#--------------------------------------------
# Stage: building TypeScript
#--------------------------------------------
FROM node:18 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: instaliram produkcijski node_modules
#--------------------------------------------
FROM node:18 as package-stage

WORKDIR /app

COPY ./package*.json ./

# instaliram SAMO produkcijske
RUN npm i --only=production && npm cache clean --force

#--------------------------------------------
# Stage: priprema finalnog image-a
#--------------------------------------------
FROM gcr.io/distroless/nodejs:18 as assembly-stage

WORKDIR /app

ARG PORT="3000"
ENV PORT=${PORT}

# prometheus config
ARG PROMETHEUS_APP_LABEL
ENV PROMETHEUS_APP_LABEL=${PROMETHEUS_APP_LABEL}

ARG PROMETHEUS_HISTOGRAM_BUCKETS
ENV PROMETHEUS_HISTOGRAM_BUCKETS=${PROMETHEUS_HISTOGRAM_BUCKETS}

# (optional) logiranje na stdout (moguće opcije: "server:server", "server:metrics", "server:healthcheck" )
ARG DEBUG
ENV DEBUG=${DEBUG}

# kopiram node-modules
COPY  --from=package-stage /app/package*.json ./
COPY  --from=package-stage /app/node_modules ./node_modules

# kopiram buildane datoteke
COPY  --from=build-stage /app/build/ ./server

# server vrtim pod ograničenim "nobody" korisnikom
USER nobody:nobody

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

# pokrećem server
CMD ["./server/entry.js"]