FROM node:20-alpine

WORKDIR /app

# Install dependencies first (layer cache)
COPY package.json ./
RUN npm install --omit=dev

# Copy source
COPY src/ ./src/

# Data directory (override with a volume)
RUN mkdir -p /app/data

EXPOSE 3456

ENV NODE_ENV=production
ENV STORE_PATH=/app/data/store.json

CMD ["node", "src/server.js"]