# Lunch Picker Backend

Express API server for Lunch Picker miniapp.

## Modes

- Memory mode: run without MySQL env vars (quick local demo)
- MySQL mode: set `MYSQL_HOST` (or `MYSQL_URL`) and run with real DB

## 1) Install

```bash
cd backend
npm install
cp .env.example .env
```

## 2) Start

```bash
npm start
```

Server: `http://localhost:4000`

## 3) MySQL setup

1. Create DB (example)

```sql
create database lunch_picker character set utf8mb4 collate utf8mb4_0900_ai_ci;
```

2. Apply schema

```bash
mysql -u root -p lunch_picker < ../docs/db/schema.sql
```

3. Set `.env` values (`MYSQL_HOST`, `MYSQL_USER`, `MYSQL_PASSWORD`, `MYSQL_DATABASE`)

When MySQL mode starts, seed data is inserted automatically only when `restaurant` table is empty.

## API Endpoints

- `GET /v1/health`
- `GET /v1/restaurants/nearby`
- `GET /v1/restaurants/:restaurantId`
- `GET /v1/restaurants/:restaurantId/reviews`
- `POST /v1/restaurants/:restaurantId/reviews`
- `DELETE /v1/reviews/:reviewId`
- `POST /v1/restaurants/:restaurantId/like`
- `GET /v1/users/me/reviews`

## Auth Simulation

Set `x-user-id` header to simulate user identity.

Example:

```bash
curl -H "x-user-id: demo-user-1" "http://localhost:4000/v1/restaurants/nearby?lat=37.501&lng=127.037&radiusMeters=1000&sort=distance"
```