using System.Diagnostics;
using System.IO;
using System.IO.Compression;
using System.Security.Cryptography;
using Zerolauncher.Defender;

namespace Zerolauncher.Manager
{

    class DownloadTask
    {
        public static bool state = false;
        public static string url = "";
    }

    class UpDateManager
    {
        const string cache_file = "cache.zip";
        static bool isCheeking = false;

        public static void DoCheckUpdate(bool checkMain=true, bool needEngine = false)
        {
            if (isCheeking) return;
            isCheeking=true;
            bool needMian= false;
            if(checkMain)
            {
                string filePath = Process.GetCurrentProcess().MainModule.FileName;
                string? now_bit;
                using (SHA256 sha256 = SHA256.Create())
                {
                    using (FileStream fileStream = File.OpenRead(filePath))
                    {
                        byte[] hashBytes = sha256.ComputeHash(fileStream);
                        now_bit = BitConverter.ToString(hashBytes).Replace("-", string.Empty);
                    }
                }
                needMian = now_bit == CacheSha.GetM() && now_bit != null;
            }
            if(!needEngine) 
            {
                string? now_bit;
                using (SHA256 sha256 = SHA256.Create())
                {
                    using (FileStream fileStream = File.OpenRead(@"ZeroEngine.exe"))
                    {
                        byte[] hashBytes = sha256.ComputeHash(fileStream);
                        now_bit = BitConverter.ToString(hashBytes).Replace("-", string.Empty);
                    }
                }
                needEngine = now_bit == CacheSha.GetE() && now_bit != null;
            }
            if(needEngine && needMian) { isCheeking = false;  return; }
            DownloadTask.state = true;
            if(needEngine == needMian) DownloadTask.url = UpDateData.full_packet_url;
            else DownloadTask.url = UpDateData.mini_packet_url;
            isCheeking = false;
        }

        public static void OnDownLoadDone()
        {
            ZipFile.ExtractToDirectory(cache_file, ".");
            Process.Start("./upacket.bin");
        }

    }
}