import { RouteLocationNormalizedGeneric, Router } from "vue-router";

export default {
  install(app, router: Router) {
    var routes: RouteLocationNormalizedGeneric[] = [];
    var nextRoutes: RouteLocationNormalizedGeneric[] | null = null;
    var zeroIndex: number | undefined = undefined;

    router.beforeResolve((to, ignoredfrom, next) => {
      if (!zeroIndex) {
        routes = [to];
        zeroIndex = window.history.length;
      }
      next();
    });

    router.beforeEach((to, from, next) => {
      if (nextRoutes) {
        console.log("Nav: next routes set, going:", routes, nextRoutes);
        routes = nextRoutes;
        nextRoutes = null;
        if (routes.length > 0) {
          console.log("Redirecting to", routes[routes.length - 1]);
          next(routes[routes.length - 1]);
          return;
        }
      }
      next();
    });

    const navigationService = {
      /***
       * @param mode Mode of operation. -1 = push as root, 0 = replace, 1 = normal push
       */
      push(route, mode) {
        if (mode === undefined) {
          mode = 1;
        }
        if (mode == -1) {
          nextRoutes = [route];
        } else if (mode == 0) {
          // Replace
          nextRoutes = [...routes];
          nextRoutes.pop();
          nextRoutes.push(route);
        } else {
          nextRoutes = [...routes];
          nextRoutes.push(route);
        }

        const index = nextRoutes.length - routes.length;
        const targetIndex = nextRoutes.length - 1;
        console.log("Nav - index " + index + " Target " + targetIndex);
        if (index < 0) {
          console.log("Nav - go " + index);
          router.go(index);
        } else if (index == 0) {
          console.log("Nav - replace");
          routes = nextRoutes;
          nextRoutes = null;
          router.replace(route).catch((ignoredErr) => {});
        } else {
          console.log("Nav - push");
          router.push(route).catch((ignoredErr) => {});
        }
      },

      canPop() {
        if (nextRoutes) {
          return nextRoutes.length > 1;
        }
        return routes.length > 1;
      },

      pop() {
        routes.pop();
        router.go(-1);
      },
    };

    app.$navigation = navigationService;
    app.provide("globalNavigation", navigationService);
    app.config.globalProperties.$navigation = navigationService;
  },
};