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

WORKDIR /app/frontend

# Copy frontend package files
COPY frontend/package*.json ./

# Install dependencies
RUN npm ci

# Copy frontend source
COPY frontend/ ./

# Build frontend
RUN npm run build

# ============================================
# Stage 2: Build Backend
# ============================================
FROM node:20-alpine AS backend-builder

WORKDIR /app/backend

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

# Install dependencies
RUN npm ci

# Copy backend source
COPY backend/ ./

# Build TypeScript
RUN npm run build

# ============================================
# Stage 3: Production
# ============================================
FROM node:20-alpine AS production

WORKDIR /app

# Copy backend package files and install production deps
COPY backend/package*.json ./
RUN npm ci --omit=dev && npm cache clean --force

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

# Copy built frontend to the location expected by backend
COPY --from=frontend-builder /app/frontend/dist ./frontend/dist

# Set environment
ENV NODE_ENV=production
ENV PORT=3000

# Expose port
EXPOSE 3000

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=10s --retries=3 \
  CMD wget --no-verbose --tries=1 --spider http://localhost:3000/health || exit 1

# Start the application
CMD ["node", "dist/server.js"]