import { queryStrings } from "@/constants/query-strings";
import { sessionStorageKeyConstants } from "@/constants/session-storage";
import {
    getFunnelCookie,
    updateOrCreateFunnelCookie,
} from "@/helpers/heritage-integration/cookie-helper";
import { loadSessionIfPresent } from "@/helpers/heritage-integration/order-helper";
import { isSavedSessionStillActive } from "@/helpers/heritage-integration/session-helper";
import analyticsMixin from "@/mixins/analytics-mixin";
import { routeData, FUNNEL_START_PAGE } from "@/router/constants/routes";
import { consumeQueryFromStash } from "@/router/methods/helpers/querystring-stash";
import { runExperiments } from "@/router/methods/helpers/run-experiments";

import { bailout } from "@/router/methods/error";
import { checkPagePrerequisites } from "@/router/methods/page-prerequisites";

export async function beforeEach(to, from) {
    try {
        await analyticsMixin.methods.validateSession();

        if (getFunnelCookie()?.SuppressConceptFunnel) {
            // Redirect to heritage.
            return {
                name: routeData.HERITAGE.name,
            };
        }

        // Ensure session has not expired
        if (getFunnelCookie() !== null && !isSavedSessionStillActive()) {
            const errorPayload = {
                cause: "expired session",
                currentPage: from?.name,
                nextPage: to?.name,
            };

            bailout(errorPayload, true);
            return false;
        }

        // Block navigation if an order has been submitted.
        if (window.sessionStorage.getItem(sessionStorageKeyConstants.SUBMITTED_STATE) !== null) {
            if (to.name !== FUNNEL_START_PAGE.name && to.name !== routeData.CONFIRMATION.name) {
                return false;
            }
        }

        // Process funnel cookie.
        updateOrCreateFunnelCookie();

        // If sent from heritage, need to load session.
        const fromHeritageFlag = consumeQueryFromStash(queryStrings.FROM_HERITAGE);
        if (fromHeritageFlag) {
            await loadSessionIfPresent(true, routeData.SERVICE_LOCATION.name);
        }

        // Ensure page-prerequisites are fulfilled
        const arePagePrerequisitesValid = await checkPagePrerequisites(to.name);

        if (!arePagePrerequisitesValid) {
            const errorPayload = {
                cause: "invalid page prerequisites for page",
                currentPage: from?.name,
                nextPage: to?.name,
            };

            bailout(errorPayload);
            return;
        }

        await runExperiments(to.name);
    } catch (error) {
        const errorPayload = {
            cause: "Uncaught exception in `beforeEach`.",
            currentPage: from?.name,
            nextPage: to?.name,
        };

        console.log(error);

        bailout(errorPayload);
        return;
    }
}