using Microsoft.Extensions.Hosting;
using SJZY.Expand.ABP.Core;
using SJZY.Track.Application.Contract.Events;
using SJZY.Track.Application.Contract.Services;

namespace SJZY.Track.Application.HostServices;

public class RedisHostService : IHostedService
{
    readonly IForewarningCacheService _forewarningCacheService;

    public RedisHostService(IForewarningCacheService forewarningCacheService)
    {
        _forewarningCacheService = forewarningCacheService;
    }

    // todo：redis一旦重启，订阅的频道就会丢失，需要重新订阅
    public Task StartAsync(CancellationToken cancellationToken)
    {
        // 订阅频道
        RedisHelper.Client.Subscribe(GetKey(), Subscribe);
        return Task.CompletedTask;
    }

    public Task StopAsync(CancellationToken cancellationToken)
    {
        RedisHelper.Client.UnSubscribe(GetKey());
        return Task.CompletedTask;
    }

    private void Subscribe(string message, object value)
    {
        if (value is string str)
        {
            // 暂时只处理一个事件，不做反序列化
            //var instance = Newtonsoft.Json.JsonConvert.DeserializeObject<ModifyWarningEvent>(value as string);
            var instance = Newtonsoft.Json.JsonConvert.DeserializeObject<ClearRulCacheEvent>(str);
            if (instance != null)
            {
                _forewarningCacheService.Clear(instance);
            }
        }
    }

    private string GetKey()
    {
        return $"{GlobalConst.PublishNotifyChannelKey}";
    }
}