using System;
using System.Diagnostics;
using System.IO;
using System.Security.Cryptography;
using System.Windows.Forms;

namespace AssemblerCasinoLauncher
{
    static class Program
    {
        const string ExpectedPokerSha256 = "7E7165F5B9287FCF0F7A7E8F526DD23C0DA5F3A6CF72F08D1A40EB548FFCD428";

        [STAThread]
        static void Main()
        {
            var root = AppDomain.CurrentDomain.BaseDirectory;
            // The installed launcher is at the root; developer builds live in dist.
            if (!File.Exists(Path.Combine(root, "bin", "poker.exe")))
            {
                var parent = Directory.GetParent(root.TrimEnd(Path.DirectorySeparatorChar));
                if (parent != null && Directory.Exists(Path.Combine(parent.FullName, "assets")) &&
                    File.Exists(Path.Combine(parent.FullName, "bin", "poker.exe")))
                    root = parent.FullName;
            }
            var game = Path.Combine(root, "bin", "poker.exe");
            if (!File.Exists(game))
            {
                MessageBox.Show("bin\\poker.exe не найден рядом с лаунчером.", "Assembler Casino", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }

            if (!VerifyGame(game))
            {
                MessageBox.Show("bin\\poker.exe был изменен или поврежден. Запуск остановлен.", "Assembler Casino", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }

            Process.Start(new ProcessStartInfo
            {
                FileName = game,
                WorkingDirectory = root,
                UseShellExecute = false
            });
        }

        static bool VerifyGame(string gamePath)
        {
            try
            {
                using (var sha = SHA256.Create())
                using (var stream = File.OpenRead(gamePath))
                {
                    var actual = BitConverter.ToString(sha.ComputeHash(stream)).Replace("-", "");
                    return actual.Equals(ExpectedPokerSha256, StringComparison.OrdinalIgnoreCase);
                }
            }
            catch
            {
                return false;
            }
        }
    }
}