var xhrRequest = function (url, type, callback) {
    var xhr = new XMLHttpRequest();
    xhr.onload = function () {
        callback(this.responseText);
    };
    xhr.open(type, url);
    xhr.send();
};

function locationSuccess(pos) {
    var url = 'https://api.open-meteo.com/v1/forecast?' +
        'latitude=' + pos.coords.latitude +
        '&longitude=' + pos.coords.longitude +
        '&current=temperature_2m';

    xhrRequest(url, 'GET',
        function (responseText) {
            var json = JSON.parse(responseText);

            // clamp into a range of 80 (technically 81)C (-32,48), -32C=-25.6F, 48C=118.4F
            var temperature = Math.min(Math.max(json.current.temperature_2m, -32), 48);
            // set set range minimum to 0 (add 32) and convert to bars (0-20)
            temperature = Math.round((temperature + 32) / 4);

            Pebble.sendAppMessage({ PKJS_TEMP_BAR_COUNT: temperature });
        }
    );
}

function getWeather() {
    navigator.geolocation.getCurrentPosition(
        locationSuccess,
        null,
        { timeout: 15000, maximumAge: 60000 }
    );
}

Pebble.addEventListener("appmessage", function (dict) {
    if (dict.payload["PKJS_TEMP_BAR_COUNT"]) {
        getWeather();
    }
});