<?php

/**
 * @file
 * Displays and processes the mail send form.
 *
 * This file is included by the print_mail module and includes the
 * mail form display, validation and submit hooks.
 *
 * @ingroup print
 */

// Include MIME library, if available.
@include_once 'Mail/mime.php';

/**
 * Form constructor for the send by email form.
 *
 * @ingroup forms
 */
function print_mail_form($form, &$form_state) {
  // Remove the printmail/ prefix.
  $path_arr = explode('/', $_GET['q']);
  unset($path_arr[0]);
  $path = filter_xss(implode('/', $path_arr));
  if (empty($path)) {
    // If no path was provided, let's try to generate a page for the referer.
    global $base_url;
    $link = print_mail_print_link();

    $ref = $_SERVER['HTTP_REFERER'];
    $path = preg_replace("!^$base_url/!", '', $ref);
    if (($path === $ref) || empty($path)) {
      $path = variable_get('site_frontpage', 'node');
    }
    drupal_goto($link['path'] . '/' . $path);
  }
  elseif (ctype_digit($path_arr[1])) {
    if (drupal_lookup_path('source', $path)) {
      // This is a numeric alias.
      $path = drupal_get_normal_path($path);
    }
    else {
      // Normal nid.
      $path = 'node/' . $path;
    }
  }
  else {
    $path = drupal_get_normal_path($path);
  }

  // Handle the query.
  $query = $_GET;
  unset($query['q']);

  return print_mail_form_for_path($form, $form_state, $path, $query);
}

/**
 * Build email form for the page provided in the path argument.
 *
 * @param array $form
 *   Form.
 * @param array $form_state
 *   Form state.
 * @param string $path
 *   Path.
 * @param array $query
 *   Query.
 * @param Object $user
 *   Current user.
 *
 * @return array
 *   Modified form.
 *
 * @ingroup forms
 */
function print_mail_form_for_path($form, &$form_state, $path, $query = NULL, $user = NULL) {
  if ($user === NULL) {
    global $user;
  }

  $print_mail_hourly_threshold = variable_get('print_mail_hourly_threshold', PRINT_MAIL_HOURLY_THRESHOLD);

  if ((!user_access('send unlimited emails')) && (!flood_is_allowed('print_mail', $print_mail_hourly_threshold))) {
    $form['flood'] = array(
      '#type' => 'markup',
      '#markup' => '<p>' . format_plural($print_mail_hourly_threshold, 'You cannot send more than 1 message per hour. Please try again later.', 'You cannot send more than @count messages per hour. Please try again later.') . '</p>',
    );
    return $form;
  }

  $print_mail_teaser_default = variable_get('print_mail_teaser_default', PRINT_MAIL_TEASER_DEFAULT_DEFAULT);
  $print_mail_teaser_choice = variable_get('print_mail_teaser_choice', PRINT_MAIL_TEASER_CHOICE_DEFAULT);
  $print_mail_user_recipients_default = variable_get('print_mail_user_recipients', PRINT_MAIL_USER_RECIPIENTS_DEFAULT);
  $form = array();

  $cid = isset($_GET['comment']) ? (int) $_GET['comment'] : NULL;
  $title = _print_get_title($path);

  $options = array();
  if ($print_mail_user_recipients_default) {
    if (module_exists('realname')) {
      $sql = "SELECT u.mail, r.realname AS name from {users} u LEFT JOIN {realname} r ON u.uid = r.uid WHERE u.uid <> :uid AND status = 1 ORDER BY name ASC";
    }
    else {
      $sql = "SELECT mail, name from {users} WHERE uid <> :uid AND status = 1 ORDER BY name ASC";
    }
    $recipients = db_query($sql, array(':uid' => drupal_anonymous_user()->uid));
    foreach ($recipients as $recipient) {
      $options[$recipient->mail] = $recipient->name;
    }
  }

  if (count($form_state['input']) == 0) {
    $nodepath = drupal_get_normal_path($path);
    db_merge('print_mail_page_counter')
      ->key(array('path' => substr($nodepath, 0, 255)))
      ->fields(array(
        'totalcount' => 1,
        'timestamp' => REQUEST_TIME,
      ))
      ->expression('totalcount', 'totalcount + 1')
      ->execute();
  }

  $form['path'] = array('#type' => 'value', '#value' => $path);
  $form['query'] = array('#type' => 'value', '#value' => $query);
  $form['cid'] = array('#type' => 'value', '#value' => $cid);
  $form['title'] = array('#type' => 'value', '#value' => $title);

  $form['fld_from_addr'] = array(
    '#type' => 'textfield',
    '#title' => t('Your email'),
    '#size' => 62,
    '#required' => TRUE,
  );
  $form['fld_from_name'] = array(
    '#type' => 'textfield',
    '#title' => t('Your name'),
    '#size' => 62,
  );
  $form['txt_to'] = array(
    '#tree' => TRUE,
  );
  $form['txt_to']['addrs'] = array(
    '#type' => 'textarea',
    '#title' => t('Send to'),
    '#rows' => 3,
    '#resizable' => FALSE,
    '#description' => t('Enter multiple addresses separated by commas and/or different lines.'),
    '#required' => !$print_mail_user_recipients_default,
  );
  if ($print_mail_user_recipients_default) {
    $form['txt_to']['users'] = array(
      '#type' => 'select',
      '#title' => t('Send to users'),
      '#multiple' => TRUE,
      '#size' => 10,
      '#options' => $options,
    );
  }
  $form['fld_subject'] = array(
    '#type' => 'textfield',
    '#title' => t('Subject'),
    '#size' => 62,
    '#required' => TRUE,
  );
  if (!empty($title)) {
    // To prevent useless translation strings, translate only non-node titles.
    if (drupal_substr($path, 0, 5) != 'node/') {
      $title = t($title);
    }

    $form['fld_title'] = array(
      '#type' => 'item',
      '#title' => t('Page to be sent'),
      '#markup' => l($title, $path, array('attributes' => array('title' => t('View page')), 'query' => $query)),
    );
  }
  $form['txt_message'] = array(
    '#type' => 'textarea',
    '#title' => t('Your message'),
    '#rows' => 6,
    '#required' => TRUE,
  );

  if ($print_mail_teaser_choice) {
    $form['chk_teaser'] = array(
      '#type' => 'checkbox',
      '#title' => t('Send only the teaser'),
      '#default_value' => $print_mail_teaser_default,
    );
  }
  else {
    $form['chk_teaser'] = array('#type' => 'value', '#value' => $print_mail_teaser_default);
  }

  $form['actions'] = array(
    '#type' => 'actions',
  );

  $form['actions']['submit'] = array(
    '#name' => 'submit',
    '#type' => 'submit',
    '#value' => t('Send email'),
  );
  $form['actions']['cancel'] = array(
    '#name' => 'cancel',
    '#type' => 'submit',
    '#value' => t('Cancel'),
  );

  if ($user->uid != 0) {
    $user_name = check_plain(strip_tags(theme('username', array('account' => $user))));
    $form['fld_from_addr']['#default_value'] = $user->mail;
    $form['fld_from_addr']['#disabled'] = TRUE;
    $form['fld_from_addr']['#value'] = $user->mail;
    $form['fld_from_name']['#default_value'] = $user_name;
  }
  else {
    $user_name = t('Someone');
  }
  $site_name = variable_get('site_name', t('an interesting site'));
  $form['fld_subject']['#default_value'] = t('!user has sent you a message from !site', array(
    '!user' => $user_name,
    '!site' => $site_name,
    '!title' => $title,
  ));
  $form['txt_message']['#default_value'] = '';

  return $form;
}

/**
 * Returns HTML for the send by-email form.
 *
 * Adds a class to the form labels. This class is used to place the label on
 * the left of the input fields.
 *
 * @param array $variables
 *   Theme variables including the form.
 *
 * @return string
 *   Send by-email form HTML.
 *
 * @see print_mail_form()
 * @ingroup forms
 * @ingroup themeable
 * @ingroup print_themeable
 */
function theme_print_mail_form($variables) {
  $form = $variables['form'];

  drupal_add_css(drupal_get_path('module', 'print_mail') . '/css/print_mail.theme.css');
  $content = '';
  foreach (element_children($form) as $key) {
    $tmp = drupal_render($form[$key]);
    switch ($key) {
      case 'fld_from_addr':
      case 'fld_from_name':
      case 'txt_to':
      case 'fld_subject':
      case 'fld_title':
        $tmp = str_replace('<label', '<label class ="printmail-label"', $tmp);
        break;
    }
    $content .= $tmp;
  }
  return $content;
}

/**
 * Theme function for the email sending just the link.
 *
 * Allows themes and modules to override the default sendlink plain text format.
 *
 * @param array $params
 *   Value of $params as passed to print_mail_mail().
 *
 * @return string
 *   Plain text containing the message and a simple link to the content.
 *
 * @ingroup themeable
 * @ingroup print_themeable
 */
function theme_print_mail_sendlink_plain($params) {
  return $params['message'] . '\n\n' . $params['link'];
}

/**
 * Theme function for the email sending just the link.
 *
 * Allows themes and modules to override the default sendlink HTML format.
 *
 * @param array $params
 *   Value of $params as passed to print_mail_mail().
 *
 * @return string
 *   HTML text containing the message and a simple link to the content.
 *
 * @ingroup themeable
 * @ingroup print_themeable
 */
function theme_print_mail_sendlink_html($params) {
  return $params['message'] . '<br/><br/>' . l($params['title'], $params['link']);
}

/**
 * Form validation handler for print_mail_form().
 *
 * @see print_mail_form()
 * @ingroup forms
 */
function print_mail_form_validate($form, &$form_state) {
  $print_mail_user_recipients_default = variable_get('print_mail_user_recipients', PRINT_MAIL_USER_RECIPIENTS_DEFAULT);

  if (array_key_exists('cancel', $form_state['input'])) {
    form_set_error(NULL, '', TRUE);
    drupal_get_messages('error');

    drupal_goto(preg_replace('!^book/export/html/!', 'node/', $form_state['values']['path']), array('query' => $form_state['values']['query']));
    return;
  }
  $from_addr = trim($form_state['values']['fld_from_addr']);
  $test = user_validate_mail($from_addr);
  if ($test) {
    form_set_error('fld_from_addr', $test);
  }

  $to_array = array();
  if (!empty($form_state['values']['txt_to']['users'])) {
    $to_array = array_values($form_state['values']['txt_to']['users']);
  }

  if (!empty($form_state['values']['txt_to']['addrs'])) {
    // All new-lines are replaced by commas.
    $to_addrs = preg_replace('![\r|\n|,]+!', ',', trim($form_state['values']['txt_to']['addrs']));
    // Create an array from the string.
    $to_array = array_merge($to_array, explode(',', $to_addrs));
  }

  if (empty($to_array) && $print_mail_user_recipients_default) {
    form_set_error('txt_to', t('You must specify at least one email address or user as a recipient.'));
  }

  // Verify each element of the array.
  foreach ($to_array as $key => $address) {
    $address = trim($address);
    if (preg_match('/(.*?) <(.*)>/s', $address, $matches)) {
      // Address is of the type User Name <user@domain.tld>.
      $test = user_validate_mail($matches[2]);
      $to_array[$key] = trim($matches[1]) . ' <' . $matches[2] . '>';
    }
    else {
      // Address must be user@domain.tld.
      $test = user_validate_mail($address);
    }
    if ($test) {
      form_set_error('txt_to', $test);
    }
  }

  $print_mail_hourly_threshold = variable_get('print_mail_hourly_threshold', PRINT_MAIL_HOURLY_THRESHOLD);

  if ((!user_access('send unlimited emails')) && (!flood_is_allowed('print_mail', $print_mail_hourly_threshold - count($to_array) + 1))) {
    form_set_error('txt_to', t('You cannot send more than %number messages per hour. Please reduce the number of recipients.', array('%number' => $print_mail_hourly_threshold)));
  }

  // In all fields, prevent insertion of custom headers.
  foreach ($form_state['values'] as $key => $string) {
    if ((drupal_substr($key, 0, 4) == 'fld_') && ((strpos($string, "\n") !== FALSE) || (strpos($string, "\r") !== FALSE))) {
      form_set_error($key, 'Found invalid character');
    }
  }

  $form_state['values']['fld_from_addr'] = $from_addr;
  $form_state['values']['fld_from_name'] = trim($form_state['values']['fld_from_name']);
  // Re-create the string from the re-organized array.
  $form_state['values']['txt_to']['addrs'] = implode(', ', $to_array);
}

/**
 * Form submission handler for print_mail_form().
 *
 * @see print_mail_form()
 * @see print_controller()
 * @ingroup forms
 */
function print_mail_form_submit($form, &$form_state) {
  if (!array_key_exists('cancel', $form_state['input'])) {
    module_load_include('inc', 'print', 'print.pages');
    module_load_include('inc', 'print', 'includes/print');

    $link = print_mail_print_link();
    $cid = isset($form_state['values']['cid']) ? $form_state['values']['cid'] : NULL;
    $view_mode = $form_state['values']['chk_teaser'] ? 'teaser' : PRINT_VIEW_MODE;
    $node = print_controller($form_state['values']['path'], $link['format'], $cid, $view_mode);

    if ($node) {
      $print_mail_send_option_default = variable_get('print_mail_send_option_default', PRINT_MAIL_SEND_OPTION_DEFAULT);

      $params = array();
      $params['subject'] = $form_state['values']['fld_subject'];
      $params['message'] = t('Message from sender') . ':<br /><br /><em>' . nl2br(check_plain($form_state['values']['txt_message'])) . '</em>';
      $params['link'] = url($form_state['values']['path'], array('absolute' => TRUE, 'query' => $form_state['values']['query']));
      $params['title'] = $form_state['values']['title'];

      // If a name is provided, make From: in the format Common Name <address>.
      if (!empty($form_state['values']['fld_from_name'])) {
        $from = '"' . mime_header_encode($form_state['values']['fld_from_name']) . '" <' . $form_state['values']['fld_from_addr'] . '>';
      }
      else {
        $from = $form_state['values']['fld_from_addr'];
      }

      // If using reply-to, move the From: info to the params array, so that it
      // is passed to hook_mail later.
      if (variable_get('print_mail_use_reply_to', PRINT_MAIL_USE_REPLY_TO)) {
        $params['from'] = $from;
        $from = NULL;
      }

      // Spaces in img URLs must be replaced with %20.
      $pattern = '!<(img\s[^>]*?)>!is';
      $node->content = preg_replace_callback($pattern, '_print_replace_spaces', $node->content);

      $params['body'] = theme('print', array(
        'node' => $node,
        'query' => $form_state['values']['query'],
        'format' => $link['format'],
        'expand_css' => TRUE,
        'message' => $params['message'],
      ));

      // Img elements must be set to absolute.
      $pattern = '!<(img\s[^>]*?)>!is';
      $params['body'] = preg_replace_callback($pattern, '_print_rewrite_urls', $params['body']);

      // Convert the a href elements, to make sure no relative links remain.
      $pattern = '!<(a\s[^>]*?)>!is';
      $params['body'] = preg_replace_callback($pattern, '_print_rewrite_urls', $params['body']);

      // Enable support for third-party modules to alter the e-mail before
      // being sent.
      drupal_alter('print_mail', $params, $to);

      $ok = FALSE;
      $use_job_queue = variable_get('print_mail_job_queue', PRINT_MAIL_JOB_QUEUE_DEFAULT);
      $queue = NULL;
      if ($use_job_queue) {
        $queue = DrupalQueue::get('print_mail_send');
      }

      $addresses = explode(', ', $form_state['values']['txt_to']['addrs']);
      foreach ($addresses as $to) {
        $ret = array();
        if ($use_job_queue) {
          // Use job queue to send mails during cron runs.
          $queue->createItem(array(
            'module' => 'print_mail',
            'key' => $print_mail_send_option_default,
            'to' => $to,
            'language' => language_default(),
            'params' => $params,
            'from' => $from,
          ));
        }
        else {
          // Send mail immediately using Drupal's mail handler.
          $ret = drupal_mail('print_mail', $print_mail_send_option_default, $to, language_default(), $params, $from);
        }
        if ($use_job_queue || $ret['result']) {
          flood_register_event('print_mail');
          $ok = TRUE;
        }
      }
      if ($ok) {
        $query = empty($form_state['values']['query']) ? '' : '?' . rawurldecode(drupal_http_build_query($form_state['values']['query']));
        watchdog('print_mail', '%name [%from] sent %page to [%to]', array(
          '%name' => $form_state['values']['fld_from_name'],
          '%from' => $form_state['values']['fld_from_addr'],
          '%page' => $form_state['values']['path'] . $query,
          '%to' => $form_state['values']['txt_to']['addrs'],
        ));
        $site_name = variable_get('site_name', t('us'));
        drupal_set_message(check_plain(t('Thank you for spreading the word about !site.', array('!site' => $site_name))));

        $nodepath = drupal_get_normal_path($form_state['values']['path']);
        db_update('print_mail_page_counter')
          ->fields(array(
            'sentcount' => 1,
            'sent_timestamp' => REQUEST_TIME,
          ))
          ->condition('path', $nodepath, '=')
          ->expression('sentcount', 'sentcount + :inc', array(':inc' => count($addresses)))
          ->execute();
      }
    }
  }

  $form_state['redirect'] = array(
    preg_replace('!^book/export/html/!', 'node/', $form_state['values']['path']), array(
      'query' => $form_state['values']['query'],
    ),
  );
}
