namespace SimpleAdmin.Application;

/// <summary>同步第三方状态时的单向迁移保护；未知/陈旧结果不能覆盖已确认的签署进度。</summary>
internal static class OnboardingSignStateGuard
{
    internal static string Resolve(string current, string incoming)
    {
        if (current == ElectronicSignStatus.Archived && incoming == ElectronicSignStatus.Completed)
            return ElectronicSignStatus.Archived;
        if (IsTerminal(current) && current != incoming)
            throw Oops.Bah("契约锁返回状态与本地终态不一致，已保留本地状态，请核实后重试");
        if (current == ElectronicSignStatus.PendingCompanySeal
            && incoming is not (ElectronicSignStatus.PendingCompanySeal
                or ElectronicSignStatus.Completed or ElectronicSignStatus.Archived
                or ElectronicSignStatus.Rejected or ElectronicSignStatus.Invalid or ElectronicSignStatus.Expired))
            throw Oops.Bah("契约锁状态暂未同步，已保留员工签署结果，请稍后重试");
        return incoming;
    }

    private static bool IsTerminal(string status)
        => status is ElectronicSignStatus.Completed or ElectronicSignStatus.Archived
            or ElectronicSignStatus.Rejected or ElectronicSignStatus.Invalid or ElectronicSignStatus.Expired;
}