Initial code for the optional todo #8 of part 3

scripts/viewmediator/sgs.mediator.consumption-scenarios.js

@@ -48,6 +48,10 @@ sgs.mediator.consumptionscenarios.createViewMediator = function (pageSettings) {
 	// Save the view model
 	sgs.mediator.consumptionscenarios.setViewModel(viewModel);	
 
+	// Set the pricing based on the Coffee Pricing view model
+	var priceList = sgs.mediator.coffeepricing.getViewModel();
+	viewModel.pricing(priceList);
+
 	if (typeof(console) != 'undefined' && console) console.info("sgs.mediator.coffeeconsumption ready!");
 }
 

scripts/viewmodel/sgs.model.coffee-consumption.js

@@ -11,6 +11,7 @@ sgs.model.coffeeconsumption.initializeViewModel = function (pageSettings, scenar
 	if (typeof(pageSettings) == 'undefined') var pageSettings = { }
 
 	var viewModel = {
+		pricing: 		ko.observable(null), 
 		scenarioName: 		ko.observable(scenarioName), 
 		drinkType: 			ko.observable("Regular"), 
 		drinkSize: 			ko.observable("Tall"), 
@@ -45,7 +46,16 @@ sgs.model.coffeeconsumption.initializeViewModel = function (pageSettings, scenar
 
 	// Stub implementation to be fully implemented later on
 	viewModel.costPerWeek = ko.dependentObservable(function() {
-		var result = 0;
+		// Get the base price
+		if (this.pricing() == null) {
+			return 0;
+		}
+
+		var basePrice 	= this.pricing().getCoffeeBeveragePrice(this.drinkType(), this.drinkSize());
+		var dailyCost 	= basePrice * this.drinksPerDay();
+		var weeklyCost	= dailyCost * this.drinkDaysPerWeek();
+		var result 		= Math.round(weeklyCost * 100) / 100;
+
 		return result;
 	}, viewModel);
 

scripts/viewmodel/sgs.model.consumption-scenarios.js

@@ -14,13 +14,15 @@ sgs.model.consumptionscenarios.initializeViewModel = function (pageSettings) {
 	var proposed 	= sgs.model.coffeeconsumption.initializeViewModel (pageSettings, "Proposed");
 
 	var viewModel = {
+		pricing: 				ko.observable(null), 
 		currentConsumption: 		ko.observable(current),
 		proposedConsumption: 	ko.observable(proposed)
 	};
 
 	// Stub implementation to be fully implemented later on
 	viewModel.savingsPerWeek = ko.dependentObservable(function() {
-		var result = 0;
+		var costDifference = this.currentConsumption().costPerWeek() - this.proposedConsumption().costPerWeek();
+		var result = Math.round(costDifference * 100) / 100;
 		return result;
 	}, viewModel);
 
@@ -30,5 +32,10 @@ sgs.model.consumptionscenarios.initializeViewModel = function (pageSettings) {
 		return result;
 	}, viewModel);
 
+	viewModel.pricing.subscribe(function(newPricing) {
+		viewModel.currentConsumption().pricing(newPricing);
+		viewModel.proposedConsumption().pricing(newPricing);
+	});
+
 	return viewModel;
 }