import valid from "semver/functions/valid.js";
import major from "semver/functions/major.js";
class ProxyBus {
  bus;
  constructor(bus2) {
    if (typeof bus2.getVersion !== "function" || !valid(bus2.getVersion())) {
      console.warn("Proxying an event bus with an unknown or invalid version");
    } else if (major(bus2.getVersion()) !== major(this.getVersion())) {
      console.warn(
        "Proxying an event bus of version " + bus2.getVersion() + " with " + this.getVersion()
      );
    }
    this.bus = bus2;
  }
  getVersion() {
    return "3.3.2";
  }
  subscribe(name, handler) {
    this.bus.subscribe(name, handler);
  }
  unsubscribe(name, handler) {
    this.bus.unsubscribe(name, handler);
  }
  emit(name, ...event) {
    this.bus.emit(name, ...event);
  }
}
class SimpleBus {
  handlers = /* @__PURE__ */ new Map();
  getVersion() {
    return "3.3.2";
  }
  subscribe(name, handler) {
    this.handlers.set(
      name,
      (this.handlers.get(name) || []).concat(
        handler
      )
    );
  }
  unsubscribe(name, handler) {
    this.handlers.set(
      name,
      (this.handlers.get(name) || []).filter((h) => h !== handler)
    );
  }
  emit(name, ...event) {
    const handlers = this.handlers.get(name) || [];
    handlers.forEach((h) => {
      try {
        ;
        h(event[0]);
      } catch (e) {
        console.error("could not invoke event listener", e);
      }
    });
  }
}
let bus = null;
function getBus() {
  if (bus !== null) {
    return bus;
  }
  if (typeof window === "undefined") {
    return new Proxy({}, {
      get: () => {
        return () => console.error(
          "Window not available, EventBus can not be established!"
        );
      }
    });
  }
  if (window.OC?._eventBus && typeof window._nc_event_bus === "undefined") {
    console.warn(
      "found old event bus instance at OC._eventBus. Update your version!"
    );
    window._nc_event_bus = window.OC._eventBus;
  }
  if (typeof window?._nc_event_bus !== "undefined") {
    bus = new ProxyBus(window._nc_event_bus);
  } else {
    bus = window._nc_event_bus = new SimpleBus();
  }
  return bus;
}
function subscribe(name, handler) {
  getBus().subscribe(name, handler);
}
function unsubscribe(name, handler) {
  getBus().unsubscribe(name, handler);
}
function emit(name, ...event) {
  getBus().emit(name, ...event);
}
export {
  ProxyBus,
  SimpleBus,
  emit,
  subscribe,
  unsubscribe
};