// Document Ready page init function
var debug = false;
var DFLT_RESTAURANT = 'Any';
function initAppMenus() {
	// Check if the request came in from a particular job posting
	if(!prefillMenus())
	{
		// Otherwise disable sub-menus and load restaurants:
		$("#locationSelect").attr("disabled","disabled");
		$("#positionSelect").attr("disabled","disabled");
		// Load the restaurant menu
		appendOptions(getRestaurantNames(), '#restaurantSelect', true);
	}
	// restaurantSelect
	$("#restaurantSelect").change(function()
	{
		var val = this.options[this.selectedIndex].value;
		if(val != null && val != '')
		{
			// update sub-menu
			appendOptions(getLocationNames(val), '#locationSelect', true);
			
			// Enable the  location menu
			$("#locationSelect").removeAttr("disabled");
			// Disable the position menu
			$("#positionSelect").attr("disabled","disabled");
			$("#Restaurant").val(val);
		}
		else
		{
			// Disable the sub-menus
			clearOptions("#locationSelect");
			clearOptions("#positionSelect");
			$("#positionPhone").val('');
			$("#positionAddress").val('');
			$("#locationSelect").attr("disabled","disabled");
			$("#positionSelect").attr("disabled","disabled");
			$("#Restaurant").val('');
		}
		$("#Location").val('');
		$("#JobTitle").val('');
	});
	
	// locationSelect
	$("#locationSelect").change(function()
	{
		var val = this.options[this.selectedIndex].value;
		if(val != null && val != '')
		{
			log("Selected Location: '" + val + "'");			
			fillContactInfo($('#restaurantSelect option:selected').val(), val);
			
			// Enable the sub-menu
			$("#positionSelect").removeAttr("disabled");
			appendOptions(getPositionNames($('#restaurantSelect option:selected').val(), val), '#positionSelect', true);
			$("#positionSelect").children('option:eq(0)').attr('selected', 'selected');
			$("#Location").val(val);
		}
		else
		{
			$("#positionPhone").val('');
			$("#positionAddress").val('');
			$("#positionSelect").children('option:eq(0)').attr('selected', 'selected');
			$("#positionSelect").attr("disabled","disabled");
			$("#Location").val('');
		}
		$("#JobTitle").val('');
	});
	
	// positionSelect
	$("#positionSelect").change(function()
	{
		var val = this.options[this.selectedIndex].value;
		if(val != null && val != '')
		{
			log("Selected Position: '" + val + "'");			
			$("#JobTitle").val(val);
		}
		else
		{
			$("#JobTitle").val('');
		}
	});
}

// Check to see if we have an existing restaurant, location or position values
// Return true if values were found and the menus were filled, false otherwise
function prefillMenus()
{
	var prefilled = false;
	var restVal = (null == $('#Restaurant').val() || '' == $('#Restaurant').val()) ? DFLT_RESTAURANT : $('#Restaurant').val();
	var locVal  = (null == $('#Location').val() || '' == $('#Location').val()) ? DFLT_RESTAURANT : $('#Location').val();
	var posVal = (null == $('#JobTitle').val() || '' == $('#JobTitle').val()) ? DFLT_RESTAURANT : $('#JobTitle').val();
	//alert("Values= " + restVal + ", " + locVal + ", " + posVal);
	
	if(null != restVal && '' != restVal)
	{
		var rest = getRestaurant(restVal);
		if(null != rest)
		{
			prefilled = true;
			// Populate and select the restaurant menu
			appendOptions(getRestaurantNames(), '#restaurantSelect', true);
			$("#restaurantSelect").selectOptions(rest.name, true);
			
			// Enable and fill the child menus
			appendOptions(getLocationNames(rest.name), '#locationSelect', true);
			$("#locationSelect").removeAttr("disabled");
			var loc = getLocation(rest.name, locVal);
			if(null != loc)
			{
				$("#locationSelect").selectOptions(loc.name, true);
				fillContactInfo(rest.name, rest.locations[i].name);
				
				appendOptions(getPositionNames(rest.name, loc.name), '#positionSelect', true);
				$("#positionSelect").removeAttr("disabled");
			}
			
			if(null != posVal && '' != posVal && null != loc) 
			{
				for(i in loc.positions)
				{
					if(posVal == loc.positions[i].name)
					{
						$("#positionSelect").selectOptions(loc.positions[i].name, true);
					}
				}
			} // if(null != posVal && '' != posVal) 
			
		} // if(null != rest)
	} // if(null != restVal && '' != restVal)
	
	return prefilled;
}

// Append an option to a select menu
function appendOptions(values, menuId, reset)
{
	if(reset)
		clearOptions(menuId);
		
	for(i in values) {
		//log("Appending '" + values[i] + "' to menu '" + menuId + "'");
		$('<option value="' + values[i] + '">' + values[i] + '</option>').appendTo($(menuId));
	}
}

// Clear all but the first option
function clearOptions(menuId)
{
	log("Before clear menu size is " + $(menuId).children('option').length);
	log("Children: " + $(menuId).children('option').length);
	$(menuId).children('option:gt(0)').remove();
	log("After clear menu size is " + $(menuId).children('option').length);
}

function getRestaurants()
{
	return restData.restaurants;
}

function getRestaurantNames()
{
	var rslt = [];
	for(i in restData.restaurants)
		rslt.push(restData.restaurants[i].name);
	
	return rslt.sort();
}

function getRestaurant(name)
{
	var rest = null;
	for(i in restData.restaurants) {
		if(name == restData.restaurants[i].name)
			rest = restData.restaurants[i]
	}
	log("Restaurant lookup: " + (null == rest ? "Restaurant lookup failed!" : "Found it!"));
	return rest;
}

function getLocation(resaurantName, locationName)
{
	var loc = null;
	var rest = getRestaurant(resaurantName);
	for(i in rest.locations) {
		if(locationName == rest.locations[i].name)
			loc = rest.locations[i]
	}
	log("Location lookup: " + (null == loc ? "Location lookup failed!" : "Found it!"));
	return loc;
}

function getLocationNames(restaurantName)
{
	//log("Getting location names for '" + restaurantName + "'");
	var rslt = [];
	var rest = getRestaurant(restaurantName)
	if(null != rest)
	{
		log(rest.name + " has " + rest.locations.length + " Locations.");
		for(i in rest.locations) {
			rslt.push(rest.locations[i].name);
		}
	}
	//log("Locations: " + rslt);
	return rslt.sort();
}

function getPositionNames(resaurantName, locationName)
{
	//log("Getting location names for '" + restaurantName + "'");
	var rslt = [];
	var loc = getLocation(resaurantName, locationName)
	if(null != loc)
	{
		//log(loc.name + " has " + loc.positions.length + " Positions.");
		for(i in loc.positions)
			rslt.push(loc.positions[i].name);
	}	
	//log("Positions: " + rslt);
	return rslt.sort();
}

function fillContactInfo(restaurantName, locationName)
{
	log("Filling contact fields for '" + restaurantName + "' and '" + locationName + "'");
	var rest = getRestaurant(restaurantName)
	if(null != rest)
	{
		var locs = rest.locations
		for(i in locs)
		{
			if(locationName == locs[i].name)
			{
				$("#positionPhone").val(locs[i].phone);
				$("#positionAddress").val(locs[i].email);
				log("Contact Phone is " + $("#positionPhone").val() + "\nContact Email is " + $("#positionAddress").val());
			}
		}
	}
}

function log(msg) {
	if(debug)
		alert(msg);
}