# Build stage
FROM mirror.gcr.io/library/node:22-slim AS builder

WORKDIR /app

# Copy package files
COPY package*.json ./

# Install dependencies with retry and fallback registry
# Primary: npmjs.org, Fallback: npmmirror.com (China mirror, globally accessible)
RUN npm config set fetch-retries 3 && \
    npm config set fetch-retry-mintimeout 20000 && \
    npm config set fetch-retry-maxtimeout 120000 && \
    npm install || \
    (npm config set registry https://registry.npmmirror.com && npm install)

# Copy source files
COPY . .

# Note: REACT_APP_API_URL is intentionally NOT set here
# The frontend uses relative URLs (same domain) in production
# API calls go to /api/* which the ingress routes to the backend

# Build the app (CRA produces /build, not /dist)
RUN npm run build

# Production stage
FROM mirror.gcr.io/library/nginx:alpine

# Copy built assets from builder stage (CRA outputs to /build)
COPY --from=builder /app/build /usr/share/nginx/html

# Copy nginx config for SPA routing
RUN echo 'server { \
    listen 80; \
    server_name _; \
    root /usr/share/nginx/html; \
    index index.html; \
    \
    # Gzip compression \
    gzip on; \
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript; \
    \
    # Cache static assets \
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ { \
        expires 1y; \
        add_header Cache-Control "public, immutable"; \
    } \
    \
    # SPA fallback - serve index.html for all routes \
    location / { \
        try_files $uri $uri/ /index.html; \
    } \
}' > /etc/nginx/conf.d/default.conf

EXPOSE 80

CMD ["nginx", "-g", "daemon off;"]