use anyhow::Result;
use log::*;
use tokio::{
  select, 
  sync::watch, 
  time::{
    Duration,
    self, 
}};

use crate::config::RuntimeConfigAcme;
use crate::messages;

pub struct AcmeActor {
  email: String,
  last_ports: messages::PublicExposedPorts,
  refresh: Duration,

  rx_ports: watch::Receiver<messages::PublicExposedPorts>,
}

impl AcmeActor {
  pub async fn new(
      config: Option<RuntimeConfigAcme>,
      rxp: &watch::Receiver<messages::PublicExposedPorts>
      ) -> Result<Option<Self>> {

    if config.is_none() {
      return Ok(None);
    }
    let config = config.unwrap();

    let ctx = Self { 
      email: config.email,
      last_ports: messages::PublicExposedPorts::new(),  
      refresh: config.refresh_time,
      rx_ports: rxp.clone(),
    };

    Ok(Some(ctx))
  }

  pub async fn listen(&mut self) -> Result<()> {
    let mut interval = time::interval(self.refresh);
    loop {
      // 1. Wait for an event
      let new_ports = select! {
        Some(ports) = self.rx_ports.recv() => Some(ports),
        _ = interval.tick() => None,
        else => return Ok(()) // Sender dropped, terminate loop.
      };

      // 2. Update last ports if needed
      if let Some(p) = new_ports { self.last_ports = p; }

      // 3. Flush IGD requests
      match self.do_acme().await {
        Ok(()) => debug!("Successfully updated ACME"),
        Err(e) => error!("An error occured while updating ACME. {}", e),
      }
    }
  }

  pub async fn do_acme(&self) -> Result<()> {
    debug!("Doing ACME!!!");
    debug!("{:#?}", self.last_ports);

    Ok(())
  }
}