66 lines
2.9 KiB
Markdown
66 lines
2.9 KiB
Markdown
# monk-code-screen
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Billing/invoicing/payments backend skeleton. Bun + Hono + `bun:sqlite` (zero network deps at runtime; TS runs natively, no build step).
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## ⚡ START COMMAND (sticky)
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```sh
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bun run dev # http://localhost:3000, hot reload
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```
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Other commands:
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```sh
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bun run start # no watch
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bun run db:reset # wipe data.db and reseed
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bunx tsc --noEmit # typecheck
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```
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## Layout
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```
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src/index.ts Hono app + routes
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src/ingest.ts CSV parser/normalizer + transactional insert (shared by seed and POST /ingest)
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src/db.ts opens data.db, applies schema, seeds from invoices.csv if empty (runs on import)
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src/schema.sql customers / invoices / payments (idempotent)
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invoices.csv seed data — deliberately messy; DO NOT MODIFY
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```
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DB is `data.db` at repo root (WAL, FK on). Boot always re-applies schema, so adding a table = edit schema.sql + restart.
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## Routes
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```sh
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curl localhost:3000/health
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curl localhost:3000/customers
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curl localhost:3000/customers/<cus_id>/invoices
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curl localhost:3000/invoice/INV-1011 # by invoice_number or surrogate inv_ id
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curl -X POST localhost:3000/ingest --data-binary @invoices.csv
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curl -X POST localhost:3000/payment/INV-1011 \
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-H 'content-type: application/json' \
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-d "{\"idempotency_key\":\"$(uuidgen)\",\"amount\":1500000,\"currency\":\"USD\"}"
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```
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- `POST /ingest`: CSV as raw request body. Rows failing validation (negative values, empty currency, missing/unparseable amount or dates) are still stored, with status `corrupted`. Returns `{ status, ingested, errors, rows }`. No idempotency — re-posting the same file appends duplicates.
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- `GET /invoice/:id`: invoice (with status) + its payments (with PSP-owned status). Resolves surrogate id or invoice_number (newest wins on duplicate numbers).
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- `POST /payment/:invoice_id`: zod-validated `{idempotency_key: uuid, amount, currency}`; only `open`/`partially_paid` invoices are payable (409 otherwise — includes `corrupted`), repeated key replays the original payment (200), else inserts a `pending` payment (201).
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Money is stored as integer minor units (cents): CSV `150` → `15000`.
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## Seed data
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Seeded by ingesting `invoices.csv` (25 rows → 22 open + 3 corrupted, 21 customers):
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- `INV-1006` (line 7): empty currency code
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- `INV-1010`: negative quantity and amount
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- `INV-1020`: missing amount
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Duplicate invoice numbers (`INV-1001` ×2, `INV-1006` reused) are ingested as-is — not a validation rule on the canvas. Customers dedupe by email case-insensitively (`Acme Corp`/`ACME CORPORATION`/`acme corp` → one customer); rows without email get a customer keyed by name.
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## Extension cheatsheet (interview)
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- New route: add to `src/index.ts`, `db.query(...).all()/get()`, `db.run(sql, [params])`
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- Multi-write: `db.transaction(() => { ... })()`
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- Validation: `z.object({...}).safeParse(await c.req.json())`
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- New table: append `CREATE TABLE IF NOT EXISTS` to schema.sql, restart (or `db:reset` if changing existing tables)
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