Oli Sturm
33 lines
1.0 KiB
C#
33 lines
1.0 KiB
C#
namespace CsharpFp1.Domain;
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public sealed record Account(Guid Id, Money Balance);
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public static class AccountDomain
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{
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// Choosing a "clean" FP approach here of instantiating the Account
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// Depending on needs, code to prevent the Account type from
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// being instantiated without this helper needs to be added
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// to the record type.
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public static Account Open(Guid id, Money openingBalance)
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{
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if (openingBalance.Amount < 0)
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throw new ArgumentOutOfRangeException(nameof(openingBalance));
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return new Account(id, openingBalance);
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}
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public static Account Withdraw(Account account, Money amount)
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{
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if (amount.Amount <= 0)
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throw new InvalidOperationException("Withdrawal amount must be positive.");
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if (account.Balance.Amount < amount.Amount)
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throw new InsufficientBalanceException(account.Balance, amount);
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return account with
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{
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Balance = account.Balance.Subtract(amount),
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};
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}
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}
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