background.js

function checkInsights(timecheck) {
	var api_url = localStorage["install_url"] + "api/v1/insight.php" + "?since=" + timecheck 
	+ "&as=" + localStorage["install_api_key"] + '&un=' + encodeURI(localStorage["email_address"]);
	//var api_url = localStorage["install_url"] + "test.json";
	console.log(Date() + " checking for new insights " + api_url);

	var xhr = new XMLHttpRequest();
	xhr.onreadystatechange = function() {
		if (xhr.readyState == 4) {
			var data = JSON.parse(xhr.responseText);
			if (typeof data.error === 'undefined') {
				if (data.length >= 3) {
 					var title = "New insights available";
					var message = "ThinkUp has " + data.length + " new insights for you.";
					var notification = window.webkitNotifications.createNotification("icon.png", title, message);
					notification.show();
				} else {
					for (var i = 0; i < data.length; i++) {
						var insight = data[i];
						var htmlstripper = document.createElement("div");
						htmlstripper.innerHTML = insight.text;
						var title = insight.prefix.replace(":","");
						var notification = window.webkitNotifications.createNotification("icon.png", title, htmlstripper.innerText);
						notification.show();
					}
				}
			} else {
				console.log('Error: ' + data.error.message);
			}
		}
	}
	xhr.open("GET", api_url, true);
	xhr.send();
	return Math.round(+new Date() / 1000);
}

// Test for notification support.
if (window.webkitNotifications) {
	var timecheck = Math.round(+new Date() / 1000);
	// While activated, show notifications at the display frequency.
	timecheck = checkInsights(timecheck);

	var interval = 5; // The polling interval, in minutes.
	var minutes_passed = 0;
	setInterval(function() {
		minutes_passed++;
		if (minutes_passed >= interval) {
			timecheck = checkInsights(timecheck);
			minutes_passed = 0;
		} else {
			console.log(Date() + ' ' + minutes_passed + ' minute(s) passed since last check, waiting to reach ' + interval);
		}
	}, 60000);
}