function solve() {
    const BASE_URL = "http://localhost:3030/jsonstore/bus/schedule/"
    let id = "depot"

    let departBtn = document.getElementById("depart")
    let arriveBtn = document.getElementById("arrive")
    let infoSpan = document.querySelector("#info > span")
    let currentStopName = null

    function depart() {
        departBtn.disabled = true
        arriveBtn.disabled = false

        fetch(`${BASE_URL}`)

        .then((res) => res.json())
        .then((data) => {

            let currentStop = data[id]

            infoSpan.textContent = `Next stop ${currentStop.name}`
            currentStopName = currentStop.name

            id = currentStop.next
            currentStop = data[id]
        })
    }

    async function arrive() {
        departBtn.disabled = false
        arriveBtn.disabled = true
        infoSpan.textContent = `Arriving at ${currentStopName}`
    }

    return {
        depart,
        arrive
    };
}

let result = solve();