void SaveState(ViewModel model)
{
//create comma delimited list of product ids
model.SavedRequested = string.Join(",", model.RequestedProducts.Select(p => p.Id.ToString()).ToArray());
//Available products = All - Requested
model.AvailableProducts = Product.GetAllProducts().Except(model.RequestedProducts).ToList();
}
void RemoveProducts(ViewModel model)
{
if (model.RequestedSelected != null)
{
model.RequestedProducts.RemoveAll(p => model.RequestedSelected.Contains(p.Id));
model.RequestedSelected = null;
}
}
void AddProducts(ViewModel model)
{
if (model.AvailableSelected != null)
{
var prods = Product.GetAllProducts().Where(p => model.AvailableSelected.Contains(p.Id));
model.RequestedProducts.AddRange(prods);
model.AvailableSelected = null;
}
}
void RestoreSavedState(ViewModel model)
{
model.RequestedProducts = new List<Product>();
//get the previously stored items
if (!string.IsNullOrEmpty(model.SavedRequested))
{
string[] prodids = model.SavedRequested.Split(',');
var prods = Product.GetAllProducts().Where(p => prodids.Contains(p.Id.ToString()));
model.RequestedProducts.AddRange(prods);
}
}
public ActionResult Index(ViewModel model, string add, string remove, string send)
{
//Need to clear model state or it will interfere with the updated model
ModelState.Clear();
RestoreSavedState(model);
if (!string.IsNullOrEmpty(add))
AddProducts(model);
else if (!string.IsNullOrEmpty(remove))
RemoveProducts(model);
else if (!string.IsNullOrEmpty(send))
{
Validate(model);
if (ModelState.IsValid)
return RedirectToAction("Done");
//todo: implement SendListToSanta method...
}
SaveState(model);
return View(model);
}
private void Validate(ViewModel model)
{
if (model.RequestedTotal > 400m)
ModelState.AddModelError("", "Total must be 400 or less");
if (model.RequestedProducts.Count > 3)
ModelState.AddModelError("", "Maximum of 3 selections allowed");
if (string.IsNullOrEmpty(model.SavedRequested))
ModelState.AddModelError("", "You haven't selected any presents!");
}
public ActionResult Index()
{
ViewModel model = new ViewModel { AvailableProducts = Product.GetAllProducts(), RequestedProducts = new List<Product>() };
return View(model);
}
