public async Task <bool> PurchaseCart(string userId)
{
var currentCartKey = $"{cartItemsForUserKey}-{userId}";
if (connectivityService.IsThereInternet)
{
IInventoryService inventoryService = DependencyService.Get <IInventoryService>();
// Get current items from on-device cache
var currentItems = Barrel.Current.Get <List <ShoppingCartItem> >(currentCartKey);
List <BareShoppingCartItemInfo> currentCart = new List <BareShoppingCartItemInfo>();
foreach (var product in currentItems)
{
var bareInfo = new BareShoppingCartItemInfo {
ProductId = product.ProductId, Sku = product.Sku
};
currentCart.Add(bareInfo);
}
try
{
// send the on-device items to cloud to purchase. May result in a conflict if cloud stored items don't match
await webApi.PurchaseItems(userId, currentCart).ConfigureAwait(false);
Barrel.Current.Empty(currentCartKey);
}
catch (ApiException ex) when(ex.StatusCode == System.Net.HttpStatusCode.Conflict)
{
// We have a conflict. The ApiException object will have more info in it as to the objects that don't match
Analytics.TrackEvent("conflict during purchase");
return(false);
}
catch (Exception ex)
{
Crashes.TrackError(ex);
return(false);
}
// Decrement the inventory for everything
foreach (var product in currentItems)
{
await inventoryService.DecrementInventory(product.Sku);
}
}
else
{
return(false);
}
return(true);
}
// intentional offline bug - we don't check for anything that's been deleted while offline and then send up those deleted items to the server when back online
public async Task DeleteItemFromCart(string userId, BareShoppingCartItemInfo item)
{
var currentCartKey = $"{cartItemsForUserKey}-{userId}";
var currentItems = Barrel.Current.Get <List <ShoppingCartItem> >(currentCartKey);
currentItems.Remove(currentItems.FirstOrDefault(ci => ci.ProductId == item.ProductId));
Barrel.Current.Add(currentCartKey, currentItems, TimeSpan.FromMinutes(30));
if (connectivityService.IsThereInternet)
{
await webApi.DeleteItemFromCart(userId, item).ConfigureAwait(false);
}
}
// intentional bug where we don't check send anything up that's been added while offline and send those items up to the server when back online
public async Task AddItemToCart(string userId, BareShoppingCartItemInfo item)
{
var currentCartKey = $"{cartItemsForUserKey}-{userId}";
var currentItems = Barrel.Current.Get <List <ShoppingCartItem> >(currentCartKey) ?? new List <ShoppingCartItem>();
currentItems.Add(new ShoppingCartItem()
{
ProductId = item.ProductId, Sku = item.Sku, Quantity = 1, UserId = userId, DateModified = DateTime.Now
});
Barrel.Current.Add(currentCartKey, currentItems, TimeSpan.FromMinutes(30));
if (connectivityService.IsThereInternet)
{
await webApi.AddItemToCart(userId, item).ConfigureAwait(false);
}
}
