using Common;
using Infrastructure;
using Nacos.V2;
using Nacos.V2.DependencyInjection;
using Yarp.ReverseProxy.Configuration;

public class RefreshYarp : BackgroundService
{
    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        while (!stoppingToken.IsCancellationRequested)
        {
            try
            {
                // 例如后台定时任务 / Nacos 监听回调里
                var provider = App.ServiceProvider.GetRequiredService<InMemoryConfigProvider>();

                var clusters = new List<ClusterConfig>();
                var routes   = new List<RouteConfig>();            
                var services = new ServiceCollection();
                services.AddNacosV2Naming(x =>
                {
                    InternalApp.Configuration.GetSection("NacosConfig").Bind(x);
                });
                var sp = services.BuildServiceProvider();
                var naming = sp.GetRequiredService<INacosNamingService>();

                var options = App.OptionsSetting;
                foreach(var service in options.Services)
                {
                    string serviceName = service.Name;
                    var list = await naming.GetAllInstances(serviceName, "DEFAULT");
                    var healthy = list.Where(h => h.Healthy && h.Enabled).ToList();

                    if (healthy.Count > 0)
                    {
                        var dests = healthy.ToDictionary(
                            k => $"{k.Ip}:{k.Port}",
                            v => new DestinationConfig { Address = $"http://{v.Ip}:{v.Port}" });

                        Console.WriteLine("serviceHosts---" + Newtonsoft.Json.JsonConvert.SerializeObject(dests));

                        string ClusterId = serviceName + "-cluster";
                        string RouteId = serviceName + "-route";
                        if(!clusters.Any(m => m.ClusterId == ClusterId))
                        {
                            clusters.Add(new ClusterConfig
                            {
                                ClusterId = ClusterId,
                                Destinations = dests
                            });
                        }
                        else
                        {
                            RouteId += "-" + routes.Count(m => m.ClusterId == ClusterId);
                        }
                        routes.Add(new RouteConfig
                        {
                            RouteId = RouteId,
                            ClusterId = ClusterId,
                            Match = new RouteMatch { Path = service.Path }
                        });
                    }
                }

                // 一键生效，不需要重启
                provider.Update(routes, clusters);
            }
            catch(Exception ex)
            {
                Utils.WriteLog(ex.ToString(), "实时同步nacos服务数据异常");
            }
            await Task.Delay(10000, stoppingToken);
        }
    }
}