// if all the constraints are respected it will create the user, otherwise it throws exception
public void CreateUser(string username, string password)
{
ChecksOnUsernameAndPassword(username, password);
if (Cs == null)
{
throw new InvalidOperationException("It was not possible to reach the Db");
}
using (var Db = new AuctionSiteContext(Cs))
{
SiteFactory.ChecksOnDbConnection(Db);
var siteEntity = Db.Sites.FirstOrDefault(s => s.Name == Name);
if (null == siteEntity)
{
throw new InvalidOperationException("the site is deleted");
}
if (Db.Users.Any(u => u.Username == username && u.SiteName == Name))
{
throw new NameAlreadyInUseException(nameof(username), " of user already in use");
}
Db.Users.Add(new UserEntity(username, password, Name)
{
Site = siteEntity
});
Db.SaveChanges();
}
}
// it returns the session if it is still valid
public ISession GetSession(string sessionId)
{
if (sessionId == null)
{
throw new ArgumentNullException(nameof(sessionId), " is null");
}
SiteFactory.ChecksOnCsAndClock(Cs, AlarmClock);
using (var Db = new AuctionSiteContext(Cs))
{
SiteFactory.ChecksOnDbConnection(Db);
if (!Db.Sites.Any(s => s.Name == Name))
{
throw new InvalidOperationException("the site is deleted");
}
var sessionEntity = Db.Sessions.SingleOrDefault(s => s.Id == sessionId);
if (sessionEntity == null)
{
return(null);
}
var session = new Session(sessionEntity.ValidUntil, sessionEntity.Username, sessionEntity.SiteName)
{
AlarmClock = AlarmClock,
Cs = Cs
};
return(session.IsValid() ? session : null);
}
}
// return the auctions if the site is still present
public IEnumerable <IAuction> GetAuctions(bool onlyNotEnded)
{
SiteFactory.ChecksOnCsAndClock(Cs, AlarmClock);
using (var Db = new AuctionSiteContext(Cs))
{
SiteFactory.ChecksOnDbConnection(Db);
if (!Db.Sites.Any(s => s.Name == Name))
{
throw new InvalidOperationException("the site is deleted");
}
var auctionsEntities = Db.Auctions.Where(a => a.SiteName == Name).Select(a => a).ToList();
var auctionsList = new List <Auction>();
foreach (var a in auctionsEntities)
{
var auction = new Auction(a.Id, a.Description, a.EndsOn, a.SiteName)
{
Cs = Cs, AlarmClock = AlarmClock
};
if (!onlyNotEnded || !auction.IsEnded())
{
auctionsList.Add(auction);
}
}
return(auctionsList);
}
}
// if the site is still existing it will delete all the sessions
public void CleanupSessions()
{
SiteFactory.ChecksOnCsAndClock(Cs, AlarmClock);
using (var Db = new AuctionSiteContext(Cs))
{
SiteFactory.ChecksOnDbConnection(Db);
var siteEntity = Db.Sites.SingleOrDefault(s => s.Name == Name);
if (null == siteEntity)
{
throw new InvalidOperationException("the site is deleted");
}
var sessionsEntities = Db.Sessions.Where(s => s.SiteName == Name).Select(s => s).ToList();
foreach (var s in sessionsEntities)
{
var tmpSession = new Session(s.ValidUntil, s.Username, s.SiteName)
{
Cs = Cs, AlarmClock = AlarmClock
};
if (!tmpSession.IsValid())
{
tmpSession.Logout();
}
}
Db.SaveChanges();
}
}
public IEnumerable <IAuction> WonAuctions()
{
SiteFactory.ChecksOnCsAndClock(Cs, AlarmClock);
using (var Db = new AuctionSiteContext(Cs))
{
SiteFactory.ChecksOnDbConnection(Db);
if (!Db.Users.Any(u => u.Username == Username && u.SiteName == SiteName))
{
throw new InvalidOperationException("the user does not exist anymore");
}
var auctionsEntities = Db.Auctions.Where(a => a.SiteName == SiteName && a.WinnerUsername == Username)
.Select(a => a).ToList();
var auctionList = new List <Auction>();
foreach (var aEntity in auctionsEntities)
{
var a = new Auction(aEntity.Id, aEntity.Description, aEntity.EndsOn, aEntity.SiteName)
{
Cs = Cs,
AlarmClock = AlarmClock
};
if (a.IsEnded())
{
auctionList.Add(a);
}
}
return(auctionList);
}
}
// after the constraints it creates the auction, renews the the session, returns the auction
public IAuction CreateAuction(string description, DateTime endsOn, double startingPrice)
{
SiteFactory.ChecksOnCsAndClock(Cs, AlarmClock);
using (var Db = new AuctionSiteContext(Cs))
{
SiteFactory.ChecksOnDbConnection(Db);
if (description == null)
{
throw new ArgumentNullException(nameof(description), "is null");
}
if (string.IsNullOrEmpty(description))
{
throw new ArgumentException("is empty", nameof(description));
}
if (startingPrice < 0)
{
throw new ArgumentOutOfRangeException(nameof(startingPrice), "is negative");
}
if (endsOn.CompareTo(AlarmClock.Now) < 0)
{
throw new UnavailableTimeMachineException("endsOn precedes the current ISite's time");
}
if (!Db.Sessions.Any(s => s.Id == Id))
{
throw new InvalidOperationException(nameof(Session) + " not consistent");
}
var siteEntity = Db.Sites.SingleOrDefault(site => site.Name == SiteName);
if (siteEntity == null)
{
throw new InvalidOperationException("the site does not exist anymore");
}
var sellerEntity = Db.Users.SingleOrDefault(s => s.SiteName == siteEntity.Name && s.Username == Username);
if (sellerEntity == null)
{
throw new InvalidOperationException("the user does not exist anymore");
}
var time = siteEntity.SessionExpirationInSeconds;
var auctionEntity =
new AuctionEntity(description, endsOn, startingPrice, Username, SiteName)
{
Seller = sellerEntity
};
Db.Auctions.Add(auctionEntity);
ResetTime(time);
Db.SaveChanges();
var auction = new Auction(auctionEntity.Id, auctionEntity.Description, auctionEntity.EndsOn,
auctionEntity.SiteName)
{
Cs = Cs, AlarmClock = AlarmClock
};
return(auction);
}
}
// delete every corresponded objects since it is the root of an aggregate
public void Delete()
{
SiteFactory.ChecksOnCsAndClock(Cs, AlarmClock);
using (var Db = new AuctionSiteContext(Cs))
{
SiteFactory.ChecksOnDbConnection(Db);
var siteEntity = Db.Sites.SingleOrDefault(s => s.Name == Name);
if (null == siteEntity)
{
throw new InvalidOperationException("the site is already deleted");
}
var sessionsEntities = Db.Sessions.Where(s => s.SiteName == Name).Select(s => s).ToList();
// disposes the sessions' site and auctions' site
foreach (var sEntity in sessionsEntities)
{
var s = new Session(sEntity.ValidUntil, sEntity.Username, sEntity.SiteName)
{
Cs = Cs,
AlarmClock = AlarmClock
};
s.Logout();
}
var auctionsEntities = Db.Auctions.Where(a => a.SiteName == Name).Select(a => a).ToList();
foreach (var aEntity in auctionsEntities)
{
var a = new Auction(aEntity.Id, aEntity.Description, aEntity.EndsOn, aEntity.SiteName)
{
Cs = Cs,
AlarmClock = AlarmClock
};
a.Delete();
}
// disposes the users' site
var usersEntities = Db.Users.Where(u => u.SiteName == Name).Select(u => u).ToList();
foreach (var uEntity in usersEntities)
{
var u = new User(uEntity.Username, uEntity.SiteName)
{
Cs = Cs, AlarmClock = AlarmClock
};
u.Delete();
}
}
using (var Db = new AuctionSiteContext(Cs)) {
var siteEntity = Db.Sites.SingleOrDefault(s => s.Name == Name);
if (null == siteEntity)
{
throw new InvalidOperationException("the site is already deleted");
}
Db.Sites.Remove(siteEntity);
Db.SaveChanges();
}
}
double IAuction.CurrentPrice()
{
SiteFactory.ChecksOnCsAndClock(Cs, AlarmClock);
using (var Db = new AuctionSiteContext(Cs))
{
SiteFactory.ChecksOnDbConnection(Db);
var auctionEntity = Db.Auctions.SingleOrDefault(a => a.Id == Id && a.SiteName == SiteName);
if (auctionEntity == null)
{
throw new InvalidOperationException("the auction does not exist anymore");
}
return(auctionEntity.CurrentPrice);
}
}
// to checks if it is valid that is correctly present on the db and not expired
public bool IsValid()
{
// controllo che sia correttamente creata e presente sul DB
SiteFactory.ChecksOnCsAndClock(Cs, AlarmClock);
using (var Db = new AuctionSiteContext(Cs))
{
SiteFactory.ChecksOnDbConnection(Db);
var sessionEntity = Db.Sessions.SingleOrDefault(s => s.Id == Id);
if (null == sessionEntity) // sessione cancellata, logout effettuato
{
return(false);
}
return(sessionEntity.ValidUntil.CompareTo(AlarmClock.Now) > 0); // Ritorna maggiore di zero se la scadenza è dopo l'ora attuale
}
}
// to reset the expiration time
internal void ResetTime(int seconds)
{
SiteFactory.ChecksOnCsAndClock(Cs, AlarmClock);
using (var Db = new AuctionSiteContext(Cs))
{
SiteFactory.ChecksOnDbConnection(Db);
var sessionEntity = Db.Sessions.SingleOrDefault(s => s.Id == Id);
if (sessionEntity == null)
{
throw new InvalidOperationException("the session does not exist anymore");
}
sessionEntity.ValidUntil = AlarmClock.Now.AddSeconds(seconds);
ValidUntil = sessionEntity.ValidUntil;
Db.SaveChanges();
}
}
public void Delete()
{
SiteFactory.ChecksOnCsAndClock(Cs, AlarmClock);
using (var Db = new AuctionSiteContext(Cs))
{
SiteFactory.ChecksOnDbConnection(Db);
var auctionEntity = Db.Auctions.SingleOrDefault(a => a.Id == Id && a.SiteName == SiteName);
if (auctionEntity == null)
{
throw new InvalidOperationException("the auction does not exist anymore");
}
Db.Auctions.Remove(auctionEntity);
Db.SaveChanges();
}
}
// to end the session if it is still present
public void Logout()
{
if (Cs == null)
{
throw new InvalidOperationException("State of entity out of context, no data available");
}
using (var Db = new AuctionSiteContext(Cs))
{
SiteFactory.ChecksOnDbConnection(Db);
var sessionEntity = Db.Sessions.SingleOrDefault(s => s.Id == Id);
if (null == sessionEntity) // sessione cancellata, logout effettuato
{
throw new InvalidOperationException(nameof(SessionEntity) + " not consistent");
}
Db.Sessions.Remove(sessionEntity);
Db.SaveChanges();
}
}
// it allows to sign in if possible. If a session already existing it will be renewed in each cases otherwise a new one is created.
public ISession Login(string username, string password)
{
ChecksOnUsernameAndPassword(username, password);
SiteFactory.ChecksOnCsAndClock(Cs, AlarmClock);
using (var Db = new AuctionSiteContext(Cs))
{
SiteFactory.ChecksOnDbConnection(Db);
if (!Db.Sites.Any(s => s.Name == Name))
{
throw new InvalidOperationException("the site is deleted");
}
var userEntity = Db.Users.SingleOrDefault(u => u.Username == username && u.Password == password && u.SiteName == Name);
if (null == userEntity) // l'utente non esiste o dati sbagliati
{
return(null);
}
var sessionEntity = Db.Sessions.SingleOrDefault(s => s.Id == Name + username);
var session = new Session(AlarmClock.Now.AddSeconds(SessionExpirationInSeconds), username, Name)
{
AlarmClock = AlarmClock,
Cs = Cs
};
if (sessionEntity == null) // l'utente esiste e non ha una sessione attiva
{
// new session
sessionEntity = new SessionEntity(AlarmClock.Now.AddSeconds(SessionExpirationInSeconds), username, Name)
{
User = userEntity
};
Db.Sessions.Add(sessionEntity);
}
else
{
session.ResetTime(SessionExpirationInSeconds); // l'utente esiste e ha una sessione valida oppure no, si rinnova comunque
}
Db.SaveChanges();
return(session);
}
}
// it returns all the sessions if the site is not deleted
public IEnumerable <ISession> GetSessions()
{
SiteFactory.ChecksOnCsAndClock(Cs, AlarmClock);
using (var Db = new AuctionSiteContext(Cs))
{
SiteFactory.ChecksOnDbConnection(Db);
if (!Db.Sites.Any(s => s.Name == Name))
{
throw new InvalidOperationException("the site is deleted");
}
var sessionsEntities = Db.Sessions.Where(s => s.SiteName == Name).Select(s => s).ToList();
var sessions = new List <Session>();
foreach (var s in sessionsEntities)
{
sessions.Add(new Session(s.ValidUntil, s.Username, s.SiteName)
{
AlarmClock = AlarmClock, Cs = Cs
});
}
return(sessions);
}
}
public IUser CurrentWinner()
{
SiteFactory.ChecksOnCsAndClock(Cs, AlarmClock);
using (var Db = new AuctionSiteContext(Cs))
{
SiteFactory.ChecksOnDbConnection(Db);
var auctionEntity = Db.Auctions.SingleOrDefault(a => a.Id == Id && a.SiteName == SiteName);
if (auctionEntity == null)
{
throw new InvalidOperationException("the auction does not exist anymore");
}
if (null == auctionEntity.WinnerUsername)
{
return(null);
}
var userEntity = Db.Users.SingleOrDefault(u => u.Username == auctionEntity.WinnerUsername && u.SiteName == SiteName);
return(null == userEntity ? null : new User(userEntity.Username, userEntity.SiteName)
{
Cs = Cs, AlarmClock = AlarmClock
});
}
}
// it returns all the users if the site is not deleted
public IEnumerable <IUser> GetUsers()
{
SiteFactory.ChecksOnCsAndClock(Cs, AlarmClock);
using (var Db = new AuctionSiteContext(Cs))
{
SiteFactory.ChecksOnDbConnection(Db);
if (!Db.Sites.Any(s => s.Name == Name))
{
throw new InvalidOperationException("the site is deleted");
}
var usersEntities = Db.Users.Where(s => s.SiteName == Name).ToList();
var users = new List <User>();
foreach (var u in usersEntities)
{
users.Add(new User(u.Username, u.SiteName)
{
AlarmClock = AlarmClock, Cs = Cs
});
}
return(users);
}
}
public bool BidOnAuction(ISession session, double offer)
{
// constraints, many checks on the args and the corresponding permanent objects
if (null == session)
{
throw new ArgumentNullException(nameof(session), "is null");
}
if (offer < 0)
{
throw new ArgumentOutOfRangeException(nameof(offer), "offer is negative");
}
SiteFactory.ChecksOnCsAndClock(Cs, AlarmClock);
using (var Db = new AuctionSiteContext(Cs))
{
SiteFactory.ChecksOnDbConnection(Db);
if (!(session is Session))
{
throw new ArgumentException("the session is not valid: it is out of the context");
}
var s = (Session)session;
s.Cs = Cs;
s.AlarmClock = AlarmClock;
var sessionEntity = Db.Sessions.SingleOrDefault(sE => sE.Id == s.Id);
if (null == sessionEntity)
{
throw new ArgumentException("the session is not valid: it does not exist anymore");
}
var siteEntity = Db.Sites.SingleOrDefault(site => site.Name == sessionEntity.SiteName);
if (siteEntity == null)
{
throw new InvalidOperationException("the site does not exist anymore");
}
if (!Db.Users.Any(u => u.Username == sessionEntity.Username && u.SiteName == sessionEntity.SiteName))
{
throw new InvalidOperationException("the user does not exist anymore");
}
var auctionEntity = Db.Auctions.SingleOrDefault(a => a.Id == Id && a.SiteName == SiteName);
if (null == auctionEntity)
{
throw new InvalidOperationException("the auction does not exist anymore");
}
if (IsEnded())
{
throw new InvalidOperationException("the auction is already closed");
}
ChecksOnSession(s, auctionEntity.SiteName);
// the session is valid, the bid too
var minimum = siteEntity.MinimumBidIncrement;
var time = siteEntity.SessionExpirationInSeconds;
var winning = auctionEntity.WinnerUsername;
var firstBid = auctionEntity.FirstBid;
var currentPrice = auctionEntity.CurrentPrice;
var highestPrice = auctionEntity.HighestPrice;
s.ResetTime(time);
Db.SaveChanges();
if (BidIsNotAccepted(s.Username, winning, firstBid, offer, minimum, currentPrice, highestPrice))
{
return(false);
}
if (!firstBid && winning != s.Username && offer <= highestPrice)
{
currentPrice = offer + minimum < highestPrice ? offer + minimum : highestPrice;
auctionEntity.CurrentPrice = currentPrice;
}
else // a new major bidder is coming!
{
if (!firstBid && winning != s.Username)
{
currentPrice = offer < highestPrice + minimum ? offer : highestPrice + minimum;
auctionEntity.CurrentPrice = currentPrice;
}
auctionEntity.HighestPrice = offer;
auctionEntity.WinnerUsername = s.Username;
}
auctionEntity.FirstBid = false;
Db.SaveChanges();
return(true);
}
}
// it checks if ended
internal bool IsEnded()
{
SiteFactory.ChecksOnCsAndClock(Cs, AlarmClock);
return(EndsOn.CompareTo(AlarmClock.Now) < 0); // se minore di zero allora la fine dell'asta è antecedente l'ora attuale
}
public void Delete()
{
SiteFactory.ChecksOnCsAndClock(Cs, AlarmClock);
using (var Db = new AuctionSiteContext(Cs))
{
SiteFactory.ChecksOnDbConnection(Db);
var userEntity = Db.Users.SingleOrDefault(u => u.Username == Username && u.SiteName == SiteName);
if (null == userEntity)
{
throw new InvalidOperationException("the user does not exist anymore");
}
// owner of auctions not ended yet, winner of auctions not ended yet -> IOE exception
var anySellerAuctionsEntities = Db.Auctions.Where(a => a.SellerUsername == Username && a.SiteName == SiteName);
var anySellerAuctions = new List <Auction>();
var anyWinnerAuctionsEntities = Db.Auctions.Where(a => a.WinnerUsername == Username && a.SiteName == SiteName);
var deletable = true;
foreach (var aEntity in anySellerAuctionsEntities)
{
var a = new Auction(aEntity.Id, aEntity.Description, aEntity.EndsOn, aEntity.SiteName)
{
Cs = Cs, AlarmClock = AlarmClock
};
anySellerAuctions.Add(a);
if (a.IsEnded())
{
continue;
}
deletable = false;
break;
}
if (!deletable)
{
throw new InvalidOperationException("the user's auction(s) is not ended yet");
}
foreach (var aEntity in anyWinnerAuctionsEntities)
{
var a = new Auction(aEntity.Id, aEntity.Description, aEntity.EndsOn, aEntity.SiteName)
{
Cs = Cs, AlarmClock = AlarmClock
};
if (a.IsEnded())
{
continue;
}
deletable = false;
break;
}
if (!deletable)
{
throw new InvalidOperationException("the user is winning an auction not ended yet");
}
// ended owned auctions are disposed, ended won auctions are updated
foreach (var a in anySellerAuctions)
{
a.Delete();
}
foreach (var a in anyWinnerAuctionsEntities)
{
a.WinnerUsername = null;
}
var sessions = Db.Sessions.Where(s => s.SiteName == SiteName && s.Username == Username).Select(s => s);
foreach (var s in sessions)
{
Db.Sessions.Remove(s);
}
Db.SaveChanges();
}
using (var Db = new AuctionSiteContext(Cs))
{
var userEntity = Db.Users.SingleOrDefault(u => u.Username == Username && u.SiteName == SiteName);
if (null == userEntity)
{
throw new InvalidOperationException("the user does not exist anymore");
}
// the user is removed and the Db and AlarmClock must be null
Db.Users.Remove(userEntity);
Db.SaveChanges();
}
}