/**
* Lädt alle Kommentare eines Autors.
*
* @param string $author E-Mail-Adresse des Autors
*
* @return Comment[]
*/
public function getCommentsByAuthor($author)
{
try {
$db = $this->getConnection();

$sql = "
SELECT
id,
article_id,
CASE
WHEN parent_comment_id IS NULL THEN NULL
WHEN parent_comment_id = '' THEN NULL
WHEN parent_comment_id = 0 THEN NULL
ELSE parent_comment_id
END AS parent_comment_id,
author,
content,
created
FROM comments
WHERE author = :author
ORDER BY created DESC
";

$command = $db->prepare($sql);

$command->execute([
":author" => $author
]);

$comments = [];

while ($row = $command->fetch(PDO::FETCH_ASSOC)) {
$parentCommentId = null;

if (
isset($row["parent_comment_id"])
&& $row["parent_comment_id"] !== null
&& $row["parent_comment_id"] !== ""
&& intval($row["parent_comment_id"]) !== 0
) {
$parentCommentId = intval($row["parent_comment_id"]);
}

$comments[] = new Comment(
intval($row["id"]),
intval($row["article_id"]),
$parentCommentId,
$row["author"],
$row["content"],
$row["created"]
);
}

return $comments;

} catch (PDOException $e) {
throw new RuntimeException(
"Kommentare konnten nicht geladen werden."
);
}
}