# 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

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

# Copy entrypoint script
COPY docker-entrypoint.sh /usr/local/bin/
RUN chmod +x /usr/local/bin/docker-entrypoint.sh

# 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

# Install su-exec for switching to non-root user
RUN apk add --no-cache su-exec && \
    rm -rf /var/cache/apk/*

# Expose backend port
EXPOSE 3001

# 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 via entrypoint (runs as root, then switches to nodejs)
ENTRYPOINT ["docker-entrypoint.sh"]
CMD ["node", "server/index.js"]
