// Shamelessly stolen from
// https://developer.mozilla.org/en-US/docs/Web/HTTP/Browser_detection_using_the_user_agent#mobile_device_detection

let hasTouchScreen = false;
if ("maxTouchPoints" in navigator) {
    hasTouchScreen = navigator.maxTouchPoints > 0;
} else if ("msMaxTouchPoints" in navigator) {
    hasTouchScreen = navigator.msMaxTouchPoints > 0;
} else {
    const mQ = matchMedia?.("(pointer:coarse)");
    if (mQ?.media === "(pointer:coarse)") {
        hasTouchScreen = !!mQ.matches;
    } else if ("orientation" in window) {
        hasTouchScreen = true; // deprecated, but good fallback
    } else {
        // Only as a last resort, fall back to user agent sniffing
        const UA = navigator.userAgent;
        hasTouchScreen =
            /\b(BlackBerry|webOS|iPhone|IEMobile)\b/i.test(UA) ||
            /\b(Android|Windows Phone|iPad|iPod)\b/i.test(UA);
    }
}

module.exports = hasTouchScreen;