use std::sync::Arc;
use sysinfo::System;
use tokio::sync::RwLock;

pub struct CpuMonitor {
    sys: Arc<RwLock<System>>,
}

impl CpuMonitor {
    pub fn new() -> Self {
        let mut sys = System::new();
        sys.refresh_cpu_all();
        Self {
            sys: Arc::new(RwLock::new(sys)),
        }
    }

    pub async fn cpu_usage(&self) -> f32 {
        let mut sys = self.sys.write().await;
        sys.refresh_cpu_all();
        sys.global_cpu_usage()
    }

    pub async fn can_accept_task(
        &self,
        max_concurrent: usize,
        cpu_threshold: f32,
        running: usize,
    ) -> bool {
        if running >= max_concurrent {
            return false;
        }
        let cpu = self.cpu_usage().await;
        cpu < cpu_threshold
    }
}

impl Default for CpuMonitor {
    fn default() -> Self {
        Self::new()
    }
}