use crate::event::Event;

pub mod stream;

pub fn conversation(event: Event) -> Option<crate::conversation::Event> {
    match event {
        Event::Conversation(conversation) => Some(conversation),
        _ => None,
    }
}

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

pub fn user(event: Event) -> Option<crate::user::Event> {
    match event {
        Event::User(event) => Some(event),
        _ => None,
    }
}

pub mod conversation {
    use crate::conversation::{Event, event};

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

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

pub mod message {
    use crate::message::{Event, event};

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

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

pub mod user {
    use crate::user::{Event, event};

    // This could be defined as `-> event::Created`. However, I want the interface to be consistent
    // with the event stream transformers for other types, and we'd have to refactor the return type
    // to `-> Option<event::Created>` the instant users sprout a second event, anyways.
    #[allow(clippy::unnecessary_wraps)]
    pub fn created(event: Event) -> Option<event::Created> {
        match event {
            Event::Created(event) => Some(event),
        }
    }
}