using System;
using System.Collections.Generic;
using System.IO;
using Xunit;
using XWorld.Framework;
using XWorld.Server.Host;

namespace XWorld.Server.Host.Tests
{
    public class FrameworkVersionGateTests
    {
        private static readonly IReadOnlyList<PlayerInfo> Players = new[]
        {
            new PlayerInfo { PlayerId = 1, Name = "Human", IsAI = false },
            new PlayerInfo { PlayerId = -1, Name = "AI",   IsAI = true  },
        };

        [Fact]
        public void Load_GameWithinFrameworkVersion_Loads()
        {
            // RPS game.json has minFrameworkVersion=1 == FrameworkInfo.Version (1 > 1 is false → loads)
            var module = new GameModuleLoader().Load(TestGames.Root, "rps", 1);
            Assert.Equal("rps", module.GameId);
            Assert.Equal(1, module.Version);
            IGameServerRoom room = module.CreateRoom();
            Assert.NotNull(room);
        }

        [Fact]
        public void Load_GameRequiresNewerFramework_Rejected()
        {
            string tempRoot = Path.Combine(Path.GetTempPath(), "FrameworkGateTest_" + Guid.NewGuid().ToString("N"));
            string tempModuleDir = Path.Combine(tempRoot, "rps", "1");
            Directory.CreateDirectory(tempModuleDir);
            try
            {
                // Copy RPS DLLs and game.json from the real TestGames fixture
                string srcDir = Path.Combine(TestGames.Root, "rps", "1");
                foreach (var file in Directory.GetFiles(srcDir))
                    File.Copy(file, Path.Combine(tempModuleDir, Path.GetFileName(file)));

                // Rewrite game.json with minFrameworkVersion > current
                string gameJsonPath = Path.Combine(tempModuleDir, "game.json");
                string original = File.ReadAllText(gameJsonPath);
                string patched = original.Replace(
                    $"\"minFrameworkVersion\": {FrameworkInfo.Version}",
                    $"\"minFrameworkVersion\": {FrameworkInfo.Version + 1}");
                // Fallback: replace numeric value directly if exact string didn't match
                if (patched == original)
                    patched = System.Text.RegularExpressions.Regex.Replace(
                        original,
                        @"""minFrameworkVersion""\s*:\s*\d+",
                        $"\"minFrameworkVersion\": {FrameworkInfo.Version + 1}");
                File.WriteAllText(gameJsonPath, patched);

                var ex = Assert.ThrowsAny<Exception>(
                    () => new GameModuleLoader().Load(tempRoot, "rps", 1));
                Assert.IsType<InvalidOperationException>(ex);
            }
            finally
            {
                Directory.Delete(tempRoot, recursive: true);
            }
        }
    }
}