"use strict";

const TARINAI_PUBLIC_EVENT_TYPES = new Set(["audio:play", "selection:changed", "tool:selected", "world:phase", "log:entry", "tool:placed"]);

class TarinaiEventBus {
  constructor() {
    this.handlers = new Map();
  }

  on(type, handler) {
    if (!type || typeof handler !== "function") return;
    let list = this.handlers.get(type);
    if (!list) {
      list = new Set();
      this.handlers.set(type, list);
    }
    list.add(handler);
  }

  hasDirectListeners(type) {
    if (!type) return false;
    return Boolean(this.handlers.get(type)?.size || 0);
  }

  hasWildcardListeners(type) {
    if (!type || !TARINAI_PUBLIC_EVENT_TYPES.has(String(type))) return false;
    return Boolean(this.handlers.get("*")?.size || 0);
  }

  hasListeners(type) {
    if (!type) return false;
    return Boolean(this.hasDirectListeners(type) || this.hasWildcardListeners(type));
  }

  emit(type, detail = {}) {
    if (!type) return null;
    const direct = this.handlers.get(type);
    const wildcard = TARINAI_PUBLIC_EVENT_TYPES.has(String(type)) ? this.handlers.get("*") : null;
    if (!(direct?.size || 0) && !(wildcard?.size || 0)) return null;
    const event = { type, detail: detail || {}, at: performance?.now?.() ?? Date.now() };
    if (direct) for (const handler of [...direct]) this.safeCall(handler, event);
    if (wildcard) for (const handler of [...wildcard]) this.safeCall(handler, event);
    return event;
  }

  safeCall(handler, event) {
    try { handler(event); }
    catch (err) { console.error("event handler failed", event.type, err); }
  }
}

window.TarinaiEvents = window.TarinaiEvents || new TarinaiEventBus();