using System;
using System.ComponentModel;
using System.IO;
using System.Net;


namespace Mitria_Minecraft_Launcher
{
    public class Downloader
    {
        private static int BufferSize = 1024 * 1240 * 1; //1MB

        public delegate void DownloaderProgressChangedEventHandler(object sender, DownloaderProgressChangedEventArgs downloaderProgressChangedEventArgs);
        public event DownloaderProgressChangedEventHandler DownloaderProgressChangedEvent;

        public void DownloadFile(string url, string path)
        {
            HttpWebRequest request = WebRequest.CreateHttp(url);
            WebResponse response = request.GetResponse();
            long fileSize = long.Parse(response.Headers.Get("Content-Length"));

            Stream webStream = response.GetResponseStream();
            Stream fileStream = File.Open(path, FileMode.Create);

            byte[] buffer = new byte[BufferSize];
            int length = 0;
            int processedByte = 0;
            while ((length = webStream.Read(buffer, 0, BufferSize)) > 0)
            {
                fileStream.Write(buffer, 0, length);

                processedByte += length;
                var e = new DownloaderProgressChangedEventArgs(processedByte, fileSize);
                DownloaderProgressChangedEvent?.Invoke(this, e);
            }

            webStream.Dispose();
            fileStream.Dispose();
        }

        public string DownloadString(string url)
        {
            try
            {
                HttpWebRequest request = WebRequest.CreateHttp(url);
                WebResponse response = request.GetResponse();

                StreamReader streamReader = new StreamReader(response.GetResponseStream());
                string resultString = streamReader.ReadToEnd();
                streamReader.Close();

                return resultString;
            }
            catch (WebException ex)
            {
                switch (ex.Status)
                {
                    case WebExceptionStatus.ConnectFailure:
                        CommonLibrary.Log.FATAL("ConnectFailure : " + url);
                        break;
                    case WebExceptionStatus.Timeout:
                        CommonLibrary.Log.FATAL("TimeOut : " + url);
                        break;
                    case WebExceptionStatus.ProtocolError:
                        CommonLibrary.Log.FATAL("Not Found Page : " + url);
                        break;
                    default:
                        break;

                }
                return string.Empty;
            }
        }
    }
    public class DownloaderProgressChangedEventArgs : EventArgs
    {
        public long ProcessedByte { get; set; }
        public long FileSize { get; set; }
        public DownloaderProgressChangedEventArgs(long processByte, long fileSize)
        {
            ProcessedByte = processByte;
            FileSize = fileSize;
        }
    }

}