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use rxr::{subjects::AsyncSubject, subscribe::Subscriber};
use rxr::{ObservableExt, Observer, Subscribeable};

pub fn create_subscriber(subscriber_id: i32) -> Subscriber<i32> {
    Subscriber::new(
        move |v| println!("Subscriber #{} emitted: {}", subscriber_id, v),
        |_| eprintln!("Error"),
        move || println!("Completed {}", subscriber_id),
    )
}

pub fn main() {
    // Initialize a `AsyncSubject` and obtain its emitter and receiver.
    let (mut emitter, mut receiver) = AsyncSubject::emitter_receiver();

    // Registers `Subscriber` 1.
    receiver.subscribe(create_subscriber(1));

    emitter.next(101); // Stores 101 ast the latest value.
    emitter.next(102); // Latest value is now 102.

    // All Observable operators can be applied to the receiver.
    // Registers mapped `Subscriber` 2.
    receiver
        .clone() // Shallow clone: clones only the pointer to the `AsyncSubject` object.
        .map(|v| format!("mapped {}", v))
        .subscribe(Subscriber::new(
            move |v| println!("Subscriber #2 emitted: {}", v),
            |_| eprintln!("Error"),
            || println!("Completed 2"),
        ));

    // Registers `Subscriber` 3.
    receiver.subscribe(create_subscriber(3));

    emitter.next(103); // Latest value is now 103.

    // Emits latest value (103) to registered `Subscriber`'s 1, 2 and 3 and calls
    // `complete` on each of them.
    emitter.complete();

    // Subscriber 4: post-completion subscribe, emits latest value (103) and completes.
    receiver.subscribe(create_subscriber(4));

    emitter.next(104); // Called post-completion, does not emit.
}