namespace FinancialApi.Application;

public record BalancedJournal
{
    public JournalEntry Entry { get; }

    private BalancedJournal(JournalEntry entry) => Entry = entry;

    public static BalancedJournal Create(Guid id, string description, DateTimeOffset createdAt, List<JournalLine> lines)
    {
        var debits = lines.Where(l => l.Type == EntryType.Debit).Sum(l => l.Amount);
        var credits = lines.Where(l => l.Type == EntryType.Credit).Sum(l => l.Amount);

        if (debits != credits)
        {
            throw new InvalidOperationException(
                $"GAAP Violation: Total Debits ({debits}) must equal Total Credits ({credits})!"
            );
        }

        return new(new JournalEntry(id, description, createdAt, lines));
    }
}