chat.module

<?php

/**
* Implementation of hook_menu().
*/
function chat_menu() {
  // Admin settings.
  $items['admin/config/user-interface/chat'] = array(
    'title' => 'Chat',
    'description' => 'Custom chat',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('chat_admin_form'),
    'access arguments' => array('administer site configuration'),
  );
  return $items;
}

/**
 * Callback function for admin setting.
 */
function chat_admin_form($form, &$form_state) {

  $settings = variable_get('chat_settings');

  $options['helper'] = array(
    '#markup' => t('<h3>Chat Options</h3>
<p>Custom chat, set chat URL and load on an IFRAME</p>'),
  );

  $options['url'] = array(
    '#type' => 'textfield',
    '#title' => t('Service URL'),
    '#default_value' => $settings['url'],
    '#size' => 60, 
    '#maxlength' => 128, 
    '#required' => TRUE,
  );
  $options['button_text'] = array(
    '#type' => 'textfield',
    '#title' => t('Button Text'),
    '#default_value' => $settings['button_text'],
    '#size' => 60, 
    '#maxlength' => 64, 
    '#required' => TRUE,
  );
  $options['delay'] = array(
    '#type' => 'textfield',
    '#title' => t('Delay in seconds'),
    '#default_value' => $settings['delay'],
    '#size' => 60, 
    '#maxlength' => 2, 
    '#required' => TRUE,
  );

  $options['#tree'] = TRUE;
  $form['chat_settings'] = $options;

  // Disable automatic defaults, which don't work with nested values.
  return system_settings_form($form, FALSE);
}

/**
 * Implementation of hook_block_info();
 */
function chat_block_info(){
  $blocks['block_chat'] = array(
    'info' => t('Chat TLS/UCAL'),
    'cache' => DRUPAL_NO_CACHE,
  );
  return $blocks;
}

/**
 * Implementation of hook_block_view();
*/
function chat_block_view($delta = '') {
  $settings = variable_get('chat_settings');
  $block = array();
  switch ($delta) {
    case 'block_chat':
      $block['content'] = theme('chat', array(
        'url' => $settings['url'],
        'button_text' => $settings['button_text'],
	  ));
      break;
  }
  return $block;
}

function chat_theme() {
  return array(
    'chat' => array(
      'template' => 'chat',
      'variables' => array(
        'url' => '#',
        'button_text' => 'Conectarse con un operador',
      ),
    ),
  );
}

/**
 * Implements hook_preprocess_THEME(&$variables).
 */
function chat_preprocess_chat(&$variables) {
  $module_path = drupal_get_path('module', 'chat');
  $settings = variable_get('chat_settings');
  $delay = 0;
  //If exist the session the delay = 0
  if (!isset($_SESSION['ucal_chat_session'])) {
    $_SESSION['ucal_chat_session'] = 1;
    $delay = $settings['delay'];
  }
  drupal_add_js(
    array(
      'chat' => array(
        'delay' => $delay,
      ),
    ),
    array('type' =>'setting')
  );
  drupal_add_js($module_path . '/js/chat.js');
}

/**
 * Implements hook_init().
 */
function chat_init() {
  //global $user;
}