# Nginx configuration for React SPA + FastAPI backend proxy
# Optimized for production deployment with gzip compression and caching

server {
    listen 80;
    server_name _;

    # Root directory for static files
    root /usr/share/nginx/html;
    index index.html;

    # Security headers
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-XSS-Protection "1; mode=block" always;

    # Gzip compression for performance
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_types text/plain text/css text/xml text/javascript
               application/x-javascript application/xml+rss
               application/javascript application/json
               application/xml image/svg+xml;

    # Backend proxy shared settings (used by /api/ and /categories/)
    # API proxy to backend service
    # All requests to /api/* are proxied to the backend container
    location /api/ {
        proxy_pass http://backend:8001;
        proxy_http_version 1.1;

        # Internal API key for backend authentication
        proxy_set_header X-API-Key changeme;

        # Preserve original request information
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;

        # Timeouts for long-running operations
        proxy_connect_timeout 60s;
        proxy_send_timeout 600s;
        proxy_read_timeout 600s;

        # Disable buffering for streaming responses
        proxy_buffering off;
        proxy_request_buffering off;
    }

    # Categories API proxy (used by CategoryManagement)
    location /categories/ {
        proxy_pass http://backend:8001;
        proxy_http_version 1.1;

        proxy_set_header X-API-Key changeme;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;

        proxy_connect_timeout 60s;
        proxy_send_timeout 120s;
        proxy_read_timeout 120s;
    }

    # Static assets caching (JS, CSS, images, fonts)
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
        access_log off;
    }

    # React Router - SPA fallback routing
    # All non-file requests return index.html for client-side routing
    location / {
        try_files $uri $uri/ /index.html;

        # No caching for index.html (always fetch latest)
        add_header Cache-Control "no-cache, no-store, must-revalidate";
        add_header Pragma "no-cache";
        add_header Expires "0";
    }

    # Health check endpoint (for Coolify/Docker monitoring)
    location /health {
        access_log off;
        return 200 "healthy\n";
        add_header Content-Type text/plain;
    }

    # Error pages
    error_page 404 /index.html;
    error_page 500 502 503 504 /index.html;

    # Logging
    access_log /var/log/nginx/access.log;
    error_log /var/log/nginx/error.log warn;
}