using System;
using System.IO;
using System.Net;
using System.Net.Http;
using System.Threading.Tasks;
using Xunit;
using XWorld.Server.Gateway;

namespace XWorld.Server.Gateway.Tests
{
    public class StaticFileServerTests
    {
        [Fact]
        public async Task ServesExistingFile_200_WithExactBytes()
        {
            string root = Path.Combine(Path.GetTempPath(), "xw-cdn-" + Guid.NewGuid().ToString("N"));
            Directory.CreateDirectory(Path.Combine(root, "minigame", "rps", "2"));
            byte[] payload = new byte[] { 1, 2, 3, 4, 250, 99, 0, 7 };
            File.WriteAllBytes(Path.Combine(root, "minigame", "rps", "2", "files.txt"), payload);

            var cdn = new StaticFileServer(root, port: 0);
            await cdn.StartAsync();
            try
            {
                using var http = new HttpClient();
                HttpResponseMessage res = await http.GetAsync($"{cdn.HttpBaseUrl}/minigame/rps/2/files.txt");
                Assert.Equal(HttpStatusCode.OK, res.StatusCode);
                byte[] got = await res.Content.ReadAsByteArrayAsync();
                Assert.Equal(payload, got);
            }
            finally
            {
                await cdn.StopAsync();
                try { Directory.Delete(root, true); } catch { }
            }
        }

        [Fact]
        public async Task MissingFile_404()
        {
            string root = Path.Combine(Path.GetTempPath(), "xw-cdn-" + Guid.NewGuid().ToString("N"));
            var cdn = new StaticFileServer(root, port: 0);
            await cdn.StartAsync();
            try
            {
                using var http = new HttpClient();
                HttpResponseMessage res = await http.GetAsync($"{cdn.HttpBaseUrl}/minigame/nope/1/game.json");
                Assert.Equal(HttpStatusCode.NotFound, res.StatusCode);
            }
            finally
            {
                await cdn.StopAsync();
                try { Directory.Delete(root, true); } catch { }
            }
        }

        [Fact]
        public void LanIp_ReturnsNonLoopbackIPv4_OrFallback()
        {
            string ip = LanIp.Resolve();
            Assert.False(string.IsNullOrWhiteSpace(ip));
            Assert.True(System.Net.IPAddress.TryParse(ip, out var parsed));
            Assert.Equal(System.Net.Sockets.AddressFamily.InterNetwork, parsed.AddressFamily);
        }
    }
}