use eyre::Result;
use async_trait::async_trait;
use tokio::task::spawn_local;
use std::time::Instant;
use std::sync::Arc;
use tokio::sync::oneshot;
use tokio::sync::mpsc;
use crate::event::Event;

use crate::endpoint::Endpoint;
use crate::irc_endpoint::IrcEndpoint;

pub struct RircdState {
    endpoints: Vec<Arc<dyn Endpoint>>,
    //to determine program runtime
    creation_timestamp: Option<Instant>,

    plainlog: Option<()>,
    sqlite_log: Option<()>,
    postgres_log: Option<()>,
}

impl RircdState {
    pub fn new() -> Result<Self> {
        //TODO remove (for testing)
        let eps: Vec<Arc<dyn Endpoint>> = vec![
            Arc::new(IrcEndpoint {} ),
        ];

        //TODO impl
        Ok(RircdState {
            endpoints: eps,
            //endpoints: vec![],
            creation_timestamp: Some(Instant::now()),
            plainlog: None,
            sqlite_log: None,
            postgres_log: None,
        })
    }

    //TODO impl
    pub fn from_config(config: String) -> Result<Self> {
        Self::new()
    }

    pub async fn run(mut self) -> Result<()> {
        //TODO choose good default/custom chan size
        let (event_sender,mut event_receiver) = mpsc::channel::<Event>(64);

        //try to start each endpoint
        self.endpoints.iter().filter(|ep| ep.is_active()).for_each(|endpoint| {
            let endpoint_name = endpoint.name();
            let (success_status_send,success_status_recv) = oneshot::channel::<Result<()>>();
            tokio::spawn(endpoint.clone().listen(success_status_send, event_sender.to_owned()));
            //TODO color err msg
            //TODO paralelize and sync at the end
            futures::executor::block_on(async move {
                println!("starting {} | {}", endpoint_name,
                    match success_status_recv.await {
                        Ok(_) => format!("SUCCEEDED |"),
                        Err(e) => format!("FAILED | <{}>", e),
                    });
            });
        });

        //TODO Err() if not at least one Endpoint is running because
        //if none is running there is no way to activate further (user locked out)
        //> who needs a daemon that does nothing and where nothing can be configured to be done
        

        tokio::select! {
            event = event_receiver.recv() => {
                ()
            },
        }

        Ok(())
    }
}