using System;
using System.IO;
using System.Net;
using System.Diagnostics;
using System.Windows.Forms;
using System.ComponentModel;

namespace Custom_Installer
{
    class Download
    {
        private Stopwatch DownloadTimer;
        public String SavePath { get; set; }
        public Uri Address { get; set; }
        public ProgressBar Progress { get; set; }
        public Label Information { get; set; }
        public Boolean IsFinished;

        public void StartDownload()
        {
            try
            {
                WebClient DownloadClient = new WebClient();
                DownloadClient.DownloadFileCompleted += DownloadClient_DownloadFileCompleted;
                DownloadClient.DownloadProgressChanged += DownloadClient_DownloadProgressChanged;

                DownloadTimer = new Stopwatch();
                DownloadTimer.Start();

                DownloadClient.DownloadFileAsync(Address, SavePath);
            }
            catch (Exception Error)
            {
                File.Delete(String.Format("{0}{1}", String.Format(Properties.Settings.Default.Save_Location, Properties.Settings.Default.Server_Name), Properties.Settings.Default.Extract_Name));

                Program.Message(Error.Message);
                Program.Shutdown();
            }
        }

        private void DownloadClient_DownloadProgressChanged(Object Sender, DownloadProgressChangedEventArgs Args)
        {
            Int64 Completed = Args.BytesReceived;
            Int64 FileSize = Args.TotalBytesToReceive;
            Int32 ProgressPercentage = Args.ProgressPercentage;

            String Speed = String.Format("{0} KB/s", (Completed / 1024d / DownloadTimer.Elapsed.TotalSeconds).ToString("0.00"));

            if (Progress != null) { Progress.BeginInvoke((Action)(() => { Progress.Value = ProgressPercentage; })); }
            if (Information != null) { Information.BeginInvoke((Action)(() => { Information.Text = String.Format("Downloading: {0}% [{1}/{2}]   {3}", ProgressPercentage, ConvertBytes(Completed), ConvertBytes(FileSize), Speed); })); }
        }

        private void DownloadClient_DownloadFileCompleted(Object Sender, AsyncCompletedEventArgs Args)
        {
            if (Progress != null) { Progress.BeginInvoke((Action)(() => { Progress.Value = 100; })); }
            if (Information != null) { Information.BeginInvoke((Action)(() => { Information.Text = "Downloaded Successfully"; })); }

            IsFinished = true;
        }

        static String ConvertBytes(Int64 Amount)
        {
            String[] Suffix = { "B", "KB", "MB", "GB", "TB", "PB", "EB" };

            Int64 Bytes = Math.Abs(Amount);

            Int32 Place = Convert.ToInt32(Math.Floor(Math.Log(Bytes, 1024)));

            Double Number = Math.Round(Bytes / Math.Pow(1024, Place), 1);

            return String.Format("{0} {1}", Convert.ToString(Math.Sign(Amount) * Number), Suffix[Place]);
        }
    }
}