import _extends from "@babel/runtime/helpers/esm/extends";
import { computed } from 'vue-demi';
import { useToken } from '../theme/internal';
export const responsiveArray = ['xxxl', 'xxl', 'xl', 'lg', 'md', 'sm', 'xs'];
const getResponsiveMap = token => ({
  xs: `(max-width: ${token.screenXSMax}px)`,
  sm: `(min-width: ${token.screenSM}px)`,
  md: `(min-width: ${token.screenMD}px)`,
  lg: `(min-width: ${token.screenLG}px)`,
  xl: `(min-width: ${token.screenXL}px)`,
  xxl: `(min-width: ${token.screenXXL}px)`,
  xxxl: `{min-width: ${token.screenXXXL}px}`
});
export default function useResponsiveObserver() {
  const [, token] = useToken();
  return computed(() => {
    const responsiveMap = getResponsiveMap(token.value);
    const subscribers = new Map();
    let subUid = -1;
    let screens = {};
    return {
      matchHandlers: {},
      dispatch(pointMap) {
        screens = pointMap;
        subscribers.forEach(func => func(screens));
        return subscribers.size >= 1;
      },
      subscribe(func) {
        if (!subscribers.size) this.register();
        subUid += 1;
        subscribers.set(subUid, func);
        func(screens);
        return subUid;
      },
      unsubscribe(paramToken) {
        subscribers.delete(paramToken);
        if (!subscribers.size) this.unregister();
      },
      unregister() {
        Object.keys(responsiveMap).forEach(screen => {
          const matchMediaQuery = responsiveMap[screen];
          const handler = this.matchHandlers[matchMediaQuery];
          handler === null || handler === void 0 ? void 0 : handler.mql.removeListener(handler === null || handler === void 0 ? void 0 : handler.listener);
        });
        subscribers.clear();
      },
      register() {
        Object.keys(responsiveMap).forEach(screen => {
          const matchMediaQuery = responsiveMap[screen];
          const listener = _ref => {
            let {
              matches
            } = _ref;
            this.dispatch(_extends(_extends({}, screens), {
              [screen]: matches
            }));
          };
          const mql = window.matchMedia(matchMediaQuery);
          mql.addListener(listener);
          this.matchHandlers[matchMediaQuery] = {
            mql,
            listener
          };
          listener(mql);
        });
      },
      responsiveMap
    };
  });
}