use std::future::{self, Ready};

use crate::event::Event;

pub fn channel(event: Event) -> Ready<Option<channel::Event>> {
    future::ready(match event {
        Event::Channel(channel) => Some(channel),
        _ => None,
    })
}

pub fn message(event: Event) -> Ready<Option<message::Event>> {
    future::ready(match event {
        Event::Message(event) => Some(event),
        _ => None,
    })
}

pub fn login(event: Event) -> Ready<Option<login::Event>> {
    future::ready(match event {
        Event::Login(event) => Some(event),
        _ => None,
    })
}

pub mod channel {
    use std::future::{self, Ready};

    pub use crate::channel::Event;
    use crate::channel::event;

    pub fn created(event: Event) -> Ready<Option<event::Created>> {
        future::ready(match event {
            Event::Created(event) => Some(event),
            Event::Deleted(_) => None,
        })
    }

    pub fn deleted(event: Event) -> Ready<Option<event::Deleted>> {
        future::ready(match event {
            Event::Deleted(event) => Some(event),
            Event::Created(_) => None,
        })
    }
}

pub mod message {
    use std::future::{self, Ready};

    pub use crate::message::Event;
    use crate::message::event;

    pub fn sent(event: Event) -> Ready<Option<event::Sent>> {
        future::ready(match event {
            Event::Sent(event) => Some(event),
            Event::Deleted(_) => None,
        })
    }

    pub fn deleted(event: Event) -> future::Ready<Option<event::Deleted>> {
        future::ready(match event {
            Event::Deleted(event) => Some(event),
            Event::Sent(_) => None,
        })
    }
}

pub mod login {
    use std::future::{self, Ready};

    pub use crate::login::Event;
    use crate::login::event;

    pub fn created(event: Event) -> Ready<Option<event::Created>> {
        future::ready(match event {
            Event::Created(event) => Some(event),
        })
    }
}