<?php

/**
 * @file
 * GroupDocs module.
 */

/**
 * Implements hook_menu().
 *
 * groupdocs_viewer/config - config page with api private and public keys
 * groupdocs_viewer/upload_file - file uploading form for iframe
 */
function groupdocs_viewer_menu() {
  $items = array();

  $items['admin/groupdocs_viewer/config'] = array(
    'title' => 'GD Viewer',
    'description' => 'Configuration for groupdocs_viewer module. Allow you to set Client ID and API Key. You can find them in your GroupDocs account.',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('groupdocs_viewer_config_form'),
    'access arguments' => array('administer site configuration'),
    'type' => MENU_NORMAL_ITEM,
  );

  $items['groupdocs_viewer/upload_file'] = array(
    'title' => 'Groupdocs uploading',
    'description' => 'Groupdocs uploading',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('groupdocs_viewer_uploading_form'),
    'access arguments' => array('access administration pages'),
    'file' => 'groupdocs_viewer.admin.inc',
    'type' => MENU_CALLBACK,
  );

  $items['groupdocs_viewer/treeviewer'] = array(
    'title' => 'Groupdocs treeviewer',
    'description' => 'Groupdocs treeviewer',
    'page callback' => 'groupdocs_viewer_treeviewer_page',
    'page arguments' => array(''),
    'access arguments' => array('access administration pages'),
    'file' => 'groupdocs_viewer.admin.inc',
    'type' => MENU_CALLBACK,
  );

  return $items;
}
/**
 * Implements hook_page_alter().
 *
 * To remove admin toolbar on iframe page
 */
function groupdocs_viewer_page_alter(&$page) {
  if (strpos(request_uri(), '/groupdocs_viewer/upload_file/') !== false) {
    unset($page['page_top']['toolbar']);
  }
}

/**
 * Implements hook_theme_registry_alter().
 */
function groupdocs_viewer_theme_registry_alter(&$theme_registry) {
  $mod_path = drupal_get_path('module', 'groupdocs_viewer') . '/templates';
  $theme_registry_copy = $theme_registry;
  _theme_process_registry($theme_registry_copy, 'phptemplate', 'theme_engine', 'pow', $mod_path);
  $theme_registry += array_diff_key($theme_registry_copy, $theme_registry);
  $hooks = array('node');
  foreach ($hooks as $h) {
    _groupdocs_viewer_insert_after_first_element($theme_registry[$h]['theme paths'], $mod_path);
  }
}

/**
 * Helper function for re-ordering arrays (needed by theme_registry_alter).
 */
function _groupdocs_viewer_insert_after_first_element(&$a, $element) {
  if (is_array($a)) {
    $first_element = array_shift($a);
    array_unshift($a, $first_element, $element);
  }
}

/**
 * Form constructor for the module config form.
 *
 * Page arguments: Current posts settings
 *
 * @see groupdocs_viewer_menu()
 */
function groupdocs_viewer_config_form($form, &$form_state) {

  $form = array();

  $form['groupdocs_client_login'] = array(
    '#type' => 'textfield',
    '#title' => t('Client Login'),
    '#default_value' => variable_get('groupdocs_client_login'),
    '#size' => 32,
    '#maxlength' => 32,
    '#description' => t("Public Client Login needed to get access to the GroupDocs API."),
    '#required' => TRUE,
  );

  $form['groupdocs_client_password'] = array(
    '#type' => 'password',
    '#title' => t('Client Password'),
    '#default_value' => variable_get('groupdocs_client_password'),
    '#size' => 32,
    '#maxlength' => 32,
    '#description' => t("A combination of public Client Login and private Client Password give you access to the GroupDocs API."),
    '#required' => TRUE,
  );

  return system_settings_form($form);
}

/**
 * Implements hook_field_info().
 *
 * Provides the description of the field.
 */
function groupdocs_viewer_field_info() {
  return array(
    // We name our field as the associative name of the array.
    'groupdocs_embedded_code' => array(
      'label' => t('GD Viewer'),
      'description' => t('Add embedded documents to your Drupal nodes.'),
      'default_widget' => 'groupdocs_file_uploading',
      'default_formatter' => 'groupdocs_iframe',
    ),
  );
}

/**
 * Implements hook_field_formatter_info().
 *
 * This formatter just displays groupdocs iframe
 *
 * @see groupdocs_viewer_field_formatter_view()
 */
function groupdocs_viewer_field_formatter_info() {
  return array(
    'groupdocs_iframe' => array(
      'label' => t('Embedded Groupdocs viewer'),
      'field types' => array('groupdocs_embedded_code'),
    ),
  );
}

/**
 * Implements hook_field_formatter_view().
 *
 * Renders the ouput of an 'Embedded Groupdocs viewer'
 * formatted field within an iframe that
 * pulls in the Groupdocs viewer to display the file inline.
 */
function groupdocs_viewer_field_formatter_view($entity_type, $entity, $field, $instance, $langcode, $items, $display) {

  $element = array();
  switch ($display['type']) {
    // This formatter outputs the field within an iframe.
    case 'groupdocs_iframe':
      foreach ($items as $delta => $item) {
        $guid = $item['groupdocs_embedded_code'];
        $cms_version = '7.17';
        $element[$delta]['#markup'] = "<iframe src='https://apps.groupdocs.com/document-viewer/embed/$guid?&referer=drupal/$cms_version' frameborder='0' width='600' height='700'></iframe>";
      }
      break;
  }
  return $element;
}

/**
 * Implements hook_field_widget_info().
 *
 * This widget type will add fancybox (jQuery plugin)
 * and link to open iframe with form for file uploadin
 *
 * @see groupdocs_viewer_field_widget_form()
 */
function groupdocs_viewer_field_widget_info() {
  return array(
    'groupdocs_file_uploading' => array(
      'label' => t('Upload file or enter embedded code'),
      'field types' => array('groupdocs_embedded_code'),
    ),
  );
}
/**
 * Implements hook_field_widget_form().
 *
 * This hook add one text input for uploaded file guid
 * link to iframe with upload file form
 * and attached fancybox (jQuery plugin)
 */
function groupdocs_viewer_field_widget_form(&$form, &$form_state, $field, $instance, $langcode, $items, $delta, $element) {
  $value = isset($items[$delta]['groupdocs_embedded_code']) ? $items[$delta]['groupdocs_embedded_code'] : '';

  $widget = $element;
  $widget['#delta'] = $delta;

  switch ($instance['widget']['type']) {

    case 'groupdocs_file_uploading':
      $widget += array(
        '#suffix' => l(t('Choose file GD Viewer'), 'groupdocs_viewer/upload_file/lightbox2', array(
                              'attributes' => array(
                                'class' => array('groupdocs_upload_link'),
                                'rel' => array('lightframe[group|width:600px;]'),
                              ))),

        '#attributes' => array('class' => array('edit-groupdocs_viewer-fileupload')),
      );

      $widget += array(
        '#type' => 'textfield',
        '#default_value' => $value,
        // Allow a slightly larger size that the field length to allow for some
        // configurations where all characters won't fit in input field.
        '#size' => 64,
        '#maxlength' => 64,
      );
      break;
  }

  $element['groupdocs_embedded_code'] = $widget;
  return $element;
}


/**
 * Implements hook_field_is_empty().
 *
 * hook_field_is_emtpy() is where Drupal asks us if this field is empty.
 * Return TRUE if it does not contain data, FALSE if it does. This lets
 * the form API flag an error when required fields are empty.
 */
function groupdocs_viewer_field_is_empty($item, $field) {
  return empty($item['groupdocs_embedded_code']);
}