/*Returns the total cost of all items in the supplied order.*/
public double getOrderCost(Order order)
{
double totalCost = 0;
try
{
List <OrderLine> orderLines = new OrderLineService().getByOrder(order); //Throws NoRecordException
//set order total cost
foreach (OrderLine orderLine in orderLines)
{
if (orderLine.orderLineType.id == 1) //rent
{
TimeSpan duration = orderLine.enddate - orderLine.startdate;
totalCost += orderLine.dvdInfo.rent_price * duration.Days;
}
else if (orderLine.orderLineType.id == 2) //buy
{
totalCost += orderLine.dvdInfo.buy_price;
}
}
}
catch (NoRecordException)
{
}
return(Math.Round(totalCost, 2));
}
/*Returns a dictionary of (dvd_info_id, number_of_times_bought).*/
public Dictionary <String, int> getItemsBoughtByCustomer(Customer customer)
{
Dictionary <String, int> dvdAmount = new Dictionary <String, int>();
try
{
List <OrderLine> orderLines = new OrderLineService().getByCustomer(customer);
foreach (OrderLine orderLine in orderLines)
{
if (!dvdAmount.ContainsKey(orderLine.dvdInfo.dvd_info_id))
{
dvdAmount.Add(orderLine.dvdInfo.dvd_info_id, 1);
}
else
{
dvdAmount[orderLine.dvdInfo.dvd_info_id] = dvdAmount[orderLine.dvdInfo.dvd_info_id] + 1;
}
}
} catch (NoRecordException ex)
{
//user has never purchased anything
}
return(dvdAmount);
}
/*Returns the number of items the user has purchased.*/
public int getNumberOfOrderLinesForCustomer(Customer customer)
{
List <OrderLine> orderLines;
try
{
orderLines = new OrderLineService().getByCustomer(customer);
}
catch (NoRecordException ex)
{
//user has never purchased anything
orderLines = new List <OrderLine>();
}
return(orderLines.Count);
}
/*Converts the customer's shopping cart to an order and returns it*/
public Order createOrder(Customer user)
{
try
{
//get all items currently in cart
List <ShoppingcartItem> cartContent = new ShoppingCartService().getCartContentForCustomer(user); //Throws NoRecordException
//create new order for this user
int orderID = new OrderService().addOrderForCustomer(user); //Throws NoRecordException
Order thisOrder = new OrderService().getByID(orderID.ToString());
OrderLineService orderLineService = new OrderLineService();
//add cart items to newly created order
foreach (ShoppingcartItem item in cartContent)
{
OrderLine orderline = new OrderLine
{
order = new OrderService().getByID(orderID.ToString()), //Throws NoRecordException
dvdInfo = new DvdInfoService().getByID(item.dvdInfo.dvd_info_id.ToString()), //Throws NoRecordException
//dvd_copy_id = copy.dvd_copy_id, //don't add a copy_id yet, only do this when a user has paid (id will be set in admin module)
startdate = item.startdate,
enddate = item.enddate,
//order_line_type_id is verhuur/verkoop? dan kunnen we dat eigenlijk via join ophalen via dvd_copy tabel
orderLineType = new OrderLineTypeService().getByID(item.dvdCopyType.id.ToString()) //Throws NoRecordException
};
if (orderLineService.add(orderline))
{
//succes
}
}
//clear cart
if (new ShoppingCartService().deleteByCustomer(user))
{
//success
}
return(thisOrder);
}
catch (NoRecordException)
{
return(null);
}
}
/*Returns the number of items currently being rented by the user.*/
public int getNumberOfActiveRentOrdersCopiesForCustomer(Customer customer)
{
int numberOfCurrentlyRentedItems = 0;
try
{
List <OrderLine> orderLines = new OrderLineService().getActiveRentOrderLinesByCustomer(customer); //Throws NoRecordException
foreach (OrderLine orderLine in orderLines)
{
numberOfCurrentlyRentedItems++;
}
}
catch (NoRecordException ex)
{
//user has no active rent orders
}
return(numberOfCurrentlyRentedItems);
}
/*Deletes the supplied orderLine from its order. Also deletes the order itself if it no longer contains any orderLines after deleting the supplied one.*/
public bool deleteItemFromOrder(OrderLine orderLine)
{
Order order = orderLine.order;
if (new OrderLineService().delete(orderLine))
{
try
{
List <OrderLine> orderLines = new OrderLineService().getByOrder(order);
}
catch (NoRecordException ex)
{
//this order no longer contains any orderlines, delete the entire order
new OrderService().delete(order);
}
return(true);
}
else
{
return(false);
}
}
/*Sets the supplied order as paid and assigns a dvd copy to each orderLine (if possible).*/
public void payOrder(Order selectedOrder)
{
//set the order status to PAID
selectedOrder.orderstatus = new OrderStatusService().getByID("2"); //Throws NoRecordException
new OrderService().updateOrder(selectedOrder);
//assign copies to the orderlines
List <OrderLine> orderLines = new OrderLineService().getByOrder(selectedOrder); //Throws NoRecordException
foreach (OrderLine orderLine in orderLines)
{
if (orderLine.orderLineType.id == 1) //rent copy
{
DvdInfo thisDVD = orderLine.dvdInfo;
//get all unavailable dates starting from TODAY
Dictionary <int, List <DateTime> > dicCopyUnavailableDates = new AvailabilityModel().getAllUnavailableDaysPerCopyForDvdInfo(thisDVD, DateTime.Today); //Throws NoRecordException
Dictionary <int, int> dicDaysFreeForCopy = new Dictionary <int, int>(); //contains the number of free days for the dvdCopy (copy-id, freedays)
int selectedCopyId = -1; //id of the copy that will be assigned to this orderLine
//loop over the list of occupied dates per copy, check how many free dates exist around the chosen period, store that amount in dicDaysFreeForCopy
foreach (KeyValuePair <int, List <DateTime> > entry in dicCopyUnavailableDates)
{
//determine how many days the copy will be rented
int rentPeriodDays = (orderLine.enddate - orderLine.startdate).Days;
bool copyIsAvailable = true;
for (int i = 0; i <= rentPeriodDays; i++)
{
//loop over the occupied days, check if the copy is available on all of the requested dates
if (entry.Value.Contains(orderLine.startdate.AddDays(i)))
{
//one of the requested days is not free, this copy can not be used
copyIsAvailable = false;
}
}
if (copyIsAvailable)
{
//we now know this copy has the needed time available, now to determine the size of this free period
dicDaysFreeForCopy.Add(entry.Key, 0);
//check the amount of free days between start date and the first unavailable date (going backwards)
bool unavailableFound = false;
int offset = 0;
do
{
if (entry.Value.Contains(orderLine.startdate.AddDays(-offset)) || orderLine.startdate.AddDays(-offset) == DateTime.Today)
{
//the copy is reserved on this date, break out of loop
unavailableFound = true;
}
else
{
dicDaysFreeForCopy[entry.Key]++;
offset++;
}
} while (!unavailableFound);
//check the amount of free days between end date and the first unavailable date (going forward)
unavailableFound = false;
offset = 0;
do
{
if (entry.Value.Contains(orderLine.enddate.AddDays(offset)) || orderLine.enddate.AddDays(offset) >= DateTime.Today.AddDays(14))
{
//the copy is reserved on this date, break out of loop
unavailableFound = true;
}
else
{
dicDaysFreeForCopy[entry.Key]++;
offset++;
}
} while (!unavailableFound);
}
}
int daysFree = 1000;
//loop over all copies, select the one with the smallest free window
foreach (KeyValuePair <int, int> entryDays in dicDaysFreeForCopy)
{
if (entryDays.Value < daysFree)
{
daysFree = entryDays.Value;
selectedCopyId = entryDays.Key;
}
}
//assign the copy if it has been found
if (selectedCopyId > 0)
{
try
{
orderLine.dvdCopy = new DvdCopyService().getByID(selectedCopyId.ToString()); //Throws NoRecordException || DALException
}
catch (NoRecordException)
{
//No dvd's were found
}
new OrderLineService().updateOrderLine(orderLine);
//update the amount_sold field of the dvdInfo record
orderLine.dvdInfo.amount_sold = orderLine.dvdInfo.amount_sold + 1;
new DvdInfoService().update(orderLine.dvdInfo); //Throws NoRecordException
}
else
{
//no copies with future orderLines are available for this reservation/rent order
//get all fully available copies (=copies with no orderLines in the future) to assign to this orderline
try
{
List <DvdCopy> dvdCopies = new DvdCopyService().getAllFullyAvailableCopies(thisDVD, orderLine.startdate); //Throws NoRecordException || DALException
//set the first available copy as the copy for this orderline
orderLine.dvdCopy = dvdCopies[0];
//update database
new OrderLineService().updateOrderLine(orderLine);
//update the amount_sold field of the dvdInfo record
dvdCopies[0].dvdinfo.amount_sold += 1;
new DvdInfoService().update(dvdCopies[0].dvdinfo);
}
catch (Exception ex)
{
//no copy can be assigned at this time, this means someone else received the last copy between the time where
//this user added the item to his cart and when he payed for the order.
}
}
}
else if (orderLine.orderLineType.id == 2) //sale copy
{
//get all available copies
//get this list again for every item so you can add a new, available copy to the order
List <DvdCopy> availableCopies = new DvdCopyService().getAllInStockBuyCopiesForDvdInfo(orderLine.dvdInfo); //Throws NoRecordException || DALException
//get the first available copy
//set the found copy as the copy for this orderline
orderLine.dvdCopy = availableCopies[0];
new OrderLineService().updateOrderLine(orderLine);
//update the amount_sold field of the dvdInfo record
DvdInfo dvdInfo = availableCopies[0].dvdinfo;
dvdInfo.amount_sold = dvdInfo.amount_sold + 1;
new DvdInfoService().update(dvdInfo); //Throws NoRecordException
//mark the found copy as NOT in_stock
availableCopies[0].in_stock = false;
if (new DvdCopyService().updateCopy(availableCopies[0])) //Throws NoRecordException || DALException
{
//Success, record updated
}
}
}
}
/**Returns a list of recommendations based on the user's order history.
* 1) Gets all past orders and determines the user's 3 favourite genres.
* 2) Gets a list of DVDs that have the most matches with the user's favourites.
* A dvd that contains all 3 favourite genres will rank higher than a dvd that only matches 1 favourite genre.
* 3) Removes dvds that the user has already rented or bought before.
* 4) If no dvd's are left (or if the user had no orderlines), a list of DVDs is generated based on the pages the user has visited.
*/
public List <DvdInfo> getRecommendations(Customer customer, int amount)
{
List <DvdInfo> dvdList = new List <DvdInfo>();
List <Genre> genres = new List <Genre>();
List <OrderLine> orderLines;
try
{
orderLines = new OrderLineService().getByCustomer(customer); //Throws NoRecordException
} catch (Exception error)
{
orderLines = new List <OrderLine>();
}
orderLinesDvdIds = new List <String>(); //list that contains the DVDids of the orderlines (=movies that the user has rented before)
GenreService genreService = new GenreService();
DvdInfoService dvdInfoService = new DvdInfoService();
//customer has at least 1 order, base recommendations on orderLines
if (orderLines.Count > 0)
{
foreach (OrderLine line in orderLines)
{
String dvdID = line.dvdInfo.dvd_info_id;
genres.AddRange(genreService.getGenresForDvd(dvdID)); //Throws NoRecordException
//fill orderLinesDvdIds
if (!orderLinesDvdIds.Contains(dvdID))
{
orderLinesDvdIds.Add(dvdID);
}
}
//put genres in a dictionary (genreID, numberOfOccurrances)
Dictionary <int, int> genreCountMap = new Dictionary <int, int>();
foreach (Genre genre in genres)
{
if (genreCountMap.ContainsKey(genre.genre_id))
{
genreCountMap[genre.genre_id]++;
}
else
{
genreCountMap.Add(genre.genre_id, 1);
}
}
//loop over dictionary and find the 3 most occuring genres
int[] maxGenres = { 0, 0, 0 };
int[] maxCounts = { 0, 0, 0 };
foreach (KeyValuePair <int, int> pair in genreCountMap)
{
if (maxCounts[0] < pair.Value)
{
maxCounts[2] = maxCounts[1];
maxCounts[1] = maxCounts[0];
maxCounts[0] = pair.Value;
maxGenres[2] = maxGenres[1];
maxGenres[1] = maxGenres[0];
maxGenres[0] = pair.Key;
}
else if (maxCounts[1] < pair.Value)
{
maxCounts[2] = maxCounts[1];
maxCounts[1] = pair.Value;
maxGenres[2] = maxGenres[1];
maxGenres[1] = pair.Key;
}
else if (maxCounts[2] < pair.Value)
{
maxCounts[2] = pair.Value;
maxGenres[2] = pair.Key;
}
}
//we now have the user's 3 favourite genres in maxGenres, use that info to get the dvds that match those 3 genres the most
//get max 16 dvds. Index will always show maximum 4, but catalog can show up to 16
List <String> dvdIds = dvdInfoService.getRecommendations(maxGenres, 16); //Throws NoRecordException
List <String> dvdTempIds = new List <String>();
//only accept dvd's that the user had not watched yet
foreach (String id in dvdIds)
{
if (!orderLinesDvdIds.Contains(id))
{
dvdTempIds.Add(id);
}
}
if (dvdTempIds.Count > 0)
{
foreach (String id in dvdTempIds)
{
dvdList.Add(dvdInfoService.getByID(id.ToString())); //Throws NoRecordException
}
}
else
{
//customer has already bought or rented every suggestion, recommend the movies whose pages the user has viewed most often
dvdList = getMostViewedDvdInfos(customer); //Throws NoRecordException
}
}
else
{
//customer has no orderlines, recommend the movies whose pages the user has viewed the most
dvdList = getMostViewedDvdInfos(customer); //Throws NoRecordException
}
//remove elements until the list size is the requested size (4 for index row, 16 for catalog page)
//loop deletes a random item until the size is ok so the user gets different recommendations on every visit/refresh
Random rnd = new Random();
while (dvdList.Count > amount)
{
dvdList.RemoveAt(rnd.Next(dvdList.Count));
}
return(dvdList);
}
