Dockerfile.backend

# syntax=docker/dockerfile:1

# ── Build stage ──────────────────────────────────────────────────────────────
FROM node:20-alpine AS builder

WORKDIR /app

# Install build dependencies
RUN apk add --no-cache python3 make g++

# Copy workspace files
COPY package*.json ./
COPY backend/package*.json ./backend/

# Install dependencies
RUN npm install --legacy-peer-deps

# Copy source code
COPY backend ./backend

# Build TypeScript
WORKDIR /app/backend
RUN npm run build

# ── Runtime stage ────────────────────────────────────────────────────────────
FROM node:20-alpine

WORKDIR /app

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

# Create non-root user for security
RUN addgroup -g 1001 -S nodejs
RUN adduser -S backend -u 1001

# Copy built application from builder
COPY --from=builder --chown=backend:nodejs /app/backend/dist ./backend/dist
COPY --from=builder --chown=backend:nodejs /app/backend/package*.json ./backend/

# Install only production dependencies
WORKDIR /app/backend
RUN npm ci --only=production && npm cache clean --force

# Switch to non-root user
USER backend

EXPOSE 3001

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=10s --retries=3 \
  CMD node -e "require('http').get('http://localhost:3001/api/health', (r) => {if (r.statusCode !== 200) throw new Error(r.statusCode)})"

ENTRYPOINT ["dumb-init", "--"]
CMD ["npm", "start"]