using System.Net;
using Microsoft.AspNetCore.Connections;

namespace PCC.Common.Networking;

public class KestrelTcpServer(string ip, int port, ConnectionDelegate connectionHandler, ILogger<KestrelTcpServer> logger)
{
    private IHost? _host;

    public async Task StartAsync(CancellationToken cancellationToken = default)
    {
        if (_host != null)
        {
            throw new InvalidOperationException("Server is already running.");
        }

        _host = Host.CreateDefaultBuilder()
            .ConfigureLogging(logging =>
            {
                logging.ClearProviders(); // 清除默认日志提供者（可选）
                logging.AddProvider(new LoggerProvider(logger)); // 添加自定义日志提供者
            })
            .ConfigureWebHostDefaults(webBuilder =>
            {
                webBuilder
                    .UseUrls() //消除警告 Microsoft.AspNetCore.Server.Kestrel[0] Overriding address(es) 'https://localhost:5001/, http://localhost:5000/'. Binding to endpoints defined via IConfiguration and/or UseKestrel() instead.
                    .Configure(app =>
                    {
                        // 防止启动时报错 No application configured

                        // 没用🙄 无法取消日志 No action descriptors found. This may indicate an incorrectly configured application or missing application parts. To learn more, visit https://aka.ms/aspnet/mvc/app-parts
                        //app.Use(async (HttpContext context, RequestDelegate next) => context.Response.WriteAsync("Hello from Kestrel!"));
                    })
                    .UseKestrel(kop =>
                    {
                        kop.Listen(IPAddress.Parse(ip), port, lop =>
                        {
                            lop.Use(async (ConnectionContext context, ConnectionDelegate next) => await connectionHandler(context));
                        });
                    });
            })
            .Build();

        await _host.StartAsync(cancellationToken);

    }

    public async Task StopAsync(CancellationToken cancellationToken = default)
    {
        if (_host == null)
            throw new InvalidOperationException("Server is not running.");

        await _host.StopAsync(cancellationToken);
        Console.WriteLine("Server stopped.");
        _host = null;
    }

    // 示例自定义日志提供者（可根据需求自定义实现）
    private class LoggerProvider(ILogger logger) : ILoggerProvider
    {
        public ILogger CreateLogger(string categoryName)
        {
            return new CustomLogger(logger, categoryName);
        }

        public void Dispose()
        {
            // 处理必要的清理 这里没有
        }
    }

    private class CustomLogger(ILogger logger, string categoryName) : ILogger
    {
        public IDisposable? BeginScope<TState>(TState state) where TState : notnull => logger.BeginScope(state);

        public bool IsEnabled(LogLevel logLevel) => logger.IsEnabled(logLevel);

        public void Log<TState>(LogLevel logLevel, EventId eventId, TState state, Exception exception, Func<TState, Exception, string> formatter)
        {
            if (formatter == null) return;
            logger.Log(logLevel, eventId, categoryName + ": " + formatter(state, exception), exception);
        }
    }
}