using Admin.NET.Plugin.ApprovalFlow.Service;
using Microsoft.Extensions.Logging;

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

/// <summary>
/// N-1：当 ApprovalFlow 引擎调用 S8 BizHandler（EXCEPTION_ESCALATION / EXCEPTION_CLOSURE）失败时，
/// 写入 ado_s8_notification_log（channel = s8-invoke-handler-failed），让"不可见失败"变可见。
/// 不做反查、不做去重、不做补偿；上抛仍由 ApprovalFlow 引擎完成。
/// </summary>
public class S8FlowHandlerFailureNotifier : IFlowHandlerFailureNotifier, ITransient
{
    public const string AlertChannel = "s8-invoke-handler-failed";

    private static readonly HashSet<string> S8BizTypes = new(StringComparer.Ordinal)
    {
        "EXCEPTION_ESCALATION",
        "EXCEPTION_CLOSURE",
    };

    private readonly S8NotificationService _notificationService;
    private readonly ILogger<S8FlowHandlerFailureNotifier> _logger;

    public S8FlowHandlerFailureNotifier(
        S8NotificationService notificationService,
        ILogger<S8FlowHandlerFailureNotifier> logger)
    {
        _notificationService = notificationService;
        _logger = logger;
    }

    public async Task NotifyAsync(string bizType, long instanceId, Exception exception, CancellationToken cancellationToken = default)
    {
        if (!S8BizTypes.Contains(bizType))
            return;

        var payload = new
        {
            type = "FLOW_HANDLER_FAILED",
            message = "S8 审批流回调 Handler 抛异常，已被引擎上抛；请人工核对业务单与审批实例状态",
            bizType,
            instanceId,
            errorType = exception.GetType().FullName,
            errorMessage = exception.Message,
            detectedAt = DateTime.Now
        };

        await _notificationService.SendAsync(0, 0, null, AlertChannel, payload);
        _logger.LogWarning(
            "S8 FlowHandler 失败已落告警: BizType={BizType}, InstanceId={InstanceId}, ErrorType={ErrorType}, ErrorMessage={ErrorMessage}",
            bizType, instanceId, exception.GetType().FullName, exception.Message);
    }
}