'])) {
        $attributes += $this->getAttributeTitle($options['#entity']);
      }
      $attributes += $this->getAttributeUrl($options);

      return $attributes;
    }
    return array();
  }

  public function getBlockDisplayType() {
    return variable_get(self::BLOCK_WIDGET_TYPE_KEY, self::WIDGET_TYPE_DISABLED);
  }

  public function getProfileId() {
    return check_plain(variable_get(AddThis::PROFILE_ID_KEY));
  }

  public function getServicesCssUrl() {
    return check_url(variable_get(AddThis::SERVICES_CSS_URL_KEY, self::DEFAULT_SERVICES_CSS_URL));
  }

  public function getServicesJsonUrl() {
    return check_url(variable_get(AddThis::SERVICES_JSON_URL_KEY, self::DEFAULT_SERVICES_JSON_URL));
  }

  public function getEnabledServices() {
    return variable_get(self::ENABLED_SERVICES_KEY, array());
  }

  public function isWidgetJsAsync() {
    return variable_get(self::WIDGET_JS_ASYNC, self::DEFAULT_WIDGET_JS_ASYNC);
  }

  public function isClickToOpenCompactMenuEnabled() {
    return (boolean) variable_get(self::CLICK_TO_OPEN_COMPACT_MENU_ENABLED_KEY, FALSE);
  }

  public function isOpenWindowsEnabled() {
    return (boolean) variable_get(self::OPEN_WINDOWS_ENABLED_KEY, FALSE);
  }

  public function getUiDelay() {
    return (int) check_plain(variable_get(self::UI_DELAY_KEY));
  }

  public function getUiHeaderColor() {
    return check_plain(variable_get(self::UI_HEADER_COLOR_KEY));
  }

  public function getUiHeaderBackgroundColor() {
    return check_plain(variable_get(self::UI_HEADER_BACKGROUND_COLOR_KEY));
  }

  public function isStandardCssEnabled() {
    return (boolean) variable_get(self::STANDARD_CSS_ENABLED_KEY, TRUE);
  }

  public function getCustomConfigurationCode() {
    return variable_get(self::CUSTOM_CONFIGURATION_CODE_KEY, self::DEFAULT_CUSTOM_CONFIGURATION_CODE);
  }

  public function isCustomConfigurationCodeEnabled() {
    return (boolean) variable_get(self::CUSTOM_CONFIGURATION_CODE_ENABLED_KEY, FALSE);
  }

  public function getBaseWidgetJsUrl() {
    return check_url(variable_get(self::WIDGET_JS_URL_KEY, self::DEFAULT_WIDGET_JS_URL));
  }

  public function getBaseBookmarkUrl() {
    return check_url(variable_get(self::BOOKMARK_URL_KEY, self::DEFAULT_BOOKMARK_URL));
  }

  public function getCoBrand() {
    return variable_get(self::CO_BRAND_KEY, '');
  }

  public function get508Compliant() {
    return (boolean) variable_get(self::COMPLIANT_508_KEY, FALSE);
  }

  public function getTwitterVia() {
    return variable_get(self::TWITTER_VIA_KEY, self::TWITTER_VIA_DEFAULT);
  }

  public function getTwitterTemplate() {
    return variable_get(self::TWITTER_TEMPLATE_KEY, self::TWITTER_TEMPLATE_DEFAULT);
  }

  public function isClickbackTrackingEnabled() {
    return (boolean) variable_get(self::CLICKBACK_TRACKING_ENABLED_KEY, FALSE);
  }

  public function isAddressbookEnabled() {
    return (boolean) variable_get(self::ADDRESSBOOK_ENABLED_KEY, FALSE);
  }

  public function isGoogleAnalyticsTrackingEnabled() {
    return (boolean) variable_get(self::GOOGLE_ANALYTICS_TRACKING_ENABLED_KEY, FALSE);
  }

  public function isGoogleAnalyticsSocialTrackingEnabled() {
    return (boolean) variable_get(self::GOOGLE_ANALYTICS_SOCIAL_TRACKING_ENABLED_KEY, FALSE);
  }

  public function isFacebookLikeCountSupportEnabled() {
    return (boolean) variable_get(self::FACEBOOK_LIKE_COUNT_SUPPORT_ENABLED, TRUE);
  }

  public function addStylesheets() {
    drupal_add_css($this->getServicesCssUrl(), 'external');
    drupal_add_css($this->getAdminCssFilePath(), 'file');
  }

  public function getFullBookmarkUrl() {
    return $this->getBaseBookmarkUrl() . $this->getProfileIdQueryParameterPrefixedWithAmp();
  }

  private function getAttributeTitle($entity) {
    if (isset($entity->title)) {
      return array(
        self::TITLE_ATTRIBUTE => (check_plain($entity->title)  . ' - ' . variable_get('site_name')),
      );
    }
    return array();
  }

  private function getAttributeUrl($options) {
    if (isset($options['#url'])) {
      return array(
        self::URL_ATTRIBUTE => $options['#url'],
      );
    }
    return array();
  }

  private function getServiceNamesAsCommaSeparatedString() {
    $enabledServiceNames = array_values($this->getEnabledServices());
    $enabledServicesAsCommaSeparatedString = '';
    foreach ($enabledServiceNames as $enabledServiceName) {
      if ($enabledServiceName != '0') {
        $enabledServicesAsCommaSeparatedString .= $enabledServiceName . ',';
      }
    }
    return $enabledServicesAsCommaSeparatedString;
  }

  private function getAdminCssFilePath() {
    return drupal_get_path('module', self::MODULE_NAME) . '/' . self::ADMIN_CSS_FILE;
  }

  private function getProfileIdQueryParameter($prefix) {
    $profileId = $this->getProfileId();
    return !empty($profileId) ? $prefix . self::PROFILE_ID_QUERY_PARAMETER . '=' . $profileId : '';
  }

  private function getProfileIdQueryParameterPrefixedWithAmp() {
    return $this->getProfileIdQueryParameter('&');
  }

  private function getProfileIdQueryParameterPrefixedWithHash() {
    return $this->getProfileIdQueryParameter('#');
  }

  private function getWidgetUrl() {
    return check_url($this->getBaseWidgetJsUrl() . $this->getProfileIdQueryParameterPrefixedWithHash());
  }
}