<?php

/**
 * @file
 * Advanced aggregation css compression module.
 */

/**
 * Default value for which css compression library to use. 0 is Disabled.
 */
define('ADVAGG_CSS_COMPRESSOR', 2);

/**
 * Default value to see what compressor to use. 0 is Disabled.
 */
define('ADVAGG_CSS_COMPRESS_INLINE', 0);

/**
 * Default value to if inline compression is used if page is not cacheable.
 */
define('ADVAGG_CSS_COMPRESS_INLINE_IF_NOT_CACHEABLE', FALSE);

/**
 * Default value for per file compression settings.
 */
define('ADVAGG_CSS_COMPRESSOR_FILE_SETTINGS', -10);

/**
 * Implements hook_menu().
 */
function advagg_css_compress_menu() {
  $file_path = drupal_get_path('module', 'advagg_css_compress');
  $config_path = advagg_admin_config_root_path();

  $items[$config_path . '/advagg/css-compress'] = array(
    'title' => 'CSS Compression',
    'description' => 'Adjust CSS Compression settings.',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('advagg_css_compress_admin_settings_form'),
    'type' => MENU_LOCAL_TASK,
    'access arguments' => array('administer site configuration'),
    'file path' => $file_path,
    'file' => 'advagg_css_compress.admin.inc',
    'weight' => 10,
  );

  return $items;
}

/**
 * Implements hook_advagg_current_hooks_hash_array_alter().
 */
function advagg_css_compress_advagg_current_hooks_hash_array_alter(&$aggregate_settings) {
  $aggregate_settings['variables']['advagg_css_compressor'] = variable_get('advagg_css_compressor', ADVAGG_CSS_COMPRESSOR);
  $aggregate_settings['variables']['advagg_css_compressor_file_settings'] = variable_get('advagg_css_compressor_file_settings', array());
}

/**
 * Implements hook_advagg_modify_css_pre_render_alter().
 *
 * Used to compress inline css.
 */
function advagg_css_compress_advagg_modify_css_pre_render_alter(&$children, &$elements) {
  // Get variables.
  $compressor = variable_get('advagg_css_compress_inline', ADVAGG_CSS_COMPRESS_INLINE);

  // Do nothing if the compressor is disabled.
  if (empty($compressor)) {
    return;
  }

  // Do nothing if the page is not cacheable and inline compress if not
  // cacheable is not checked.
  if (!variable_get('advagg_css_compress_inline_if_not_cacheable', ADVAGG_CSS_COMPRESS_INLINE_IF_NOT_CACHEABLE) && !drupal_page_is_cacheable()) {
    return;
  }

  module_load_include('inc', 'advagg_css_compress', 'advagg_css_compress.advagg');
  if ($compressor == 2) {
    // Compress any inline CSS with YUI.
    foreach ($children as &$values) {
      if (!empty($values['#value'])) {
        advagg_css_compress_yui_cssmin($values['#value']);
      }
    }
    unset($values);
  }
}

/**
 * Generate the js compress configuration.
 *
 * @return array
 *   Array($options, $description, $compressors, $functions).
 */
function advagg_css_compress_configuration() {
  $description = '';
  $options = array(
    -1 => t('Disable Core'),
    0 => t('Core'),
    2 => t('YUI'),
  );

  $compressors = array();
  $functions = array(
    2 => 'advagg_css_compress_yui_cssmin',
  );

  // Allow for other modules to alter this list.
  $options_desc = array($options, $description);
  drupal_alter('advagg_css_compress_configuration', $options_desc, $compressors, $functions);
  list($options, $description) = $options_desc;

  return array($options, $description, $compressors, $functions);
}