FROM oven/bun:latest AS base

# Install dependencies only when needed
FROM base AS deps
WORKDIR /app

# Install dependencies based on the preferred package manager
COPY package.json bun.lock ./
RUN bun install --frozen-lockfile

# Rebuild the source code only when needed
FROM base AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .

# Next.js checks for environment variables during build to inline them
# We need to make sure we don't need the runtime env vars strictly at build time
# or provide dummy values if needed.
# However, usually build works fine without runtime-specific urls if coded correctly.
ENV NEXT_TELEMETRY_DISABLED 1

RUN bun run build

# Production image, copy all the files and run next
FROM base AS runner
WORKDIR /app

ENV NODE_ENV production
ENV NEXT_TELEMETRY_DISABLED 1

RUN groupadd -g 1001 -r nodejs
RUN useradd -u 1001 -r -g nodejs -s /bin/false -m nextjs

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

# Automatically leverage output traces to reduce image size
# https://nextjs.org/docs/advanced-features/output-file-tracing
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
# set hostname to localhost
ENV HOSTNAME "0.0.0.0"

CMD ["bun", "server.js"]