using System;
using System.Diagnostics;
using System.Drawing;
using System.IO;
using System.IO.Compression;
using System.Reflection;
using System.Security.Cryptography;
using System.Windows.Forms;
using System.Xml;
using UpTool2.Tool;
using UpToolLib;
using UpToolLib.Tool;

namespace UpTool2
{
    internal static class Program
    {
        public static Form Splash;
        private static int _splashProgress;
        private static string _splashMessage;
        public static bool Online;

        [STAThread]
        private static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            BuildSplash();
            Splash.Show();
            //new Thread(() => { Splash.ShowDialog(); }).Start();
            try
            {
                MutexLock.Lock();
            }
            catch (MutexLockLockedException)
            {
                Console.WriteLine("Mutex property of other process, quitting");
                Process[] processes = Process.GetProcessesByName("UpTool2");
                if (processes.Length > 0)
                    WindowHelper.BringProcessToFront(Process.GetProcessesByName("UpTool2")[0]);
                return;
            }
#if !DEBUG
            try
            {
#endif
                ExternalFunctionalityManager.Init(new UtLibFunctions());
                SetSplash(1, "Initializing paths");
                if (!Directory.Exists(PathTool.Dir))
                    Directory.CreateDirectory(PathTool.Dir);
                FixXml();
                SetSplash(2, "Performing checks");
                try
                {
                    UpToolLib.UpdateCheck.Reload();
                    Online = true;
                }
                catch
                {
                    Online = false;
                }
                if (Application.ExecutablePath != PathTool.GetRelative("Install", "UpTool2.dll"))
                    Splash.Invoke((Action) (() => MessageBox.Show(Splash,
                            $"WARNING!{Environment.NewLine}Running from outside the install directory is not recommended!")
                        ));
                if (!Directory.Exists(PathTool.GetRelative("Apps")))
                    Directory.CreateDirectory(PathTool.GetRelative("Apps"));
                if (!Online)
                    SetSplash(7, "Opening");
                if (!Online || UpdateCheck())
                    Application.Run(new MainForm());
#if !DEBUG
            }
            catch (Exception e1)
            {
                try
                {
                    Splash.Invoke((Action) Splash.Hide);
                }
                catch
                {
                    Console.WriteLine("Failed to hide splash");
                }
                MessageBox.Show(e1.ToString());
            }
            finally
            {
                MutexLock.Unlock();
            }
#endif
        }

        private static void BuildSplash()
        {
            Splash = new Form
            {
                StartPosition = FormStartPosition.CenterScreen,
                FormBorderStyle = FormBorderStyle.None,
                ControlBox = false,
                MaximizeBox = false,
                MinimizeBox = false,
                ShowIcon = false,
                ShowInTaskbar = false,
                Size = new Size(700, 400),
                BackColor = Color.Black
            };
            Splash.MaximumSize = Splash.Size;
            Splash.MinimumSize = Splash.Size;
            Splash.Paint += (sender, e) =>
            {
                Graphics g = e.Graphics;
                //Draw background
                Brush[] brushes =
                    {Brushes.Purple, Brushes.MediumPurple, Brushes.Indigo, Brushes.Fuchsia, Brushes.OrangeRed};
                const int barWidth = 50;
                const int topOffset = 100;
                for (int i = 0; i < Splash.Width + topOffset; i += barWidth)
                    g.FillPolygon(brushes[i / barWidth % brushes.Length], new[]
                    {
                        new PointF(i, 0),
                        new PointF(i + barWidth, 0),
                        new PointF(i, Splash.Height),
                        new PointF(i - topOffset, Splash.Height)
                    });
                //Draw Text: UpTool2 (by JFronny)^
                Font font = new Font(FontFamily.GenericSansSerif, 40, FontStyle.Bold);
                const string text = "UpTool2";
                SizeF size = g.MeasureString(text, font);
                RectangleF rect = new RectangleF(Splash.Width / 2f - size.Width / 2,
                    Splash.Height / 2f - size.Height / 2, size.Width, size.Height);
                g.DrawString(text, font, Brushes.White, rect);
                Font smallFont = new Font(FontFamily.GenericSansSerif, 10);
                const string subtitle = "by JFronny";
                SizeF size2 = g.MeasureString(subtitle, smallFont);
                g.DrawString(subtitle, smallFont, Brushes.White,
                    new RectangleF(rect.Right - size2.Width, rect.Bottom - size2.Height, size2.Width, size2.Height));
                //Draw progress bar
                Rectangle bar = new Rectangle(3 * Splash.Width / 8, Splash.Height * 3 / 4 - 10, Splash.Width / 4,
                    20);
                g.FillRectangle(Brushes.Gray, bar);
                g.FillRectangle(Brushes.Black,
                    new Rectangle(bar.X, bar.Y, bar.Width * _splashProgress / 10, bar.Height));
                g.DrawRectangle(Pens.DimGray, bar);
                //g.DrawString(SplashMessage, smallFont, Brushes.White, new PointF(bar.Left, bar.Bottom));
                g.DrawString(_splashMessage, smallFont, Brushes.White, bar,
                    new StringFormat {Alignment = StringAlignment.Near, LineAlignment = StringAlignment.Center});
            };
            int xOff = 0;
            int yOff = 0;
            bool moving = false;
            Splash.MouseDown += (sender, e) =>
            {
                moving = true;
                xOff = e.X;
                yOff = e.Y;
            };
            Splash.MouseUp += (sender, e) => moving = false;
            Splash.MouseMove += (sender, e) =>
            {
                if (!moving) return;
                Splash.Left = Cursor.Position.X - xOff;
                Splash.Top = Cursor.Position.Y - yOff;
            };
            Splash.Load += (sender, e) => Splash.BringToFront();
            Splash.FormClosed += (sender, e) => Splash.Dispose();
        }

        public static void SetSplash(int progress, string status) => Splash.Invoke(new Action(() =>
        {
            _splashProgress = progress;
            Console.WriteLine(status);
            _splashMessage = status;
            Splash.Invoke((Action) Splash.Invalidate);
        }));

        public static void FixXml(bool throwOnError = false)
        {
            try
            {
                XmlTool.FixXml();
            }
            catch (XmlException)
            {
                if (throwOnError) throw;
                MessageBox.Show("Something went wrong while trying to parse XML. Retrying...");
                File.Delete(PathTool.InfoXml);
                FixXml();
            }
        }

        private static bool UpdateCheck()
        {
            SetSplash(3, "Comparing online version");
            if (Assembly.GetExecutingAssembly().GetName().Version >= UpToolLib.UpdateCheck.OnlineVersion)
                return true;
            byte[] dl;
            SetSplash(4, "Downloading latest");
            using (DownloadDialog dlg = new DownloadDialog(UpToolLib.UpdateCheck.Installer.AbsoluteUri))
            {
                if (dlg.ShowDialog() != DialogResult.OK)
                    throw new Exception("Failed to update");
                dl = dlg.Result;
            }
            SetSplash(8, "Verifying");
            using (SHA256CryptoServiceProvider sha256 = new SHA256CryptoServiceProvider())
            {
                string pkgHash = BitConverter.ToString(sha256.ComputeHash(dl)).Replace("-", string.Empty).ToUpper();
                if (pkgHash != UpToolLib.UpdateCheck.InstallerHash)
                    throw new Exception(
                        $"The hash is not equal to the one stored in the repo:\r\nPackage: {pkgHash}\r\nOnline: {UpToolLib.UpdateCheck.InstallerHash}");
            }
            SetSplash(9, "Installing");
            if (Directory.Exists(PathTool.GetRelative("Install", "tmp")))
                Directory.Delete(PathTool.GetRelative("Install", "tmp"), true);
            Directory.CreateDirectory(PathTool.GetRelative("Install", "tmp"));
            using (MemoryStream ms = new MemoryStream(dl))
            {
                using ZipArchive ar = new ZipArchive(ms);
                ar.ExtractToDirectory(PathTool.GetRelative("Install", "tmp"), true);
            }
            Splash.Hide();
            Process.Start(new ProcessStartInfo
            {
                FileName = PathTool.GetRelative("Install", "tmp", "Installer.exe"),
                Arguments = "i -p",
                CreateNoWindow = true,
                WindowStyle = ProcessWindowStyle.Hidden,
                WorkingDirectory = PathTool.GetRelative("Install")
            });
            return false;
        }
    }
}