namespace FinancialApi.Domain.Entities;

public enum AccountType
{
    Liability,
    Debit,
    Credit,
    Revenue
}

public record Account(int Id, decimal Balance, AccountType Type)
{
    public Account ApplyPosting(decimal amount, EntryType entryType)
    {
        if (amount <= 0)
        {
            throw new ArgumentException("Amount must be positive.");
        }

        var newBalance = entryType == EntryType.Credit ? Balance + amount : Balance - amount;
        ;

        if (newBalance < 0 && Type is AccountType.Liability or AccountType.Debit or AccountType.Revenue)
        {
            throw new InsufficientFundsException("Insufficient funds.");
        }

        return this with { Balance = newBalance };
    }
}

public class InsufficientFundsException(string insufficientFunds) : Exception(insufficientFunds);