Durchführungstag im bestehenden Löschpattern entfernen

modules/market_management/service.php

@@ -953,6 +953,49 @@ function market_management_set_occurrence_archive(PDO $pdo, int $occurrenceId, b
 
 function market_management_delete_day(PDO $pdo, int $dayId): array
 {
+    $dayStmt = $pdo->prepare(
+        'SELECT id, occurrence_id, date
+         FROM market_occurrence_day
+         WHERE id = :id'
+    );
+    $dayStmt->execute([':id' => $dayId]);
+    $day = $dayStmt->fetch();
+    if (!is_array($day)) {
+        throw new RuntimeException('Durchführungstag nicht gefunden.');
+    }
+
+    $countStmt = $pdo->prepare(
+        'SELECT COUNT(*)
+         FROM market_occurrence_day
+         WHERE occurrence_id = :occurrence_id'
+    );
+    $countStmt->execute([':occurrence_id' => (int) $day['occurrence_id']]);
+    if ((int) $countStmt->fetchColumn() <= 1) {
+        throw new InvalidArgumentException('Die Durchführung muss mindestens einen Durchführungstag behalten.');
+    }
+
+    $firstDayStmt = $pdo->prepare(
+        'SELECT id
+         FROM market_occurrence_day
+         WHERE occurrence_id = :occurrence_id
+         ORDER BY date ASC, id ASC
+         LIMIT 1'
+    );
+    $firstDayStmt->execute([':occurrence_id' => (int) $day['occurrence_id']]);
+    if ((int) $firstDayStmt->fetchColumn() === $dayId) {
+        throw new InvalidArgumentException('Der erste Durchführungstag kann nicht gelöscht werden.');
+    }
+
+    $salesStmt = $pdo->prepare(
+        'SELECT COUNT(*)
+         FROM sales_order
+         WHERE market_occurrence_day_id = :day_id'
+    );
+    $salesStmt->execute([':day_id' => $dayId]);
+    if ((int) $salesStmt->fetchColumn() > 0) {
+        throw new InvalidArgumentException('Ein Durchführungstag mit Verkäufen kann nicht gelöscht werden.');
+    }
+
     $stmt = $pdo->prepare('DELETE FROM market_occurrence_day WHERE id = :id RETURNING id, occurrence_id, date');
     $stmt->execute([':id' => $dayId]);
     $day = $stmt->fetch();