private static BigTable BuildBigTable(Database database, IEnumerable <Account> accounts, DateTime fromDate, DateTime toDate)
{
var transactionGroups = database.Transactions
.Where(t => accounts.Contains(t.Account) && t.ValueDate >= fromDate && t.ValueDate <= toDate)
.GroupBy(c => c.Category);
var bigTable = new BigTable
{
Dates = new DateTime[(toDate.Year - fromDate.Year) * 12 + (toDate.Month - fromDate.Month) + 1],
};
for (var i = 0; i < bigTable.Dates.Length; i++)
{
bigTable.Dates[i] = fromDate.AddMonths(i);
}
foreach (var group in transactionGroups)
{
string?categoryName = null;
string?categoryGroupName = null;
if (group.Key != null)
{
var category = group.Key;
categoryName = category.Name;
categoryGroupName = category.GroupName;
}
var bigTableGroup = bigTable.CategoryGroups.Find(g => string.Equals(g.Name, categoryGroupName, StringComparison.Ordinal));
if (bigTableGroup == null)
{
bigTableGroup = new BigTableCategoryGroup(bigTable)
{
Name = categoryGroupName,
};
bigTable.CategoryGroups.Add(bigTableGroup);
}
var bigTableCategory = new BigTableCategory(bigTableGroup)
{
Name = categoryName,
};
bigTableGroup.Categories.Add(bigTableCategory);
foreach (var transaction in group)
{
var index = (transaction.ValueDate.Year - fromDate.Year) * 12 + (transaction.ValueDate.Month - fromDate.Month);
bigTableCategory.Totals[index].Add(transaction.Amount);
}
}
bigTable.ComputeTotals();
bigTable.CategoryGroups.Sort(NameComparer.Instance);
foreach (var categoryGroup in bigTable.CategoryGroups)
{
categoryGroup.Categories.Sort(NameComparer.Instance);
}
return(bigTable);
}
public BigTableCategoryGroup(BigTable bigTable)
{
BigTable = bigTable ?? throw new ArgumentNullException(nameof(bigTable));
}
