added api logic, vitest, minimal testing ui

api/src/routes/variable-categories.ts

@@ -0,0 +1,85 @@
+
+import { FastifyPluginAsync } from "fastify";
+import { Prisma } from "@prisma/client";
+import { z } from "zod";
+import { prisma } from "../prisma.js";
+
+const NewCat = z.object({
+  name: z.string().min(1).max(100),
+  percent: z.number().int().min(0).max(100),
+  isSavings: z.boolean().default(false),
+  priority: z.number().int().min(0).max(10_000),
+});
+const PatchCat = NewCat.partial();
+const IdParam = z.object({ id: z.string().min(1) });
+
+async function assertPercentTotal100(tx: Prisma.TransactionClient, userId: string) {
+  const g = await tx.variableCategory.groupBy({
+    by: ["userId"],
+    where: { userId },
+    _sum: { percent: true },
+  });
+  const sum = g[0]?._sum.percent ?? 0;
+  if (sum !== 100) {
+    const err: any = new Error(`Percents must sum to 100 (got ${sum}).`);
+    err.statusCode = 400;
+    err.code = "PERCENT_TOTAL_NOT_100";
+    throw err;
+  }
+}
+
+const plugin: FastifyPluginAsync = async (app) => {
+  // CREATE
+  app.post("/api/variable-categories", async (req, reply) => {
+    const userId = req.userId;
+    const body = NewCat.safeParse(req.body);
+    if (!body.success) return reply.status(400).send({ error: "INVALID_BODY", details: body.error.flatten() });
+
+    const created = await prisma.$transaction(async (tx) => {
+      const rec = await tx.variableCategory.create({
+        data: { ...body.data, userId },
+        select: { id: true },
+      });
+      await assertPercentTotal100(tx, userId);
+      return rec;
+    });
+
+    return reply.status(201).send(created);
+  });
+
+  // UPDATE
+  app.patch("/api/variable-categories/:id", async (req, reply) => {
+    const userId = req.userId;
+    const pid = IdParam.safeParse(req.params);
+    const patch = PatchCat.safeParse(req.body);
+    if (!pid.success) return reply.status(400).send({ error: "INVALID_ID", details: pid.error.flatten() });
+    if (!patch.success) return reply.status(400).send({ error: "INVALID_BODY", details: patch.error.flatten() });
+
+    await prisma.$transaction(async (tx) => {
+      const exists = await tx.variableCategory.findFirst({ where: { id: pid.data.id, userId } });
+      if (!exists) return reply.status(404).send({ error: "NOT_FOUND" });
+      await tx.variableCategory.update({ where: { id: pid.data.id }, data: patch.data });
+      await assertPercentTotal100(tx, userId);
+    });
+
+    return reply.send({ ok: true });
+  });
+
+  // DELETE
+  app.delete("/api/variable-categories/:id", async (req, reply) => {
+    const userId = req.userId;
+    const pid = IdParam.safeParse(req.params);
+    if (!pid.success) return reply.status(400).send({ error: "INVALID_ID", details: pid.error.flatten() });
+
+    await prisma.$transaction(async (tx) => {
+      const exists = await tx.variableCategory.findFirst({ where: { id: pid.data.id, userId } });
+      if (!exists) return reply.status(404).send({ error: "NOT_FOUND" });
+      await tx.variableCategory.delete({ where: { id: pid.data.id } });
+      await assertPercentTotal100(tx, userId);
+    });
+
+    return reply.send({ ok: true });
+  });
+};
+
+export default plugin;