billing skeleton: bun + hono + sqlite, seed + happy path

src/index.ts

@@ -0,0 +1,72 @@
+import { Hono } from "hono";
+import { logger } from "hono/logger";
+import { z } from "zod";
+import { db } from "./db";
+
+const app = new Hono();
+app.use(logger());
+
+app.get("/health", (c) => c.json({ ok: true }));
+
+// --- Customers -------------------------------------------------------------
+
+app.get("/customers", (c) => {
+  return c.json(db.query("SELECT * FROM customers ORDER BY created_at").all());
+});
+
+app.get("/customers/:id/invoices", (c) => {
+  const rows = db
+    .query("SELECT * FROM invoices WHERE customer_id = ? ORDER BY created_at DESC")
+    .all(c.req.param("id"));
+  return c.json(rows);
+});
+
+// --- Subscriptions (happy path: subscribe -> first invoice) -----------------
+
+const CreateSubscription = z.object({
+  customer_id: z.string(),
+  plan_id: z.string(),
+});
+
+app.post("/subscriptions", async (c) => {
+  const parsed = CreateSubscription.safeParse(await c.req.json().catch(() => null));
+  if (!parsed.success) return c.json({ error: z.treeifyError(parsed.error) }, 400);
+  const { customer_id, plan_id } = parsed.data;
+
+  const customer = db.query("SELECT id FROM customers WHERE id = ?").get(customer_id);
+  if (!customer) return c.json({ error: "customer not found" }, 404);
+
+  const plan = db
+    .query<{ id: string; amount_cents: number; currency: string; interval: string }, [string]>(
+      "SELECT * FROM plans WHERE id = ?",
+    )
+    .get(plan_id);
+  if (!plan) return c.json({ error: "plan not found" }, 404);
+
+  const subId = `sub_${crypto.randomUUID().slice(0, 8)}`;
+  const invId = `inv_${crypto.randomUUID().slice(0, 8)}`;
+
+  db.transaction(() => {
+    db.run(
+      `INSERT INTO subscriptions (id, customer_id, plan_id, status, current_period_start, current_period_end)
+       VALUES (?, ?, ?, 'active', datetime('now'), datetime('now', ?))`,
+      [subId, customer_id, plan_id, `+1 ${plan.interval}`],
+    );
+    db.run(
+      `INSERT INTO invoices (id, subscription_id, customer_id, amount_cents, currency, status, due_at)
+       VALUES (?, ?, ?, ?, ?, 'open', datetime('now', '+14 days'))`,
+      [invId, subId, customer_id, plan.amount_cents, plan.currency],
+    );
+  })();
+
+  const subscription = db.query("SELECT * FROM subscriptions WHERE id = ?").get(subId);
+  const invoice = db.query("SELECT * FROM invoices WHERE id = ?").get(invId);
+  return c.json({ subscription, invoice }, 201);
+});
+
+export default {
+  port: Number(process.env.PORT ?? 3000),
+  fetch: app.fetch,
+};
+
+console.log(`listening on http://localhost:${process.env.PORT ?? 3000}`);