# ── base: shared dependency install ──────────────────────────────
FROM node:20-slim AS base
WORKDIR /app
COPY package.json package-lock.json ./
RUN npm ci
COPY . .

# ── dev: Astro dev server with HMR ─────────────────────────────
FROM base AS dev
ENV HOST=0.0.0.0
EXPOSE 4321
CMD ["npx", "astro", "dev", "--host", "0.0.0.0", "--port", "4321"]

# ── build: static site generation ───────────────────────────────
FROM base AS build
RUN npx astro build

# ── prod: Caddy serving static files ───────────────────────────
FROM caddy:2-alpine AS prod
COPY Caddyfile /etc/caddy/Caddyfile
COPY --from=build /app/dist /srv
EXPOSE 80
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
  CMD wget -qO- http://127.0.0.1:80/health || exit 1