<?php

namespace Drupal\Tests\Core\Site;

use Drupal\Core\Site\Settings;
use Drupal\Tests\UnitTestCase;

/**
 * @coversDefaultClass \Drupal\Core\Site\Settings
 * @group Site
 */
class SettingsTest extends UnitTestCase {

  /**
   * Simple settings array to test against.
   *
   * @var array
   */
  protected $config = [];

  /**
   * The class under test.
   *
   * @var \Drupal\Core\Site\Settings
   */
  protected $settings;

  /**
   * @covers ::__construct
   */
  protected function setUp() {
    $this->config = [
      'one' => '1',
      'two' => '2',
      'hash_salt' => $this->randomMachineName(),
    ];
    $this->settings = new Settings($this->config);
  }

  /**
   * @covers ::get
   */
  public function testGet() {
    // Test stored settings.
    $this->assertEquals($this->config['one'], Settings::get('one'), 'The correct setting was not returned.');
    $this->assertEquals($this->config['two'], Settings::get('two'), 'The correct setting was not returned.');

    // Test setting that isn't stored with default.
    $this->assertEquals('3', Settings::get('three', '3'), 'Default value for a setting not properly returned.');
    $this->assertNull(Settings::get('four'), 'Non-null value returned for a setting that should not exist.');
  }

  /**
   * @covers ::getAll
   */
  public function testGetAll() {
    $this->assertEquals($this->config, Settings::getAll());
  }

  /**
   * @covers ::getInstance
   */
  public function testGetInstance() {
    $singleton = $this->settings->getInstance();
    $this->assertEquals($singleton, $this->settings);
  }

  /**
   * Tests Settings::getHashSalt();
   *
   * @covers ::getHashSalt
   */
  public function testGetHashSalt() {
    $this->assertSame($this->config['hash_salt'], $this->settings->getHashSalt());
  }

  /**
   * Tests Settings::getHashSalt() with no hash salt value.
   *
   * @covers ::getHashSalt
   *
   * @dataProvider providerTestGetHashSaltEmpty
   */
  public function testGetHashSaltEmpty(array $config) {
    // Re-create settings with no 'hash_salt' key.
    $settings = new Settings($config);
    $this->setExpectedException(\RuntimeException::class);
    $settings->getHashSalt();
  }

  /**
   * Data provider for testGetHashSaltEmpty.
   *
   * @return array
   */
  public function providerTestGetHashSaltEmpty() {
    return [
      [[]],
      [['hash_salt' => '']],
      [['hash_salt' => NULL]],
    ];
  }

  /**
   * Ensures settings cannot be serialized.
   *
   * @covers ::__sleep
   */
  public function testSerialize() {
    $this->setExpectedException(\LogicException::class);
    serialize(new Settings([]));
  }

  /**
   * Tests Settings::getApcuPrefix().
   *
   * @covers ::getApcuPrefix
   */
  public function testGetApcuPrefix() {
    $settings = new Settings(['hash_salt' => 123, 'apcu_ensure_unique_prefix' => TRUE]);
    $this->assertNotEquals($settings::getApcuPrefix('cache_test', '/test/a'), $settings::getApcuPrefix('cache_test', '/test/b'));

    $settings = new Settings(['hash_salt' => 123, 'apcu_ensure_unique_prefix' => FALSE]);
    $this->assertNotEquals($settings::getApcuPrefix('cache_test', '/test/a'), $settings::getApcuPrefix('cache_test', '/test/b'));
  }

  /**
   * Tests that an exception is thrown when settings are not initialized yet.
   *
   * @covers ::getInstance
   */
  public function testGetInstanceReflection() {
    $settings = new Settings([]);

    $class = new \ReflectionClass(Settings::class);
    $instace_property = $class->getProperty("instance");
    $instace_property->setAccessible(TRUE);
    $instace_property->setValue(NULL);

    $this->setExpectedException(\BadMethodCallException::class);
    $settings->getInstance();
  }

}