worker_processes auto;
pid /run/nginx.pid;
error_log /var/log/nginx/error.log warn;

events {
    worker_connections 256;
}

http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;
    sendfile      on;
    keepalive_timeout 65;

    # Logging
    access_log /var/log/nginx/access.log;

    # Gzip compression
    gzip on;
    gzip_types text/plain text/css application/json application/javascript text/xml;

    server {
        listen 7860;
        server_name _;

        # Max upload size (for seed documents)
        client_max_body_size 50M;

        # Flask backend API
        location /api/ {
            proxy_pass http://127.0.0.1:5001;
            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;

            # Long timeout for simulations (up to 10 minutes)
            proxy_read_timeout 600s;
            proxy_connect_timeout 30s;
            proxy_send_timeout 600s;
        }

        # Health check endpoint
        location /health {
            proxy_pass http://127.0.0.1:5001;
            proxy_set_header Host $host;
            proxy_read_timeout 10s;
        }

        # Vue SPA (static files)
        location / {
            root /usr/share/nginx/html;
            index index.html;
            try_files $uri $uri/ /index.html;
        }
    }
}