hk-bus-eta-skpracta/esm/lrtfeeder.js

Query the ETA (Estimated Time of Arrival) of HK Bus/Minibus/MTR/Lightrail (skpracta flavored)

import { isSafari } from "./utils";
export default function fetchEtas({ stopId, route, language, }) {
    return fetch(`https://rt.data.gov.hk/v1/transport/mtr/bus/getSchedule`, {
        method: "POST",
        cache: isSafari ? "default" : "no-store",
        headers: {
            "Content-Type": "application/json",
        },
        body: JSON.stringify({
            language: language,
            routeName: route,
        }),
    })
        .then((response) => response.json())
        .then(({ busStop }) => busStop
        .filter(({ busStopId }) => busStopId === stopId)
        .reduce((ret, { bus: buses }) => [
        ...ret,
        ...buses.reduce((etas, bus) => {
            // hackily use +8 hours and use UTC hour to resolve timezone issue
            const etaDate = new Date(Date.now() +
                parseInt(bus.arrivalTimeInSecond === "108000"
                    ? bus.departureTimeInSecond
                    : bus.arrivalTimeInSecond, 10) *
                    1000 +
                8 * 3600000);
            return [
                ...etas,
                {
                    eta: `${etaDate.getUTCFullYear()}-${`0${etaDate.getUTCMonth() + 1}`.slice(-2)}-${`0${etaDate.getUTCDate()}`.slice(-2)}` +
                        `T${`0${etaDate.getUTCHours()}`.slice(-2)}:${`0${etaDate.getMinutes()}`.slice(-2)}:${`0${etaDate.getSeconds()}`.slice(-2)}+08:00`,
                    remark: {
                        [language]: bus.busRemark ||
                            (bus.isScheduled === "1"
                                ? language === "en"
                                    ? "Scheduled"
                                    : "預定班次"
                                : ""),
                    },
                    dest: {
                        zh: "",
                        en: "",
                    },
                    co: "lrtfeeder",
                },
            ];
        }, []),
    ], []));
}
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