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

/// <summary>
/// G-06 最小问题台账三档状态短码 ↔ 主链状态集合的静态映射。
/// 口径来源《G-06 最小问题台账》§五；不落库、不可配置、不支持运行期追加；
/// 短码白名单固定为 discovered / processing / closed，留空视为全量；
/// hold / suspend / pending / all 等一律视为非法参数。
/// </summary>
public static class S8IssueLedgerStates
{
    /// <summary>台账状态短码：已登记但尚未被接单。</summary>
    public const string Discovered = "discovered";

    /// <summary>台账状态短码：已进入处置链路。</summary>
    public const string Processing = "processing";

    /// <summary>台账状态短码：终局（CLOSED / REJECTED）。</summary>
    public const string Closed = "closed";

    /// <summary>短码 → 主链状态集合。挂起不存在，hold / suspend / pending 均视为非法参数。</summary>
    private static readonly IReadOnlyDictionary<string, IReadOnlyList<string>> ShortCodeToStatuses =
        new Dictionary<string, IReadOnlyList<string>>(StringComparer.Ordinal)
        {
            [Discovered] = new[] { "NEW" },
            [Processing] = new[] { "ASSIGNED", "IN_PROGRESS", "PENDING_VERIFICATION", "ESCALATED", "RESOLVED" },
            [Closed] = new[] { "CLOSED", "REJECTED" }
        };

    /// <summary>由主链状态解析台账短码；未归类返回 null。</summary>
    public static string? TryGetShortCode(string? status)
    {
        if (string.IsNullOrWhiteSpace(status)) return null;
        return status switch
        {
            "NEW" => Discovered,
            "ASSIGNED" or "IN_PROGRESS" or "PENDING_VERIFICATION" or "ESCALATED" or "RESOLVED" => Processing,
            "CLOSED" or "REJECTED" => Closed,
            _ => null
        };
    }

    /// <summary>由台账短码获取对应主链状态集合；未知短码返回空集合。</summary>
    public static IReadOnlyList<string> GetStatuses(string? shortCode)
    {
        if (string.IsNullOrWhiteSpace(shortCode)) return Array.Empty<string>();
        return ShortCodeToStatuses.TryGetValue(shortCode, out var statuses)
            ? statuses
            : Array.Empty<string>();
    }

    /// <summary>三档短码对应的全部主链状态集合（便于查询层复用）。</summary>
    public static IReadOnlyList<string> AllStatuses { get; } = new[]
    {
        "NEW",
        "ASSIGNED", "IN_PROGRESS", "PENDING_VERIFICATION", "ESCALATED", "RESOLVED",
        "CLOSED", "REJECTED"
    };
}