class ModuleHandlerTest

class ModuleHandlerTest extends KernelTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'system',
    ];
    
    /**
     * The basic functionality of retrieving enabled modules.
     */
    public function testModuleList() {
        $module_list = [
            'system',
        ];
        $database_module = \Drupal::database()->getProvider();
        if ($database_module !== 'core') {
            $module_list[] = $database_module;
        }
        sort($module_list);
        $this->assertModuleList($module_list, 'Initial');
        // Try to install a new module.
        $this->moduleInstaller()
            ->install([
            'ban',
        ]);
        $module_list[] = 'ban';
        sort($module_list);
        $this->assertModuleList($module_list, 'After adding a module');
        // Try to mess with the module weights.
        module_set_weight('ban', 20);
        // Move ban to the end of the array.
        unset($module_list[array_search('ban', $module_list)]);
        $module_list[] = 'ban';
        $this->assertModuleList($module_list, 'After changing weights');
        // Test the fixed list feature.
        $fixed_list = [
            'system' => 'core/modules/system/system.module',
            'menu' => 'core/modules/menu/menu.module',
        ];
        $this->moduleHandler()
            ->setModuleList($fixed_list);
        $new_module_list = array_combine(array_keys($fixed_list), array_keys($fixed_list));
        $this->assertModuleList($new_module_list, 'When using a fixed list');
    }
    
    /**
     * Assert that the extension handler returns the expected values.
     *
     * @param array $expected_values
     *   The expected values, sorted by weight and module name.
     * @param string $condition
     *   The condition being tested, such as 'After adding a module'.
     *
     * @internal
     */
    protected function assertModuleList(array $expected_values, string $condition) : void {
        $expected_values = array_values(array_unique($expected_values));
        $enabled_modules = array_keys($this->container
            ->get('module_handler')
            ->getModuleList());
        $this->assertEquals($expected_values, $enabled_modules, "{$condition}: extension handler returns correct results");
    }
    
    /**
     * Tests dependency resolution.
     *
     * Intentionally using fake dependencies added via hook_system_info_alter()
     * for modules that normally do not have any dependencies.
     *
     * To simplify things further, all of the manipulated modules are either
     * purely UI-facing or live at the "bottom" of all dependency chains.
     *
     * @see module_test_system_info_alter()
     * @see https://www.drupal.org/files/issues/dep.gv__0.png
     */
    public function testDependencyResolution() {
        $this->enableModules([
            'module_test',
        ]);
        $this->assertTrue($this->moduleHandler()
            ->moduleExists('module_test'), 'Test module is enabled.');
        // Ensure that modules are not enabled.
        $this->assertFalse($this->moduleHandler()
            ->moduleExists('dblog'), 'dblog module is disabled.');
        $this->assertFalse($this->moduleHandler()
            ->moduleExists('config'), 'Config module is disabled.');
        $this->assertFalse($this->moduleHandler()
            ->moduleExists('help'), 'Help module is disabled.');
        // Create a missing fake dependency.
        // dblog will depend on Config, which depends on a non-existing module Foo.
        // Nothing should be installed.
        \Drupal::state()->set('module_test.dependency', 'missing dependency');
        try {
            $result = $this->moduleInstaller()
                ->install([
                'dblog',
            ]);
            $this->fail('ModuleInstaller::install() throws an exception if dependencies are missing.');
        } catch (MissingDependencyException $e) {
            // Expected exception; just continue testing.
        }
        $this->assertFalse($this->moduleHandler()
            ->moduleExists('dblog'), 'ModuleInstaller::install() aborts if dependencies are missing.');
        // Fix the missing dependency.
        // dblog module depends on Config. Config depends on Help module.
        \Drupal::state()->set('module_test.dependency', 'dependency');
        $result = $this->moduleInstaller()
            ->install([
            'dblog',
        ]);
        $this->assertTrue($result, 'ModuleInstaller::install() returns the correct value.');
        // Verify that the fake dependency chain was installed.
        $this->assertTrue($this->moduleHandler()
            ->moduleExists('config'));
        $this->assertTrue($this->moduleHandler()
            ->moduleExists('help'));
        // Verify that the original module was installed.
        $this->assertTrue($this->moduleHandler()
            ->moduleExists('dblog'), 'Module installation with dependencies succeeded.');
        // Verify that the modules were enabled in the correct order.
        $module_order = \Drupal::state()->get('module_test.install_order', []);
        $this->assertEquals([
            'help',
            'config',
            'dblog',
        ], $module_order);
        // Uninstall all three modules explicitly, but in the incorrect order,
        // and make sure that ModuleInstaller::uninstall() uninstalled them in the
        // correct sequence.
        $result = $this->moduleInstaller()
            ->uninstall([
            'config',
            'help',
            'dblog',
        ]);
        $this->assertTrue($result, 'ModuleInstaller::uninstall() returned TRUE.');
        
        /** @var \Drupal\Core\Update\UpdateHookRegistry $update_registry */
        $update_registry = \Drupal::service('update.update_hook_registry');
        foreach ([
            'dblog',
            'config',
            'help',
        ] as $module) {
            $this->assertEquals($update_registry::SCHEMA_UNINSTALLED, $update_registry->getInstalledVersion($module), "{$module} module was uninstalled.");
        }
        $uninstalled_modules = \Drupal::state()->get('module_test.uninstall_order', []);
        $this->assertEquals([
            'dblog',
            'config',
            'help',
        ], $uninstalled_modules, 'Modules were uninstalled in the correct order.');
        // Enable dblog module again, which should enable both the Config module and
        // Help module. But, this time do it with Config module declaring a
        // dependency on a specific version of Help module in its info file. Make
        // sure that Drupal\Core\Extension\ModuleInstaller::install() still works.
        \Drupal::state()->set('module_test.dependency', 'version dependency');
        $result = $this->moduleInstaller()
            ->install([
            'dblog',
        ]);
        $this->assertTrue($result, 'ModuleInstaller::install() returns the correct value.');
        // Verify that the fake dependency chain was installed.
        $this->assertTrue($this->moduleHandler()
            ->moduleExists('config'));
        $this->assertTrue($this->moduleHandler()
            ->moduleExists('help'));
        // Verify that the original module was installed.
        $this->assertTrue($this->moduleHandler()
            ->moduleExists('dblog'), 'Module installation with version dependencies succeeded.');
        // Finally, verify that the modules were enabled in the correct order.
        $enable_order = \Drupal::state()->get('module_test.install_order', []);
        $this->assertSame([
            'help',
            'config',
            'dblog',
        ], $enable_order);
    }
    
    /**
     * Tests uninstalling a module installed by a profile.
     */
    public function testUninstallProfileDependency() {
        $profile = 'testing_install_profile_dependencies';
        $dependency = 'dblog';
        $non_dependency = 'ban';
        $this->setInstallProfile($profile);
        // Prime the \Drupal\Core\Extension\ExtensionList::getPathname() static
        // cache with the location of the testing_install_profile_dependencies
        // profile as it is not the currently active profile and we don't yet have
        // any cached way to retrieve its location.
        // @todo Remove as part of https://www.drupal.org/node/2186491
        $profile_list = \Drupal::service('extension.list.profile');
        assert($profile_list instanceof ProfileExtensionList);
        $profile_list->setPathname($profile, 'core/profiles/' . $profile . '/' . $profile . '.info.yml');
        $this->enableModules([
            'module_test',
            $profile,
        ]);
        $data = \Drupal::service('extension.list.module')->reset()
            ->getList();
        $this->assertArrayHasKey($dependency, $data[$profile]->requires);
        $this->assertArrayNotHasKey($non_dependency, $data[$profile]->requires);
        $this->moduleInstaller()
            ->install([
            $dependency,
            $non_dependency,
        ]);
        $this->assertTrue($this->moduleHandler()
            ->moduleExists($dependency));
        // Uninstall the profile module that is not a dependent.
        
        /** @var \Drupal\Core\Update\UpdateHookRegistry $update_registry */
        $update_registry = \Drupal::service('update.update_hook_registry');
        $result = $this->moduleInstaller()
            ->uninstall([
            $non_dependency,
        ]);
        $this->assertTrue($result, 'ModuleInstaller::uninstall() returns TRUE.');
        $this->assertFalse($this->moduleHandler()
            ->moduleExists($non_dependency));
        $this->assertEquals($update_registry::SCHEMA_UNINSTALLED, $update_registry->getInstalledVersion($non_dependency), "{$non_dependency} module was uninstalled.");
        // Verify that the installation profile itself was not uninstalled.
        $uninstalled_modules = \Drupal::state()->get('module_test.uninstall_order', []);
        $this->assertContains($non_dependency, $uninstalled_modules, "{$non_dependency} module is in the list of uninstalled modules.");
        $this->assertNotContains($profile, $uninstalled_modules, 'The installation profile is not in the list of uninstalled modules.');
        // Try uninstalling the required module.
        $this->expectException(ModuleUninstallValidatorException::class);
        $this->expectExceptionMessage('The following reasons prevent the modules from being uninstalled: The Testing install profile dependencies module is required');
        $this->moduleInstaller()
            ->uninstall([
            $dependency,
        ]);
    }
    
    /**
     * Tests that a profile can supply only real dependencies.
     */
    public function testProfileAllDependencies() {
        $profile = 'testing_install_profile_all_dependencies';
        $dependencies = [
            'dblog',
            'ban',
        ];
        $this->setInstallProfile($profile);
        // Prime the \Drupal\Core\Extension\ExtensionList::getPathname() static
        // cache with the location of the testing_install_profile_dependencies
        // profile as it is not the currently active profile and we don't yet have
        // any cached way to retrieve its location.
        // @todo Remove as part of https://www.drupal.org/node/2186491
        $profile_list = \Drupal::service('extension.list.profile');
        assert($profile_list instanceof ProfileExtensionList);
        $profile_list->setPathname($profile, 'core/profiles/' . $profile . '/' . $profile . '.info.yml');
        $this->enableModules([
            'module_test',
            $profile,
        ]);
        $data = \Drupal::service('extension.list.module')->reset()
            ->getList();
        foreach ($dependencies as $dependency) {
            $this->assertArrayHasKey($dependency, $data[$profile]->requires);
        }
        $this->moduleInstaller()
            ->install($dependencies);
        foreach ($dependencies as $dependency) {
            $this->assertTrue($this->moduleHandler()
                ->moduleExists($dependency));
        }
        // Try uninstalling the dependencies.
        $this->expectException(ModuleUninstallValidatorException::class);
        $this->expectExceptionMessage('The following reasons prevent the modules from being uninstalled: The Testing install profile all dependencies module is required');
        $this->moduleInstaller()
            ->uninstall($dependencies);
    }
    
    /**
     * Tests uninstalling a module that has content.
     */
    public function testUninstallContentDependency() {
        $this->enableModules([
            'module_test',
            'entity_test',
            'text',
            'user',
            'help',
        ]);
        $this->assertTrue($this->moduleHandler()
            ->moduleExists('entity_test'), 'Test module is enabled.');
        $this->assertTrue($this->moduleHandler()
            ->moduleExists('module_test'), 'Test module is enabled.');
        $this->installSchema('user', 'users_data');
        $entity_types = \Drupal::entityTypeManager()->getDefinitions();
        foreach ($entity_types as $entity_type) {
            if ($entity_type instanceof ContentEntityTypeInterface && 'entity_test' == $entity_type->getProvider()) {
                $this->installEntitySchema($entity_type->id());
            }
        }
        // Create a fake dependency.
        // entity_test will depend on help. This way help can not be uninstalled
        // when there is test content preventing entity_test from being uninstalled.
        \Drupal::state()->set('module_test.dependency', 'dependency');
        // Create an entity so that the modules can not be disabled.
        $entity = EntityTest::create([
            'name' => $this->randomString(),
        ]);
        $entity->save();
        // Uninstalling entity_test is not possible when there is content.
        try {
            $message = 'ModuleInstaller::uninstall() throws ModuleUninstallValidatorException upon uninstalling a module which does not pass validation.';
            $this->moduleInstaller()
                ->uninstall([
                'entity_test',
            ]);
            $this->fail($message);
        } catch (ModuleUninstallValidatorException $e) {
            // Expected exception; just continue testing.
        }
        // Uninstalling help needs entity_test to be un-installable.
        try {
            $message = 'ModuleInstaller::uninstall() throws ModuleUninstallValidatorException upon uninstalling a module which does not pass validation.';
            $this->moduleInstaller()
                ->uninstall([
                'help',
            ]);
            $this->fail($message);
        } catch (ModuleUninstallValidatorException $e) {
            // Expected exception; just continue testing.
        }
        // Deleting the entity.
        $entity->delete();
        
        /** @var \Drupal\Core\Update\UpdateHookRegistry $update_registry */
        $update_registry = \Drupal::service('update.update_hook_registry');
        $result = $this->moduleInstaller()
            ->uninstall([
            'help',
        ]);
        $this->assertTrue($result, 'ModuleInstaller::uninstall() returns TRUE.');
        $this->assertEquals($update_registry::SCHEMA_UNINSTALLED, $update_registry->getInstalledVersion('entity_test'), "entity_test module was uninstalled.");
    }
    
    /**
     * Tests whether the correct module metadata is returned.
     */
    public function testModuleMetaData() {
        // Generate the list of available modules.
        $modules = $this->container
            ->get('extension.list.module')
            ->getList();
        // Check that the mtime field exists for the system module.
        $this->assertNotEmpty($modules['system']->info['mtime'], 'The system.info.yml file modification time field is present.');
        // Use 0 if mtime isn't present, to avoid an array index notice.
        $test_mtime = !empty($modules['system']->info['mtime']) ? $modules['system']->info['mtime'] : 0;
        // Ensure the mtime field contains a number that is greater than zero.
        $this->assertIsNumeric($test_mtime);
        $this->assertGreaterThan(0, $test_mtime);
    }
    
    /**
     * Tests whether module-provided stream wrappers are registered properly.
     */
    public function testModuleStreamWrappers() {
        // file_test.module provides (among others) a 'dummy' stream wrapper.
        // Verify that it is not registered yet to prevent false positives.
        $stream_wrappers = \Drupal::service('stream_wrapper_manager')->getWrappers();
        $this->assertFalse(isset($stream_wrappers['dummy']));
        $this->moduleInstaller()
            ->install([
            'file_test',
        ]);
        // Verify that the stream wrapper is available even without calling
        // \Drupal::service('stream_wrapper_manager')->getWrappers() again.
        // If the stream wrapper is not available file_exists() will raise a notice.
        file_exists('dummy://');
        $stream_wrappers = \Drupal::service('stream_wrapper_manager')->getWrappers();
        $this->assertTrue(isset($stream_wrappers['dummy']));
        $this->assertTrue(isset($stream_wrappers['dummy1']));
        $this->assertTrue(isset($stream_wrappers['dummy2']));
    }
    
    /**
     * Tests whether the correct theme metadata is returned.
     */
    public function testThemeMetaData() {
        // Generate the list of available themes.
        $themes = \Drupal::service('extension.list.theme')->reset()
            ->getList();
        // Check that the mtime field exists for the olivero theme.
        $this->assertNotEmpty($themes['olivero']->info['mtime'], 'The olivero.info.yml file modification time field is present.');
        // Use 0 if mtime isn't present, to avoid an array index notice.
        $test_mtime = !empty($themes['olivero']->info['mtime']) ? $themes['olivero']->info['mtime'] : 0;
        // Ensure the mtime field contains a number that is greater than zero.
        $this->assertIsNumeric($test_mtime);
        $this->assertGreaterThan(0, $test_mtime);
    }
    
    /**
     * Returns the ModuleHandler.
     *
     * @return \Drupal\Core\Extension\ModuleHandlerInterface
     */
    protected function moduleHandler() {
        return $this->container
            ->get('module_handler');
    }
    
    /**
     * Returns the ModuleInstaller.
     *
     * @return \Drupal\Core\Extension\ModuleInstallerInterface
     */
    protected function moduleInstaller() {
        return $this->container
            ->get('module_installer');
    }

}