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use std::fmt::Debug;
use async_trait::async_trait;

use crate::cache::Cacheable;

pub enum Completion<T, E>
    where
        T: Clone + Send + Sync + 'static,
        E: Debug + Clone + Send + Sync + 'static

{
    Total(T),
    Partial((T, E)),
    Error(E),
}

impl<T, E> Clone for Completion<T, E>
    where
        T: Clone + Send + Sync + 'static,
        E: Debug + Clone + Send + Sync + 'static
{
    fn clone(&self) -> Self {
        match self {
            Completion::Total(t) => Completion::Total(t.clone()),
            Completion::Partial((t, e)) => Completion::Partial((t.clone(), e.clone())),
            Completion::Error(e) => Completion::Error(e.clone())
        }
    }
}

pub struct OutputEvent<T, E>
    where
        T: Clone + Send + Sync + 'static,
        E: Debug + Clone + Send + Sync + 'static
{
    pub completed_event: Completion<T, E>,
    pub identities: Vec<Vec<u8>>,
}


impl<T, E> Clone for OutputEvent<T, E>
    where
        T: Clone + Send + Sync + 'static,
        E: Debug + Clone + Send + Sync + 'static
{
    fn clone(&self) -> Self {
        Self {
            completed_event: self.completed_event.clone(),
            identities: self.identities.clone(),
        }
    }
}

impl<T, E> OutputEvent<T, E>
    where
        T: Clone + Send + Sync + 'static,
        E: Debug + Clone + Send + Sync + 'static
{

    pub fn new(completed_event: Completion<T, E>) -> Self {
        Self {
            completed_event,
            identities: Vec::new()
        }
    }

    pub fn add_identity(&mut self, identity: impl Cacheable) {
        self.identities.push(identity.identity())
    }

}

#[async_trait]
pub trait EventHandler {
    type InputEvent;
    type OutputEvent: Clone + Send + Sync + 'static;
    type Error: Debug + Clone + Send + Sync + 'static;

    async fn handle_event(&mut self, input: Self::InputEvent) -> OutputEvent<Self::OutputEvent, Self::Error>;
}