# syntax=docker/dockerfile:1.7

# ---- deps ----
FROM node:20-alpine AS deps
WORKDIR /app
COPY package.json package-lock.json ./
# --legacy-peer-deps: Tailwind 4 alpha + React 19 peer-dep mismatches.
RUN --mount=type=cache,target=/root/.npm \
    npm ci --legacy-peer-deps --no-audit --no-fund


# ---- builder ----
FROM node:20-alpine AS builder
WORKDIR /app
ENV NEXT_TELEMETRY_DISABLED=1
# NEXT_PUBLIC_* must be present at `npm run build` — Next.js inlines them into
# the client bundle. Defaults to empty so local `docker build` без build-args не ломается.
ARG NEXT_PUBLIC_GLITCHTIP_DSN=
ARG NEXT_PUBLIC_ENVIRONMENT=production
ENV NEXT_PUBLIC_GLITCHTIP_DSN=$NEXT_PUBLIC_GLITCHTIP_DSN
ENV NEXT_PUBLIC_ENVIRONMENT=$NEXT_PUBLIC_ENVIRONMENT
COPY --from=deps /app/node_modules ./node_modules
COPY . .
RUN npm run build


# ---- runner ----
FROM node:20-alpine AS runner
WORKDIR /app
# Next.js standalone server.js binds to `process.env.HOSTNAME || '0.0.0.0'`.
# Docker auto-sets HOSTNAME to the container id, so without this the server binds
# that hostname and the compose healthcheck (TCP 127.0.0.1:3000) is refused →
# container shows "(unhealthy)" although it serves fine via Caddy (service name).
# Pin 0.0.0.0 so it listens on all interfaces and the healthcheck connects.
ENV NODE_ENV=production \
    NEXT_TELEMETRY_DISABLED=1 \
    PORT=3000 \
    HOSTNAME=0.0.0.0

# `node` user (uid 1000) ships with the alpine image.
COPY --from=builder --chown=node:node /app/public ./public
COPY --from=builder --chown=node:node /app/.next/standalone ./
COPY --from=builder --chown=node:node /app/.next/static ./.next/static

USER node

EXPOSE 3000
CMD ["node", "server.js"]