# ---- Production Dockerfile for NestJS backend ----
# Multi-stage build: compile TypeScript, then run with minimal image

# Stage 1: Build
FROM node:20-alpine AS builder
WORKDIR /app
COPY package*.json ./
RUN npm ci
COPY . .
# VERSION must be copied into the build context before `docker build`.
# In CI / deploy scripts run: cp VERSION backend/VERSION  (or pass --build-arg)
COPY VERSION ./
RUN npm run build

# Stage 2: Production
FROM node:20-alpine
WORKDIR /app

# Only install production dependencies
COPY package*.json ./
RUN npm ci --omit=dev && npm cache clean --force

# Copy compiled output, New Relic preload, and VERSION from builder
COPY --from=builder /app/dist ./dist
COPY --from=builder /app/newrelic-preload.js ./newrelic-preload.js
COPY --from=builder /app/VERSION ./VERSION

# New Relic agent — configured entirely via environment variables
ENV NEW_RELIC_NO_CONFIG_FILE=true
ENV NEW_RELIC_DISTRIBUTED_TRACING_ENABLED=true
ENV NEW_RELIC_LOG=stdout

EXPOSE 3000

# Preload the New Relic agent (activates only when NEW_RELIC_ENABLED=true)
CMD ["node", "-r", "./newrelic-preload.js", "dist/main"]