<?php

/**
 * @file
 * Enable the administration theme on more pages,
 * then possible with Drupal's default administration page.
 */

/**
 * Implements hook_permission().
 */
function admin_theme_permission() {
  return array(
    'access admin theme' => array(
      'title' => t('Access administration theme'),
      'description' => t('View pages using the administration theme'),
    )
  );
}

/**
 * Get the variable name for a certain option.
 *
 * @param string $module
 *   Module that defines this option.
 * @param string $params
 *   Name of the option.
 * 
 * @return string
 *   Variable name for the option.
 */
function admin_theme_variable_name($module, $option) {
  return 'admin_theme_' . $module . '_' . $option;
}

/**
 * Get all module defined options.
 *
 * @return array
 *   All options.
 */
function admin_theme_list() {
  $options = array();
  foreach (module_list() as $module) {
    $module_options = module_invoke($module, 'admin_theme_info');
    if ($module_options && count($module_options) > 0) {
      foreach ($module_options as $option => $info) {
        $info['option'] = $option;
        $info['module'] = $module;
        $options[] = $info;
      }
    }
  }
  return $options;
}

/**
 * Implements hook_form_alter().
 */
function admin_theme_form_system_themes_admin_form_alter(&$form, $form_state) {
  // Define a fieldset for the page selection.
  $form['admin_theme']['pages'] = array(
    '#type' => 'fieldset',
    '#title' => t('Pages'),
    '#collapsible' => TRUE,
    '#description' => t('Choose which pages should be displayed with the administration theme.'),
  );

  // Add the content editing option to the pages fieldset and change the title.
  $form['admin_theme']['pages']['node_admin_theme'] = $form['admin_theme']['node_admin_theme'];
  $form['admin_theme']['pages']['node_admin_theme']['#title'] = t('Content editing');
  unset($form['admin_theme']['node_admin_theme']);

  // Add all options as checkboxes to the admin theme settings form.
  $list = admin_theme_list();
  foreach ($list as $info) {
    $var = admin_theme_variable_name($info['module'], $info['option']);
    $form['admin_theme']['pages'][$var] = array(
      '#type' => 'checkbox',
      '#title' => array_key_exists('title', $info) ? $info['title'] : NULL,
      '#description' => array_key_exists('description', $info) ? $info['description'] : NULL,
      '#default_value' => variable_get($var, '0'),
    );
  }

  // Allow the user to define a set of pages where the admin theme should,
  // or should not be applied to.
  $form['admin_theme']['pages']['custom'] = array(
    '#type' => 'fieldset',
    '#title' => t('Custom'),
    '#description' => t("Enter one page per line as Drupal paths. The '*' character is a wildcard. Example paths are %blog for the blog page and %blog-wildcard for every personal blog. %front is the front page.", array('%blog' => 'blog', '%blog-wildcard' => 'blog/*', '%front' => '<front>')),
    '#collapsible' => TRUE,
    '#collapsed' => TRUE,
    '#weight' => 9,
  );
  $form['admin_theme']['pages']['custom']['admin_theme_path'] = array(
    '#type' => 'textarea',
    '#title' => t('Use administration theme on the following pages'),
    '#default_value' => variable_get('admin_theme_path', ''),
  );
  $form['admin_theme']['pages']['custom']['admin_theme_path_disallow'] = array(
    '#type' => 'textarea',
    '#title' => t('Do not use administration theme on the following pages'),
    '#description' => t('If a path appears here, the administration theme is not shown even if all above options apply.'),
    '#default_value' => variable_get('admin_theme_path_disallow', ''),
  );
  
  $form['#submit'][] = 'admin_theme_form_system_themes_form_alter_submit';
  
  $form['admin_theme']['actions']['#weight'] = 10;
}

/**
 * Process system_themes_form additions submissions.
 */
function admin_theme_form_system_themes_form_alter_submit($form, &$form_state) {
  // Module options.
  $list = admin_theme_list();
  foreach ($list as $info) {
    $var = admin_theme_variable_name($info['module'], $info['option']);
    if (isset($form_state['values'][$var])) {
      variable_set($var, $form_state['values'][$var]);
    }
  }
  
  // Custom page options.
  variable_set('admin_theme_path', $form_state['values']['admin_theme_path']);
  variable_set('admin_theme_path_disallow', $form_state['values']['admin_theme_path_disallow']);
}

/**
 * Implements hook_custom_theme().
 */
function admin_theme_custom_theme() {
  $admin_theme_disallow = FALSE;
  $admin_theme = FALSE;
  
  // Check if some paths are disallow to get the theme.
  if (trim(variable_get('admin_theme_path_disallow', '')) != '') {
    // Pages that are defined by their normal path.
    $admin_theme_disallow = drupal_match_path($_GET['q'], variable_get('admin_theme_path_disallow', ''));
    
    // Pages that are defined with their alias.
    $alias = drupal_get_path_alias($_GET['q']);
    if ($alias != $_GET['q']) {
      $admin_theme_disallow = $admin_theme || drupal_match_path($alias, variable_get('admin_theme_path_disallow', ''));
    }
  }

  // We should not show the admin theme if the user has no access,
  // or the path is in the disallow list.
  if (!user_access('access admin theme') || $admin_theme_disallow) {
    return;
  }
  
  // Check if an option is enabled and if it results to TRUE.
  $list = admin_theme_list();
  foreach ($list as $info) {
    $var = admin_theme_variable_name($info['module'], $info['option']);
    if ((bool)variable_get($var, '0') && module_invoke($info['module'], 'admin_theme', 'check', $info['option'])) {
      $admin_theme = TRUE;
    }
  }
  
  // Some custom defined pages should get admin theme.
  if (trim(variable_get('admin_theme_path', '')) != '') {
    // Pages that are defined by their normal path.
    $admin_theme = $admin_theme || drupal_match_path($_GET['q'], variable_get('admin_theme_path', ''));

    // Pages that are defined with their alias.
    $alias = drupal_get_path_alias($_GET['q']);
    if ($alias != $_GET['q']) {
      $admin_theme = $admin_theme || drupal_match_path($alias, variable_get('admin_theme_path', ''));
    }
  }
  // Use the admin theme for the current request (if global admin theme setting is checked).
  if ($admin_theme) {
    return variable_get('admin_theme');
  }
  
  return;
}

/**
 * Implements hook_admin_theme_info().
 */
function admin_theme_admin_theme_info() {
  $options = array();
  $options['batch'] = array(
    'title' => t('Batch processing'),
    'description' => t('Use the administration theme when executing batch operations.'),
  );
  if (module_exists('img_assist')) {
    $options['img_assist'] = array(
      'title' => t('Image assist'),
      'description' => t('Use the administration theme when viewing the Image assist popup window.'),
    );
  }
  if (module_exists('coder')) {
    $options['coder'] = array(
      'title' => t('Code reviews'),
      'description' => t('Use the administration theme when viewing Coder code reviews.'),
    );
  }
  if (module_exists('devel')) {
    $options['devel'] = array(
      'title' => t('Devel pages.'),
      'description' => t('Use the administration theme when viewing pages of the devel module (hook_elements(), Dev render, Dev load, Session viewer, Theme registery, Variable editor, ...).'),
    );
  }
  if (module_exists('service_attachments')) {
    $options['service_attachments'] = array(
      'title' => t('Service attachments form on nodes.'),
      'description' => t('Use the administration theme when viewing service attachments on nodes.'),
    );
  }
  if (module_exists('webform')) {
    $options['webform_results'] = array(
      'title' => t('Webform submissions.'),
      'description' => t('Use the administration theme when viewing webform submissions.'),
    );
  }
  if (module_exists('statistics')) {
    $options['statistics'] = array(
      'title' => t('Pages defined by the statistics module.'),
      'description' => t('Use the administration theme when viewing pages of the statistics module.'),
    );
  }
  return $options;
}

/**
 * Implements hook_admin_theme_check().
 */
function admin_theme_admin_theme_check($option = NULL) {
  switch ($option) {
    case 'img_assist':
      return arg(0) == 'img_assist';

    case 'coder':
      return arg(0) == 'coder';

    case 'devel':
      return arg(0) == 'devel' || (arg(0) == 'node' && arg(2) == 'devel');

    case 'batch':
      return arg(0) == 'batch';

    case 'service_attachments':
      return arg(0) == 'node' && arg(2) == 'service_attachments';

    case 'webform_results':
      return arg(0) == 'node' && arg(2) == 'webform-results';

    case 'statistics':
      return (arg(0) == 'node' || arg(0) == 'user') && arg(2) == 'track';
  }
}
