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//! ref: composer/src/Composer/EventDispatcher/EventSubscriberInterface.php
use indexmap::IndexMap;
use shirabe_php_rpc::PhpObjHandle;
/// Represents one event's subscriber info: method name only, method+priority, or multiple handlers.
#[derive(Debug)]
pub enum SubscribedEventEntry {
Method(String),
MethodWithPriority(String, Option<i64>),
Methods(Vec<(String, Option<i64>)>),
}
// The sole implementor is the PHP plugin proxy (plugins are the only subscribers in Composer
// itself), so the trait deviates from the PHP shape in two deliberate ways: the PHP-side static
// `getSubscribedEvents()` takes `&self` here (the receiver carries which PHP class to call, and
// an associated function would not be dyn-compatible), and it is fallible because the answer
// crosses the RPC boundary.
pub trait EventSubscriberInterface {
/// Returns an array of event names this subscriber wants to listen to.
fn get_subscribed_events(&self) -> anyhow::Result<IndexMap<String, SubscribedEventEntry>>;
/// The subscriber as it crosses the wire: PHP's `[$subscriber, $method]` array callables
/// capture the subscriber object itself, represented here by its P-table handle.
fn subscriber_handle(&self) -> PhpObjHandle;
}
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