using System.Net.Sockets;
using System.Threading.Tasks;
using Paca.Core.Config;
using Paca.Mobile.Core;
using Paca.Server;
using Xunit;

namespace Paca.Tests.Server;

public class ServerLanBeaconGateTests
{
    [Fact]
    public void Gate238_AppConfig_RemoteAccessPort_Default_52100_Audit()
    {
        var config = new AppConfig();
        Assert.Equal(52100, config.RemoteAccessPort);

        var opts = new ServerOptions();
        Assert.True(opts.EnableLanBeacon);
    }

    [Fact]
    public async Task Gate237_ServerHost_Starts_And_Stops_LanBeaconResponder_Correctly()
    {
        // 고유 UDP 포트를 사용하여 병렬 테스트 충돌 방지
        int testUdpPort = 52199;
        var options = new ServerOptions
        {
            Port = 0,
            Token = "test_token_1234",
            EnableLanBeacon = true,
            BeaconPort = testUdpPort,
            DeviceName = "TestHostPC"
        };

        await using var host = await ServerHost.StartAsync(options);
        Assert.True(host.LanBeaconActive);

        // UdpClient로 Ping을 보내고 Pong 응답 확인
        using var client = new UdpClient();
        var ping = LanDiscoveryMessage.CreatePing("TestMobileClient");
        var pingBytes = System.Text.Encoding.UTF8.GetBytes(ping.ToPayload());
        await client.SendAsync(pingBytes, pingBytes.Length, "127.0.0.1", testUdpPort);

        var receiveTask = client.ReceiveAsync();
        var completed = await Task.WhenAny(receiveTask, Task.Delay(2000));
        Assert.Same(receiveTask, completed);

        var response = await receiveTask;
        var responseText = System.Text.Encoding.UTF8.GetString(response.Buffer);
        var parsed = LanDiscoveryMessage.Parse(responseText);

        Assert.NotNull(parsed);
        Assert.Equal(LanDiscoveryMessageType.Pong, parsed.Type);
        Assert.Equal("TestHostPC", parsed.DeviceName);
        Assert.EndsWith($":{host.Port}", parsed.Endpoint);
    }
}