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

namespace Zerolauncher.Manager
{

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

    class UpDateManager
    {
        public 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 DownLoad(string Url, string FileName, bool has)
        {
            bool Value = false;
            WebResponse response = null;
            Stream stream = null;

            try
            {
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);

                response = request.GetResponse();
                stream = response.GetResponseStream();

                if (!response.ContentType.ToLower().StartsWith("text/"))
                {
                    Value = SaveBinaryFile(response, FileName);

                }

            }
            catch (Exception err)
            {
                string aa = err.ToString();
            }

        }

        private static bool SaveBinaryFile(WebResponse response, string FileName)
        {
            bool Value = true;
            byte[] buffer = new byte[1024];

            try
            {
                if (File.Exists(FileName))
                    File.Delete(FileName);
                Stream outStream = File.Create(FileName);
                Stream inStream = response.GetResponseStream();

                int l;
                do
                {
                    l = inStream.Read(buffer, 0, buffer.Length);
                    if (l > 0)
                        outStream.Write(buffer, 0, l);
                }
                while (l > 0);

                outStream.Close();
                inStream.Close();
            }
            catch
            {
                Value = false;
            }
            return Value;
        }

    }
}