/* Fetch Functions */
async function publicLdb(stn) {
    var url = `${window.location.origin}/api/v1/ldb/${stn}`;
    var resp = await fetch(url);
    return await resp.json();
}

/* Set page heading */
async function setHeaders(title,time) {
    var prefix = `OwlBoard - `
    document.title = `${prefix}${title}`
    document.getElementById("stn_name").textContent = title
    document.getElementById("fetch_time").textContent = time.toLocaleTimeString()
    sessionStorage.setItem("board_location", title);
}

/* Display No Trains Message */
async function displayNoTrains() {
    log("No Trains", "WARN")
    document.getElementById('no_services').style = "display: block;";
    hideLoading();
}

/* Parse the value of `platform` to account for unknown platforms */
async function parsePlatform(svc){
    if (svc.platform != undefined) {
        var platform = svc.platform;
    } else {
        var platform = "-";
    }
    if (svc.platformChanged) { // Not present in public API, ready for staff version.
        var changed = "changed";
    } else {
        var changed = "";
    }
    return {num: platform, change: changed}
}


/* Change value of time strings to fit well on small screens */
async function parseTime(string){
    switch (string) {
        case "Delayed":
            var output = "LATE";
            var change = "changed";
            break;
        case "Cancelled":
            var output = "CANC";
            var change = "cancelled";
            break;
        case "On time":
            var output = "RT";
            var change = "";
            break;
        case "":
            var output = "-";
            var change = "";
            break;
        case undefined:
            var output = "-";
            var change = "";
            break;
        case "No report":
            var output = "-";
            var change = "";
            break;
        case "undefined":
            var output = false;
            var change = "";
            break;
        default:
            var output = string;
            var change = "changed";
    }
    return {data: output, changed: change};
}

/* Convert multiple Origin/Destinations to single string */
async function parseName(location) {
    if (Array.isArray(location)) {
        var name = `${location[0]['locationName']} & ${location[1]['locationName']}`
        return name;
    }
    else {
        return location.locationName;
    }
}

// Display Alert Messages
async function displayAlerts(array) {
    var counter = 0
    var messages = ""
    for(var i = 0; i < array.length; i++) {
        // Increment counter
        counter += 1;
        // Reset Vars
        messages += `<p>${array[i]}</p>`;
    }
    if (counter > 0) {
        document.getElementById("alerts_msg").insertAdjacentHTML("beforeend", messages)
        document.getElementById("alerts").style = "display:block"
        document.getElementById("alerts_bar").style = "display:block"
        if (counter == 1) {
            document.getElementById("alert_bar_note").textContent = `There is ${counter} active alert`
        } else if (counter > 1) {
            document.getElementById("alert_bar_note").textContent = `There are ${counter} active alerts`
        }
        return true;
    }
    return false;
}


/* Show/Hide alerts box */
async function inflateAlerts() {
    document.getElementById("alerts_msg").style = "display:block;";
    document.getElementById("alert_expand_arrow").style = "transform: rotate(180deg);";
    document.getElementById("alerts_bar").setAttribute("onclick", "deflateAlerts()")
}

async function deflateAlerts() {
    document.getElementById("alerts_msg").style = "display.none;";
    document.getElementById("alert_expand_arrow").style = "transform: rotate(0deg);";
    document.getElementById("alerts_bar").setAttribute("onclick", "inflateAlerts()")
}

/*//// SERVICE DETAIL LISTS ////*/
// Build calling list:  -- This outputs calling point data to sessionStorage in the format: key{pre: [{PREVIOUS_Stops}], post: [{POST_STOPS}]}
async function buildCallLists(svc) {
    var sSvcId = svc.serviceID;
    var oSvcData = {
        plat: svc.platform,
        sta: svc.sta,
        eta: svc.eta,
        std: svc.std,
        etd: svc.etd
    };
    try {
        if (typeof svc.previousCallingPoints.callingPointList.callingPoint != 'undefined') {
            let array = await makeArray(svc.previousCallingPoints.callingPointList.callingPoint);
            oSvcData.pre = array;
        }
    } catch (err) { /* Do nothing if ERR */ }
    try {
        if (typeof svc.subsequentCallingPoints.callingPointList.callingPoint != 'undefined') {
            let array = await makeArray(svc.subsequentCallingPoints.callingPointList.callingPoint);
            oSvcData.post = array;
        }
    } catch (err) { /* Do nothing if ERR */ }
    sessionStorage.setItem(sSvcId, JSON.stringify(oSvcData))
}

/* Display calling list: - Read data from sessionStorage and write to DOM. */
async function showCalls(id) {
    log(`Showing details for service ${id}`, "INFO")
    var svcDetail = await JSON.parse(sessionStorage.getItem(id));
    var pre = "";
    var post = "";
    if (typeof svcDetail.pre != 'undefined') {
        for(var preCall = 0; preCall < svcDetail.pre.length; preCall++) {
            pre += await singleCall(svcDetail.pre[preCall]);
        }
    }
    if (typeof svcDetail.post != 'undefined') {
        for(var postCall = 0; postCall < svcDetail.post.length; postCall++) {
            post += await singleCall(svcDetail.post[postCall]);
        }
    }
    /* Run retreived data through parsers */
    var thisStd = await parseTime(svcDetail.std);
    var thisEtd = await parseTime(svcDetail.etd);
    var thisSta = await parseTime(svcDetail.sta);
    var thisEta = await parseTime(svcDetail.eta);
    /* Prepare data for this station */
    if (thisStd.data != "-") {
        var sTime = `${thisStd.data}`
        var eTime = `${thisEtd.data}`
        var change = thisEtd.changed
    } else {
        var sTime = `${thisSta.data}`
        var eTime = `${thisEta.data}`
        var change = thisEta.changed
    };

    let here = `<tr>
                  <td class="detail-name detail-name-here detail-table-content">${sessionStorage.getItem("board_location")}</td>
                  <td class="detail-table-content">${sTime}</td>
                  <td class="detail-table-content ${change}">${eTime}</td>
                </tr> `
    /* Prepare then insert DOM Data */
    let dom = ` <div id="${id}" class="call-data">
                  <p class="close-data" onclick="hideCalls('${id}')">X</p>
                  <table class="call-table">
                    <tr>
                      <th class="detail-name-head">Location</th>
                      <th class="time">Schedule</th>
                      <th class="time">Act/Est</th>
                    </tr>
                    ${pre}
                    ${here}
                    ${post}
                  </table>
                </div>`

    document.body.insertAdjacentHTML("beforeend", dom);
    document.getElementById(id).style = "display: block;";
    return;
}

async function hideCalls(id) {
    let element = document.getElementById(id)
    element.style = "display: none;";
    element.remove();
    return;
}

/* Builds the train data information in to a table row */
async function singleCall(data) {
    if (typeof data.et != "undefined") {
        var time = await parseTime(data.et)
    } else if (typeof data.at != "undefined") {
        var time = await parseTime(data.at)
    }
    return `<tr>
              <td class="detail-name detail-table-content">${data.locationName}</td>
              <td class="detail-table-content">${data.st}</td>
              <td class="detail-table-content ${time.changed}">${time.data}</td>
            </tr>`
}

/* Error Handler */
async function errorHandler() {
    if (sessionStorage.getItem("failcount")) {
        var errCount = parseInt(sessionStorage.getItem("failcount"))
    } else {
        var errCount = 0;
    }
    errCount += 1;
    sessionStorage.setItem("failcount", errCount.toString())
    if (errCount < 10){
        await delay(3000);
        vibe("err")
        location.reload()
    } else {
        sessionStorage.removeItem("failcount");
        window.location.assign("conn-err.html")
    }
}