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

WORKDIR /app/frontend

COPY frontend/package*.json ./
RUN npm ci

COPY frontend/ ./
RUN npm run build

# Stage 2: Production Server
FROM node:20-alpine

WORKDIR /app

# Install production dependencies
COPY backend/package*.json ./
RUN npm ci --only=production && \
    npm cache clean --force

# Copy backend source
COPY backend/ ./

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

# Create temp upload directory
RUN mkdir -p /app/temp && \
    chown -R node:node /app

# Switch to non-root user
USER node

# Expose port
EXPOSE 3000

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

# Start server
CMD ["node", "src/server.js"]