<?php

/**
 * @file
 * Tests the library detection and loading.
 */

/**
 * Implements hook_libraries_info().
 */
function libraries_test_libraries_info() {
  // Test library detection.
  $libraries['example_missing'] = array(
    'name' => 'Example missing',
    'library path' => drupal_get_path('module', 'libraries') . '/tests/missing',
  );
  $libraries['example_undetected_version'] = array(
    'name' => 'Example undetected version',
    'library path' => drupal_get_path('module', 'libraries') . '/tests',
    'version callback' => '_libraries_test_return_version',
    'version arguments' => array(FALSE),
  );
  $libraries['example_unsupported_version'] = array(
    'name' => 'Example unsupported version',
    'library path' => drupal_get_path('module', 'libraries') . '/tests',
    'version callback' => '_libraries_test_return_version',
    'version arguments' => array('1'),
    'versions' => array(
      '2' => array(),
    ),
  );

  $libraries['example_supported_version'] = array(
    'name' => 'Example supported version',
    'library path' => drupal_get_path('module', 'libraries') . '/tests',
    'version callback' => '_libraries_test_return_version',
    'version arguments' => array('1'),
    'versions' => array(
      '1' => array(),
    ),
  );

  // Test the default version callback.
  $libraries['example_default_version_callback'] = array(
    'name' => 'Example default version callback',
    'library path' => drupal_get_path('module', 'libraries') . '/tests/example',
    'version arguments' => array(
      'file' => 'README.txt',
      // Version 1
      'pattern' => '/Version (\d+)/',
      'lines' => 5,
    ),
  );

  // Test a multiple-parameter version callback.
  $libraries['example_multiple_parameter_version_callback'] = array(
    'name' => 'Example multiple parameter version callback',
    'library path' => drupal_get_path('module', 'libraries') . '/tests/example',
    // Version 1
    'version callback' => '_libraries_test_get_version',
    'version arguments' => array('README.txt', '/Version (\d+)/', 5),
  );

  // Test a top-level files property.
  $libraries['example_files'] = array(
    'name' => 'Example files',
    'library path' => drupal_get_path('module', 'libraries') . '/tests/example',
    'version' => '1',
    'files' => array(
      'js' => array('example_1.js'),
      'css' => array('example_1.css'),
      'php' => array('example_1.php'),
    ),
  );

  // Test loading of integration files.
  // Normally added by the corresponding module via hook_libraries_info_alter(),
  // these files should be automatically loaded when the library is loaded.
  $libraries['example_integration_files'] = array(
    'name' => 'Example integration files',
    'library path' => drupal_get_path('module', 'libraries') . '/tests/example',
    'version' => '1',
    'integration files' => array(
      'libraries_test' => array(
        'js' => array('libraries_test.js'),
        'css' => array('libraries_test.css'),
        'php' => array('libraries_test.inc'),
      ),
    ),
  );

  // Test version overloading.
  $libraries['example_versions'] = array(
    'name' => 'Example versions',
    'library path' => drupal_get_path('module', 'libraries') . '/tests/example',
    'version' => '2',
    'versions' => array(
      '1' => array(
        'files' => array(
          'js' => array('example_1.js'),
          'css' => array('example_1.css'),
          'php' => array('example_1.php'),
        ),
      ),
      '2' => array(
        'files' => array(
          'js' => array('example_2.js'),
          'css' => array('example_2.css'),
          'php' => array('example_2.php'),
        ),
      ),
    ),
  );

  // Test variant detection.
  $libraries['example_variant_missing'] = array(
    'name' => 'Example variant missing',
    'library path' => drupal_get_path('module', 'libraries') . '/tests/example',
    'version' => '1',
    'variants' => array(
      'example_variant' => array(
        'files' => array(
          'js' => array('example_3.js'),
          'css' => array('example_3.css'),
          'php' => array('example_3.php'),
        ),
        'variant callback' => '_libraries_test_return_installed',
        'variant arguments' => array(FALSE),
      ),
    ),
  );

  $libraries['example_variant'] = array(
    'name' => 'Example variant',
    'library path' => drupal_get_path('module', 'libraries') . '/tests/example',
    'version' => '1',
    'variants' => array(
      'example_variant' => array(
        'files' => array(
          'js' => array('example_3.js'),
          'css' => array('example_3.css'),
          'php' => array('example_3.php'),
        ),
        'variant callback' => '_libraries_test_return_installed',
        'variant arguments' => array(TRUE),
      ),
    ),
  );

  // Test correct behaviour with multiple versions and multiple variants.
  $libraries['example_versions_and_variants'] = array(
    'name' => 'Example versions and variants',
    'library path' => drupal_get_path('module', 'libraries') . '/tests/example',
    'version' => '2',
    'versions' => array(
      '1' => array(
        'variants' => array(
          'example_variant_1' => array(
            'files' => array(
              'js' => array('example_1.js'),
              'css' => array('example_1.css'),
              'php' => array('example_1.php'),
            ),
            'variant callback' => '_libraries_test_return_installed',
            'variant arguments' => array(TRUE),
          ),
          'example_variant_2' => array(
            'files' => array(
              'js' => array('example_2.js'),
              'css' => array('example_2.css'),
              'php' => array('example_2.php'),
            ),
            'variant callback' => '_libraries_test_return_installed',
            'variant arguments' => array(TRUE),
          ),
        ),
      ),
      '2' => array(
        'variants' => array(
          'example_variant_1' => array(
            'files' => array(
              'js' => array('example_3.js'),
              'css' => array('example_3.css'),
              'php' => array('example_3.php'),
            ),
            'variant callback' => '_libraries_test_return_installed',
            'variant arguments' => array(TRUE),
          ),
          'example_variant_2' => array(
            'files' => array(
              'js' => array('example_4.js'),
              'css' => array('example_4.css'),
              'php' => array('example_4.php'),
            ),
            'variant callback' => '_libraries_test_return_installed',
            'variant arguments' => array(TRUE),
          ),
        ),
      ),
    ),
  );

  // Test the applying of callbacks.
  $libraries['example_callback'] = array(
    'name' => 'Example callback',
    'library path' => drupal_get_path('module', 'libraries') . '/tests/example',
    'version' => '1',
    'versions' => array(
      '1' => array(
        'variants' => array(
          'example_variant' => array(
            // These keys are for testing purposes only.
            'prepare callback' => 'not applied',
            'detect callback' => 'not applied',
            'load callback' => 'not applied',
          ),
        ),
        // These keys are for testing purposes only.
        'prepare callback' => 'not applied',
        'detect callback' => 'not applied',
        'load callback' => 'not applied',
      ),
    ),
    'variants' => array(
      'example_variant' => array(
        // These keys are for testing purposes only.
        'prepare callback' => 'not applied',
        'detect callback' => 'not applied',
        'load callback' => 'not applied',
      ),
    ),
    'callbacks' => array(
      'prepare' => array('_libraries_test_prepare_callback'),
      'detect' => array('_libraries_test_detect_callback'),
      'load' => array('_libraries_test_load_callback'),
    ),
    // These keys are for testing purposes only.
    'prepare callback' => 'not applied',
    'detect callback' => 'not applied',
    'load callback' => 'not applied',
  );

  // This library is used together with libraries_info() to be populated with
  // the defaults.
  $libraries['example_empty'] = array();

  return $libraries;
}

/**
 * Implements hook_libraries_info_file_paths()
 */
function libraries_test_libraries_info_file_paths() {
  return array(drupal_get_path('module', 'libraries_test') . '/example');
}

/**
 * Gets the version of an example library.
 *
 * Returns exactly the version string entered as the $version parameter. This
 * function cannot be collapsed with _libraries_test_return_installed(), because
 * of the different arguments that are passed automatically.
 */
function _libraries_test_return_version($library, $version) {
  return $version;
}

/**
 * Gets the version information from an arbitrary library.
 *
 * Test function for a version callback with multiple arguments. This is an
 * exact copy of libraries_get_version(), which uses a single $option argument,
 * except for the fact that it uses multiple arguments. Since we support both
 * type of version callbacks, detecting the version of a test library with this
 * function ensures that the arguments are passed correctly. This function might
 * be a useful reference for a custom version callback that uses multiple
 * parameters.
 *
 * @param $library
 *   An associative array containing all information about the library.
 * @param $file
 *   The filename to parse for the version, relative to the library path. For
 *   example: 'docs/changelog.txt'.
 * @param pattern
 *   A string containing a regular expression (PCRE) to match the library
 *   version. For example: '/@version (\d+)\.(\d+)/'.
 * @param lines
 *   (optional) The maximum number of lines to search the pattern in. Defaults
 *   to 20.
 * @param cols
 *   (optional) The maximum number of characters per line to take into account.
 *   Defaults to 200. In case of minified or compressed files, this prevents
 *   reading the entire file into memory.
 *
 * @return
 *   A string containing the version of the library.
 *
 * @see libraries_get_version()
 */
function _libraries_test_get_version($library, $file, $pattern, $lines = 20, $cols = 200) {

  $file = DRUPAL_ROOT . '/' . $library['library path'] . '/' . $file;
  if (!file_exists($file)) {
    return;
  }
  $file = fopen($file, 'r');
  while ($lines && $line = fgets($file, $cols)) {
    if (preg_match($pattern, $line, $version)) {
      fclose($file);
      return $version[1];
    }
    $lines--;
  }
  fclose($file);
}

/**
 * Detects the variant of an example library.
 *
 * Returns exactly the value of $installed, either TRUE or FALSE. This function
 * cannot be collapsed with _libraries_test_return_version(), because of the
 * different arguments that are passed automatically.
 */
function _libraries_test_return_installed($library, $name, $installed) {
  return $installed;
}

/**
 * Sets the 'prepare callback' key.
 *
 * This function is used as a test callback for the 'prepare' callback group.
 *
 * @param $library
 *   An array of library information, which may be version- or variant-specific.
 *   Passed by reference.
 * @param $version
 *   The version the library information passed in $library belongs to, or NULL
 *   if the passed library information is not version-specific.
 * @param $variant
 *   The variant the library information passed in $library belongs to, or NULL
 *   if the passed library information is not variant-specific.
 *
 * @see _libraries_test_callback()
 */
function _libraries_test_prepare_callback(&$library, $version, $variant) {
  _libraries_test_callback($library, $version, $variant, 'prepare');
}

/**
 * Sets the 'detect callback' key.
 *
 * This function is used as a test callback for the 'detect' callback group.
 *
 * @param $library
 *   An array of library information, which may be version- or variant-specific.
 *   Passed by reference.
 * @param $version
 *   The version the library information passed in $library belongs to, or NULL
 *   if the passed library information is not version-specific.
 * @param $variant
 *   The variant the library information passed in $library belongs to, or NULL
 *   if the passed library information is not variant-specific.
 *
 * @see _libraries_test_callback()
 */
function _libraries_test_detect_callback(&$library, $version, $variant) {
  _libraries_test_callback($library, $version, $variant, 'detect');
}

/**
 * Sets the 'load callback' key.
 *
 * This function is used as a test callback for the 'load' callback group.
 *
 * @param $library
 *   An array of library information, which may be version- or variant-specific.
 *   Passed by reference.
 * @param $version
 *   The version the library information passed in $library belongs to, or NULL
 *   if the passed library information is not version-specific.
 * @param $variant
 *   The variant the library information passed in $library belongs to, or NULL
 *   if the passed library information is not variant-specific.
 *
 * @see _libraries_test_callback()
 */
function _libraries_test_load_callback(&$library, $version, $variant) {
  _libraries_test_callback($library, $version, $variant, 'load');
}

/**
 * Sets the '[group] callback' key, where [group] is prepare, detect, or load.
 *
 * This function is used as a test callback for the all callback groups.
 *
 * It sets the '[group] callback' (see above) key to 'applied ([part])' where
 * [part] is either 'top-level', 'version x.y' (where x.y is the passed-in
 * version string), 'variant example' (where example is the passed-in variant
 * name), or 'version x.y, variant example' (see above), depending on the part
 * of the library the passed-in library information belongs to.
 *
 * @param $library
 *   An array of library information, which may be version- or variant-specific.
 *   Passed by reference.
 * @param $version
 *   The version the library information passed in $library belongs to, or NULL
 *   if the passed library information is not version-specific.
 * @param $variant
 *   The variant the library information passed in $library belongs to, or NULL
 *   if the passed library information is not variant-specific.
 */
function _libraries_test_callback(&$library, $version, $variant, $group) {
  $string = 'applied';
  if (isset($version) && isset($variant)) {
    $string .= " (version $version, variant $variant)";
  }
  elseif (isset($version)) {
    $string .= " (version $version)";
  }
  elseif (isset($variant)) {
    $string .= " (variant $variant)";
  }
  else {
    $string .= ' (top-level)';
  }
  $library["$group callback"] = $string;
}

/**
 * Implements hook_menu().
 */
function libraries_test_menu() {
  $items['libraries_test/files'] = array(
    'title' => 'Test files',
    'page callback' => '_libraries_test_load',
    'page arguments' => array('example_files'),
    'access callback' => TRUE,
  );
  $items['libraries_test/integration_files'] = array(
    'title' => 'Test integration files',
    'page callback' => '_libraries_test_load',
    'page arguments' => array('example_integration_files'),
    'access callback' => TRUE,
  );
  $items['libraries_test/versions'] = array(
    'title' => 'Test version loading',
    'page callback' => '_libraries_test_load',
    'page arguments' => array('example_versions'),
    'access callback' => TRUE,
  );
  $items['libraries_test/variant'] = array(
    'title' => 'Test variant loading',
    'page callback' => '_libraries_test_load',
    'page arguments' => array('example_variant', 'example_variant'),
    'access callback' => TRUE,
  );
  $items['libraries_test/versions_and_variants'] = array(
    'title' => 'Test concurrent version and variant loading',
    'page callback' => '_libraries_test_load',
    'page arguments' => array('example_versions_and_variants', 'example_variant_2'),
    'access callback' => TRUE,
  );
  return $items;
}

/**
 * Loads a specified library (variant) for testing.
 *
 * JavaScript and CSS files can be checked directly by SimpleTest, so we only
 * need to manually check for PHP files. We provide information about the loaded
 * JavaScript and CSS files for easier debugging. See example/README.txt for
 * more information.
 */
function _libraries_test_load($library, $variant = NULL) {
  libraries_load($library, $variant);
  // JavaScript and CSS files can be checked directly by SimpleTest, so we only
  // need to manually check for PHP files.
  $output = '';

  // For easer debugging of JS loading, a text is shown that the JavaScript will
  // replace.
  $output .= '<h2>JavaScript</h2>';
  $output .= '<div class="libraries-test-javascript">';
  $output .= 'If this text shows up, no JavaScript test file was loaded.';
  $output .= '</div>';

  // For easier debugging of CSS loading, the loaded CSS files will color the
  // following text.
  $output .= '<h2>CSS</h2>';
  $output .= '<div class="libraries-test-css">';
  $output .= 'If one of the CSS test files has been loaded, this text will be colored:';
  $output .= '<ul>';
  // Do not reference the actual CSS files (i.e. including '.css'), because that
  // breaks testing.
  $output .= '<li>example_1: red</li>';
  $output .= '<li>example_2: green</li>';
  $output .= '<li>example_3: orange</li>';
  $output .= '<li>example_4: blue</li>';
  $output .= '<li>libraries_test: purple</li>';
  $output .= '</ul>';
  $output .= '</div>';

  $output .= '<h2>PHP</h2>';
  $output .= '<div class="libraries-test-php">';
  $output .= 'The following is a list of all loaded test PHP files:';
  $output .= '<ul>';
  $files = get_included_files();
  foreach ($files as $file) {
    if (strpos($file, 'libraries/test') && !strpos($file, 'libraries_test.module')) {
      $output .= '<li>' . strstr($file, 'libraries/test') . '</li>';
    }
  }
  $output .= '</ul>';
  $output .= '</div>';

  return $output;
}