namespace PowderCoating.Web.Helpers;

/// <summary>
/// Checks whether an accounting entry date falls within a locked period.
/// The lock date is stored on the Company as BookLockedThrough and is set by CompanyAdmin
/// users to prevent backdating entries into periods that have already been closed.
/// </summary>
public static class AccountingPeriodValidator
{
    /// <summary>Returns true when the entry date is on or before the lock date (period is closed).</summary>
    public static bool IsLocked(DateTime entryDate, DateTime? lockedThrough) =>
        lockedThrough.HasValue && entryDate.Date <= lockedThrough.Value.Date;

    /// <summary>User-facing message to display when a write is blocked by period locking.</summary>
    public static string LockedMessage(DateTime? lockedThrough) =>
        $"This period is locked — books are closed through {lockedThrough!.Value:MMMM d, yyyy}. " +
        "Unlock the period in Company Settings → Accounting to make changes.";
}