# Upstream backend servers
upstream backend {
    server backend:8080;  # Changed from 8000 to 8080 to match FastAPI port
    keepalive 32;
}

# Main server configuration
server {
    listen 80;
    server_name localhost;
    
    root /usr/share/nginx/html;
    index index.html;

    # Frontend static files
    location / {
        try_files $uri $uri/ /index.html;
        expires -1;
        add_header Cache-Control "no-store, no-cache, must-revalidate";
    }
    
    # Backend API proxy
    location /api/ {
        proxy_pass http://backend/api/;  # Added /api/ to ensure proper path rewriting
        
        # Proxy headers
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
        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
        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;
    }

    # Security headers
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header Referrer-Policy "no-referrer-when-downgrade" always;
}