FROM node:22-alpine

WORKDIR /app

COPY package.json package-lock.json ./
RUN npm ci --omit=optional --no-audit --no-fund

COPY tsconfig.json vitest.config.ts ./
COPY src ./src
COPY static ./static

ENV BOARD_DIST_DIR=/output
ENV BOARD_TICK_SEC=300

# Healthcheck: index.html exists AND was written within the last (tick * 2)s.
# If render is stuck, container goes unhealthy → operator sees it in
# `docker ps` and `docker compose ps` without parsing logs.
HEALTHCHECK --interval=60s --timeout=10s --start-period=120s --retries=2 \
  CMD [ -f /output/index.html ] \
   && [ $(( $(date +%s) - $(stat -c %Y /output/index.html) )) -lt $((BOARD_TICK_SEC * 2)) ] \
   || exit 1

# Failures go to stderr so `docker compose logs` clearly flags them;
# `|| true` prevents the loop from exiting (we want it to keep retrying).
ENTRYPOINT ["/bin/sh", "-c", "while true; do node --experimental-strip-types src/cli.ts \"$BOARD_CONFIG_PATH\" || >&2 echo \"[$(date -Iseconds)] render failed; will retry in ${BOARD_TICK_SEC}s\"; sleep ${BOARD_TICK_SEC}; done"]