import type { EventBusHandler } from '~/extends/EventBusExtend'

/**
 * 事件总线组合式封装
 * 在组件作用域内订阅时会自动解绑
 */
export const useEventBus = () => {
  const registerDispose = (unsubscribe: () => void) => {
    if (getCurrentScope()) {
      onScopeDispose(unsubscribe)
    }

    return unsubscribe
  }

  const on = <T = unknown>(event: string, handler: EventBusHandler<T>) => {
    return registerDispose(EventBusExtend.on(event, handler))
  }

  const off = <T = unknown>(event: string, handler?: EventBusHandler<T>) => {
    EventBusExtend.off(event, handler)
  }

  const emit = <T = unknown>(event: string, payload?: T) => {
    EventBusExtend.emit(event, payload)
  }

  return {
    on,
    off,
    emit,
    clear: EventBusExtend.clear
  }
}