<?php
/**
 * @file
 * Simple messaging using html page. Messaging method plug-in
 * 
 * This is a really simple message viewer and also an illustration of pulling messaging methods
 */

// Number of messages to display per page
define('MESSAGING_DEBUG_PAGER', 10);

/**
 * Implementation of hook_menu().
 */
function messaging_debug_menu() {
  $items['user/%user/messagelog'] = array(
    'type' => MENU_LOCAL_TASK,
    'title' => 'Message log',
    'page callback' => 'messaging_debug_user_page',
    'page arguments' => array(1),
    'access callback' => 'messaging_debug_access',
    'access arguments' => array(1),
  );
  return $items;
}

/**
 * Access calback
 */
function messaging_debug_access($account) {
  global $user;
  return $account->uid && (($account->uid == $user->uid) || user_access('administer messaging'));
}

/**
 * Implementation of hook_block()
 */
function messaging_debug_block($op = 'list', $delta = 0, $edit = array()) {
  switch ($op) {
    case 'list':
      $blocks[0]['info'] = t('Debug: Post message');
      $blocks[1]['info'] = t('Debug: Message log');
      return $blocks;
    case 'view':
      switch ($delta) {
        case 0:
          $block['subject'] = t('Post message');
          $block['content'] = drupal_get_form('messaging_debug_post_form');
          return $block;
        case 1:
          if (!empty($_SESSION['messaging_debug_store'])) {
            $block['subject'] = t('Message log');
            foreach ($_SESSION['messaging_debug_store'] as $index => $message) {
              list($text, $variables) = _messaging_debug_log_text($message);
              $description = t($text, $variables);
              $form[$index]= array('#type' => 'fieldset', 
                '#title' => truncate_utf8($description, 20),
                '#description' => $description,
                '#collapsible' => TRUE, '#collapsed' => TRUE);
              $form[$index][] = array('#type' => 'item', '#title' => t('Subject'), '#value' => check_plain($message->subject));
              $form[$index][] = array('#type' => 'item', '#title' => t('Body'), '#value' => check_plain($message->body));
            }
            $block['content'] = drupal_render($form);
            unset($_SESSION['messaging_debug_store']);
            return $block;
          }
          break;
      }
      break; 
  }
}

/**
 * Incoming message form
 */
function messaging_debug_post_form() {
  global $user;

  // Availbable sending methods
  $form['method'] = array(
    '#title' => t('Send method'),
    '#type' => 'select',
    '#options' => messaging_method_list(),
    '#default_value' => messaging_method_default(),
  );
  $form['to'] = array(
    '#type' => 'textfield',
    '#title' => t('Destination'),
    '#size' => 20,
    '#autocomplete_path' => 'user/autocomplete',
    '#default_value' => $user->name, 
  );
  $form['subject'] = array(
      '#type' => 'textfield',
      '#title' => t('Subject'),
      '#size' => 20,
  );
  $form['body'] = array(
      '#type' => 'textarea',
      '#title' => t('Body'),    
  );
    
  $form['submit'] = array('#type' => 'submit', '#value' => t('Send'));
  
  return $form;
}

/**
 * Post test message
 */
function messaging_debug_post_form_submit($form, $form_state) {
  global $user;  
  
  // Convert body in array of lines
  $body = split("\n", $form_state['values']['body']);
  $body = array_map('trim', $body);
  
  $message = (object)array(
    'type' => 'debug',
    'subject' => $form_state['values']['subject'],
    'body' => $body,  
  );
  
  // Destination may be account or plain parameter/s
  $destination = $form_state['values']['to'];
  if ($account = user_load(array('name' => $destination))) {
    $result = messaging_message_send_user($account, $message, $form_state['values']['method']);
  } else {
    $result = messaging_message_send(array($destination), $message, $form_state['values']['method']);
  }
  drupal_set_message(t('Sent message with result: %result', array('%result' => $result ? 'OK' : 'Error'))); 
}

/**
 * Implementation of hook_form_alter()
 */
function messaging_debug_form_alter(&$form, $form_state, $form_id) {
  if ($form_id == 'messaging_admin_settings') {
    $form['general']['messaging_debug'] = array(
      '#title' => t('Debug mode'),
      '#type' => 'radios',
      '#options' => array(t('Disabled'), t('Enabled')),
      '#default_value' => variable_get('messaging_debug', 0),
      '#description' => t('If enabled, messages wont be sent out but logged to watchdog, and displayed in the page footer.')
    );    
  }
}

/**
 * Menu callback. Display pending messages to the user
 * 
 * Sample Implementation of messaging pull methods
 */
function messaging_debug_user_page($account) {
  drupal_set_title(t('Messages for %name', array('%name' => $account->name)));
  // Fetch all pending messages.
  $output = '';
  
  // Use this method's info for all the messages
  $messages = messaging_store('get', array('uid' => $account->uid), array('mqid DESC'), MESSAGING_DEBUG_PAGER, 0);
  if ($messages) {
    $header = array(t('Method'), t('Subject'), t('Body'));
    foreach ($messages as $message) {
      // Check plain everything so we can actually see the mark up if any
      $rows[] = array($message->method, check_plain($message->subject), check_plain($message->body));
    }
    $output .= theme('table', $header, $rows);
    $output .= theme('pager', array(), MESSAGING_DEBUG_PAGER); 
  } else {
    $output .=  t('No logged messages');
  }
  return $output;
}

/**
 * Implementation of hook_messaging
 */
function messaging_debug_messaging($op = 'info', $type = NULL) {
  switch($op) {
    case 'send methods':
      $info['debug'] = array(
        'title' => t('Debug'),
        'name' => t('Debug'),
        'destination' => 'name',
        'type' => MESSAGING_TYPE_PUSH,
        'glue' => '<br />',
        'description' => t('The messages will be just logged (And printed on page if Devel module enabled).'),
        'send callback' => 'messaging_debug_send_msg',
      );
      return $info;
  }        
}

/**
 * Implementation of hook_action_info().
 */
function messaging_debug_action_info() {
  return array(
    'messaging_debug_watchdog_msg' => array(
      'type' => 'messaging',
      'description' => t('Log message to watchdog'),
      'configurable' => FALSE,
      'hooks' => array(
        'messaging' => array('incoming', 'outgoing'),
      ),
    ),
    'messaging_debug_devlog_msg' => array(
      'description' => t('Log message through devel module'),
      'type' => 'messaging',
      'configurable' => FALSE,
      'hooks' => array(
        'messaging' => array('incoming', 'outgoing'),
      )
    ),
    'messaging_debug_block_msg' => array(
      'description' => t('Display message in block'),
      'type' => 'messaging',
      'configurable' => FALSE,
      'hooks' => array(
        'messaging' => array('incoming', 'outgoing'),
      )
    ),
  );
}

/**
 * Implementation of hook_messaging_methods_alter()
 */
function messaging_debug_messaging_methods_alter(&$info) {
  // If debug enabled, replace all send callbacks
  if (variable_get('messaging_debug', 0)) {
    foreach (array_keys($info) as $method) {
      $info[$method]['send callback'] = _messaging_callback('messaging_debug_send_msg');
      //$info[$method]['user callback'] = _messaging_callback('messaging_debug_send_user');
    }
  }
}

/**
 * Messaging processor
 */
function messaging_debug_watchdog_msg($message, $context) {
  list($text, $variables) = _messaging_debug_log_text($message);
  watchdog('messaging', $text, $variables);

  // Return message without changes for further processing
  return $message;
}

/**
 * Message processor, just log incoming messages
 */
function messaging_debug_devlog_msg($message, $context) {
  if (module_exists('devel')) {
    list($text, $variables) = _messaging_debug_log_text($message);
    dsm($message, t($text, $variables));
  }

  // Return message without changes for further processing
  return $message;
}

/**
 * Message processor, store for display in a block
 */
function messaging_debug_block_msg($message, $context) {
  $_SESSION['messaging_debug_store'][] = $message;
  return $message;
}

/**
 * Format message as loggable text
 */
function _messaging_debug_log_text($message) {
  $source = $message->source;
  $variables = array(
    '%subject' => $message->subject,
  );
  if ($source['type'] == 'incoming') {
    $text = 'Incoming message, method %method, channel %channel: %subject';
    $variables +=  array('%method' => $source['method'], '%channel' => $source['channel']);  
  } elseif ($source['type'] == 'outgoing') {
    $text = 'Outgoing message, method %method: %subject';
    $variables += array('%method' => $message->method);  
  } else {
    $text = 'Unknown message type, full dump: %message';
    $variables['%message'] = print_r($message, TRUE);
  }
  return array($text, $variables);
}

/**
 * Just show message title to the user. 
 * 
 * This is a pull method though, so this is mainly intended for testing options
 */
function messaging_debug_send_msg($destination, &$message) {
  // Just logs everything and mark the message for logging too.
  $message->log = 1;
  $text = '';
  $watchdog = array();
  $text  = t('Message %key for %name: %subject', array('%name' => $destination, '%key' => $message->type, '%subject' => $message->subject));
  messaging_log($text);
  // Just log message body at the end
  watchdog('messaging', 'Message %key for %name: %subject <br /> Message body: <br /><pre>!body</pre>', array('%name' => $destination, '%key' => $message->type, '%subject' => $message->subject, '!body' => $message->body));
  return TRUE;
}

/**
 * Implementation of hook_footer()
 * 
 * Only debugging functionality for administrators, uses devel module facility
 */
function messaging_debug_footer() {
  if (variable_get('messaging_debug', 0) && user_access('administer messaging') && ($logs = messaging_log()) && function_exists('dsm')) {
    foreach ($logs as $log) {
      dsm($log);
    }
  }
}