Add DatabaseCredentials class and implement database picker question

config/services.yaml

@@ -24,7 +24,7 @@ services:
     # add more service definitions when explicit configuration is needed
     # please note that last definitions always *replace* previous ones
 
-    App\Service\MysqliConnection:
+    App\Service\DatabaseCredentials:
         arguments:
             $hostname: '%env(string:DATABASE_HOSTNAME)%'
             $user: '%env(string:DATABASE_USER)%'

src/Console/BackupDatabase.php

@@ -0,0 +1,42 @@
+<?php
+
+namespace App\Console;
+
+use App\Service\DatabaseManager;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Question\Question;
+
+class BackupDatabase extends Command
+{
+    protected static $defaultName = 'app:db:create';
+
+    public function __construct(
+        private DatabaseManager $db,
+    )
+    {
+        parent::__construct();
+    }
+
+    protected function configure(): void
+    {
+        $this->addArgument('name', InputArgument::OPTIONAL, 'Database name');
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output): int
+    {
+        $question = $this->getHelper('question');
+
+        if (!$name = $input->getArgument('name')) {
+            $name = $question->ask($input, $output, new Question('Database name: '));
+        }
+
+        $this->db->createDatabase($name);
+
+        $output->writeln(sprintf('Database "%s" successfully created', $name));
+
+        return Command::SUCCESS;
+    }
+}

src/Service/DatabaseCredentials.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace App\Service;
+
+class DatabaseCredentials
+{
+    public function __construct(
+        private string $hostname,
+        private string $user,
+        private string $password,
+    )
+    {
+    }
+
+    public function getHostname(): string
+    {
+        return $this->hostname;
+    }
+
+    public function getUser(): string
+    {
+        return $this->user;
+    }
+
+    public function getPassword(): string
+    {
+        return $this->password;
+    }
+}

src/Service/MysqliConnection.php

@@ -8,9 +8,9 @@ class MysqliConnection
 {
     private mysqli $connection;
 
-    public function __construct($hostname, $user, $password)
+    public function __construct(DatabaseCredentials $credentials)
     {
-        $this->connection = new mysqli($hostname, $user, $password);
+        $this->connection = new mysqli($credentials->getHostname(), $credentials->getUser(), $credentials->getPassword());
         if ($this->connection->connect_error) {
             throw new \Exception("Connection failed: " . $this->connection->connect_error);
         }

src/Service/Traits/SelectDatabaseQuestion.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace App\Service\Traits;
+
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Question\ChoiceQuestion;
+
+trait SelectDatabaseQuestion
+{
+    private function getDatabaseName(InputInterface $input, OutputInterface $output): string
+    {
+        $question = $this->getHelper('question');
+
+        if (!$name = $input->getArgument('name')) {
+            $selectQuestion = new ChoiceQuestion('Database name: ', $this->db->listDatabases());
+            $name = $question->ask($input, $output, $selectQuestion);
+        }
+
+        return $name;
+    }
+}