<?php
// $Id:

/**
 * @file
 * Enable AJAX-based loading of selected page elements.
 */

/**
 * Implementation of hook_menu().
 */
function dynamicload_menu($may_cache) {
  $items = array();
  if ($may_cache) {
    $items[] = array(
      'path' => 'dynamicload/js',
      'title' => t('dynamicload'),
      'access' => user_access('access content'),
      'type' => MENU_CALLBACK,
      'callback' => 'dynamicload_js'
     );
  }
  else {
    dynamicload_load();
  }
  return $items;
}

/**
 * Load needed files.
 */
function dynamicload_load() {
  $path = drupal_get_path('module', 'dynamicload');
  module_invoke('jstools', 'add_js', array(
    $path . '/dynamicload.js',
    'misc/progress.js',
  ));
}

/**
 * Send settings to the browser.
 *
 * We do this in the footer because some of the settings are theme-dependent. Typically,
 * hook_footer will be called after the theme is initiated, so we have the correct theme
 * to load data for.
 */
function dynamicload_footer() {
  $settings = variable_get('dynamicload_settings', array());
  // Allow theme-based overrides.
  $theme_data = module_invoke('jstools', 'theme_data', 'dynamicload');
  foreach ($theme_data as $key => $selector) {
    if ($source = array_search($key, $settings)) {
      $settings[$source] = $selector;
    }
    // No theme support, unset.
    else {
      unset($settings[$source]);
    }
  }
  drupal_add_js(array('dynamicload' => $settings), 'setting');
  return '';
}

function dynamicload_form_alter($form_id, &$form) {
  if ($form_id == 'block_admin_configure') {
    $block_id = '#block-' . $form['module']['#value'] . '-' . $form['delta']['#value'];
    $options = array('content' => t('Main content area'));
    $result = db_query('SELECT module, delta FROM {blocks} WHERE status = 1 AND NOT (module = "%s" AND delta = "%s")', $form['module']['#value'], $form['delta']['#value']);
    while ($block = db_fetch_object($result)) {
      $module_blocks = module_invoke($block->module, 'block', 'list');
      $options['#block-' . $block->module . '-' . $block->delta] = t('%info block', array('%info' => $module_blocks[$block->delta]['info']));
    }
    $settings = variable_get('dynamicload_settings', array());
    $form['#submit']['dynamicload_submit'] = array();
    $form['dynamicload'] = array(
      '#type' => 'fieldset',
      '#title' => t('Dynamic loading'),
      '#description' => t('Select whether you want links on this block to be loaded dynamically rather than through a regular page refresh. If you enable this functionality for a block, make sure that you thoroughly test the result, as not all pages will perform as expected when loaded dynamically.'),
      '#collapsible' => true,
      '#weight' => -5
    );
    $form['dynamicload']['dynamicload_apply'] = array(
      '#type' => 'checkbox',
      '#title' => t('Apply dynamic loading'),
      '#default_value' => $settings[$block_id] ? 1 : 0
    );
    $form['dynamicload']['dynamicload_target'] = array(
      '#type' => 'select',
      '#title' => t('Target area'),
      '#default_value' => $settings[$block_id] ? $settings[$block_id] : '#main',
      '#options' => $options,
      '#description' => t('Select the page area for this block\'s links to load into. Only enabled blocks are available.'),
    );
  }
}

function dynamicload_submit($form_id, $edit) {
  dynamicload_set('#block-' . $edit['module'] . '-' . $edit['delta'], $edit['dynamicload_target'], !$edit['dynamicload_apply']);
}

function dynamicload_set($block_id, $target, $remove = FALSE) {
  $settings = variable_get('dynamicload_settings', array());
  if ($remove) {
    unset($settings[$block_id]);
  }
  else {
    $settings[$block_id] = $target;
  }
  variable_set('dynamicload_settings', $settings);
}

function dynamicload_js() {
  if (isset($_POST['href'])) {
    $response = module_invoke('pagearray', 'page', $_POST['href']);
    if ($response['status'] === FALSE) {
      switch ($response['value']) {
        case MENU_NOT_FOUND:
        case NULL:
          $result = array(
            'result' => FALSE,
            'message' => t('Item was not found.'),
          );
          break;
        case MENU_ACCESS_DENIED:
          $result = array(
            'result' => FALSE,
            'message' => t('Access denied.'),
          );
          break;
        case MENU_SITE_OFFLINE:
          $result = array(
            'result' => FALSE,
            'message' => t('Site offline.'),
          );
          break;
      }
    }
    else {

      $extra = '<h1>'. $page['title'] .'</h1>';

      // Only add breadcrumbs, tabs, help, and status messages if we're not rendering into a block (e.g. if we're in the main content area).
      if (strpos($target, 'block-') === FALSE) {
        $extra = $page['breadcrumb'] . $extra . ;
        if ($tabs = theme('menu_local_tasks')) {
         $extra .= $tabs;
        }
        $extra .= $page['help'];
        $extra .= theme('status_messages');
      }
      $result = array(
        'result' => TRUE,
        'content' => $extra . $response['content'],
      );
    }
  }
  else {
    $result = array(
      'result' => FALSE,
      'message' => t('No request found.'),
    );
  }
  print drupal_to_js($result);
  exit();
}