<?php

/**
 * @file
 * Allows site visitors and users to report issues about this site.
 */

/**
 * Open state (unprocessed) for feedback entries.
 */
define('FEEDBACK_OPEN', 0);

/**
 * Processed state for feedback entries.
 */
define('FEEDBACK_PROCESSED', 1);

/**
 * Implements hook_theme().
 */
function feedback_theme() {
  return array(
    'feedback_admin_view_form' => array(
      'render element' => 'form',
    ),
    'feedback_entry' => array(
      'render element' => 'elements',
      'template' => 'feedback-entry',
      'file' => 'feedback.admin.inc',
    ),
    'feedback_form_display' => array(
      'template' => 'feedback-form-display',
      'variables' => array('title' => NULL, 'content' => NULL),
    ),
  );
}

/**
 * Implements hook_entity_info().
 */
function feedback_entity_info() {
  $return = array(
    'feedback' => array(
      'label' => t('Feedback'),
      'controller class' => 'FeedbackController',
      'base table' => 'feedback',
      'uri callback' => 'feedback_uri',
      'fieldable' => TRUE,
      'entity keys' => array(
        'id' => 'fid',
      ),
      'bundles' => array(
        'feedback' => array(
          'label' => t('Feedback'),
          'admin' => array(
            'path' => 'admin/config/user-interface/feedback',
            'access arguments' => array('administer feedback'),
          ),
        ),
      ),
      'view modes' => array(
        'full' => array(
          'label' => t('Full feedback entry'),
          'custom settings' => FALSE,
        ),
        'teaser' => array(
          'label' => t('Teaser'),
          'custom settings' => FALSE,
        ),
        'widget' => array(
          'label' => t('Widget'),
          'custom settings' => FALSE,
        ),
      ),
      // Disable Metatags (metatag) module's entity form additions.
      'metatags' => FALSE,
    ),
  );

  return $return;
}

/**
 * Implements hook_field_extra_fields().
 */
function feedback_field_extra_fields() {
  $extras['feedback']['feedback']['form']['help'] = array(
    'label' => t('Help'),
    'description' => t('Feedback submission guidelines'),
    'weight' => -10,
  );
  $extras['feedback']['feedback']['form']['messages'] = array(
    'label' => t('Entries'),
    'description' => t('Existing feedback entries for the current page'),
    'weight' => -5,
  );
  $extras['feedback']['feedback']['form']['message'] = array(
    'label' => t('Message'),
    'description' => t('Feedback message form text field'),
    'weight' => 0,
  );

  $extras['feedback']['feedback']['display']['location'] = array(
    'label' => t('Location'),
    'description' => t('The URL of the page the message was submitted on'),
    'weight' => -15,
  );
  $extras['feedback']['feedback']['display']['date'] = array(
    'label' => t('Date'),
    'description' => t('The submission date of the message'),
    'weight' => -10,
  );
  $extras['feedback']['feedback']['display']['user'] = array(
    'label' => t('User'),
    'description' => t('The name of the user who submitted the message'),
    'weight' => -5,
  );
  $extras['feedback']['feedback']['display']['message'] = array(
    'label' => t('Message'),
    'description' => t('The main feedback message'),
    'weight' => 0,
  );
  return $extras;
}

/**
 * Entity uri callback.
 */
function feedback_uri($entry) {
  return array(
    'path' => 'admin/reports/feedback/' . $entry->fid,
  );
}

/**
 * Implements hook_permission().
 */
function feedback_permission() {
  return array(
    'access feedback form' => array(
      'title' => t('Access feedback form'),
      'description' => t('Submit feedback messages.'),
    ),
    'view feedback messages' => array(
      'title' => t('View feedback messages'),
      'description' => t('View, process, and delete submitted feedback messages.'),
    ),
    'administer feedback' => array(
      'title' => t('Administer feedback settings'),
    ),
  );
}

/**
 * Implements hook_menu().
 */
function feedback_menu() {
  $items['admin/reports/feedback'] = array(
    'title' => 'Feedback messages',
    'description' => 'View feedback messages.',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('feedback_admin_view_form'),
    'access arguments' => array('view feedback messages'),
    'file' => 'feedback.admin.inc',
  );
  $items['admin/reports/feedback/%feedback'] = array(
    'title' => 'Feedback entry',
    'page callback' => 'feedback_view',
    'page arguments' => array(3),
    'access arguments' => array('view feedback messages'),
    'file' => 'feedback.admin.inc',
  );
  $items['admin/reports/feedback/%feedback/view'] = array(
    'title' => 'View',
    'type' => MENU_DEFAULT_LOCAL_TASK,
    'weight' => -10,
  );
  $items['admin/reports/feedback/%feedback/edit'] = array(
    'title' => 'Edit',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('feedback_entry_form', 3),
    'access arguments' => array('view feedback messages'),
    'type' => MENU_LOCAL_TASK,
    'file' => 'feedback.admin.inc',
  );
  $items['admin/reports/feedback/%feedback/delete'] = array(
    'title' => 'Delete feedback entry',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('feedback_delete_confirm', 3),
    'access arguments' => array('view feedback messages'),
    'type' => MENU_CALLBACK,
    'file' => 'feedback.admin.inc',
  );
  $items['admin/config/user-interface/feedback'] = array(
    'title' => 'Feedback',
    'description' => 'Administer feedback settings.',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('feedback_admin_settings_form'),
    'access arguments' => array('administer feedback'),
    'file' => 'feedback.admin.inc',
  );
  $items['admin/config/user-interface/feedback/settings'] = array(
    'title' => 'Settings',
    'type' => MENU_DEFAULT_LOCAL_TASK,
    'weight' => -10,
  );

  return $items;
}

/**
 * Implements hook_page_build().
 */
function feedback_page_build(&$page) {
  if (user_access('access feedback form') && !feedback_match_path(variable_get('feedback_excluded_paths', 'admin/reports/feedback'))) {
    $page['page_bottom']['feedback'] = array(
      '#theme' => 'feedback_form_display',
      '#title' => t('Feedback'),
      '#content' => drupal_get_form('feedback_form'),
    );
    $path = drupal_get_path('module', 'feedback');
    $page['page_bottom']['feedback']['#attached']['css'][] = $path . '/feedback.css';
    $page['page_bottom']['feedback']['#attached']['js'][] = $path . '/feedback.js';
  }
}

/**
 * Check if the current path matches any pattern in a set of patterns.
 *
 * @param $patterns
 *   String containing a set of patterns separated by \n, \r or \r\n.
 *
 * @return
 *   Boolean value: TRUE if the current path or alias matches a pattern.
 */
function feedback_match_path($patterns) {
  // Convert path to lowercase. This allows comparison of the same path
  // with different case. Ex: /Page, /page, /PAGE.
  $patterns = drupal_strtolower($patterns);

  // Convert the current path to lowercase.
  $path = drupal_strtolower(drupal_get_path_alias($_GET['q']));

  // Compare the lowercase internal and lowercase path alias (if any).
  $page_match = drupal_match_path($path, $patterns);
  if ($path != $_GET['q']) {
    $page_match = $page_match || drupal_match_path($_GET['q'], $patterns);
  }

  return $page_match;
}

/**
 * Form constructor for the feedback form.
 *
 * @see feedback_form_submit()
 * @ingroup forms
 */
function feedback_form($form, &$form_state) {
  $form['#attributes']['class'] = array('feedback-form');

  // Store the path on which this form is displayed.
  if (!isset($form_state['inline']['location'])) {
    $form_state['inline']['location'] = $_GET['q'];
  }
  $form['location'] = array(
    '#type' => 'value',
    '#value' => $form_state['inline']['location'],
  );

  $form['help'] = array(
    '#prefix' => '<div class="feedback-help">',
    '#markup' => t('If you experience a bug or would like to see an addition on the current page, feel free to leave us a message.'),
    '#suffix' => '</div>',
  );
  if (user_access('view feedback messages')) {
    if (arg(0) != 'node') {
      $feedbacks = feedback_load_multiple(array(), array('status' => FEEDBACK_OPEN, 'location_masked' => feedback_mask_path($_GET['q'])));
    }
    else {
      $feedbacks = feedback_load_multiple(array(), array('status' => FEEDBACK_OPEN, 'location' => $_GET['q']));
    }
    if ($feedbacks) {
      form_load_include($form_state, 'inc', 'feedback', 'feedback.admin');
      $form['messages'] = array(
        '#prefix' => '<div class="feedback-messages">',
        '#suffix' => '</div>',
      );
      foreach ($feedbacks as $fid => $feedback) {
        $form['messages'][$fid]['#feedback'] = $feedback;
        $form['messages'][$fid]['submitted'] = array('#markup' => t('@feedback-author !feedback-date:', array('@feedback-author' => format_username($feedback), '!feedback-date' => format_date($feedback->timestamp, 'small'))));
        $form['messages'][$fid]['submitted']['#prefix'] = '<div class="feedback-submitted">';
        $form['messages'][$fid]['submitted']['#suffix'] = '</div>';
        $form['messages'][$fid]['body'] = feedback_build_content($feedback, 'widget');
        $form['messages'][$fid]['body']['#prefix'] = '<div class="feedback-body">';
        $form['messages'][$fid]['body']['#suffix'] = '</div>';
      }
    }
  }
  $form['message'] = array(
    '#type' => 'textarea',
    '#attributes' => array('class' => array('feedback-message')),
    '#cols' => 20,
    '#title' => t('Message'),
    '#required' => TRUE,
    '#wysiwyg' => FALSE,
  );

  $entry = new stdClass();
  field_attach_form('feedback', $entry, $form, $form_state);

  $form['actions'] = array(
    '#type' => 'actions',
    // Without clearfix, the AJAX throbber wraps in an ugly way.
    // @todo Patch #type actions in core?
    '#attributes' => array('class' => array('clearfix')),
  );
  $form['actions']['submit'] = array(
    '#type' => 'submit',
    '#value' => t('Send feedback'),
    '#id' => 'feedback-submit',
    '#ajax' => array(
      'wrapper' => 'feedback-form',
      'callback' => 'feedback_form_ajax_callback',
      'progress' => array(
        'type' => 'throbber',
        'message' => '',
      ),
    ),
  );

  return $form;
}

/**
 * Form submission handler for feedback_form().
 */
function feedback_form_submit($form, &$form_state) {
  $entry = new stdClass();
  entity_form_submit_build_entity('feedback', $entry, $form, $form_state);
  $entry->message = $form_state['values']['message'];
  $entry->location = $form_state['values']['location'];
  feedback_save($entry);

  drupal_set_message(t('Thanks for your feedback!'));
}

/**
 * AJAX callback for feedback_form() submissions.
 */
function feedback_form_ajax_callback($form, &$form_state) {
  // If there was a form validation error, re-render the entire form.
  if (!$form_state['executed']) {
    return $form;
  }

  // Otherwise, return a fresh copy of the form, so the user may post additional
  // feedback.
  // Reset the static cache of drupal_html_id().
  // @see drupal_process_form()
  // @see drupal_html_id()
  $seen_ids = &drupal_static('drupal_html_id');
  $seen_ids = array();

  // Prevent the form from being processed again.
  // @see drupal_build_form()
  list($form, $new_form_state) = ajax_get_form();
  $new_form_state['input'] = array();
  drupal_process_form($form['#form_id'], $form, $new_form_state);

  // Return AJAX commands in order to output the special success message.
  // @see ajax_deliver()
  $build = array('#type' => 'ajax');
  $html = drupal_render($form);
  $build['#commands'][] = ajax_command_insert(NULL, $html);

  // A successful form submission normally means that there were no errors, so
  // we only render status messages.
  $messages = drupal_get_messages();
  $messages += array('status' => array());
  $messages = implode('<br />', $messages['status']);
  $html = '<div id="feedback-status-message">' . $messages . '</div>';
  $build['#commands'][] = ajax_command_append('#block-feedback-form', $html);
  return $build;
}

/**
 * Loads a feedback entry from the database.
 *
 * @param $fid
 *   Integer specifying the feedback ID to load.
 *
 * @return
 *   A loaded feedback entry object upon successful load, or FALSE if the entry
 *   cannot be loaded.
 *
 * @see feedback_load_multiple()
 */
function feedback_load($fid) {
  $entries = feedback_load_multiple(array($fid));
  return (isset($entries[$fid]) ? $entries[$fid] : FALSE);
}

/**
 * Loads feedback entries from the database.
 *
 * @param $fids
 *   An array of feedback entry IDs.
 * @param $conditions
 *   An associative array of conditions on the {feedback} table, where the keys
 *   are the database fields and the values are the values those fields
 *   must have.
 *
 * @return
 *   An array of feedback entry objects indexed by fid.
 *
 * @see hook_feedback_load()
 * @see feedback_load()
 * @see entity_load()
 * @see EntityFieldQuery
 */
function feedback_load_multiple($fids = array(), $conditions = array()) {
  return entity_load('feedback', $fids, $conditions);
}

/**
 * Saves changes to a feedback entry or adds a new feedback entry.
 *
 * @param $entry
 *   The feedback entry object to modify or add. If $entry->fid is omitted, a
 *   new entry will be added.
 *
 * @see hook_feedback_insert()
 * @see hook_feedback_update()
 */
function feedback_save($entry) {
  global $user;

  // Load the stored entity, if any.
  if (!empty($entry->fid) && !isset($entry->original)) {
    $entry->original = entity_load_unchanged('feedback', $entry->fid);
  }

  field_attach_presave('feedback', $entry);

  // Allow modules to alter the feedback entry before saving.
  module_invoke_all('feedback_presave', $entry);
  module_invoke_all('entity_presave', $entry, 'feedback');

  if (empty($entry->fid)) {
    $entry->message = trim($entry->message);

    $defaults = array(
      'uid' => $user->uid,
      'location_masked' => feedback_mask_path($entry->location),
      'url' => url($entry->location, array('absolute' => TRUE)),
      'timestamp' => REQUEST_TIME,
      'useragent' => $_SERVER['HTTP_USER_AGENT'],
    );
    foreach ($defaults as $key => $default) {
      if (!isset($entry->$key)) {
        $entry->$key = $default;
      }
    }

    $status = drupal_write_record('feedback', $entry);
    field_attach_insert('feedback', $entry);
    module_invoke_all('feedback_insert', $entry);
    module_invoke_all('entity_insert', $entry, 'feedback');
  }
  else {
    $status = drupal_write_record('feedback', $entry, 'fid');

    field_attach_update('feedback', $entry);
    module_invoke_all('feedback_update', $entry);
    module_invoke_all('entity_update', $entry, 'feedback');
  }
  unset($entry->original);

  return $status;
}

/**
 * Deletes a feedback entry.
 *
 * @param $fid
 *   A feedback entry ID.
 */
function feedback_delete($fid) {
  feedback_delete_multiple(array($fid));
}

/**
 * Deletes multiple feedback entries.
 *
 * @param $fids
 *   An array of feedback entry IDs.
 */
function feedback_delete_multiple($fids) {
  if (!empty($fids)) {
    $entries = feedback_load_multiple($fids);
    foreach ($entries as $fid => $entry) {
      field_attach_delete('feedback', $entry);
      module_invoke_all('feedback_delete', $entry);
      module_invoke_all('entity_delete', $entry, 'feedback');
    }
    db_delete('feedback')
      ->condition('fid', $fids, 'IN')
      ->execute();
  }
}

/**
 * 'Mask' a path, i.e. replace all numeric arguments in a path with '%' placeholders.
 *
 * Please note that only numeric arguments with a preceding slash will be
 * replaced.
 *
 * @param $path
 *   An internal Drupal path, f.e. 'user/123/edit'.
 * @return
 *   A 'masked' path, for above example 'user/%/edit'.
 *
 * @todo Use the untranslated patch of menu_get_item() instead.
 */
function feedback_mask_path($path) {
  return preg_replace('@/\d+@', '/%', $path);
}

/**
 * Implements hook_user_cancel().
 */
function feedback_user_cancel($edit, $account, $method) {
  switch ($method) {
    case 'user_cancel_reassign':
      db_update('feedback')
        ->fields(array('uid' => 0))
        ->condition('uid', $account->uid)
        ->execute();
      break;
  }
}

/**
 * Implements hook_user_delete().
 */
function feedback_user_delete($account) {
  $fids = db_query('SELECT fid FROM {feedback} WHERE uid = :uid', array(':uid' => $account->uid))->fetchCol();
  feedback_delete_multiple($fids);
}

/**
 * Implements hook_mollom_form_list().
 */
function feedback_mollom_form_list() {
  $forms['feedback_form'] = array(
    'title' => t('Feedback form'),
    'entity' => 'feedback',
    'bundle' => 'feedback',
    'entity delete multiple callback' => 'feedback_delete_multiple',
    'delete form' => 'feedback_delete_confirm',
    'delete form file' => array(
      'name' => 'feedback.admin',
    ),
    'report access' => array('view feedback messages'),
  );
  return $forms;
}

/**
 * Implements hook_mollom_form_info().
 */
function feedback_mollom_form_info($form_id) {
  $form_info = array(
    'mode' => MOLLOM_MODE_ANALYSIS,
    'bypass access' => array('administer feedback'),
    'elements' => array(
      'message' => t('Message'),
    ),
  );
  mollom_form_info_add_fields($form_info, 'feedback', 'feedback');
  return $form_info;
}

/**
 * Implements hook_views_api();
 */
function feedback_views_api() {
  return array(
    'api' => 3.0,
    'path' => drupal_get_path('module', 'feedback') . '/views',
  );
}