using System.Collections.Concurrent;
using DispenserCommon.DTO;
using DispenserCommon.Events;
using DispenserCommon.Ioc;
using DispenserCommon.Utils;
using DispenserCore.Context;
using DispenserCore.Model.Entity;
using Masuit.Tools;
using Serilog;

namespace DispenserCore.Service;

/// <summary>
/// 操作日志处理器
/// </summary>
[Component]
public class OperationLogHandler
{
    private static readonly BlockingCollection<ActionLog> Queue = new();

    private readonly OperationLogService _service = ServiceLocator.GetService<OperationLogService>();

    private readonly GlobalSessionHolder _session = ServiceLocator.GetService<GlobalSessionHolder>();

    private bool _started;

    private readonly object _lock = new();

    // 批量罗盘阈值
    private const int Batch = 1;

    /// <summary>
    /// 往队列里面添加操作日志
    /// </summary>
    /// <param name="_"></param>
    /// <param name="actionLog"></param>
    [EventAction(EventType.OperationLog)]
    public void Record(EventType _, ActionLog actionLog)
    {
        Queue.Add(actionLog);
        if (!_started)
        {
            Start();
        }
    }


    /// <summary>
    /// 启动日志记录处理器
    /// </summary>
    private void Start()
    {
        lock (_lock)
        {
            Task.Run(() =>
            {
                try
                {
                    _started = true;
                    while (!Queue.IsCompleted)
                    {
                        List<OperationLog> logs = [];

                        var session = _session.GetSession();

                        while (Queue.TryTake(out var log))
                        {
                            if (log.IsNullOrEmpty()) continue;

                            var operationLog = new OperationLog
                            {
                                Action = log.Name,
                                Params = JsonUtil.ToJson(log.Params),
                                Exception = JsonUtil.ToJson(log.Exception),
                                OperateTime = log.OperateTime
                            };

                            if (session != null)
                            {
                                operationLog.UserId = session.User.Id;
                                operationLog.UserName = session.User.UserName;
                            }

                            // 将log 写入日志
                            logs.Add(operationLog);

                            if (logs.Count < Batch) continue;
                            // 每10条一批刷新到数据库
                            FlushToDb(logs);
                            logs = [];
                        }
                    }
                }
                catch (Exception e)
                {
                    Log.Error(e,"操作日志保存异常: ");
                }
                
            }).ConfigureAwait(false);
        }
    }

    /// <summary>
    /// 保存到数据库
    /// </summary>
    private void FlushToDb(IEnumerable<OperationLog> logs)
    {
        _service.BatchInsert(logs);
    }
}