# Build stage
FROM node:26-alpine AS builder

WORKDIR /app

COPY package.json package-lock.json* ./
RUN npm install

COPY . .

# Baked in at build time. DOCS_BASE_URL must agree with three things at once:
# the Nginx Proxy Manager location that routes to this container, the directory
# the runtime stage serves from below, and this value. When they disagree the
# HTML loads and every stylesheet and script 404s.
ARG DOCS_URL="https://vantage.hostxtra.co.uk"
ARG DOCS_BASE_URL="/docs/"
ARG APP_URL="https://vantage.hostxtra.co.uk"
ARG HQ_URL="https://vantage-hq.hostxtra.co.uk"
ENV DOCS_URL=$DOCS_URL
ENV DOCS_BASE_URL=$DOCS_BASE_URL
ENV APP_URL=$APP_URL
ENV HQ_URL=$HQ_URL

RUN npm run build

# Runtime stage
#
# Docusaurus emits a fully static site, so unlike web/, site/ and adminsite/
# there is no Node server at runtime. alpine-slim is roughly a quarter the size
# of caddy:alpine, and nothing here needs automatic TLS — the host proxy
# terminates it.
FROM nginx:alpine-slim AS runner

# NPM forwards the FULL request path upstream; it does not strip the /docs
# prefix. Serving from a matching subdirectory means prefix, asset URLs and
# upstream paths agree with no rewrite rule to keep in step.
COPY --from=builder /app/build /usr/share/nginx/html/docs
COPY nginx.conf /etc/nginx/conf.d/default.conf

EXPOSE 80