# Install dependencies only when needed
FROM node:18-alpine AS deps
WORKDIR /app
COPY webapp/package.json webapp/package-lock.json ./
RUN npm ci

# Rebuild the source code only when needed
FROM node:18-alpine AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY webapp .

# Set build-time environment variables with defaults
ARG DB_URI
ENV DB_URI=$DB_URI

# Next.js collects completely anonymous telemetry data about general usage.
ENV NEXT_TELEMETRY_DISABLED 1

# Disable Next.js static optimization during build
ENV NEXT_TELEMETRY_DISABLED 1
ENV NEXT_SHARP_PATH /tmp/node_modules/sharp

# If DB_URI is not set, use a dummy value for build
RUN if [ -z "$DB_URI" ]; then \
      echo "DB_URI not set, using dummy value for build"; \
      export DB_URI="mongodb://dummy:password@localhost:27017/dummy"; \
    fi && \
    npm run build

# Production image, copy all the files and run next
FROM node:18-alpine AS runner
WORKDIR /app

ENV NODE_ENV production
ENV NEXT_TELEMETRY_DISABLED 1

RUN addgroup --system --gid 1001 nodejs
RUN adduser --system --uid 1001 nextjs

COPY --from=builder /app/public ./public

# Automatically leverage output traces to reduce image size
COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static

USER nextjs

EXPOSE 3000

ENV PORT 3000
ENV HOSTNAME "0.0.0.0"

# Use the runtime environment variables
CMD ["node", "server.js"]