using System;
using System.Threading;
using System.IO;
using System.Net;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace EasyDownloader
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            SaveFileDialog SFD = new SaveFileDialog();
            SFD.Filter = "All files (*.*)|(*.*)";
            SFD.FilterIndex = 1;
            SFD.RestoreDirectory = true;
            SFD.ShowDialog();
            if (SFD.FileName != String.Empty)
            {
                textBox2.Text = SFD.FileName;
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                if (textBox1.Text == String.Empty)
                {
                    throw new RemoteFileEmptyException("Pole URL nie może być puste.");
                }
                if (textBox2.Text == String.Empty)
                {
                    throw new DestinationFileEmptyException("Pole z plikiem docelowym nie może być puste.");
                }
                textBox1.ReadOnly = true;
                string URL = String.Empty;
                string DestFile = String.Empty;
                URL = textBox1.Text;
                DestFile = textBox2.Text;

                Console.ForegroundColor = ConsoleColor.White;
                Console.WriteLine("URL = " + URL);
                Console.WriteLine("DestFile = " + DestFile);
                Console.ForegroundColor = ConsoleColor.Red;
                getFile(URL, DestFile);

                textBox1.ReadOnly = false;
            }
            catch (RemoteFileEmptyException ex)
            {
                MessageBox.Show("Pole URL nie może być puste.", "Błąd", MessageBoxButtons.OK, MessageBoxIcon.Error);
                Console.WriteLine(ex);
            }
            catch (DestinationFileEmptyException ex)
            {
                MessageBox.Show("Pole z plikiem docelowym nie może być puste.", "Błąd", MessageBoxButtons.OK, MessageBoxIcon.Error);
                Console.WriteLine(ex);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex);
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            DialogResult DR = MessageBox.Show("Czy chcesz uruchomić konsolę debugującą?", "Konsola", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
            if (DR == DialogResult.Yes)
            {
                AllocConsole();
            }
            Console.ForegroundColor = ConsoleColor.Red;
        }

        private void getFile(string URL, string DestFile)
        {
            WebClient WC = new WebClient();
            Uri uri = new Uri(URL);
            try
            {
                WC.DownloadProgressChanged += new DownloadProgressChangedEventHandler(client_DownloadProgressChanged);
                WC.DownloadFileCompleted += new AsyncCompletedEventHandler(client_DownloadFileCompleted);
                WC.DownloadFileAsync(uri, DestFile);

                button1.Enabled = false;
            }
            catch (WebException ex)
            {
                MessageBox.Show("Wystąpił błąd podczas pobierania.\nPowodem może być\n- niepoprawny URL\n- niepoprawny plik docelowy\n- plik nie istnieje na serwerze", "Błąd", MessageBoxButtons.OK, MessageBoxIcon.Error);
                Console.WriteLine(ex);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex);
            }
        }
        void client_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
        {
            double bytesIn = double.Parse(e.BytesReceived.ToString());
            double totalBytes = double.Parse(e.TotalBytesToReceive.ToString());
            double percentage = bytesIn / totalBytes * 100;
            progressBar1.Value = int.Parse(Math.Truncate(percentage).ToString());
            label3.Text = bytesIn + "/" + totalBytes + " - " + Math.Round(percentage) + "% ukończono.";
        }
        void client_DownloadFileCompleted(object sender, AsyncCompletedEventArgs e)
        {
            Console.ForegroundColor = ConsoleColor.Green;
            Console.WriteLine("Pobieranie zakończone");
            Console.ForegroundColor = ConsoleColor.Red;
            button1.Enabled = true;
            label3.Text = String.Empty;
            progressBar1.Value = 0;
            MessageBox.Show("Pobieranie ukończone!", "Zakończono", MessageBoxButtons.OK, MessageBoxIcon.Information);
        }

        [DllImport("kernel32.dll")]
        static extern bool AllocConsole();
    }

    public class DestinationFileEmptyException : Exception
    {
        public DestinationFileEmptyException()
        {

        }

        public DestinationFileEmptyException(string message) : base(message)
        {

        }

        public DestinationFileEmptyException(string message, Exception inner) : base(message, inner)
        {

        }
    }

    public class RemoteFileEmptyException : Exception
    {
        public RemoteFileEmptyException()
        {

        }

        public RemoteFileEmptyException(string message) : base(message)
        {

        }

        public RemoteFileEmptyException(string message, Exception inner) : base(message, inner)
        {

        }
    }
}