<?php

class CacheTestCase extends DrupalWebTestCase {
  protected $default_bin = 'cache';
  protected $default_cid = 'test_temporary';
  protected $default_value = 'CacheTest';

  /**
   * Check whether or not a cache entry exists.
   *
   * @param $cid
   *   The cache id.
   * @param $var
   *   The variable the cache should contain.
   * @param $bin
   *   The bin the cache item was stored in.
   * @return
   *   TRUE on pass, FALSE on fail.
   */
  protected function checkCacheExists($cid, $var, $bin = NULL) {
    if ($bin == NULL) {
      $bin = $this->default_bin;
    }

    $cache = cache_get($cid, $bin);

    return isset($cache->data) && $cache->data == $var;
  }

  /**
   * Assert or a cache entry exists.
   *
   * @param $message
   *   Message to display.
   * @param $var
   *   The variable the cache should contain.
   * @param $cid
   *   The cache id.
   * @param $bin
   *   The bin the cache item was stored in.
   */
  protected function assertCacheExists($message, $var = NULL, $cid = NULL, $bin = NULL) {
    if ($bin == NULL) {
      $bin = $this->default_bin;
    }
    if ($cid == NULL) {
      $cid = $this->default_cid;
    }
    if ($var == NULL) {
      $var = $this->default_value;
    }

    $this->assertTrue($this->checkCacheExists($cid, $var, $bin), $message);
  }

  /**
   * Assert or a cache entry has been removed.
   *
   * @param $message
   *   Message to display.
   * @param $cid
   *   The cache id.
   * @param $bin
   *   The bin the cache item was stored in.
   */
  function assertCacheRemoved($message, $cid = NULL, $bin = NULL) {
    if ($bin == NULL) {
      $bin = $this->default_bin;
    }
    if ($cid == NULL) {
      $cid = $this->default_cid;
    }

    $cache = cache_get($cid, $bin);
    $this->assertFalse($cache, $message);
  }

  /**
   * Perform the general wipe.
   * @param $bin
   *   The bin to perform the wipe on.
   */
  protected function generalWipe($bin = NULL) {
    if ($bin == NULL) {
      $bin = $this->default_bin;
    }

    cache_clear_all(NULL, $bin);
  }

  /**
   * Setup the lifetime settings for caching.
   *
   * @param $time
   *   The time in seconds the cache should minimal live.
   */
  protected function setupLifetime($time) {
    variable_set('cache_lifetime', $time);
    variable_set('cache_flush', 0);
  }
}

class CacheSavingCase extends CacheTestCase {
  public static function getInfo() {
    return array(
      'name' => 'Cache saving test',
      'description' => 'Check our variables are saved and restored the right way.',
      'group' => 'Cache'
    );
  }

  /**
   * Test the saving and restoring of a string.
   */
  function testString() {
    $this->checkVariable($this->randomName(100));
  }

  /**
   * Test the saving and restoring of an integer.
   */
  function testInteger() {
    $this->checkVariable(100);
  }

  /**
   * Test the saving and restoring of a double.
   */
  function testDouble() {
    $this->checkVariable(1.29);
  }

  /**
   * Test the saving and restoring of an array.
   */
  function testArray() {
    $this->checkVariable(array('drupal1', 'drupal2' => 'drupal3', 'drupal4' => array('drupal5', 'drupal6')));
  }

  /**
   * Test the saving and restoring of an object.
   */
  function testObject() {
    $test_object = new stdClass();
    $test_object->test1 = $this->randomName(100);
    $test_object->test2 = 100;
    $test_object->test3 = array('drupal1', 'drupal2' => 'drupal3', 'drupal4' => array('drupal5', 'drupal6'));

    cache_set('test_object', $test_object, 'cache');
    $cache = cache_get('test_object', 'cache');
    $this->assertTrue(isset($cache->data) && $cache->data == $test_object, 'Object is saved and restored properly.');
  }

  /**
   * Check or a variable is stored and restored properly.
   */
  function checkVariable($var) {
    cache_set('test_var', $var, 'cache');
    $cache = cache_get('test_var', 'cache');
    $this->assertTrue(isset($cache->data) && $cache->data === $var, format_string('@type is saved and restored properly.', array('@type' => ucfirst(gettype($var)))));
  }

  /**
   * Test no empty cids are written in cache table.
   */
  function testNoEmptyCids() {
    $this->drupalGet('user/register');
    $this->assertFalse(cache_get(''), 'No cache entry is written with an empty cid.');
  }
}

/**
 * Test cache_get_multiple().
 */
class CacheGetMultipleUnitTest extends CacheTestCase {

  public static function getInfo() {
    return array(
      'name' => 'Fetching multiple cache items',
      'description' => 'Confirm that multiple records are fetched correctly.',
      'group' => 'Cache',
    );
  }

  function setUp() {
    $this->default_bin = 'cache_page';
    parent::setUp();
  }

  /**
   * Test cache_get_multiple().
   */
  function testCacheMultiple() {
    $item1 = $this->randomName(10);
    $item2 = $this->randomName(10);
    cache_set('item1', $item1, $this->default_bin);
    cache_set('item2', $item2, $this->default_bin);
    $this->assertTrue($this->checkCacheExists('item1', $item1), 'Item 1 is cached.');
    $this->assertTrue($this->checkCacheExists('item2', $item2), 'Item 2 is cached.');

    // Fetch both records from the database with cache_get_multiple().
    $item_ids = array('item1', 'item2');
    $items = cache_get_multiple($item_ids, $this->default_bin);
    $this->assertEqual($items['item1']->data, $item1, 'Item was returned from cache successfully.');
    $this->assertEqual($items['item2']->data, $item2, 'Item was returned from cache successfully.');

    // Remove one item from the cache.
    cache_clear_all('item2', $this->default_bin);

    // Confirm that only one item is returned by cache_get_multiple().
    $item_ids = array('item1', 'item2');
    $items = cache_get_multiple($item_ids, $this->default_bin);
    $this->assertEqual($items['item1']->data, $item1, 'Item was returned from cache successfully.');
    $this->assertFalse(isset($items['item2']), 'Item was not returned from the cache.');
    $this->assertTrue(count($items) == 1, 'Only valid cache entries returned.');
  }
}

/**
 * Test cache clearing methods.
 */
class CacheClearCase extends CacheTestCase {
  public static function getInfo() {
    return array(
      'name' => 'Cache clear test',
      'description' => 'Check our clearing is done the proper way.',
      'group' => 'Cache'
    );
  }

  function setUp() {
    $this->default_bin = 'cache_page';
    $this->default_value = $this->randomName(10);

    parent::setUp();
  }

  /**
   * Test clearing using a cid.
   */
  function testClearCid() {
    cache_set('test_cid_clear', $this->default_value, $this->default_bin);

    $this->assertCacheExists(t('Cache was set for clearing cid.'), $this->default_value, 'test_cid_clear');
    cache_clear_all('test_cid_clear', $this->default_bin);

    $this->assertCacheRemoved(t('Cache was removed after clearing cid.'), 'test_cid_clear');

    cache_set('test_cid_clear1', $this->default_value, $this->default_bin);
    cache_set('test_cid_clear2', $this->default_value, $this->default_bin);
    $this->assertTrue($this->checkCacheExists('test_cid_clear1', $this->default_value)
                      && $this->checkCacheExists('test_cid_clear2', $this->default_value),
                      'Two caches were created for checking cid "*" with wildcard false.');
    cache_clear_all('*', $this->default_bin);
    $this->assertTrue($this->checkCacheExists('test_cid_clear1', $this->default_value)
                      && $this->checkCacheExists('test_cid_clear2', $this->default_value),
                      'Two caches still exists after clearing cid "*" with wildcard false.');
  }

  /**
   * Test clearing using wildcard.
   */
  function testClearWildcard() {
    cache_set('test_cid_clear1', $this->default_value, $this->default_bin);
    cache_set('test_cid_clear2', $this->default_value, $this->default_bin);
    $this->assertTrue($this->checkCacheExists('test_cid_clear1', $this->default_value)
                      && $this->checkCacheExists('test_cid_clear2', $this->default_value),
                      'Two caches were created for checking cid "*" with wildcard true.');
    cache_clear_all('*', $this->default_bin, TRUE);
    $this->assertFalse($this->checkCacheExists('test_cid_clear1', $this->default_value)
                      || $this->checkCacheExists('test_cid_clear2', $this->default_value),
                      'Two caches removed after clearing cid "*" with wildcard true.');

    cache_set('test_cid_clear1', $this->default_value, $this->default_bin);
    cache_set('test_cid_clear2', $this->default_value, $this->default_bin);
    $this->assertTrue($this->checkCacheExists('test_cid_clear1', $this->default_value)
                      && $this->checkCacheExists('test_cid_clear2', $this->default_value),
                      'Two caches were created for checking cid substring with wildcard true.');
    cache_clear_all('test_', $this->default_bin, TRUE);
    $this->assertFalse($this->checkCacheExists('test_cid_clear1', $this->default_value)
                      || $this->checkCacheExists('test_cid_clear2', $this->default_value),
                      'Two caches removed after clearing cid substring with wildcard true.');
  }

  /**
   * Test clearing using an array.
   */
  function testClearArray() {
    // Create three cache entries.
    cache_set('test_cid_clear1', $this->default_value, $this->default_bin);
    cache_set('test_cid_clear2', $this->default_value, $this->default_bin);
    cache_set('test_cid_clear3', $this->default_value, $this->default_bin);
    $this->assertTrue($this->checkCacheExists('test_cid_clear1', $this->default_value)
                      && $this->checkCacheExists('test_cid_clear2', $this->default_value)
                      && $this->checkCacheExists('test_cid_clear3', $this->default_value),
                      'Three cache entries were created.');

    // Clear two entries using an array.
    cache_clear_all(array('test_cid_clear1', 'test_cid_clear2'), $this->default_bin);
    $this->assertFalse($this->checkCacheExists('test_cid_clear1', $this->default_value)
                       || $this->checkCacheExists('test_cid_clear2', $this->default_value),
                       'Two cache entries removed after clearing with an array.');

    $this->assertTrue($this->checkCacheExists('test_cid_clear3', $this->default_value),
                      'Entry was not cleared from the cache');

    // Set the cache clear threshold to 2 to confirm that the full bin is cleared
    // when the threshold is exceeded.
    variable_set('cache_clear_threshold', 2);
    cache_set('test_cid_clear1', $this->default_value, $this->default_bin);
    cache_set('test_cid_clear2', $this->default_value, $this->default_bin);
    $this->assertTrue($this->checkCacheExists('test_cid_clear1', $this->default_value)
                      && $this->checkCacheExists('test_cid_clear2', $this->default_value),
                      'Two cache entries were created.');
    cache_clear_all(array('test_cid_clear1', 'test_cid_clear2', 'test_cid_clear3'), $this->default_bin);
    $this->assertFalse($this->checkCacheExists('test_cid_clear1', $this->default_value)
                       || $this->checkCacheExists('test_cid_clear2', $this->default_value)
                       || $this->checkCacheExists('test_cid_clear3', $this->default_value),
                       'All cache entries removed when the array exceeded the cache clear threshold.');
  }

  /**
   * Test drupal_flush_all_caches().
   */
  function testFlushAllCaches() {
    // Create cache entries for each flushed cache bin.
    $bins = array('cache', 'cache_filter', 'cache_page', 'cache_boostrap', 'cache_path');
    $bins = array_merge(module_invoke_all('flush_caches'), $bins);
    foreach ($bins as $id => $bin) {
      $id = 'test_cid_clear' . $id;
      cache_set($id, $this->default_value, $bin);
    }

    // Remove all caches then make sure that they are cleared.
    drupal_flush_all_caches();

    foreach ($bins as $id => $bin) {
      $id = 'test_cid_clear' . $id;
      $this->assertFalse($this->checkCacheExists($id, $this->default_value, $bin), format_string('All cache entries removed from @bin.', array('@bin' => $bin)));
    }
  }

  /**
   * Test DrupalDatabaseCache::isValidBin().
   */
  function testIsValidBin() {
    // Retrieve existing cache bins.
    $valid_bins = array('cache', 'cache_filter', 'cache_page', 'cache_boostrap', 'cache_path');
    $valid_bins = array_merge(module_invoke_all('flush_caches'), $valid_bins);
    foreach ($valid_bins as $id => $bin) {
      $cache = _cache_get_object($bin);
      if ($cache instanceof DrupalDatabaseCache) {
        $this->assertTrue($cache->isValidBin(), format_string('Cache bin @bin is valid.', array('@bin' => $bin)));
      }
    }

    // Check for non-cache tables and invalid bins.
    $invalid_bins = array('block', 'filter', 'missing_table', $this->randomName());
    foreach ($invalid_bins as $id => $bin) {
      $cache = _cache_get_object($bin);
      if ($cache instanceof DrupalDatabaseCache) {
        $this->assertFalse($cache->isValidBin(), format_string('Cache bin @bin is not valid.', array('@bin' => $bin)));
      }
    }
  }

  /**
   * Test minimum cache lifetime.
   */
  function testMinimumCacheLifetime() {
    // Set a minimum/maximum cache lifetime.
    $this->setupLifetime(300);
    // Login as a newly-created user.
    $account = $this->drupalCreateUser(array());
    $this->drupalLogin($account);

    // Set two cache objects in different bins.
    $data = $this->randomName(100);
    cache_set($data, $data, 'cache', CACHE_TEMPORARY);
    $cached = cache_get($data);
    $this->assertTrue(isset($cached->data) && $cached->data === $data, 'Cached item retrieved.');
    cache_set($data, $data, 'cache_page', CACHE_TEMPORARY);

    // Expire temporary items in the 'page' bin.
    cache_clear_all(NULL, 'cache_page');

    // Since the database cache uses REQUEST_TIME, set the $_SESSION variable
    // manually to force it to the current time.
    $_SESSION['cache_expiration']['cache_page'] = time();

    // Items in the default cache bin should not be expired.
    $cached = cache_get($data);
    $this->assertTrue(isset($cached->data) && $cached->data == $data, 'Cached item retrieved');

    // Despite the minimum cache lifetime, the item in the 'page' bin should
    // be invalidated for the current user.
    $cached = cache_get($data, 'cache_page');
    $this->assertFalse($cached, 'Cached item was invalidated');
  }
}

/**
 * Test cache_is_empty() function.
 */
class CacheIsEmptyCase extends CacheTestCase {
  public static function getInfo() {
    return array(
      'name' => 'Cache emptiness test',
      'description' => 'Check if a cache bin is empty after performing clear operations.',
      'group' => 'Cache'
    );
  }

  function setUp() {
    $this->default_bin = 'cache_page';
    $this->default_value = $this->randomName(10);

    parent::setUp();
  }

  /**
   * Test clearing using a cid.
   */
  function testIsEmpty() {
    // Clear the cache bin.
    cache_clear_all('*', $this->default_bin);
    $this->assertTrue(cache_is_empty($this->default_bin), 'The cache bin is empty');
    // Add some data to the cache bin.
    cache_set($this->default_cid, $this->default_value, $this->default_bin);
    $this->assertCacheExists(t('Cache was set.'), $this->default_value, $this->default_cid);
    $this->assertFalse(cache_is_empty($this->default_bin), 'The cache bin is not empty');
    // Remove the cached data.
    cache_clear_all($this->default_cid, $this->default_bin);
    $this->assertCacheRemoved(t('Cache was removed.'), $this->default_cid);
    $this->assertTrue(cache_is_empty($this->default_bin), 'The cache bin is empty');
  }
}
