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

events { worker_connections 1024; }

http {
    include /etc/nginx/mime.types;
    default_type application/octet-stream;

    log_format main '$remote_addr - $remote_user [$time_local] "$request" '
                    '$status $body_bytes_sent "$http_referer" '
                    '"$http_user_agent" rt=$request_time';
    access_log /var/log/nginx/access.log main;
    error_log /var/log/nginx/error.log;
    sendfile on;
    keepalive_timeout 65;

    upstream router_api { server router:9000; }
    upstream dashboard_ui { server dashboard:3000; }
    upstream litellm_backend { server litellm:4000; }

    server {
        listen 80;

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

        # Disable buffering for SSE streams
        proxy_buffering off;

        # API — through router
        location /v1/ {
            proxy_pass http://router_api;
            proxy_http_version 1.1;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header Authorization $http_authorization;
            proxy_connect_timeout 10s;
            proxy_read_timeout 600s;
            proxy_buffering off;
        }

        # SSE streaming endpoint
        location /stream {
            proxy_pass http://router_api;
            proxy_http_version 1.1;
            proxy_set_header Host $host;
            proxy_set_header Connection "";
            proxy_buffering off;
            chunked_transfer_encoding off;
        }

        # Dashboard API proxy for SSE
        location /api/ {
            proxy_pass http://dashboard_ui;
            proxy_http_version 1.1;
            proxy_set_header Host $host;
            proxy_buffering off;
        }

        # LiteLLM debug
        location /litellm/ {
            rewrite ^/litellm/(.*) /$1 break;
            proxy_pass http://litellm_backend;
            proxy_http_version 1.1;
            proxy_set_header Host $host;
            proxy_set_header Authorization $http_authorization;
        }

        # Dashboard
        location / {
            proxy_pass http://dashboard_ui;
            proxy_http_version 1.1;
            proxy_set_header Host $host;
            proxy_buffering off;
        }

        location /health {
            proxy_pass http://router_api/health;
            proxy_http_version 1.1;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
        }
    }
}