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use lunatic::spawn_link;
use lunatic_message_request::{MessageRequest, ProcessRequest};
use serde::{Deserialize, Serialize};

#[derive(Serialize, Deserialize)]
enum Message {
    Inc,
    Dec,
    Count(MessageRequest<(), i32>),
}

fn main() {
    let counter = spawn_link!(|mailbox: Mailbox<Message>| {
        let mut count = 0;

        loop {
            let msg = mailbox.receive();
            match msg {
                Message::Inc => count += 1,
                Message::Dec => count -= 1,
                Message::Count(req) => req.reply(count),
            }
        }
    });

    // Initial count should be 0
    let count = counter.request(Message::Count, ());
    assert_eq!(count, 0);

    // Increment count
    counter.send(Message::Inc);

    // Count should now be 1
    let count = counter.request(Message::Count, ());
    assert_eq!(count, 1);
}