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import gleam/erlang/process.{type Subject, Normal}
import gleam/option.{None}
import gleam/otp/actor.{type Next, Continue, Stop}
import gleam/set.{type Set}
const timeout = 1000
pub type Message(k) {
Shutdown
Check(key: k, client: Subject(Bool))
Add(key: k)
Drop(key: k)
Pop(client: Subject(Result(k, Nil)))
}
fn handle_message(message: Message(k), set: Set(k)) -> Next(Message(k), Set(k)) {
case message {
Shutdown -> Stop(Normal)
Check(key, client) -> {
process.send(client, set.contains(set, key))
Continue(set, None)
}
Add(key) -> Continue(set.insert(set, key), None)
Drop(key) -> Continue(set.delete(set, key), None)
Pop(client) -> {
case set.to_list(set) {
[next, ..] -> {
process.send(client, Ok(next))
Continue(set.delete(set, next), None)
}
[] -> {
process.send(client, Error(Nil))
Stop(Normal)
}
}
}
}
}
pub fn start_actor(with: Set(a)) {
let assert Ok(actor) = actor.start(with, handle_message)
actor
}
pub fn pop(actor) {
process.call(actor, Pop, timeout)
}
pub fn check(actor, value) {
process.call(actor, Check(value, _), timeout)
}
pub fn drop(actor, value) {
process.send(actor, Drop(value))
}
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