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use std::fmt::Debug;

use futures::future::{join_all, BoxFuture};
use log::debug;
use serde_json::Value;
use uuid::Uuid;

#[derive(Debug)]
pub enum Event {
    ControllerPaired { id: Uuid },
    ControllerUnpaired { id: Uuid },
    CharacteristicValueChanged { aid: u64, iid: u64, value: Value },
}

#[derive(Default)]
pub struct EventEmitter {
    listeners: Vec<Box<dyn (Fn(&Event) -> BoxFuture<()>) + Send + Sync>>,
}

impl EventEmitter {
    pub fn new() -> EventEmitter { EventEmitter { listeners: vec![] } }

    pub fn add_listener(&mut self, listener: Box<dyn (Fn(&Event) -> BoxFuture<()>) + Send + Sync>) {
        self.listeners.push(listener);
    }

    pub async fn emit(&self, event: &Event) {
        debug!("emitting event: {:?}", event);

        join_all(self.listeners.iter().map(|listener| listener(&event))).await;
    }
}