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// run this in the console
// call copyAttendanceListToClipboard() in the console to get the list.


function initializeAttendanceList() {
    window.attendanceMap = new Map();
}

function computeParticipants() {
    var elements = document.querySelectorAll("div[data-self-name]");
    for (var item of elements) {
        var name = item.innerHTML;
        if (name != "You" && !window.attendanceMap.has(name)) {
            var now = new Date().toLocaleTimeString([], { hour: '2-digit', minute: "2-digit", hour12: false });
            window.attendanceMap.set (name, now);
            console.log ("Attendance: " + name + " joined at " + now);
        }
    }
    return window.attendanceMap;
}

function abortGetAttendance() {
    if (window.attendanceListTimer) {
        clearInterval(window.attendanceListTimer);
        console.log ("Attendance timer killed");
    }
    window.attendanceListTimer = null;
}

function startComputeAttendance() {
    if (window.attendanceListTimer) {
        abortGetAttendance();
    }
    computeParticipants();
    window.attendanceListTimer = setInterval (computeParticipants, 15000);
    console.log ("Attendance timer started");
}

function renderAttendanceList() {
    var attendanceList = "";
    for (var item of window.attendanceMap) {
        attendanceList += item[1] + "\t" + item[0] + "\n";
    };
    return attendanceList;
}

function copyAttendanceListToClipboard () {
    navigator.clipboard.writeText(renderAttendanceList());
    alert("Attendance list copied to the clipboard");
}

initializeAttendanceList();
startComputeAttendance();