worker_processes 1;
error_log /var/log/nginx/error.log warn;
pid /run/nginx/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"';

    access_log /var/log/nginx/access.log main;
    sendfile on;
    keepalive_timeout 65;

    # Temp paths (writable by non-root)
    client_body_temp_path /run/nginx/client_temp;
    proxy_temp_path       /run/nginx/proxy_temp;
    fastcgi_temp_path     /run/nginx/fastcgi_temp;
    uwsgi_temp_path       /run/nginx/uwsgi_temp;
    scgi_temp_path        /run/nginx/scgi_temp;

    # Gzip compression
    gzip on;
    gzip_types text/plain text/css application/json application/javascript text/xml;
    gzip_min_length 256;
    gzip_vary on;

    # WebSocket upgrade map (must be before server block)
    map $http_upgrade $connection_upgrade {
        default upgrade;
        ''      '';
    }

    # Upstreams
    upstream airflow {
        server 127.0.0.1:8080;
        keepalive 4;
    }

    upstream refresh {
        server 127.0.0.1:5000;
        keepalive 2;
    }

    server {
        listen 7860;
        server_name _;
        client_max_body_size 100M;

        # 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;
        add_header Referrer-Policy strict-origin-when-cross-origin always;

        # ---- Refresh service ----
        location /refresh {
            proxy_pass http://refresh;
            proxy_set_header Host $host;
            proxy_set_header Connection "";
            proxy_http_version 1.1;
            proxy_read_timeout 120s;
        }

        location /config {
            proxy_pass http://refresh;
            proxy_set_header Host $host;
            proxy_set_header Connection "";
            proxy_http_version 1.1;
        }

        location /health {
            proxy_pass http://refresh;
            proxy_set_header Host $host;
            proxy_set_header Connection "";
            proxy_http_version 1.1;
        }

        location /status {
            proxy_pass http://refresh;
            proxy_set_header Host $host;
            proxy_set_header Connection "";
            proxy_http_version 1.1;
        }

        # ---- Airflow webserver ----
        location / {
            proxy_pass http://airflow;
            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_http_version 1.1;
            proxy_set_header Connection "";
            proxy_read_timeout 300s;
            proxy_connect_timeout 75s;

            # WebSocket support (for live log tailing)
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection $connection_upgrade;
        }
    }
}