public async Task OptimizeForSettling(long groupId, long creditorId, long debtorId)
{
DebtMatrix debtMatrix = await LoadDebtMatrix(groupId);
debtMatrix.SetDebt(debtorId, creditorId, 0);
debtMatrix.Optimize();
await SaveDebtMatrix(groupId, debtMatrix);
}
public async Task OptimizeForNewSpending(long userId, NewSpending newSpending)
{
DebtMatrix debtMatrix = await LoadDebtMatrix(newSpending.GroupId);
foreach (var debtor in newSpending.Debtors)
{
debtMatrix.UpdateDebt(debtor.DebtorId, userId, debtor.Debt);
}
debtMatrix.Optimize();
await SaveDebtMatrix(newSpending.GroupId, debtMatrix);
}
public async Task OptimizeForUpdateSpending(long groupId, long creditorId, Dictionary <long, long> oldDebts, Dictionary <long, long> newDebts)
{
DebtMatrix debtMatrix = await LoadDebtMatrix(groupId);
Dictionary <long, long> deltaDebts = CalculateDeltaDebts(oldDebts, newDebts);
foreach (var deltaDebt in deltaDebts)
{
debtMatrix.UpdateDebt(deltaDebt.Key, creditorId, deltaDebt.Value);
}
debtMatrix.Optimize();
await SaveDebtMatrix(groupId, debtMatrix);
}
private async Task OptimizeHelper(long groupId)
{
var daoGroup = await Context.Groups
.Include(x => x.Members).ThenInclude(x => x.User)
.Include(x => x.CreatorUser)
.SingleOrDefaultAsync(x => x.Id == groupId);
var daoSpendings = await Context.Spendings
.Include(x => x.Creditor)
.Include(x => x.Debtors).ThenInclude(x => x.Debtor)
.Where(x => x.GroupId == groupId)
.ToListAsync();
var daoSettlements = Context.Settlements
.Where(x => x.GroupId == groupId);
var userIds = daoGroup.Members.Select(x => x.UserId).ToArray();
DebtMatrix debtMatrix = new DebtMatrix(userIds);
foreach (var userId in userIds)
{
var userSpendings = daoSpendings.Where(x => x.CreditorUserId == userId);
foreach (var userSpending in userSpendings)
{
foreach (var daoDebtor in userSpending.Debtors)
{
debtMatrix.UpdateDebt(daoDebtor.DebtorUserId, userId, daoDebtor.Debt);
}
}
}
foreach (var daoSettlement in daoSettlements)
{
if (daoGroup.Members.Any(x => x.UserId == daoSettlement.From) && daoGroup.Members.Any(x => x.UserId == daoSettlement.To))
{
debtMatrix.UpdateDebt(daoSettlement.To, daoSettlement.From, daoSettlement.Amount);
}
}
debtMatrix.Optimize();
await SaveDebtMatrix(groupId, debtMatrix);
}
private async Task <DebtMatrix> LoadDebtMatrix(long groupId)
{
var daoGroup = await Context.Groups
.SingleOrDefaultAsync(x => x.Id == groupId);
var userIds = daoGroup.Members.Select(x => x.UserId).ToArray();
DebtMatrix debtMatrix = new DebtMatrix(userIds);
var optimizedDebts = await Context.OptimizedDebt
.Where(x => x.GroupId == groupId)
.ToListAsync();
foreach (var optimizedDebt in optimizedDebts)
{
debtMatrix.UpdateDebt(optimizedDebt.UserOwesId, optimizedDebt.UserOwedId, optimizedDebt.OweAmount);
}
return(debtMatrix);
}
private async Task SaveDebtMatrix(long groupId, DebtMatrix debtMatrix)
{
var oldOptimizedDebts = await Context.OptimizedDebt
.Where(x => x.GroupId == groupId)
.ToListAsync();
Context.OptimizedDebt.RemoveRange(oldOptimizedDebts);
IList <DebtMatrix.OptimizedDebt> optimizedDebts = debtMatrix.GetOptimizedDebts();
IList <DaoOptimizedDebt> daoOptimizedDebts = optimizedDebts.Select(x =>
new DaoOptimizedDebt()
{
GroupId = groupId,
UserOwesId = x.debtorId,
UserOwedId = x.creditorId,
OweAmount = x.amount
}).ToList();
await Context.AddRangeAsync(daoOptimizedDebts);
}