problematic use of firebase api

watchPosition(agent) NEW

function watchPosition(agent) {
	agent.dataRef.child("coords").once("value", function(coords) {
		if (coords.val()) {
			console.log("Has coords!");

			agent.dataRef.child("coords").on("value", function(coords) {
				var lat = coords.child("lat").val();
				var lon = coords.child("lon").val();
				var patch = getPatchAt(lat, lon, 3);
				if (patch) agent.setData("patch", patch.url);
				else agent.setData("patch", null);
			});
		}
		else {
			console.log("Has no coords! Has lat and lon!");

			agent.dataRef.child("lat").on("value", function(latSnapshot) {
				var lat = latSnapshot.val();
				var lon = agent.data.lon;
				var patch = getPatchAt(lat, lon, 3);
				if (patch) agent.setData("patch", patch.url);
				else agent.setData("patch", null);
			});
			agent.dataRef.child("lon").on("value", function(lonSnapshot) {
				var lat = agent.data.lat;
				var lon = lonSnapshot.val();
				var patch = getPatchAt(lat, lon, 3);
				if (patch) agent.setData("patch", patch.url);
				else agent.setData("patch", null);
			});
		}
	});
}

watchPosition(agent) OLD

function watchPosition(agent) {
	agent.dataRef.child("coords").on("value", function(coords) {
		if (coords.val()) {
			var lat = coords.child("lat").val();
			var lon = coords.child("lon").val();
			var patch = getPatchAt(lat, lon, 3);
			if (patch) agent.setData("patch", patch.url);
			else agent.setData("patch", null);
		}
		else {
			console.log("Has no coords!")
			agent.dataRef.child("lat").on("value", function(latSnapshot) {
				if (latSnapshot.val()) {
					var lat = latSnapshot.val();
					var lon = agent.data.lon;
					var patch = getPatchAt(lat, lon, 3);
					if (patch) agent.setData("patch", patch.url);
					else agent.setData("patch", null);
				}
			});
			agent.dataRef.child("lon").on("value", function(lonSnapshot) {
				if (lonSnapshot.val()) {
					var lat = agent.data.lat;
					var lon = lonSnapshot.val();
					var patch = getPatchAt(lat, lon, 3);
					if (patch) agent.setData("patch", patch.url);
					else agent.setData("patch", null);
				}
			});
		}
	});
}