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

namespace Admin.NET.Plugin.ApprovalFlow;

/// <summary>
/// 审批超时自动处理作业 — 每 5 分钟扫描一次超时的待办任务
/// </summary>
[JobDetail("job_flow_timeout", Description = "审批超时自动处理",
    GroupName = "default", Concurrent = false)]
[Period(300000, TriggerId = "trigger_flow_timeout", Description = "每5分钟执行")]
public class FlowTimeoutJob : IJob
{
    private readonly IServiceScopeFactory _scopeFactory;
    private readonly ILogger _logger;

    public FlowTimeoutJob(IServiceScopeFactory scopeFactory, ILoggerFactory loggerFactory)
    {
        _scopeFactory = scopeFactory;
        _logger = loggerFactory.CreateLogger("FlowTimeoutJob");
    }

    public async Task ExecuteAsync(JobExecutingContext context, CancellationToken stoppingToken)
    {
        using var scope = _scopeFactory.CreateScope();
        var db = scope.ServiceProvider.GetRequiredService<ISqlSugarClient>().CopyNew();
        var engine = scope.ServiceProvider.GetRequiredService<FlowEngineService>();

        var pendingTasks = await db.Queryable<ApprovalFlowTask>()
            .InnerJoin<ApprovalFlowInstance>((t, i) => t.InstanceId == i.Id)
            .Where((t, i) => t.Status == FlowTaskStatusEnum.Pending
                          && i.Status == FlowInstanceStatusEnum.Running)
            .Select((t, i) => new
            {
                TaskId = t.Id,
                TaskCreatedAt = t.CreateTime,
                NodeId = t.NodeId,
                FlowJsonSnapshot = i.FlowJsonSnapshot,
            })
            .ToListAsync();

        var now = DateTime.Now;
        var processed = 0;

        foreach (var item in pendingTasks)
        {
            if (stoppingToken.IsCancellationRequested) break;

            try
            {
                if (string.IsNullOrWhiteSpace(item.FlowJsonSnapshot)) continue;

                var flowData = JsonSerializer.Deserialize<ApprovalFlowItem>(item.FlowJsonSnapshot);
                var node = flowData?.Nodes?.FirstOrDefault(n => n.Id == item.NodeId);
                var props = node?.Properties;

                if (props?.TimeoutHours == null || props.TimeoutHours <= 0) continue;
                if (string.IsNullOrWhiteSpace(props.TimeoutAction)) continue;

                var deadline = item.TaskCreatedAt.AddHours(props.TimeoutHours.Value);
                if (now < deadline) continue;

                if (props.TimeoutAction == "Notify")
                {
                    var alreadyNotified = await db.Queryable<ApprovalFlowLog>()
                        .AnyAsync(log => log.TaskId == item.TaskId
                                      && log.Action == FlowLogActionEnum.AutoTimeout);
                    if (alreadyNotified) continue;
                }

                await engine.HandleTimeoutTask(item.TaskId);
                processed++;
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "处理超时任务 {TaskId} 失败", item.TaskId);
            }
        }

        if (processed > 0)
            _logger.LogInformation("FlowTimeoutJob 本轮处理了 {Count} 个超时任务", processed);
    }
}