first commit

backend/src/services/tariff.service.ts

@@ -0,0 +1,71 @@
+import { PrismaClient } from '@prisma/client';
+
+const prisma = new PrismaClient();
+
+export async function getTariffsByProvider(providerId: number, includeInactive = false) {
+  const where: { providerId: number; isActive?: boolean } = { providerId };
+  if (!includeInactive) {
+    where.isActive = true;
+  }
+  return prisma.tariff.findMany({
+    where,
+    orderBy: { name: 'asc' },
+    include: {
+      _count: {
+        select: { contracts: true },
+      },
+    },
+  });
+}
+
+export async function getTariffById(id: number) {
+  return prisma.tariff.findUnique({
+    where: { id },
+    include: {
+      provider: true,
+      _count: {
+        select: { contracts: true },
+      },
+    },
+  });
+}
+
+export async function createTariff(data: {
+  providerId: number;
+  name: string;
+}) {
+  return prisma.tariff.create({
+    data: {
+      ...data,
+      isActive: true,
+    },
+  });
+}
+
+export async function updateTariff(
+  id: number,
+  data: {
+    name?: string;
+    isActive?: boolean;
+  }
+) {
+  return prisma.tariff.update({
+    where: { id },
+    data,
+  });
+}
+
+export async function deleteTariff(id: number) {
+  // Check if tariff is used by any contracts
+  const count = await prisma.contract.count({
+    where: { tariffId: id },
+  });
+
+  if (count > 0) {
+    throw new Error(
+      `Tarif kann nicht gelöscht werden, da er von ${count} Verträgen verwendet wird`
+    );
+  }
+
+  return prisma.tariff.delete({ where: { id } });
+}