<?php

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

// Contrib hook implementations.
/**
 * Implements hook_advagg_current_hooks_hash_array_alter().
 */
function advagg_ext_minify_advagg_current_hooks_hash_array_alter(&$aggregate_settings) {
  $aggregate_settings['variables']['advagg_ext_minify'] = \Drupal::config('advagg_ext_minify.settings')->get();
}

/**
 * Implements hook_advagg_js_minify_configuration_alter().
 */
function advagg_ext_minify_advagg_js_minify_configuration_alter(&$options_desc, &$compressors, &$functions) {

  // Test that shell_exec works - may be disabled on many hosts.
  if (!@shell_exec('ls') && !@shell_exec('dir')) {
    return;
  }

  // Test that an command has been configured.
  if (!\Drupal::config('advagg_ext_minify.settings')->get('js_cmd')) {
    return;
  }

  list($options, $description) = $options_desc;
  $options[] = t('AdvAgg Command Line Minifier');
  $compressors[] = 'advagg_cmdline';
  $functions[] = 'advagg_ext_minify_js_minify';

  $options_desc = [$options, $description];
}

/**
 * Implements hook_advagg_css_minify_configuration_alter().
 */
function advagg_ext_minify_advagg_css_minify_configuration_alter(&$options_desc, &$compressors, &$functions) {

  // Test that shell_exec works - may be disabled on many hosts.
  if (!@shell_exec('ls') && !@shell_exec('dir')) {
    return;
  }

  // Test that an command has been configured.
  if (!\Drupal::config('advagg_ext_minify.settings')->get('js_cmd')) {
    return;
  }

  list($options, $description) = $options_desc;
  $options[] = t('AdvAgg Command Line Minifier');
  $compressors[] = 'advagg_cmdline';
  $functions[] = 'advagg_ext_minify_css_minify';

  $options_desc = [$options, $description];
}

// Helper functions.
/**
 * Minify JavaScript via the command line.
 *
 * @param string $input_file
 *   The file containing the unaltered js data.
 * @param string $ext
 *   The string css or js.
 *
 * @return string
 *   The file containing the minified js data.
 */
function advagg_ext_minify_execute_cmd($input_file, $ext = '') {
  // Get file extension.
  if (empty($ext)) {
    $ext = strtolower(pathinfo($input_file, PATHINFO_EXTENSION));
    if ($ext !== 'css' && $ext !== 'js') {
      $info = \Drupal::service('state.advagg.files')->get($input_file);
      $ext = $info['fileext'];
    }
  }

  // Generate temp file.
  $temp_file = \Drupal::service("file_system")->tempnam('temporary://', 'file_advagg_');
  $new_temp_file = $temp_file . '.' . basename($input_file);
  @rename($temp_file, $new_temp_file);
  $output = \Drupal::service('file_system')->realpath($new_temp_file);
  $run = \Drupal::config('advagg_ext_minify.settings')->get($ext . '_cmd');

  $run = str_replace([
    '{%CWD%}',
    '{%IN%}',
    '{%IN_URL_ENC%}',
    '{%OUT%}',
  ], [
    \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;
}

/**
 * Minify Javascript using via command line.
 *
 * @param string $contents
 *   The JavaScript to minify.
 */
function advagg_ext_minify_js_minify(&$contents) {
  $js_path = \Drupal::config('advagg.settings')->get('root_dir_prefix') . 'advagg_js';
  $temp_file = \Drupal::service("file_system")->tempnam($js_path, '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);
  $output = advagg_ext_minify_execute_cmd($temp_file_full, 'js');
  $contents = file_get_contents($output);

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

/**
 * Minify CSS using via command line.
 *
 * @param string $contents
 *   The CSS to minify.
 */
function advagg_ext_minify_css_minify(&$contents) {
  $css_path = \Drupal::config('advagg.settings')->get('root_dir_prefix') . 'advagg_css';
  $temp_file = \Drupal::service("file_system")->tempnam($css_path, '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);
  $output = advagg_ext_minify_execute_cmd($temp_file_full, 'css');
  $contents = file_get_contents($output);

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