// make ajax request object
function createRequestObject() 
{
	var requestObject;
	var browser = navigator.appName;
	
	if (browser == "Microsoft Internet Explorer") {
	requestObject = new ActiveXObject("Microsoft.XMLHTTP");
	} else {
	requestObject = new XMLHttpRequest();
	}
	return requestObject;
}

// declare a variable for the request object
var http = createRequestObject();
var distance,mileage,directions,state;
var tooFar = 0;
var invalidZip = 0;
var cost = 0;

// send the zipcode
function getMileage()
{
var zipcode = document.getElementById('zipcode').value;
if (zipcode > 0 && zipcode.match(/^\d{5}$/)) {
    toggleSubmit("off");

    if (GBrowserIsCompatible()) {
        getState(zipcode);
        // setup distance query from google api
        directions = new GDirections();
        directions.load('17603 to ' + document.getElementById('zipcode').value);
        if (navigator.userAgent.indexOf("Opera") != -1) {
            GEvent.addListener(directions, "load", getMileagePrice());
            } else {
            GEvent.addListener(directions, "load", getMileagePrice);
            }
    } else {
        alert ("Your web browser is incompatible with this website! \nPlease upgrade to one of: \nFirefox 1 or newer \nInternet Explorer 6 or newer \nSafari 3 or newer \nOpera 9 or newer");
    }
} else {
getAPrice();
}
}

// toggles submit button
function toggleSubmit(action)
{
switch(action) {
    case "on":
    document.getElementById('submitButton').disabled = false;
    break;
    
    case "off":
    document.getElementById('submitButton').disabled = true;
    break;
    
    default:
    alert ("Action: " + action + " is not a valid action");
    break;
    }
}

function getMileagePrice()
{

// disable submit button so the impatient don't cause problems
// need a way to timeout the google query in case we have connection problems
toggleSubmit("off");

distance = directions.getDistance().meters;
var miles = distance / 1609.344;
miles = miles.toFixed(0);


// if less than 400 miles, we're good to go 
if (miles <= 400 ) {
	// get a charged shipping distance
	if (miles - 20 < 0) {
		var mileage = 0;
		}
	else {
		var mileage = miles - 20;
		}
	// calculate the cost
	if (Number(Shed.Shed_width) >= Number(Shed.Shed_depth)) {
		var size = Shed.Shed_depth;
		} else {
		var size = Shed.Shed_width;
		}
	if (size < 10 || document.getElementById('kit').checked == true || document.getElementById('build').checked == true) {
		cost = 3.35 * mileage;
		} else {
		cost = (3.5 * mileage) + 25;
		if (state != "PA") {
			cost += 50;
			}
		if (state == "VA" || state == "WV" || state == "CT" || state == "VT" || state == "MA" || state == "KY" ) {
			cost = cost + 50;
			}
		if (state == "RI" || state == "NH" || state == "NC" || state == "TN") {
			cost = cost + 50 * 2;
			}
		if (state == "ME" || state == "SC") {
			cost += 50 * 3;
			}
		}
	document.getElementById('message').innerHTML = "You are " + miles + " miles away, and it will cost $" + cost.toFixed(2) + " to ship your shed";
	invalidZip = 0;
	tooFar = 0;
	getAPrice();
	GUnload();
// need to enable the submit button once again
        toggleSubmit("on");
	}
	// if it's too far away...
	else if (miles > 400) {
	tooFar = 1;
	invalidZip = 0;
	document.getElementById('message').innerHTML = "Sorry, you live too far away for us to ship to you";
	GUnload();
	// we have an error otherwise
	} else {
	tooFar = 0;
	invalidZip = 1;
	document.getElementById('message').innerHTML = "Please place a valid zip code in the above field."
	GUnload();
	}
}
	
function getState(zip)
{
http.open("get", "./includes/getState.php?zip=" + zip, true);
http.onreadystatechange = handleState;
http.send(null);
}

function handleState()
{
if (http.readyState == "4") {
	var response = http.responseText;
	if (response == "error") {
		document.getElementById('message').innerHTML = "Sorry, there was an error in the calculations. Make sure that you are putting a five digit zip code in the above box.";
		tooFar = 0;
		invalidZip = 1;
		} else {
		state = response;
		getAPrice();

		}
	}
} // end handleState