using System;
using Xunit;
using XWorld.Framework.Protocol;

namespace XWorld.Framework.Tests
{
    public class DevDiscoveryCodecTests
    {
        [Fact]
        public void Query_RoundTrips()
        {
            var q = new DevDiscoveryQuery { ProtoVersion = DevDiscovery.ProtoVersion, Nonce = 0xABCDEF, Token = "dev-token" };
            byte[] bytes = DevDiscoveryCodec.EncodeQuery(q);
            Assert.True(DevDiscoveryCodec.TryDecodeQuery(bytes, out var got));
            Assert.Equal(q.ProtoVersion, got.ProtoVersion);
            Assert.Equal(q.Nonce, got.Nonce);
            Assert.Equal(q.Token, got.Token);
        }

        [Fact]
        public void Reply_RoundTrips()
        {
            var reply = new DevDiscoveryReply
            {
                ProtoVersion = DevDiscovery.ProtoVersion,
                Nonce = 42,
                ServerName = "dev-pc",
                GatewayUrl = "ws://192.168.1.23:5005/ws",
                ResourceBaseUrl = "http://192.168.1.23:15081/minigame/",
                Token = "dev-token",
            };
            byte[] bytes = DevDiscoveryCodec.EncodeReply(reply);
            Assert.True(DevDiscoveryCodec.TryDecodeReply(bytes, out var got));
            Assert.Equal(reply.GatewayUrl, got.GatewayUrl);
            Assert.Equal(reply.ResourceBaseUrl, got.ResourceBaseUrl);
            Assert.Equal(reply.ServerName, got.ServerName);
            Assert.Equal(reply.Nonce, got.Nonce);
            Assert.Equal(reply.Token, got.Token);
        }

        [Fact]
        public void BadMagic_Rejected()
        {
            byte[] bytes = { 0x00, 0x01, 0x02, 0x03, DevDiscovery.TypeQuery, 1 };
            Assert.False(DevDiscoveryCodec.TryDecodeQuery(bytes, out _));
        }

        [Fact]
        public void Truncated_Rejected()
        {
            Assert.False(DevDiscoveryCodec.TryDecodeQuery(new byte[] { 0x58, 0x57 }, out _));
            Assert.False(DevDiscoveryCodec.TryDecodeReply(Array.Empty<byte>(), out _));
        }

        [Fact]
        public void WrongType_Rejected()
        {
            var q = new DevDiscoveryQuery { ProtoVersion = 1, Nonce = 1, Token = "t" };
            byte[] queryBytes = DevDiscoveryCodec.EncodeQuery(q);
            Assert.False(DevDiscoveryCodec.TryDecodeReply(queryBytes, out _));
        }
    }
}