hk-bus-eta/esm/lightRail.js

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

import { isSafari } from "./utils";
export default function fetchEtas({ stopId, route, dest, }) {
    return fetch(`https://rt.data.gov.hk/v1/transport/mtr/lrt/getSchedule?station_id=${stopId.slice(2)}&with_special=1`, {
        cache: isSafari ? "default" : "no-store",
    })
        .then((response) => response.json())
        .then(({ platform_list }) => {
        if (platform_list.every(({ end_service_status }) => end_service_status)) {
            return [
                {
                    eta: "",
                    remark: {
                        zh: "此站今日服務已經終止",
                        en: "This stop's service for today has ended",
                    },
                    dest: {
                        zh: "",
                        en: "",
                    },
                    co: "lightRail",
                },
            ];
        }
        return platform_list.reduce((acc, { route_list, platform_id }) => {
            return [
                ...acc,
                ...(route_list !== null && route_list !== void 0 ? route_list : [])
                    .filter(({ route_no, additionalInfo1, dest_ch, dest_en, stop, }) => 
                // match route number OR additionalInfo1 to the requested route
                (route === route_no || route === additionalInfo1) &&
                    (dest_ch === dest.zh || dest_en.includes("Circular")) &&
                    stop === 0)
                    .map(({ time_en, train_length, routeRemarkEng2, routeRemarkChi2, }) => {
                    let waitTime = 0;
                    switch (time_en.toLowerCase()) {
                        case "arriving":
                        case "departing":
                        case "-":
                            waitTime = 0;
                            break;
                        default:
                            waitTime = parseInt(time_en, 10);
                            break;
                    }
                    const etaDate = new Date(Date.now() + waitTime * 60 * 1000 + 8 * 3600000);
                    const platformText = `${platform_id}號月台 - ${Array(train_length)
                        .fill("▭")
                        .join("")}`;
                    const platformTextEn = `Platform ${platform_id} - ${Array(train_length)
                        .fill("▭")
                        .join("")}`;
                    // Append routeRemarkEng2 / routeRemarkChi2 if present
                    const remarkZh = routeRemarkChi2
                        ? `${platformText} - ${routeRemarkChi2}`
                        : platformText;
                    const remarkEn = routeRemarkEng2
                        ? `${platformTextEn} - ${routeRemarkEng2}`
                        : platformTextEn;
                    return {
                        eta: `${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: {
                            zh: remarkZh,
                            en: remarkEn,
                        },
                        dest: {
                            zh: "",
                            en: "",
                        },
                        co: "lightRail",
                    };
                }),
            ];
        }, []);
    })
        .catch((e) => {
        console.error(e);
        return [];
    });
}
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