# Build stage
FROM node:20-alpine AS builder

WORKDIR /app

# Copy package files first for layer caching
COPY package.json package-lock.json* ./

# Install all dependencies for build
RUN npm ci

# Copy source files
COPY . .

# Build the frontend
RUN npm run build

# Production stage
FROM node:20-alpine AS runner

WORKDIR /app

# Create non-root user for security (consistent UID/GID 1001)
RUN addgroup -g 1001 -S nodejs && \
    adduser -S nodejs -u 1001 -G nodejs

# Set environment
ENV NODE_ENV=production
ENV SERVER_PORT=3001
ENV RATE_LIMIT_PER_MINUTE=5
ENV CORS_ORIGIN=*
ENV LOG_LEVEL=info
ENV ZOHO_ENABLED=false
ENV ZOHO_API_DOMAIN=https://www.zohoapis.com
ENV ZOHO_CLIENT_ID=
ENV ZOHO_CLIENT_SECRET=
ENV ZOHO_REFRESH_TOKEN=
ENV ZOHO_REDIRECT_URI=

# Create app directory structure
RUN mkdir -p /app/db /app/logs

# Set permissions for db directory (before USER switch)
RUN chown -R nodejs:nodejs /app/db /app/logs

# Copy from builder - built artifacts and package manifests
COPY --from=builder /app/package.json /app/package-lock.json* ./
COPY --from=builder /app/dist ./dist
COPY --from=builder /app/server ./server

# Install production dependencies only in runtime stage
RUN npm ci --omit=dev

# Expose backend port
EXPOSE 3001

# Switch to non-root user (standard approach, no su-exec needed)
USER nodejs

# Health check using Node 20 built-in fetch (no wget required)
HEALTHCHECK --interval=30s --timeout=3s --start-period=10s --retries=3 \
    CMD node -e "fetch('http://localhost:3001/api/health').then(r => r.ok ? 0 : 1).catch(() => 1)" || exit 1

# Run the Express server
CMD ["node", "server/index.js"]
