using System.Text.Json;

namespace Admin.NET.Plugin.AiDOP.Service.S8.Rules;

/// <summary>
/// R2 TIMEOUT 类规则 params_json 解析结果。internal 可见，供测试覆盖。
/// 字段缺失或非法 JSON：调用方负责降级（evaluator 静默返空命中），不在此抛出业务异常。
/// </summary>
internal sealed class S8TimeoutParams
{
    public string? DueAtField { get; set; }
    public string? StatusField { get; set; }
    public List<string> CompletedStates { get; } = new();
    public string? ObjectCodeField { get; set; }
    public string? ObjectIdField { get; set; }
    public int GraceMinutes { get; set; }
    public string? ExceptionTypeCode { get; set; }

    /// <summary>解析 params_json；非法 JSON 抛 <see cref="JsonException"/>，由上游捕获。</summary>
    public static S8TimeoutParams Parse(string json)
    {
        using var doc = JsonDocument.Parse(json);
        var root = doc.RootElement;
        var p = new S8TimeoutParams();
        if (root.TryGetProperty("dueAtField", out var v1)) p.DueAtField = v1.GetString();
        if (root.TryGetProperty("statusField", out var v2)) p.StatusField = v2.GetString();
        if (root.TryGetProperty("objectCodeField", out var v3)) p.ObjectCodeField = v3.GetString();
        if (root.TryGetProperty("objectIdField", out var v4)) p.ObjectIdField = v4.GetString();
        if (root.TryGetProperty("graceMinutes", out var v5) && v5.ValueKind == JsonValueKind.Number) p.GraceMinutes = v5.GetInt32();
        if (root.TryGetProperty("exceptionTypeCode", out var v6)) p.ExceptionTypeCode = v6.GetString();
        if (root.TryGetProperty("completedStates", out var v7) && v7.ValueKind == JsonValueKind.Array)
        {
            foreach (var s in v7.EnumerateArray())
            {
                var str = s.GetString();
                if (!string.IsNullOrWhiteSpace(str)) p.CompletedStates.Add(str!);
            }
        }
        return p;
    }
}