/* 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()
}

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

/* 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;
        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;
    }
}

// Build calling list:  -- This is a string if only one callingPoint is present, needs adapting to work with that
async function buildCallLists(data) {
    try { /* Check if previous calling points exist */
        if (data.previousCallingPoints.callingPointList.callingPoint) {
            var preCallPoint = data.previousCallingPoints.callingPointList.callingPoint;
        }
    } catch (err) { /* Log if ERR */
        log(`Error reading previous calling points: ${err}`, "INFO")
    }
    try { /* Check if subsequent calling points exist */
        if (data.subsequentCallingPoints.callingPointList.callingPoint) {
            var postCallPoint = data.subsequentCallingPoints.callingPointList.callingPoint;
        }
    } catch (err) { /* Log if ERR */
        log(`Error reading future calling points: ${err}`, "INFO")
    }
    var procPre = "";
    var procPost = "";
    try {
        if (preCallPoint) {
            for(var i = 0; i < preCallPoint.length; i++) {
                var proc = await buildCalls(preCallPoint[i]);
                procPre = `${procPre}\n${proc}`
            }
        }
    } catch (err) {
        console.log(`Error reading previous stops. ${err}`)
    }
    try {
        if (postCallPoint) {
            for (var i = 0; i < postCallPoint.length; i++) {
                var proc = await buildCalls(postCallPoint[i]);
                procPost = `${procPost}\n${proc}`
            }
        }
    } catch (err) {
        console.log(`Error reading next stops. ${err}`)
    }
    var div = `
            <div class="call-data" id="${data.serviceID}">
              <p class="close-data" onclick="hideCalls('${data.serviceID}')">X</p>
              <table class="calling-at">
                <caption>Calling at:</caption>
                <tr>
                  <th class="detail-name-head">Location</th>
                  <th class="time">Schedule</th>
                  <th class="time">Exp.</th>
                </tr>
                ${procPost}
              </table>
              <table class="called-at">
                <caption>Previous stops:</caption>
                <tr>
                  <th class="detail-name-head">Location</th>
                  <th class="time">Schedule</th>
                  <th class="time">Actual</th>
                </tr>
                ${procPre}
              </table>
            </div>`
    document.body.insertAdjacentHTML("beforeend", div)
    return;
}

// Display calling list: - The calling list should be built on demand.
async function showCalls(id) {
    document.getElementById(id).style = "display: block;";
    return;
}

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

// 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>`;
    }
    document.getElementById("alerts_msg").insertAdjacentHTML("beforeend", messages);
    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`

    }
    document.getElementById("alerts").style = "display:block"
    document.getElementById("alerts_bar").style = "display:block"
    document.getElementById("output").style = "margin-top:95px" /* The margin for the train table needs to be adjusted if the alert box exists. */
}


/* 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()")
}


/* Builds the train data information in to a table row */
async function buildCalls(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>`
}