# Multi-stage build for Next.js application
FROM node:20-alpine AS base

# Install dependencies only when needed
FROM base AS deps
# Check https://github.com/nodejs/docker-node/tree/b4117f9333da4138b03a546ec926ef50a31506c3#nodealpine to understand why libc6-compat might be needed.
RUN apk add --no-cache libc6-compat
WORKDIR /app

# Install dependencies based on the preferred package manager
COPY package.json package-lock.json* ./
RUN npm ci

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

# Generate Prisma Client
# Build-time DATABASE_URL (not persisted in final image)
ARG DATABASE_URL="mysql://build:build@localhost:3306/build"
RUN npx prisma generate

# Build the application
# Next.js NEXT_PUBLIC_* variables must be available at build time
ARG NEXT_PUBLIC_KAKAO_MAP_KEY
ENV NEXT_PUBLIC_KAKAO_MAP_KEY=$NEXT_PUBLIC_KAKAO_MAP_KEY
ENV NEXT_TELEMETRY_DISABLED=1
RUN npm run build

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

RUN apk add --no-cache curl

ENV NODE_ENV=production
ENV NEXT_TELEMETRY_DISABLED=1

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

# Copy built application
COPY --from=builder /app/public ./public

# Set the correct permission for prerender cache
RUN mkdir .next && chown nextjs:nodejs .next

# 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

# Copy Prisma files
COPY --from=builder /app/prisma ./prisma

USER nextjs

EXPOSE 3000

ENV PORT=3000
ENV HOSTNAME=0.0.0.0

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
  CMD curl -f http://localhost:3000/api/health || exit 1

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