refactor: unify response-code parsing

Signed-off-by: Sebastian Krupinski <krupinski01@gmail.com>

lib/Client/Protocol/Command/AppendCommand.php

@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace KTXM\ProviderImap\Client\Protocol\Command;
 
+use KTXM\ProviderImap\Client\Protocol\Parser\ResponseCodeParser;
 use KTXM\ProviderImap\Client\Protocol\StringEncoder;
 use KTXM\ProviderImap\Client\ImapException;
 use KTXM\ProviderImap\Client\Protocol\RequestFrame;
@@ -26,6 +27,7 @@ use KTXM\ProviderImap\Client\Protocol\SessionState;
  */
 final class AppendCommand implements CommandInterface
 {
+    private readonly ResponseCodeParser $responseCodeParser;
     private readonly string $literal;
 
     /**
@@ -36,6 +38,8 @@ final class AppendCommand implements CommandInterface
         string $message,
         private readonly array $flags = [],
     ) {
+        $this->responseCodeParser = new ResponseCodeParser();
+
         // IMAP literals are octet-counted; normalise to CRLF line endings.
         $this->literal = (string) preg_replace('/\r\n|\r|\n/', "\r\n", $message);
     }
@@ -87,13 +91,18 @@ final class AppendCommand implements CommandInterface
         throw new ImapException('APPEND did not receive a tagged completion response.');
     }
 
-
     private function parseAppendUid(string $text): ?int
     {
-        if (preg_match('/\[APPENDUID\s+\d+\s+(\d+)\]/i', $text, $matches) === 1) {
-            return (int) $matches[1];
+        $responseCode = $this->responseCodeParser->parse($text);
+        if ($responseCode === null || $responseCode['name'] !== 'APPENDUID') {
+            return null;
         }
 
-        return null;
+        $arguments = $responseCode['arguments'];
+        if (count($arguments) !== 2 || !ctype_digit($arguments[0]) || !ctype_digit($arguments[1])) {
+            return null;
+        }
+
+        return (int) $arguments[1];
     }
 }