<?php 

/**
* Implementation of hook_init()
*/
function drupalforfirebug_init() {
  // Do nothing 
}

/**
 * Implementation of hook_example()
 */
function drupalforfirebug_exit() {
  $dff = TRUE;

  // Try not to break non html pages. [from new devel.module]                     
  if (function_exists('drupal_get_http_header')) {
    $header = drupal_get_http_header('content-type');
    if ($header) {
      $formats = array('xml', 'javascript', 'json', 'plain', 'image', 'application', 'csv', 'x-comma-separated-values');
      foreach ($formats as $format) {
        if (strstr($header, $format)) {
          $dff = FALSE;
        }
      }
    }
  }                    

  // Exclude AJAX Functionality from Ctools
  if (arg(1) == 'ajax' || arg(3) == 'ajax') {
    $dff = FALSE;
  }

  // Try not to break non html pages. [from new devel.module]                     
  if (function_exists('drupal_get_http_header')) {
    $header = drupal_get_http_header('content-type');
    if ($header) {
      $formats = array('xml', 'javascript', 'json', 'plain', 'image', 'application', 'csv', 'x-comma-separated-values');
      foreach ($formats as $format) {
        if (strstr($header, $format)) {
          $dff = FALSE;
        }
      }
    }
  }

  // Check with Devel if Installed
  if (module_exists('devel')) {
    if (drupal_is_cli()) {
      $dff = FALSE;
    }
  }
  
  global $_drupalforfirebug_enable_output;
  if($_drupalforfirebug_enable_output !== TRUE) {
    $dff = FALSE;
  }

  if ($dff) {
    // Load Relevant Files and Register Shutdown
    drupal_load('module', 'user');
    register_shutdown_function('drupalforfirebug_shutdown');

    // Load the SQL Query Information
    global $queries;
    $queries = Database::getLog('devel', 'default');
  }
}

/**
 * Implementation of hook_menu()
 */
function drupalforfirebug_menu() {
  $items['admin/firebug/exec'] = array(
    'page callback' => 'drupalforfirebug_get_exec_php_callback',
    'access arguments' => array('access content'),
    'type' => MENU_CALLBACK,
  );
  return $items;
}

/**
*  Implementation of hook_nodes() 
* TODO - are there other hooks we want to track?
*/
function drupalforfirebug_node_delete($node) {
  drupalforfirebug_node_process($node, 'delete');
}
function drupalforfirebug_node_insert($node) {
  drupalforfirebug_node_process($node, 'insert');
}
function drupalforfirebug_node_load($nodes, $types) {
  foreach($nodes as $node) {
    // TOOD - make this work
    drupalforfirebug_node_process($node, 'load');
  }
}
function drupalforfirebug_node_update($node) {
  drupalforfirebug_node_process($node, 'update');
}
function drupalforfirebug_node_validate($node) {
  drupalforfirebug_node_process($node, 'validate');
}
function drupalforfirebug_node_view($node) {
  drupalforfirebug_node_process($node, 'view');
}

/**
* Processing function for Node API
*/
function drupalforfirebug_node_process(&$node, $op) {
  global $dfp_runtime;
  if (!user_access('Access Firebug Debug')) {
    return;
  }
  $nid = (isset($node->nid)) ? $node->nid : '*'. t('NEW') . '*';
  $data = drupalforfirebug_array_compare((array) $dfp_runtime['drupalforfirebug_nodes']['original'][$node->type][$nid], (array) $node);
  $output = drupalforfirebug_field_object('node', $nid, $op, $data);
  drupalforfirebug_log($output, 'hook_nodeapi');
}

/**
* Implementation of hook_views_pre_view();
*/
function drupalforfirebug_views_pre_view(&$view, &$display_id) {
  global $dfp_runtime;
  if (!user_access('Access Firebug Debug')) {
    return;
  }
  $data = drupalforfirebug_array_compare((array) $dfp_runtime['drupalforfirebug_views']['original'][$view->name], (array) $view);
  $output = drupalforfirebug_field_object('view', $view->name, NULL, $data);
  drupalforfirebug_log($output, 'hook_views');
}

/**
* Implementation of hook_page_alter()
*/
function drupalforfirebug_page_alter(&$page) {
  global $dfp_runtime;
  global $_drupalforfirebug_enable_output;
  $_drupalforfirebug_enable_output = TRUE;
  // TODO - make this work without recursion problems
  // $data = drupalforfirebug_array_compare((array) $dfp_runtime['drupalforfirebug_page']['original']['page'], (array) $page);
  // $output = drupalforfirebug_field_object('page', 'page', NULL, $data);
  $output = t('Page Alter Support is Not Yet Implemented');
  drupalforfirebug_log($output, 'hook_page_alter');
}

/**
*  Implementation of hook_form_alter()
*/
function drupalforfirebug_form_alter(&$form, &$form_state, $form_id) {
  global $dfp_runtime;
  if (!user_access('Access Firebug Debug')) {
    return;
  }
  if ($form_id != 'drupalforfirebug_execute_form') {
    $form_modified = (array) $form;
    $data = drupalforfirebug_array_compare($dfp_runtime['drupalforfirebug_forms']['original'][$form_id], $form_modified);
    $output = drupalforfirebug_field_object('form', $form_id, NULL, $data);
    drupalforfirebug_log($output, 'hook_form_alter');
  }
}

/**
* Implementation of hook_users()
*/
function drupalforfirebug_user_insert(&$edit, $account, $category) {
  drupalforfirebug_user_processing('insert', $account);
}
function drupalforfirebug_user_load($users) {
  foreach($users as $account) {
    drupalforfirebug_user_processing('insert', $account);
  }
}
// TODO - more user hook stuff

/**
* Processor for Hook Usering
*/
function drupalforfirebug_user_processing($op, &$account) {
  global $dfp_runtime;
  if (!user_access('Access Firebug Debug')) {
    return;
  }
  if (isset($account->uid)) { 
    $uid = $account->uid;
    $name = $account->name;
  } else {
    $uid = '*' . t('NEW') . '*';
    $name = '*' . t('NEW') . '*';
  }
  if (is_object($account)) {
    $account_clone = clone($account);
    $account_clone->pass = '**' . t('Not shown for security reasons') . '**';
    $data = drupalforfirebug_array_compare((array) $account_clone, (array) $account_clone);
    $output = drupalforfirebug_field_object('user', $uid, $op, $data);
    drupalforfirebug_log($output, 'hook_user');
  }
}

/**
* API Function to Record a Message to the Drupal Firebug Log
*/
function drupalforfirebug_log($message, $type = 'general') {
  global $dfp_runtime;
  $dfp_runtime['firebug_messages'][$type][] = $message;
}

/**
* Command Function to Record a Data Element to the Drupal Firebug Log
*/
function firep($element, $title = NULL) {
  if ($title) {
    drupalforfirebug_log('<strong>'.$title.':</strong>');
  }
  drupalforfirebug_log('<PRE>'. print_r($element, true) . '<br><br></PRE>', 'general');
}

/**
* Output Function to Return the Results of the Log
*/
function drupalforfirebug_get($panetype) {
  global $dfp_runtime;
  $output = '';
  if (isset($dfp_runtime['firebug_messages'][$panetype])) {
    foreach($dfp_runtime['firebug_messages'][$panetype] as $message) {
      $output .= '<div>' . $message .'</div>';
    }
    unset($dfp_runtime['firebug_messages'][$panetype]);
    return $output;
  }
}

/**
* Output Function to Return the Results of the SQL Log
*/
function drupalforfirebug_get_sql_log() {
  $output = '<fieldset>';
  if (!module_exists('devel')) {
    $output .= '<legend>' . t('Devel Module is Not Installed') . '</legend>';
    $output .= t('Please install and enable the Devel Module to display the SQL queries.');
  } elseif (!variable_get('devel_query_display', 0)) {
    $output .= '<legend>' . t('Query Logging is Not Enabled') . '</legend>';
    $output .= t('Please enable "Display query info" in the Devel Module Settings (devel/settings) to use this feature.');
  } else {
    if (function_exists('theme_get_registry') && theme_get_registry()) {
      global $queries;
      list($counts, $query_summary) = devel_query_summary($queries);
      $output .= '<legend>' . t('SQL Query Log') . '</legend>';
      $output .= $query_summary;
      $output .= drupalforfirebug_devel_query_table($queries, $counts);
    }
  }
  $output .= '</fieldset>'; 
  return $output;
}

/** 
* Generates an Execute PHP Drupal For Firebug Form
**/
function drupalforfirebug_execute_form() {
  $form['code'] = array(
    '#type' => 'textarea',
    '#rows' => 2,
    '#description' => t('Enter PHP code for execution. Do not use <code>&lt;?php ?&gt;</code> tags.')
  );
  $form['token'] = array(
    '#type' => 'hidden',
    '#value' => drupal_get_token(),
  );
  $form['op'] = array('#type' => 'submit', '#value' => t('Execute'));
  $form['#redirect'] = FALSE;
  $form['#action'] = url('admin/firebug/exec', array('absolute' => TRUE));
  $form['#skip_duplicate_check'] = TRUE;
  return $form; 
}

function drupalforfirebug_get_php_exec_area() {
  $output = '<object style="width:100%;frameborder:0;height:100%;margin-bottom:-3px;" type="text/html" data="' . url('admin/firebug/exec', array('absolute' => TRUE)) . '"></object>';
  return $output;
}

function drupalforfirebug_get_php_exec($code = NULL, $token = NULL) {
  $output = '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">';
  $output .= '<html><head><title>Execute PHP Code</title>';
  $output .= drupal_get_js();
  $output .= '</head><body>';
  $output .= '<fieldset>';
  if (!user_access('Execute Firebug PHP') || (!is_null($code) && !drupal_valid_token($token))) {
    $output .= '<legend>' . t('Execute Firebug PHP') . '</legend>';
    $output .= t('You do not have the proper permissions to use this functionality.');
    $output .= '</fieldset></body></html>';
    print $output;
    exit();
  } else {
    if (!$code) {
      $output .= '<legend>' . t('Execute Firebug PHP') . '</legend>';
      $dff_exec_form = drupal_get_form('drupalforfirebug_execute_form');
      $output .= drupal_render($dff_exec_form);
      $output .= '</fieldset></body></html>';
      print $output;
      exit();
    } else {
      $output = '<legend>' . t('PHP Code Execution Results') . '</legend>';

      // Run the PHP command, get output in variable
      ob_start();
      eval($code);
      $eval_result = ob_get_contents();
      ob_end_clean();

      $output .= '<PRE>' . $eval_result . '</PRE>';
      $output .= '</fieldset></body></html>';
      print $output;
      exit();
    }
  }
}

/**
 * Outputs a Execute PHP Form
 */
function drupalforfirebug_get_exec_php_callback() {
  $code = (isset($_POST['code'])) ? $_POST['code'] : NULL;
  $token = (isset($_POST['token'])) ? $_POST['token'] : NULL;
  return drupalforfirebug_get_php_exec($code, $token);
}

/**
* Output Function to Return Hidden Div Containers in Footer
*/
function drupalforfirebug_shutdown() {
  if (!user_access('Access Firebug Debug')) {
    return;
  }
  $output = '<div style="display: none" id="drupalforfirebug_general">';
  $output .= '<fieldset>';
  $output .= '<legend>' . t('Drupal for Firebug General Messages') . '</legend>';
  $general_messages = drupalforfirebug_get('general');
  $output .= $general_messages;
  if (!$general_messages) {
    $output .= t('There were no messages sent to the general log. Please use "firep($item, $optional_title)" to output messages to this console.');
  }
  $output .= '</div>';
  $output .= '<div style="display: none" id="drupalforfirebug_sql">';
  $output .= drupalforfirebug_get_sql_log();
  $output .= '</div>';
  $output .= '<div style="display: none" id="drupalforfirebug_hook_form_alter">';
  $output .= $form_alter_output = drupalforfirebug_get('hook_form_alter');
  if (!$form_alter_output) { $output .= t('There was no form altering.'); }
  $output .= '</div>';
  $output .= '<div style="display: none" id="drupalforfirebug_hook_user">';
  $output .= $user_output = drupalforfirebug_get('hook_user');
  if (!$user_output) { $output .= t('There was no user processing.'); }
  $output .= '</div>';
  $output .= '<div style="display: none" id="drupalforfirebug_hook_nodeapi">';
  $output .= $node_api_output = drupalforfirebug_get('hook_nodeapi');
  if (!$node_api_output) { $output .= t('There was no node processing.'); }
  $output .= '</div>';
  $output .= '<div style="display: none" id="drupalforfirebug_hook_views">';
  if (module_exists('views')) {
    $output .= $views_output = drupalforfirebug_get('hook_views');
    if (!$views_output) { $output .= t('There was no views processing.'); }
  } else {
    $output .= t('The views module is not installed.');
  }
  $output .= '</div>';
  $output .= '<div style="display: none" id="drupalforfirebug_hook_page_alter">';
  $output .= $page_output = drupalforfirebug_get('hook_page_alter');
  if (!$page_output) { $output .= t('There was no page processing.'); }
  $output .= '</div>';
  $output .= '<div style="display: none" id="drupalforfirebug_php">';
  $output .= drupalforfirebug_get_php_exec_area();
  $output .= '</div>';
  print $output;
  unset($GLOBALS['dfp_runtime']);
}

/**
* Implementation of hook_permission()
*/
function drupalforfirebug_permission() {
  return array(
    'Access Firebug Debug' => array(
      'title' => t('Access Firebug Debug'),
    ),
    'Execute Firebug PHP' => array(
      'title' => t('Execute Firebug PHP'),
    ),
  );
}

/**
* Generalized Array Comparision Function
*/
function drupalforfirebug_array_compare($a, $b) {
  $data = drupalforfirebug_array_compare_code($a, $b);
  $style = drupalforfirebug_array_highlight_code($data);
  return $style;
}

/**
* Specialized Function to Return an Array Row
*/
function drupalforfirebug_array_row_build($key, $value, $style, $depth) {
  $spacing = '';
  for ($x = 0; $x <= $depth; $x++) {
    $spacing .= '&nbsp;&nbsp;&nbsp;&nbsp;';
  }
  switch ($style) {
    case 'ADDED':
      $color = '<span style="color: green;">';
      $colorend = '</span>';
      break;
    case 'REMOVED':
      $color = '<span style="color: red;">';
      $colorend = '</span>';
      break;
    case 'SAME':
      $color = '<span style="color: black;">';
      $colorend = '</span>';
      break;
    case 'DIFFERENT':
      $color = '<span style="color: orange;">';
      $colorend = '</span>';
      break;
    default: // suppose to be for objects
      $color = '<span style="color: grey;">'.$style;
      $colorend = '</span>';
      break;
  }

  $output = '';
  if (is_array($value) || is_object($value)) {
    if ($style == 'DIFFERENT') { // do not highlight if contained item is just changed. 
      $color = '';
      $colorend = '';
    }
    if (is_array($value)) {
      $output .= "<div>$spacing $color [$key] => array ( $colorend </div>";
    } else {
      $output .= '<div>$spacing <span style="color: grey;"> [' . $key .'] => stdClass (' . $colorend .'</div>';
    }
    $output .= drupalforfirebug_array_highlight_code($value, $depth + 1);
    $output .= "<div>$spacing $color ) $colorend </div>";
  } else {
    if (isset($key) || isset($value)) {
      if (is_resource($value)) {
        $output .= "<div>$spacing $color [$key] => RESOURCE $colorend </div>";
      } else {
        $output .= "<div>$spacing $color [$key] => [" . check_plain($value) . "] $colorend </div>";
      }
    }
  }
  return $output;
}

/**
* Specialized Array Data Style Function
*/
function drupalforfirebug_array_highlight_code($data, $depth = 0) {
  // Smartly Handling Recursion for Objects
  if (is_object($data)) {
    $data = (array) $data;
    static $refChain = array();
    foreach ($refChain as $refVal) {
      if ($refVal === $data) {
        $data = array('**' . t('Recursion Detected') . '**');
      }
    }
    array_push($refChain, $data);
  }

  $output = '';
  foreach($data as $key => $value) {
    if ((string) $key != '#firebug_style') {
      if (isset($data['#firebug_style']) && isset($data['#firebug_style'][$key])) {
        $output .= drupalforfirebug_array_row_build($key, $value, $data['#firebug_style'][$key], $depth);
      }
    }
  }
  return $output;
}

/**
* Specialized Array Data Comparision Code
*/
function drupalforfirebug_array_compare_code($a, $b, $c = array(), $history = array()) {
  // Create the Compared Data Object
  $maxcount = count($a) > count($b) ? count($a) : count($b);
  $akeys = is_array($a) ? array_keys($a) : array();
  $bkeys = is_array($b) ? array_keys($b) : array();
  for ($x = 0; $x < $maxcount; $x++) {
    // Set the Proper Styling
    if (isset($akeys[$x]) && array_key_exists($akeys[$x], array_flip($bkeys))) { // is it in B array?
      if ($a[$akeys[$x]] === $b[$akeys[$x]]) {
        $c['#firebug_style'][$akeys[$x]] = 'SAME';
      } else {
        $c['#firebug_style'][$akeys[$x]] = 'DIFFERENT';
      }
    } else { // not in B array, must be removed
      if (isset($akeys[$x])) {
        $c['#firebug_style'][$akeys[$x]] = 'REMOVED';
      }
    }

    // Set the Proper Element
    if (isset($akeys[$x]) && is_array($a[$akeys[$x]]) && $bkeys) { // is b a valid array
      if (isset($c[$akeys[$x]])) {
        $aval = &$a[$akeys[$x]];
        $bval = &$b[$akeys[$x]];
        $cval = &$c[$akeys[$x]];
        $c[$akeys[$x]] = drupalforfirebug_array_compare_code($aval, $bval, $cval);
      } else {
        $aval = &$a[$akeys[$x]];
        $bval = &$b[$akeys[$x]];
        $c[$akeys[$x]] = drupalforfirebug_array_compare_code($aval, $bval, array());
      }
    } else {
      if (isset($akeys[$x]) && array_key_exists($akeys[$x], array_flip($bkeys))) { // is it in B array?
        if ($a[$akeys[$x]] === $b[$akeys[$x]]) {
          $c[$akeys[$x]] = $a[$akeys[$x]];
        } else {
          $c[$akeys[$x]] = $b[$akeys[$x]];
        }
      } else { // not in B array, must be removed
        if (isset($akeys[$x])) {
          $c[$akeys[$x]] = $a[$akeys[$x]];
        }
      }
    }
    if (isset($bkeys[$x]) && isset($b[$bkeys[$x]])) { // does b have a valid argument
      // Set the Proper Styling
      if (array_key_exists($bkeys[$x], array_flip($akeys))) { // is it in A array? 
        // exists in the A array, already processed
      } else {
        $c[$bkeys[$x]] = $b[$bkeys[$x]];
        $c['#firebug_style'][$bkeys[$x]] = 'ADDED';
      }

      // Set the Proper Element
      $aval = &$a[$bkeys[$x]];
      $bval = &$b[$bkeys[$x]];
      $cval = &$c[$bkeys[$x]];
      if (isset($bval) && is_array($bval) && isset($aval) && isset($cval)) { // is b a valid array
        $c[$bkeys[$x]] = drupalforfirebug_array_compare_code($aval, $bval, $cval);
      }
    }
  }
  return $c;
}

// Array Handling Helper Function
function do_offset($level) {
  $offset = "";             // offset for subarry 
  for ($i=1; $i<$level;$i++) {
    $offset = $offset . "<td></td>";
  }
  return $offset;
}

// Array Handling Helper Function
function drupalforfirebug_show_array($array, $level, $sub){
  $output = '';
  if (is_array($array) == 1){          // check if input is an array
    foreach($array as $key_val => $value) {
      $offset = "";
      if (is_array($value) == 1){   // array is multidimensional
        $output .= "<tr>";
        $offset = do_offset($level);
        $output .= $offset . "<td>" . $key_val . "</td>";
        $output .= drupalforfirebug_show_array($value, $level+1, 1);
      }
      else{                        // (sub)array is not multidim
        if ($sub != 1){          // first entry for subarray
          $output .= "<tr nosub>";
          $offset = do_offset($level);
        }
        $sub = 0;
        $output .= $offset . "<td main ".$sub." width=\"120\">" . $key_val .
          "</td><td width=\"120\">" . $value . "</td>";
        $output .= "</tr>\n";
      }
    } //foreach $array
  }
  return $output;
}

// Function to Show an Array
function html_drupalforfirebug_show_array($array){
  $output = "<table cellspacing=\"0\" border=\"2\">\n";
  $output .= drupalforfirebug_show_array($array, 1, 0);
  $output .= "</table>\n";
  return $output;
}


/**
 * Function for fieldsets that wrap object dumps
 *
 * For efficiency and consistent behavior in firebug window
 * Use to be a theme function, but that broke things
 */
function drupalforfirebug_field_object($marker, $id, $op = NULL, $data) {
  $output = '<fieldset class="toggler">';
  $output .= '<legend><strong><a href="#"><em>' . $op . '</em> $'. $marker .'->'. $id . '</a></strong></legend>';
  $output .= '<div class="content" style="display: none;">';
  $output .= '<div>' . '&nbsp;$'. $marker .' = (' . '</div>';
  $output .= $data;
  $output .= '<div>' . '&nbsp;);</div>';
  $output .= '</div>';
  $output .= '</fieldset>';

  return $output;
}

/**
* Replication of Devel Query Display (but as a table instead of CSS styled div structure)
* This is done to work with the Firefox extension which has a harder time loading CSS
*/
function drupalforfirebug_devel_query_table($queries, $counts) {
  $version = devel_get_core_version(VERSION);
  $header = array ('ms', '#', 'where', 'query');
  $i = 0;
  $api = variable_get('devel_api_url', 'api.drupal.org');
  foreach ($queries as $query) {
    $function = !empty($query['caller']['class']) ? $query['caller']['class'] . '::' : '';
    $function .= $query['caller']['function'];
    $count = isset($counts[$query['query']]) ? $counts[$query['query']] : 0;

    $diff = round($query['time'] * 1000, 2);
    if ($diff > variable_get('devel_execution', 5)) {
      $cell[$i][] = array ('data' => $diff, 'class' => 'marker');
    }
    else {
      $cell[$i][] = $diff;
    }
    $cell[$i][] = $count;
    $cell[$i][] = l($function, "http://$api/api/function/$function/$version");
    // EXPLAIN only valid for select queries.
    // 3 divs for each variation of the query. Last 2 are hidden by default.
    $placeholders = '<div class="dev-placeholders">' . check_plain($query['query']) . "</div>\n";
    $args = '<div class="dev-arguments" style="display: none;"></div>' . "\n";
    $explain = '<div class="dev-explain" style="display: none;"></div>' . "\n";
    $cell[$i][] = array(
      'id' => "devel-query-$i",
      'data' => $placeholders . $args . $explain,
    );
    $i++;
    unset($diff, $count, $ops);
  }
  if (variable_get('devel_query_sort', DEVEL_QUERY_SORT_BY_SOURCE)) {
    usort($cell, '_devel_table_sort');
  }
  return theme('table', array('header' => $header, 'rows' => $cell));
}