namespace Admin.NET.Plugin.AiDOP.Infrastructure.S8;

/// <summary>
/// 异常状态合法流转（与 S8 方案文档 3.5 节一致）。
/// </summary>
public static class S8StatusRules
{
    private static readonly HashSet<(string From, string To)> Edges = new()
    {
        ("NEW", "ASSIGNED"),
        ("NEW", "REJECTED"),
        ("ASSIGNED", "IN_PROGRESS"),
        ("ASSIGNED", "ESCALATED"),
        ("ASSIGNED", "REJECTED"),
        ("IN_PROGRESS", "RESOLVED"),
        ("IN_PROGRESS", "PENDING_VERIFICATION"),
        ("PENDING_VERIFICATION", "RESOLVED"),
        ("PENDING_VERIFICATION", "IN_PROGRESS"),
        ("IN_PROGRESS", "ESCALATED"),
        ("IN_PROGRESS", "REJECTED"),
        ("RESOLVED", "CLOSED"),
        ("RESOLVED", "IN_PROGRESS"),
        ("ESCALATED", "ASSIGNED"),
        ("ESCALATED", "IN_PROGRESS"),
        ("REJECTED", "NEW"),
    };

    public static bool IsAllowedTransition(string from, string to) =>
        Edges.Contains((from, to));

    public static bool IsTerminal(string status) => status == "CLOSED";
}