<?php
// $Id: messaging_twitter.module,v 1.1.2.5 2009-04-02 10:23:06 jareyero Exp $
/**
 * @file
 * Messaging Twitter sending method
 * 
 * Developed by Will White
 * 
 * Development Seed, http://www.developmentseed.org
 */

/**
 * Implementation of hook_messaging
 */
function messaging_twitter_messaging($op = 'info') {
  switch($op) {
    case 'send methods':
      $info['twitter_dm'] = array(
        'title' => t('Twitter Direct Message'),
        'name' => t('Twitter Direct Message'),
        'group' => 'twitter',
        'type' => MESSAGING_TYPE_SEND,
        'glue' => ' ',
        'description' => t("Send as a Twitter direct message."),
        'send callback' => 'messaging_twitter_send_dm',
        'destination callback' => 'messaging_twitter_user_destination',
        'system accounts' => TRUE, // Supports multiple sending accounts
        'account type' => 'twitter', // The type of system account to use
      );
      $info['twitter_at'] = array(
        'title' => t('Twitter @ Message'),
        'name' => t('Twitter @ Message'),
        'group' => 'twitter',
        'type' => MESSAGING_TYPE_SEND,
        'glue' => ' ',
        'description' => t("Send as a Twitter @ message."),
        'send callback' => 'messaging_twitter_send_at',
        'destination callback' => 'messaging_twitter_user_destination',
        'system accounts' => TRUE, // Supports multiple sending accounts
        'account type' => 'twitter', // The type of system account to use
      );
      return $info;  
  }
}

/**
 * Map user account to twitter screen name
 */
function messaging_twitter_user_destination($account) {
  static $cache = array();
   
  if (!array_key_exists($account->uid, $cache)) {
    _messaging_twitter_include();  
    $twitter_accounts = twitter_get_user_accounts($account->uid);
    if (is_array($twitter_accounts) && !empty($twitter_accounts)) {
      reset($twitter_accounts);
      $first = current($twitter_accounts);
      $cache[$account->uid] = $first['screen_name'];
    } else {
      $cache[$account->uid] = NULL;
    }
  }   
  return $cache[$account->uid];
}

/**
 * Send a direct message to Twitter user
 */
function messaging_twitter_send_dm($destination, $message, $params = array()) {
  _messaging_twitter_include();

  $url = 'http://twitter.com/direct_messages/new.xml';
  $site_username = variable_get('messaging_twitter_username', '');
  $site_password = variable_get('messaging_twitter_password', '');
  $headers = array('Authorization' => 'Basic '. base64_encode($site_username .':'. $site_password),
                   'Content-type' => 'application/x-www-form-urlencoded');
  $data = 'text=' . urlencode($message->body) . '&user=' . $destination;

  $result = drupal_http_request($url, $headers, 'POST', $data);
}

/**
 * Send a direct message to Twitter user
 */
function messaging_twitter_send_at($destination, $message, $params = array()) {
  _messaging_twitter_include();

  $url = 'http://twitter.com/statuses/update.xml';
  $site_username = variable_get('messaging_twitter_username', '');
  $site_password = variable_get('messaging_twitter_password', '');
  
  $body = '@' . $destination . ' ' . $message->body;
  $headers = array('Authorization' => 'Basic '. base64_encode($site_username .':'. $site_password),
                   'Content-type' => 'application/x-www-form-urlencoded');
  $data = 'status=' . urlencode($body);

  $result = drupal_http_request($url, $headers, 'POST', $data);
}

/**
 * Implementation of hook_menu().
 */
function messaging_twitter_menu() {
  $items = array();
  
  $items['admin/messaging/settings/method/twitter'] = array(
    'title' => 'Twitter',
    'description' => 'Configure the Twitter ID information for the site.',
    'page callback' => 'messaging_twitter_admin',
    'access arguments' => array('administer messaging'),
    'type' => MENU_LOCAL_TASK,   
  );

  return $items;
}

/**
 * Admin settings
 */
function messaging_twitter_admin() {
  _messaging_twitter_include();
  $output = '';
  $username = variable_get('messaging_twitter_username', '');
  $password = variable_get('messaging_twitter_password', '');
  if ($username && $password) {
    $account = twitter_fetch_account_info($username, $password);
    $output .= theme('image', $account['profile_image_url'], '', '', array(), FALSE);
    $output .= $account['name'];
  }
  $output .= drupal_get_form('messaging_twitter_admin_form');
  return $output;
}

/**
 * Admin settings form
 */
function messaging_twitter_admin_form() {
  $form = array();
  
  $form['messaging_twitter_username'] = array(
    '#type' => 'textfield',
    '#title' => t('Username'),
    '#default_value' => variable_get('messaging_twitter_username', ''),
    '#size' => 40,
    '#maxlength' => 255,
    '#required' => TRUE,
  );
  $form['messaging_twitter_password'] = array(
    '#type' => 'password',
    '#title' => t('Password'),
    '#default_value' => variable_get('messaging_twitter_password', ''),
    '#size' => 30,
    '#maxlength' => 64,
    '#required' => TRUE,
  );
  
  return system_settings_form($form);
}

/**
 * Validate admin settings
 */
function messaging_twitter_admin_form_validate($form, &$form_state) {
  _messaging_twitter_include();
  if (!twitter_authenticate($form_state['values']['messaging_twitter_username'], $form_state['values']['messaging_twitter_password'])) {
    form_set_error('name', t('Twitter authentication failed. Please check your username and password.'));
  }
}

/**
 * Load twitter inc only once
 */
function _messaging_twitter_include() {
  static $include = FALSE;
  if (!$include) {
    module_load_include('inc', 'twitter');
    $include = TRUE;
  }
}