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use crate::action::{Action, StatefulAction};
use crate::comm::{QWriter, Signal};
use crate::resource::{IoManager, ResourceManager};
use crate::server::{AsyncSignal, Config, State, SyncSignal};
use crate::util::spin_sleeper;
use eyre::Result;
use serde::{Deserialize, Serialize};
use std::sync::{Arc, Mutex};
use std::thread;
use std::time::Duration;

#[derive(Debug, Deserialize, Serialize)]
#[serde(deny_unknown_fields)]
pub struct Wait(f32);

stateful_arc!(Wait { duration: Duration });

impl Wait {
    pub fn new(dur: f32) -> Self {
        Self(dur)
    }
}

impl Action for Wait {
    fn stateful(
        &self,
        _io: &IoManager,
        _res: &ResourceManager,
        _config: &Config,
        _sync_writer: &QWriter<SyncSignal>,
        _async_writer: &QWriter<AsyncSignal>,
    ) -> Result<Box<dyn StatefulAction>> {
        Ok(Box::new(StatefulWait {
            done: Arc::new(Mutex::new(Ok(false))),
            duration: Duration::from_secs_f32(self.0),
        }))
    }
}

impl StatefulAction for StatefulWait {
    impl_stateful!();

    #[inline]
    fn start(
        &mut self,
        sync_writer: &mut QWriter<SyncSignal>,
        _async_writer: &mut QWriter<AsyncSignal>,
        _state: &State,
    ) -> Result<Signal> {
        let done = self.done.clone();
        let duration = self.duration;
        let mut sync_writer = sync_writer.clone();
        thread::spawn(move || {
            spin_sleeper().sleep(duration);
            *done.lock().unwrap() = Ok(true);
            sync_writer.push(SyncSignal::UpdateGraph);
        });
        Ok(Signal::none())
    }
}