async function POST(path, data={}) {
    return new Promise(function (onSuccess, onError) {
        var xhr = new XMLHttpRequest();
        xhr.open('POST', path, true);
        xhr.setRequestHeader('Content-Type', 'application/json');
        xhr.onreadystatechange = function () {
            if (xhr.readyState === 4) {
                if (xhr.status === 200) {
                    onSuccess(xhr);
                } else {
                    onError(xhr);
                }
            }
        };

        xhr.onerror = () => onError(xhr);
        xhr.send(JSON.stringify(data));
    });
}

function assert(condition, message) {
    if (!condition) {
        throw message || "Assertion failed";
    }
}


async function transmit(transmitterID, channel, action, intensity=0, lucalEncoded=false) {
    assert(typeof transmitterID === 'number');
    assert(typeof channel === 'number');
    assert(['shock', 'vibrate', 'beep'].includes(action));
    assert(typeof intensity === 'number');
    assert(typeof lucalEncoded === 'boolean');
    POST('/transmit', {transmitterID: transmitterID, channel: channel, action: action, intensity: intensity, lucalEncoded: lucalEncoded});
}

console.debug('Main loaded!');