class DevelMailLogTest

class DevelMailLogTest extends KernelTestBase {
    
    /**
     * Modules to enable.
     *
     * @var string[]
     */
    protected static $modules = [
        'devel',
        'devel_test',
        'system',
    ];
    
    /**
     * The mail manager.
     *
     * @var \Drupal\Core\Mail\MailManagerInterface
     */
    protected $mailManager;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->installConfig([
            'system',
            'devel',
        ]);
        // Configure system.site mail settings.
        $this->config('system.site')
            ->set('mail', 'devel-test@example.com')
            ->save();
        $this->mailManager = $this->container
            ->get('plugin.manager.mail');
    }
    
    /**
     * Tests devel_mail_log plugin as default mail backend.
     */
    public function testDevelMailLogDefaultBackend() : void {
        // Configure devel_mail_log as default mail backends.
        $this->setDevelMailLogAsDefaultBackend();
        // Ensures that devel_mail_log is the default mail plugin .
        $mail_backend = $this->mailManager
            ->getInstance([
            'module' => 'default',
            'key' => 'default',
        ]);
        $this->assertInstanceOf(DevelMailLog::class, $mail_backend);
        $mail_backend = $this->mailManager
            ->getInstance([
            'module' => 'somemodule',
            'key' => 'default',
        ]);
        $this->assertInstanceOf(DevelMailLog::class, $mail_backend);
    }
    
    /**
     * Tests devel_mail_log plugin with multiple mail backend.
     */
    public function testDevelMailLogMultipleBackend() : void {
        // Configure test_mail_collector as default mail backend.
        $this->config('system.mail')
            ->set('interface.default', 'test_mail_collector')
            ->save();
        // Configure devel_mail_log as a module-specific mail backend.
        $this->config('system.mail')
            ->set('interface.somemodule', 'devel_mail_log')
            ->save();
        // Ensures that devel_mail_log is not the default mail plugin.
        $mail_backend = $this->mailManager
            ->getInstance([
            'module' => 'default',
            'key' => 'default',
        ]);
        $this->assertInstanceOf(TestMailCollector::class, $mail_backend);
        // Ensures that devel_mail_log is used as mail backend only for the
        // specified module.
        $mail_backend = $this->mailManager
            ->getInstance([
            'module' => 'somemodule',
            'key' => 'default',
        ]);
        $this->assertInstanceOf(DevelMailLog::class, $mail_backend);
    }
    
    /**
     * Tests devel_mail_log default settings.
     */
    public function testDevelMailDefaultSettings() : void {
        $config = \Drupal::config('devel.settings');
        $this->assertEquals('temporary://devel-mails', $config->get('debug_mail_directory'));
        $this->assertEquals('%to-%subject-%datetime.mail.txt', $config->get('debug_mail_file_format'));
    }
    
    /**
     * Tests devel mail log output.
     */
    public function testDevelMailLogOutput() : void {
        $config = \Drupal::config('devel.settings');
        
        /** @var \Drupal\Core\Language\LanguageManagerInterface $language_manager */
        $language_manager = $this->container
            ->get('language_manager');
        // Parameters used for send the email.
        $mail = [
            'module' => 'devel_test',
            'key' => 'devel_mail_log',
            'to' => 'drupal@example.com',
            'reply' => 'replyto@example.com',
            'lang' => $language_manager->getCurrentLanguage()
                ->getId(),
        ];
        // Parameters used for compose the email in devel_test module.
        // @see devel_test_mail()
        $params = [
            'subject' => 'Devel mail log subject',
            'body' => 'Devel mail log body',
            'headers' => [
                'from' => 'postmaster@example.com',
                'additional' => [
                    'X-stupid' => 'dumb',
                ],
            ],
        ];
        // Configure devel_mail_log as default mail backends.
        $this->setDevelMailLogAsDefaultBackend();
        // Changes the default filename pattern removing the dynamic date
        // placeholder for a more predictable filename output.
        $random = $this->randomMachineName();
        $filename_pattern = '%to-%subject-' . $random . '.mail.txt';
        $this->config('devel.settings')
            ->set('debug_mail_file_format', $filename_pattern)
            ->save();
        $expected_filename = 'drupal@example.com-Devel_mail_log_subject-' . $random . '.mail.txt';
        $expected_output = <<<EOF
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed; delsp=yes
Content-Transfer-Encoding: 8Bit
X-Mailer: Drupal
Return-Path: devel-test@example.com
Sender: devel-test@example.com
From: postmaster@example.com
Reply-to: replyto@example.com
X-stupid: dumb
To: drupal@example.com
Subject: Devel mail log subject

Devel mail log body

EOF;
        // Ensures that the mail is captured by devel_mail_log and the placeholders
        // in the filename are properly resolved.
        $default_output_directory = $config->get('debug_mail_directory');
        $expected_file_path = $default_output_directory . '/' . $expected_filename;
        $this->mailManager
            ->mail($mail['module'], $mail['key'], $mail['to'], $mail['lang'], $params, $mail['reply']);
        $this->assertFileExists($expected_file_path);
        $this->assertStringEqualsFile($expected_file_path, $expected_output);
        // Ensures that even changing the default output directory devel_mail_log
        // works as expected.
        $changed_output_directory = 'temporary://my-folder';
        $expected_file_path = $changed_output_directory . '/' . $expected_filename;
        $this->config('devel.settings')
            ->set('debug_mail_directory', $changed_output_directory)
            ->save();
        $result = $this->mailManager
            ->mail($mail['module'], $mail['key'], $mail['to'], $mail['lang'], $params, $mail['reply']);
        $this->assertTrue($result['result']);
        $this->assertFileExists($expected_file_path);
        $this->assertStringEqualsFile($expected_file_path, $expected_output);
        // Ensures that if the default output directory is a public directory it
        // will be protected by adding an .htaccess.
        $public_output_directory = 'public://my-folder';
        $expected_file_path = $public_output_directory . '/' . $expected_filename;
        $this->config('devel.settings')
            ->set('debug_mail_directory', $public_output_directory)
            ->save();
        $this->mailManager
            ->mail($mail['module'], $mail['key'], $mail['to'], $mail['lang'], $params, $mail['reply']);
        $this->assertFileExists($expected_file_path);
        $this->assertStringEqualsFile($expected_file_path, $expected_output);
        $this->assertFileExists($public_output_directory . '/.htaccess');
    }
    
    /**
     * Configure devel_mail_log as default mail backend.
     */
    private function setDevelMailLogAsDefaultBackend() : void {
        // @todo can this be avoided?
        // KernelTestBase enforce the usage of 'test_mail_collector' plugin for
        // collect the mails. Since we need to test devel mail plugin we manually
        // configure the mail implementation to use 'devel_mail_log'.
        $GLOBALS['config']['system.mail']['interface']['default'] = 'devel_mail_log';
        // Configure devel_mail_log as default mail backend.
        $this->config('system.mail')
            ->set('interface.default', 'devel_mail_log')
            ->save();
    }

}