#--------------------------------------------
# Stage: building TypeScript
#--------------------------------------------
FROM node:20 AS build-stage

ENV WORKDIR=/app
WORKDIR /app

COPY ./package*.json ./

# instaliram pakete
RUN npm i && npm cache clean --force

COPY ./tsconfig.json ./
COPY ./src ./src
RUN npm run build

#--------------------------------------------
# Stage: installing production node_modules
#--------------------------------------------
FROM node:20 AS package-stage

WORKDIR /app

COPY ./package*.json ./

# install ONLY production dependencies
RUN npm i --omit=dev && npm cache clean --force

#--------------------------------------------
# Stage: preparing final image
#--------------------------------------------
FROM gcr.io/distroless/nodejs:20 AS assembly-stage

WORKDIR /app

ARG PORT
ENV PORT=${PORT}

# (optional) App label to be used in Prometheus (Grafana)
ARG PROMETHEUS_APP_LABEL
ENV PROMETHEUS_APP_LABEL=${PROMETHEUS_APP_LABEL}=${PROMETHEUS_APP_LABEL}

# (optional) Prometheus histogram bucket sizes (grafana)
ARG PROMETHEUS_HISTOGRAM_BUCKETS
ENV PROMETHEUS_HISTOGRAM_BUCKETS=${PROMETHEUS_HISTOGRAM_BUCKETS}=${PROMETHEUS_HISTOGRAM_BUCKETS}

# (optional) enables logging to stdout
ARG DEBUG
ENV DEBUG=${DEBUG}

# copying node_modules
COPY  --from=package-stage /app/package*.json ./
COPY  --from=package-stage /app/node_modules ./node_modules

# copying built files
COPY  --from=build-stage /app/build ./server

# running the server under limited "nobody" user
USER nobody:nobody

HEALTHCHECK --interval=30s --timeout=3s --start-period=10s \
   CMD ["/nodejs/bin/node", "./server/healthcheck.js"]

# starting the server
CMD ["./server/entry.js"]