use anyhow::Result;

pub fn ejecutar(formato: &str) -> Result<()> {
    let mut system = sysinfo::System::new_all();
    system.refresh_all();

    std::thread::sleep(sysinfo::MINIMUM_CPU_UPDATE_INTERVAL);

    let hostname = sysinfo::System::host_name().unwrap_or_default();
    let kernel = sysinfo::System::kernel_version().unwrap_or_default();
    let os_version = sysinfo::System::os_version().unwrap_or_default();
    let uptime_secs = sysinfo::System::uptime();

    match formato {
        "json" => {
            let info = serde_json::json!({
                "hostname": hostname,
                "kernel": kernel,
                "os": os_version,
                "cpus": system.cpus().len(),
                "memory_total_gb": system.total_memory() as f64 / 1024.0 / 1024.0 / 1024.0,
                "memory_used_gb": system.used_memory() as f64 / 1024.0 / 1024.0 / 1024.0,
                "memory_percent": system.used_memory() as f64 / system.total_memory() as f64 * 100.0,
                "uptime_seconds": uptime_secs,
            });
            println!("{}", serde_json::to_string_pretty(&info)?);
        }
        _ => {
            println!("-- Informacion del sistema --");
            println!("  Hostname: {}", hostname);
            println!("  Kernel:   {}", kernel);
            println!("  SO:       {}", os_version);
            println!(
                "  CPU(s):   {} nucleos ({}%)",
                system.cpus().len(),
                system.global_cpu_usage()
            );
            println!(
                "  Memoria:  {:.2} GB / {:.2} GB ({:.1}%)",
                system.used_memory() as f64 / 1024.0 / 1024.0 / 1024.0,
                system.total_memory() as f64 / 1024.0 / 1024.0 / 1024.0,
                system.used_memory() as f64 / system.total_memory() as f64 * 100.0
            );
            println!(
                "  Swap:     {:.2} GB / {:.2} GB",
                system.used_swap() as f64 / 1024.0 / 1024.0 / 1024.0,
                system.total_swap() as f64 / 1024.0 / 1024.0 / 1024.0
            );
            println!("  Activo:   {} horas", uptime_secs / 3600);
            println!("------------------------------");
        }
    }

    Ok(())
}