static bool TrySolveSequences(GrouppedTransactions groupOfTransactions, IEnumerable <GrouppedTransactions> grouppedTransactions)
{
var lenders = groupOfTransactions.Transactions.Select(db => db.LenderId);
if (!transactions.Any(t => lenders.Contains(t.DebtorId)))
{
return(false);
}
var debtOfLender = transactions.Where(t => lenders.Contains(t.DebtorId))
.OrderByDescending(db => db.Amount)
.First();
var debtToLender = groupOfTransactions.Transactions.First(db => db.LenderId == debtOfLender.DebtorId);
var existingTransaction = transactions.Where(t => t.DebtorId == debtToLender.DebtorId &&
t.LenderId == debtOfLender.LenderId)
.FirstOrDefault();
if (debtToLender.Amount >= debtOfLender.Amount)
{
if (existingTransaction != null)
{
existingTransaction.Amount += debtOfLender.Amount;
}
else
{
transactions.Add(new Transaction
{
DebtorId = debtToLender.DebtorId,
LenderId = debtOfLender.LenderId,
Amount = debtOfLender.Amount
});
}
debtToLender.Amount -= debtOfLender.Amount;
transactions.Remove(debtOfLender);
}
else
{
if (existingTransaction != null)
{
existingTransaction.Amount += debtToLender.Amount;
}
else
{
transactions.Add(new Transaction
{
DebtorId = debtToLender.DebtorId,
LenderId = debtOfLender.LenderId,
Amount = debtToLender.Amount
});
}
debtOfLender.Amount -= debtToLender.Amount;
transactions.Remove(debtToLender);
}
return(true);
}
static bool TrySolveNeighbours(GrouppedTransactions groupOfTransactions, IEnumerable <GrouppedTransactions> grouppedTransactions)
{
var lenders = groupOfTransactions.Transactions.Select(db => db.LenderId);
var subjectWithCommonLender = grouppedTransactions.Where(g => g.Transactions.Any(t => t.LenderId == groupOfTransactions.SubjectId) &&
g.Transactions.Any(t => lenders.Contains(t.LenderId)))
.Select(g => new
{
CommonDebt = g.Transactions.First(t => lenders.Contains(t.LenderId)),
DebtToSubject = g.Transactions.First(t => t.LenderId == groupOfTransactions.SubjectId)
})
.FirstOrDefault();
if (subjectWithCommonLender == null)
{
return(false);
}
var commonDebt = groupOfTransactions.Transactions.First(t => t.LenderId == subjectWithCommonLender.CommonDebt.LenderId);
if (subjectWithCommonLender.DebtToSubject.Amount >= commonDebt.Amount)
{
subjectWithCommonLender.CommonDebt.Amount += commonDebt.Amount;
subjectWithCommonLender.DebtToSubject.Amount -= commonDebt.Amount;
transactions.Remove(commonDebt);
}
else
{
commonDebt.Amount -= subjectWithCommonLender.DebtToSubject.Amount;
subjectWithCommonLender.CommonDebt.Amount += subjectWithCommonLender.DebtToSubject.Amount;
transactions.Remove(subjectWithCommonLender.DebtToSubject);
}
return(true);
}