# =============================================================================
# Stage 1: Build
# =============================================================================
FROM node:20-alpine AS builder

WORKDIR /app

# Install dependencies first (layer cache optimization)
COPY package.json package-lock.json* ./
RUN npm ci --legacy-peer-deps

# Copy source
COPY . .

# Build Next.js
ENV NEXT_TELEMETRY_DISABLED=1
RUN npm run build

# =============================================================================
# Stage 2: Runtime (minimal Node.js image)
# =============================================================================
FROM node:20-alpine AS runtime

# Install dumb-init for proper signal handling
RUN apk add --no-cache dumb-init

WORKDIR /app

# Copy built artifacts from builder
COPY --from=builder /app/.next .next
COPY --from=builder /app/public ./public
COPY --from=builder /app/package.json ./
COPY --from=builder /app/node_modules ./node_modules

ENV NODE_ENV=production
ENV NEXT_TELEMETRY_DISABLED=1

# Non-root user for security
RUN addgroup -g 1001 -S nodejs && \
    adduser -S nextjs -u 1001
USER nextjs

EXPOSE 3000

# Health check
HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
  CMD wget -qO- http://localhost:3000/api/health || exit 1

ENTRYPOINT ["dumb-init", "--"]
CMD ["node_modules/.bin/next", "start","-H", "0.0.0.0"]