# Amazon Accounts Receivable Aging Dashboard

Automates the Finance team's month-end **Amazon Accounts Receivable Aging** workbook:
upload the month's Amazon *Custom Unified Transaction* files → get a structurally- and
financially-identical Accounts Receivable Aging workbook, with validation, settlement
reconciliation, exceptions, drill-down, and an audit trail.

**Amazon only** (no Walmart/TikTok/Temu/Shein/eBay/Shopify). Reverse-engineered from the
Jan-2026 files; the USA receivable reproduces to the penny (**11,110,433 = `Detail!D11`**).
See [docs/accounts-receivable-logic.md](docs/accounts-receivable-logic.md).

## Layout
```
backend/
  app/core/        # streaming parser + receivable engine (stdlib + openpyxl only)
  app/api/         # FastAPI app (uploads, jobs, endpoints) — Phase 3
  tests/           # unit + Jan-2026 reconciliation integration test
  cli.py           # process files from the command line
frontend/          # React + TS + Vite dashboard — Phase 4
docs/
```

## Run the app
```bash
# 1. Configure MySQL (hosted RDS) + data paths
cp example.env .env   # then fill in MYSQL_* credentials

# Option A — Docker (backend + Vite hot reload)
docker compose up --build
# → http://localhost:5173  (API on :8000; uploads/exports on the ar_data volume)

# Option B — local processes
make install          # backend deps + npm install
make backend          # terminal 1 → FastAPI on :8000
make frontend         # terminal 2 → dashboard on http://localhost:5173
```
Then open http://localhost:5173 → **New Closing** → pick the month → drag in the three Amazon
files → **Run processing** → review → **Download Full A/R Aging Excel**.

Uploads and exports are stored under `AR_DATA_DIR` (default `backend/data` locally, `/data` in Docker).
The app connects to MySQL using `MYSQL_*` variables from `.env`.

## Run the engine headless (CLI)
```bash
cd backend && pip install -r requirements.txt
python cli.py "/path/USA…01 to 10 January,2026.xlsx" \
              "/path/USA…11 to 20 January,2026.xlsx" \
              "/path/USA…21 to 31 January,2026.xlsx" \
              --month-end 2026-01-31 --lag 2 --reserve-standard 125.44 --out AR_Aging_Jan26.xlsx
```

## Tests
```bash
make test        # 16 fast tests (engine, export, API, robustness)
make test-all    # + Jan-2026 reconciliation & sample-comparison (integration, ~4 min)
# point tests at the sample files if not in the repo root:
AR_SAMPLE_DIR="/path/to/samples" make test-all
```

## Status — all phases complete (incl. v2 multi-market)
- ✅ **Engine** — settlement classification + receivable; USA = **11,110,433** verified to the penny
- ✅ **Multi-marketplace** — all 13 markets (CA/UK/AU/IE + localized FR/DE/IT/ES/NL/PL/SV/TR)
  reconcile **to the penny** vs the Jan-26 workbook; per-market currency & FX; settlement-owner
  logic for cross-market EU chains; helper-row & pivot-sheet detection
- ✅ **AR roll-forward** — opening balance (auto carry-forward) + net revenue − payouts = closing;
  AR Ledger · Finance Summary · Journal Entry (per-marketplace) · Reconciliation Control w/ sign-off
- ✅ **Header mapping** — localized alias tables + admin rules UI (`/api/mapping-rules`); unmapped
  amounts are never silently excluded
- ✅ **Storage-fee detection** — canonical + description-based (potential/missing storage exceptions)
- ✅ **Excel** — Full audit workbook + Summary Finance pack
- ✅ **Tests** — ~60 fast + integration (USA reconciliation, sample comparison, 13-market benchmark)