# ============================================
# Stage 1: Dependencies
# ============================================
FROM node:20-alpine AS deps

WORKDIR /app

# Package files만 먼저 복사 (캐싱 최적화)
COPY package.json package-lock.json ./

# 의존성 설치
RUN npm ci --only=production

# ============================================
# Stage 2: Builder
# ============================================
FROM node:20-alpine AS builder

WORKDIR /app

# 의존성 복사
COPY package.json package-lock.json ./
RUN npm ci

# 소스 코드 복사
COPY . .

# 빌드 시점에 환경 변수 주입 (NEXT_PUBLIC_* 변수만)
ARG NEXT_PUBLIC_BASE_PATH
ARG NEXT_PUBLIC_KAKAO_APP_KEY
ARG NEXT_PUBLIC_SUPABASE_URL
ARG NEXT_PUBLIC_SUPABASE_ANON_KEY
ARG NEXT_PUBLIC_PORTONE_IMP_CODE

ENV NEXT_PUBLIC_BASE_PATH=$NEXT_PUBLIC_BASE_PATH
ENV NEXT_PUBLIC_KAKAO_APP_KEY=$NEXT_PUBLIC_KAKAO_APP_KEY
ENV NEXT_PUBLIC_SUPABASE_URL=$NEXT_PUBLIC_SUPABASE_URL
ENV NEXT_PUBLIC_SUPABASE_ANON_KEY=$NEXT_PUBLIC_SUPABASE_ANON_KEY
ENV NEXT_PUBLIC_PORTONE_IMP_CODE=$NEXT_PUBLIC_PORTONE_IMP_CODE

# Next.js 빌드 (standalone 모드)
RUN npm run build

# ============================================
# Stage 3: Runner
# ============================================
FROM node:20-alpine AS runner

WORKDIR /app

# 보안을 위해 non-root 유저 생성
RUN addgroup --system --gid 1001 nodejs
RUN adduser --system --uid 1001 nextjs

# 필요한 파일만 복사
COPY --from=builder /app/public ./public
COPY --from=builder /app/.next/standalone ./
COPY --from=builder /app/.next/static ./.next/static

# 권한 설정
RUN chown -R nextjs:nodejs /app

USER nextjs

# 포트 설정
EXPOSE 3000

# 환경 변수
ENV NODE_ENV=production
ENV PORT=3000
ENV HOSTNAME="0.0.0.0"

# 헬스체크
HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
  CMD node -e "require('http').get('http://localhost:3000/api/health', (r) => {process.exit(r.statusCode === 200 ? 0 : 1)})"

# 실행
CMD ["node", "server.js"]