using System;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using XWorld.Server.Gateway;

namespace XWorld.Server.Cdn.Runner
{
    // 独立内网 CDN（HTTP 静态文件服务）。仿 Gateway.Runner 形态。
    // 用法: dotnet run --project Server/Cdn.Runner -- --root <发布产物>/client --port 15081 --lan
    public static class Program
    {
        public static async Task Main(string[] args)
        {
            string root = GetArg(args, "--root");
            if (string.IsNullOrWhiteSpace(root))
            {
                Console.Error.WriteLine("缺少必填参数 --root <目录>（指向发布产物 client/ 目录，含 minigame/<id>/<ver>/...）");
                Environment.ExitCode = 2;
                return;
            }
            root = Path.GetFullPath(root);
            int port = int.TryParse(GetArg(args, "--port"), out int p) ? p : 15081;
            bool lan = Array.Exists(args, a => string.Equals(a, "--lan", StringComparison.OrdinalIgnoreCase));

            var cdn = new StaticFileServer(root, port, bindAllInterfaces: lan);
            await cdn.StartAsync();

            string advertiseHost = lan ? LanIp.Resolve() : "127.0.0.1";
            Console.WriteLine("XWorld CDN static file server started.");
            Console.WriteLine("  root: " + root);
            Console.WriteLine("  listen: " + cdn.HttpBaseUrl + (lan ? "  (all interfaces)" : "  (loopback)"));
            Console.WriteLine("  advertise cdn root: http://" + advertiseHost + ":" + port + "/  (XWorld/<platform>/ , minigame/<id>/<ver>/)");
            Console.WriteLine("Press Ctrl+C to stop.");

            using var stop = new CancellationTokenSource();
            Console.CancelKeyPress += (s, e) =>
            {
                e.Cancel = true;
                stop.Cancel();
            };

            try { await Task.Delay(Timeout.InfiniteTimeSpan, stop.Token); }
            catch (OperationCanceledException) { }
            await cdn.StopAsync();
        }

        private static string GetArg(string[] args, string name)
        {
            for (int i = 0; i < args.Length - 1; i++)
                if (string.Equals(args[i], name, StringComparison.OrdinalIgnoreCase))
                    return args[i + 1];
            return null;
        }
    }
}