using Admin.NET.Plugin.AiDOP.Service.S8;
using Furion.Schedule;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using System.Text.Json;

namespace Admin.NET.Plugin.AiDOP.Job;

/// <summary>
/// G-08：S8 自动监控主链定时调度作业。
/// 固定租户 / 工厂上下文下，按周期触发一次 G-01 主链（<see cref="S8WatchSchedulerService.CreateExceptionsAsync"/>）。
/// 本轮仅完成"正式定时触发接入"；不在调度层追加业务逻辑、不改写主链入参语义、不做真实 SQL / 认证链路 / SLA 治理。
/// 周期由 [Period] 属性固化为默认值（30 分钟）；运行期调整走 Admin.NET 作业管理，不走配置中心。
/// 开关：默认通过 Admin.NET 作业管理的触发器状态控制；本作业构造不自动启动。
/// </summary>
[JobDetail("job_s8_watch_scheduler", Description = "S8 自动监控主链定时调度",
    GroupName = "default", Concurrent = false)]
[Period(S8WatchSchedulerJob.IntervalMs, TriggerId = "trigger_s8_watch_scheduler", Description = "默认 30 分钟一次")]
public class S8WatchSchedulerJob : IJob
{
    private readonly IServiceScopeFactory _scopeFactory;
    private readonly ISchedulerFactory _schedulerFactory;
    private readonly ILogger _logger;

    // G-08 调度周期（毫秒）。属性固化锚点，见 G08-02 配置分类表第 2 项。
    // 既供 [Period] 使用，也供首次激活日志打印，避免两处数值漂移。
    public const int IntervalMs = 1800000;

    // G-08 固定租户 / 工厂上下文。与 G-01 验收口径一致。
    private const long DefaultTenantId = 1;
    private const long DefaultFactoryId = 1;

    // G-08 作业与触发器 ID。用于自动停调度时精确定位本作业。
    private const string JobId = "job_s8_watch_scheduler";

    // G08-05 运行期自动停调度：连续失败阈值（代码常量锚点，见 G08-02 配置分类表第 7 项）。
    private const int FailurePauseThreshold = 2;

    // G08-02 首次作业激活可见性：作业首次激活时打印一次关键运行参数的生效值，后续周期不重复。
    // 仅覆盖属性固化与代码常量两类；appsettings 与作业管理两类的当前值不在此打印。
    private static int _firstActivationLogged;

    // G08-05 连续失败计数（仅同进程内有效；跨进程由 Admin.NET 作业管理手工介入，见 G08-03）。
    private static int _consecutiveFailureCount;

    public S8WatchSchedulerJob(
        IServiceScopeFactory scopeFactory,
        ISchedulerFactory schedulerFactory,
        ILoggerFactory loggerFactory)
    {
        _scopeFactory = scopeFactory;
        _schedulerFactory = schedulerFactory;
        _logger = loggerFactory.CreateLogger(nameof(S8WatchSchedulerJob));
    }

    public async Task ExecuteAsync(JobExecutingContext context, CancellationToken stoppingToken)
    {
        if (Interlocked.Exchange(ref _firstActivationLogged, 1) == 0)
        {
            _logger.LogInformation(
                "S8WatchSchedulerJob 首次作业激活参数：IntervalMs={IntervalMs} Concurrent=false TenantId={TenantId} FactoryId={FactoryId}",
                IntervalMs, DefaultTenantId, DefaultFactoryId);
        }

        var triggeredAt = DateTime.Now;
        using var scope = _scopeFactory.CreateScope();
        var scheduler = scope.ServiceProvider.GetRequiredService<S8WatchSchedulerService>();

        try
        {
            var results = await scheduler.CreateExceptionsAsync(DefaultTenantId, DefaultFactoryId);
            var created = results.Count(r => r.Created);
            var skipped = results.Count(r => r.Skipped);
            var failed = results.Count(r => !r.Created && !r.Skipped);
            var firstFailure = results.FirstOrDefault(r => !r.Created && !r.Skipped);
            _logger.LogInformation(BuildTraceLine(
                triggeredAt: triggeredAt,
                result: "success",
                hits: results.Count,
                created: created,
                skipped: skipped,
                failed: failed,
                failureSummary: TruncateSummary(firstFailure?.ErrorMessage ?? firstFailure?.Reason)));
            // 本轮主链未抛异常 → 重置连续失败计数（单条 create_failed 不计入调度失败）。
            Interlocked.Exchange(ref _consecutiveFailureCount, 0);
        }
        catch (OperationCanceledException) when (stoppingToken.IsCancellationRequested)
        {
            _logger.LogInformation(BuildTraceLine(
                triggeredAt: triggeredAt,
                result: "cancelled",
                hits: 0, created: 0, skipped: 0, failed: 0,
                failureSummary: null));
            // 取消不计入连续失败。
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, BuildTraceLine(
                triggeredAt: triggeredAt,
                result: "error",
                hits: 0, created: 0, skipped: 0, failed: 0,
                failureSummary: TruncateSummary(ex.Message)));
            var count = Interlocked.Increment(ref _consecutiveFailureCount);
            if (count >= FailurePauseThreshold)
            {
                TryAutoPause(count, ex);
            }
        }
    }

    // G08-05 运行期自动停调度：命中 FailurePauseThreshold 后调用框架原生暂停作业能力；
    // 不自建停调度通道；停调度原因单独留痕一行，便于检索。
    private void TryAutoPause(int failureCount, Exception lastError)
    {
        try
        {
            var scheduleResult = _schedulerFactory.TryPauseJob(JobId, out _);
            _logger.LogWarning(
                "S8WatchSchedulerJob 自动停调度：FailureCount={FailureCount} Threshold={Threshold} ScheduleResult={ScheduleResult} Reason={Reason}",
                failureCount, FailurePauseThreshold, scheduleResult, TruncateSummary(lastError.Message));
        }
        catch (Exception pauseEx)
        {
            // 停调度本身失败不重试、不回退；仅记录，等待人工介入。
            _logger.LogError(pauseEx,
                "S8WatchSchedulerJob 自动停调度调用失败：FailureCount={FailureCount}",
                failureCount);
        }
    }

    // G08-04 结构化留痕：单行 JSON 字符串，承载最低 6 字段（触发时间 / 执行结果 / 命中数 / 创建数 / 跳过数 / 失败摘要）。
    // 不建新表、不上日志库、不上链路追踪；失败摘要仅截断首条错误，不做异常归集。
    private static string BuildTraceLine(
        DateTime triggeredAt, string result, int hits, int created, int skipped, int failed, string? failureSummary)
    {
        var payload = new
        {
            job = "S8WatchSchedulerJob",
            triggeredAt = triggeredAt.ToString("yyyy-MM-dd HH:mm:ss"),
            result,
            hits,
            created,
            skipped,
            failed,
            failureSummary
        };
        return "S8WatchSchedulerJob 留痕 " + JsonSerializer.Serialize(payload);
    }

    private static string? TruncateSummary(string? raw)
    {
        if (string.IsNullOrWhiteSpace(raw)) return null;
        var oneLine = raw.Replace('\n', ' ').Replace('\r', ' ').Trim();
        return oneLine.Length <= 200 ? oneLine : oneLine[..200];
    }
}