using System.Collections.Concurrent;
using System.Timers;
using System.Xml;

using Abp.Dependency;
using Abp.Logging;
using Abp.UI;

using VberZero.Configuration;
using VberZero.Tools.StringModel;

using Timer = System.Timers.Timer;

namespace VberZero.DomainService.AppGuids;

public class RecordIdManager : ISingletonDependency
{
    public RecordIdManager(IWebHostEnvironment env)
    {
        var cfg = env.GetAppConfiguration();

        Interval = cfg["RecordId:TimerInterval"]?.ValD() ?? 10;
        HasChanged = true;
        FileName = Path.Combine(env.ContentRootPath, cfg["RecordId:Path"] ?? VzConsts.ResourceBasePath,
            "Guids.Vzx");
    }

    //分钟
    private decimal Interval { get; }

    private bool HasChanged { get; set; }
    private string FileName { get; set; }

    /// <summary>
    /// 定时器
    /// </summary>
    private Timer _timer;

    private static ConcurrentDictionary<AppGuidType, RecordId> RecordIddDictionary { get; set; }

    /// <summary>
    /// 获取下一记录ID
    /// </summary>
    /// <param name="type"></param>
    /// <returns></returns>
    public int GetNextRecordId(AppGuidType type)
    {
        HasChanged = true;
        if (RecordIddDictionary.TryGetValue(type, out var record))
        {
            return record.GetNextId();
        }
        throw new UserFriendlyException("获取下一记录ID失败！");
    }

    /// <summary>
    /// 加载文件数据
    /// </summary>
    public void LoadDictionary(string fileName = null)
    {
        if (fileName.NotEmpty())
        {
            FileName = fileName;
        }
        if (!File.Exists(FileName))
        {
            //throw new Exception("未查询到Guid文件，请检查配置！");
            LogHelper.Logger.Error("【未查询到Guid文件，请检查配置！】");
            return;
        }
        RecordIddDictionary = new ConcurrentDictionary<AppGuidType, RecordId>();
        try
        {
            var xDoc = new XmlDocument();
            xDoc.Load(FileName ?? throw new InvalidOperationException());
            XmlNode xmlNode = xDoc.LastChild;
            if (xmlNode is { HasChildNodes: true })
            {
                foreach (XmlNode node in xmlNode.ChildNodes)
                {
                    var record = new RecordId
                    {
                        IdType = (node.Attributes?["type"] != null ? node.Attributes["type"].Value : "")
                            .GetEnumByName<AppGuidType>(),
                        Step = (node.Attributes?["step"] != null ? node.Attributes["step"].Value : "").ValI(),
                        LastId = (node.Attributes?["last-id"] != null ? node.Attributes["last-id"].Value : "")
                            .ValI(),
                        LastDate = (node.Attributes?["last-date"] != null
                            ? node.Attributes["last-date"].Value
                            : "").StrToDt()
                    };
                    if (!RecordIddDictionary.ContainsKey(record.IdType))
                    {
                        RecordIddDictionary.TryAdd(record.IdType, record);
                    }
                }
            }
            //触发定时器执行
            ExecuteTimer();
        }
        catch (Exception e)
        {
            LogHelper.Logger.Error("Guid文件解析失败，请检查配置！", e);
            //LogHelper.LogException(e);
            //throw new Exception($"Guid文件解析失败，请检查配置！（{e.Message}）");
        }
    }

    /// <summary>
    /// 执行定时器
    /// </summary>
    private void ExecuteTimer()
    {
        if (_timer != null)
        {
            _timer.Stop();
            _timer.Close();
            _timer = null;
        }
        //分钟转换成毫秒
        var interval = Convert.ToDouble(Interval * 60 * 1000);
        _timer = new Timer(interval);
        _timer.Elapsed += Save;
        _timer.Enabled = true;
        _timer.AutoReset = true;
        _timer.Start();
    }

    /// <summary>
    /// 定时保存数据
    /// </summary>
    /// <param name="source"></param>
    /// <param name="ev"></param>
    private void Save(object source, ElapsedEventArgs ev)
    {
        if (!HasChanged)
            return;
        if (RecordIddDictionary == null)
            return;

        var str = "";
        foreach (var dic in RecordIddDictionary)
        {
            var record = dic.Value;
            str += $"<Guid type=\"{record.IdType}\" step=\"{record.Step}\" last-id=\"{record.LastId}\" last-date=\"{record.LastDate}\"></Guid>";
        }
        str = $"<Guids>{str}</Guids>";
        try
        {
            var xDoc = new XmlDocument { InnerXml = str };
            xDoc.Save(FileName);
        }
        catch (Exception e)
        {
            LogHelper.LogException(e);
        }

        HasChanged = false;
    }
}