function updateFrontend(values) {
    values.duration = moment.duration(values.duration)                  // Create moment object from ISO 8601 string
    values.durationLeft = moment.duration(values.durationLeft)          // Create moment object from ISO 8601 string
    document.getElementById("durationLeft").innerHTML = values.print    // Display durationLeft as prettyfied string

    if(values.isPaused) {                                               // Set button state depending on timer status
        document.getElementById("timerStartBtn").disabled = false
        document.getElementById("timerPauseBtn").disabled = true
    } else {
        document.getElementById("timerStartBtn").disabled = true
        document.getElementById("timerPauseBtn").disabled = false
    }
}

async function initialUpdate() {
    const response = await fetch("/admin/timerGetValues");  // Call API Endpoint /admin/timerGetValues
    const data = await response.json();                     // Wait for asyncronous transfer to complete and parse json (which got received by backend)
    console.log(data);                                      // Print received data
    updateFrontend(data);                                   // Update admin frontend with received values
}

// Timerfunctions
async function timerStart() {
    const response = await fetch("/admin/timerStart");      // Call API Endpoint /admin/timerStart
    if(response.status == 200) {
        const data = await response.json();                 // Wait for asyncronous transfer to complete and parse json (which got received by backend)
        console.log(data);                                  // Print received data
        updateFrontend(data);                               // Update admin frontend with received values
    } else {
        //console.log("Error, Timer bereits abgelaufen: ", response.status);
        const timerStartErrorToast = bootstrap.Toast.getOrCreateInstance(document.getElementById("timerStartErrorToast"));  // Create toast instance byId timerStartErrorToast
        timerStartErrorToast.show();                        // Show error toast
    }
}

async function timerPause() {
    const response = await fetch("/admin/timerPause");      // Call API Endpoint /admin/timerStart
    if(response.status == 200) {
        const data = await response.json();                 // Wait for asyncronous transfer to complete and parse json (which got received by backend)
        console.log(data);                                  // Print received data
        updateFrontend(data);                               // Update admin frontend with received values
    } else {
        //console.log("Error, Timer bereits pausiert: ", response.status);
        const timerPauseErrorToast = bootstrap.Toast.getOrCreateInstance(document.getElementById("timerPauseErrorToast"));  // Create toast instance byId timerStartErrorToast
        timerPauseErrorToast.show();                        // Show error toast
    }
}

async function timerReset() {
    let newDuration = document.getElementById("timerSelectDuration").value;
    const response = await fetch("/admin/timerReset", {     // Call API Endpoint /admin/timerStart with selected new duration in seconds
        method: 'POST',
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({duration: newDuration})
    });
    const data = await response.json();                     // Wait for asyncronous transfer to complete and parse json (which got received by backend)
    console.log(data);                                      // Print received data
    updateFrontend(data);                                   // Update admin frontend with received values
}

// Scoreboardfunctions
async function scoreSwitch() {
    const response = await fetch("/admin/scoreSwitch");     // Call API Endpoint /admin/timerStart
    const data = await response.json();                     // Wait for asyncronous transfer to complete and parse json (which got received by backend)
    console.log(data);                                      // Print received data
}