<?php

/**
 * @file
 * Advanced CSS/JS aggregation external compression module.
 */

// Core hook implementations.
/**
 * Implements hook_menu().
 */
function advagg_ext_compress_menu() {
  $file_path = drupal_get_path('module', 'advagg_ext_compress');
  $config_path = advagg_admin_config_root_path();

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

  return $items;
}

// Contrib hook implemtations.
/**
 * Implements hook_advagg_js_compress_configuration_alter().
 */
function advagg_ext_compress_advagg_js_compress_configuration_alter(&$options_desc, &$compressors, &$functions) {
  list($options, $description) = $options_desc;

  $key = 10;
  while (isset($options[$key])) {
    $key++;
  }
  $options[$key] = t('AdvAgg Command Line Compressor');
  $compressors[$key] = 'advagg_cmdline';
  $functions[$key] = 'advagg_ext_compress_js_compress';

  $options_desc = array($options, $description);
}

/**
 * Implements hook_advagg_css_compress_configuration_alter().
 */
function advagg_ext_compress_advagg_css_compress_configuration_alter(&$options_desc, &$compressors, &$functions) {
  list($options, $description) = $options_desc;

  $key = 10;
  while (isset($options[$key])) {
    $key++;
  }
  $options[$key] = t('AdvAgg Command Line Compressor');
  $functions[$key] = 'advagg_ext_compress_css_compress';

  $options_desc = array($options, $description);
}

// Helper functions.
/**
 * Compress Javascript using via command line.
 *
 * @param string $input_file
 *   The file containing the uncompressed css/js data.
 * @param string $ext
 *   The string css or js.
 *
 * @return string
 *   The file containting the compressed css/js data.
 */
function advagg_ext_compress_execute_cmd($input_file, $ext = '') {
  // Get file extension.
  if (empty($ext)) {
    $ext = strtolower(pathinfo($input_file, PATHINFO_EXTENSION));
    if ($ext !== 'css' && $ext !== 'js') {
      // Get the $ext from the database,
      $row = db_select('advagg_files', 'af')
        ->fields('af')
        ->condition('filename', $input_file)
        ->execute()->fetchAssoc();
      if (!empty($row['filetype'])) {
        $ext = $row['filetype'];
      }
      if ($ext === 'less') {
        $ext = 'css';
      }
    }
  }

  // Generate temp file.
  $temp_file = drupal_tempnam('temporary://', 'file_advagg_');
  $new_temp_file = $temp_file . '.' . basename($input_file);
  @rename($temp_file, $new_temp_file);
  $output = advagg_get_relative_path($new_temp_file);

  // Create command to run.
  $run = variable_get("advagg_ext_compress_{$ext}_cmd", '');
  $run = str_replace(array(
    '{%CWD%}',
    '{%IN%}',
    '{%IN_URL_ENC%}',
    '{%OUT%}',
  ), array(
    DRUPAL_ROOT,
    $input_file,
    urlencode(file_create_url($input_file)),
    escapeshellarg(realpath($output)),
  ), $run);

  // Run command and return the output file.
  shell_exec($run);
  return $output;
}

/**
 * Compress Javascript using via command line.
 *
 * @param string $contents
 *   The JavaScript to compress.
 */
function advagg_ext_compress_js_compress(&$contents) {
  list(, $js_path) = advagg_get_root_files_dir();
  $temp_file = drupal_tempnam($js_path[0], 'file_advagg_');
  $new_temp_file = $temp_file . '.js';
  rename($temp_file, $new_temp_file);
  $temp_file_full = advagg_get_relative_path($new_temp_file);

  file_put_contents($new_temp_file, $contents);
  $output = advagg_ext_compress_execute_cmd($temp_file_full, 'js');
  $contents = file_get_contents($output);

  // Cleanup.
  unset($new_temp_file);
  unset($temp_file_full);
  unset($output);
}

/**
 * Compress CSS using via command line.
 *
 * @param string $contents
 *   The CSS to compress.
 */
function advagg_ext_compress_css_compress(&$contents) {
  list($css_path) = advagg_get_root_files_dir();
  $temp_file = drupal_tempnam($css_path[0], 'file_advagg_');
  $new_temp_file = $temp_file . '.css';
  rename($temp_file, $new_temp_file);
  $temp_file_full = advagg_get_relative_path($new_temp_file);

  file_put_contents($new_temp_file, $contents);
  $output = advagg_ext_compress_execute_cmd($temp_file_full, 'css');
  $contents = file_get_contents($output);

  // Cleanup.
  unset($new_temp_file);
  unset($temp_file_full);
  unset($output);
}