import { createWebHistory, createRouter } from "vue-router";
import { lazyLoadComponent } from "@/router/dynamic-routing/component-loader";
import {issPageValues} from '@/router/router-constants/issPage-values';
import { routingTable } from "@/router/router-constants/routing-table";
import { useMainStore } from '@/store';
import eventBus from "@/helpers/event-bus/event-bus";
import { globalEvents, globalEventTypes } from "@/constants/events";

import analyticsMixin from "@/mixins/analytics-mixin";

const routes = [
    {
        path: '/',
        name: 'root',
        async beforeEnter(to, from, next) {
            try {                
                to.query.issPage = !to.query.issPage ? issPageValues.VEHICLE_YEAR : to.query.issPage;

                if (router.hasRoute(to.query.issPage)) {
                    return next({ name: to.query.issPage, query: to.query, params: to.params });
                }

                const routeData = await GetRouteInfoFromPageName(to.query.issPage);

                if(routeData[0].name.toLowerCase() === "error")
                {
                    throw("Page not found!");
                }

                // Add our dynamic route.
                router.addRoute({
                    path: routeData[0].path, // Always the same path, because we control it with query strings.
                    name: routeData[0].name,
                    component: routeData[0].component,
                });

                // Assign current query string parameters, as well as our issPage one.
                next({
                    name: routeData[0].name,
                    query: Object.assign(to.query, { issPage: routeData[0].name }),
                    params: to.params
                });

            } catch (error) {
                console.log(error);
                GoToStartOn404(next);
            }
        }
    }];

const router = createRouter({
    history: createWebHistory("/"),
    routes,
});

router.afterEach((to, from) => {    

    const store = useMainStore();
    // Update lastPageVisited in the store
    store.updateLastPageVisited(to.name);

    // Push page view to GA
    analyticsMixin.methods.pushPageViewToGA();

    // Push experiments to Data Layer
    analyticsMixin.methods.pushExperimentsToDataLayer();
});

// Get route information by page name.
// This will reach out to the Cms and there is a 1:1 relationship between page names and route names.
async function GetRouteInfoFromPageName(pageName) {
    
    const response = await useMainStore().getRouteInfo(pageName);

    const jsonFromResponse = JSON.parse(response.data.Result);
    let routeData = [];
  
    // Add our route data and return our array.
    Object.keys(jsonFromResponse).forEach((key) => {
      routeData.push({
        path: "/",
        name: `${key}`,
        component: lazyLoadComponent(jsonFromResponse[key].LayoutName),
      });
    });

    return routeData;
};

router.navigate = (scenario, currentRoute, optionalQuery = {}, optionalParams = {}) => {

    navigate(scenario, currentRoute, false, optionalQuery, optionalParams);
  
  }

// Navigate to the next route, depending on the scenario.
function navigate (scenario, currentRoute, optionalQuery = {}, optionalParams = {}) {
    if (!scenario) {
        console.error("No scenario provided. Please review the routing table.");
        return;
    }

    // Match our maps up and navigate if we have a destination.
    const matchingScenarioMap = getNavigationMap(scenario, currentRoute);

    if (!matchingScenarioMap){
        console.error("No matching scenario found. Please review the routing table.");
        return;        
    } 

    if (matchingScenarioMap.destinationIssPageValue) {
        // We're always pushing the same path, just changing query strings. Make sure our optional query strings get combined with our issPage one.
        router.push({
            name: "root",
            query: Object.assign(optionalQuery, {
                issPage: matchingScenarioMap.destinationIssPageValue,
            }),
            params: optionalParams
        });
    } else if (matchingScenarioMap.destinationUrl) {
        navigateToUrl(matchingScenarioMap.destinationUrl, optionalQuery);
    }
};

// Navigate to an external url.
function navigateToUrl(url, optionalQuery = {}) {
    // possibly show some loading screen in the future here.
    let externalUrl = new URL(url);
  
    for (const queryKey in optionalQuery) {
      externalUrl.searchParams.append(queryKey, optionalQuery[queryKey]);
    }
    
    window.location.assign(externalUrl);
};

// Get navigation map depending on the scenario and the current 'page' you're on.
function getNavigationMap (scenario, currentRoute) {
    const issPageValue = currentRoute.query.issPage;
    try {

        const matchedQueryValue = routingTable(useMainStore())
        .filter(
            (item) =>
                item.issPageValue === issPageValue &&
                item.maps.filter((map) => map.scenario === scenario).length > 0
        );

        let maps = matchedQueryValue ? matchedQueryValue.map((m) => m.maps.filter((map) => map.scenario === scenario))[0] : undefined;
        
        return maps ? maps.filter(x => x.filter === true || x.filter === undefined)[0] : undefined;
    }
    catch (e) {
        console.error(e);
        return undefined;
    }
   
};

function GoToStartOn404(next) {
    const errorPageName = issPageValues.VEHICLE_YEAR;
    router.addRoute({
        path: "/",
        name: errorPageName,
        component: lazyLoadComponent(errorPageName),
    });

    // Put item on the bus
    eventBus.addEventToBus(
        globalEvents.Categories.GLOBAL_ALERT,
        globalEvents.SubCategories.PAGE_NOT_FOUND,
        {
            isDismissible: true,
            messageCopy: "You can get a quote by starting on this page.",
            messageHeadline: "We're sorry, something went wrong.",
            type: globalEventTypes.Danger,
        }
    );

    next({
        name: errorPageName,
        query: {issPage: errorPageName },
    });

};

export default router;