using System;
using System.ComponentModel;
using System.Diagnostics;
using System.IO;
using System.Net.Http;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using IWshRuntimeLibrary;
using Microsoft.Win32;
using Newtonsoft.Json.Linq;
using OnaCore;
using Sheas_Cealer.Consts;
using Sheas_Cealer.Preses;
using Sheas_Cealer.Utils;
using File = System.IO.File;

namespace Sheas_Cealer.Wins
{
    public partial class MainWin : Window
    {
        private static string CealArgs = string.Empty;
        private static readonly HttpClient MainClient = new();
        private static readonly FileSystemWatcher CealingHostWatcher = new(AppDomain.CurrentDomain.SetupInformation.ApplicationBase!, "Cealing-Host.json") { EnableRaisingEvents = true, NotifyFilter = NotifyFilters.LastWrite };
        private static MainPres? MainPres;
        private static readonly MainConst MainConst = new();

        internal MainWin(string[] args)
        {
            InitializeComponent();

            MainPres = new(args);
            DataContext = MainPres;

            Task.Run(() =>
            {
                CealingHostWatcher.Changed += CealingHostWatcher_Changed;
                CealingHostWatcher_Changed(null!, null!);
            });
        }
        private void MainWin_Loaded(object sender, RoutedEventArgs e) => MainPres!.IsContentBoxFocused = true;
        private void MainWin_Closing(object sender, CancelEventArgs e) => Environment.Exit(0);

        private void MainWin_DragEnter(object sender, DragEventArgs e)
        {
            if (e.Data.GetDataPresent(DataFormats.FileDrop))
                e.Effects = DragDropEffects.Link;
            else
                e.Effects = DragDropEffects.None;

            e.Handled = true;
        }
        private void MainWin_Drop(object sender, DragEventArgs e)
        {
            if (e.Data.GetDataPresent(DataFormats.FileDrop))
                MainPres!.BrowserPath = ((string[])e.Data.GetData(DataFormats.FileDrop))[0];
        }

        private void ContentBox_TextChanged(object sender, TextChangedEventArgs e)
        {
            TextBox? ContentBox = sender as TextBox;

            if (MainPres!.Mode == MainConst.Mode.browserPathMode)
                MainPres.BrowserPath = ContentBox!.Text;
            else if (MainPres!.Mode == MainConst.Mode.upstreamUrlMode)
                MainPres.UpstreamUrl = ContentBox!.Text;
            else if (MainPres!.Mode == MainConst.Mode.extraArgsMode)
                MainPres.ExtraArgs = ContentBox!.Text;
            else
                throw new UnreachableException();
        }
        private void BrowseButton_Click(object sender, RoutedEventArgs e)
        {
            OpenFileDialog openFileDialog = new() { Filter = "浏览器 (*.exe)|*.exe" };

            if (openFileDialog.ShowDialog() == true)
            {
                MainPres!.IsContentBoxFocused = true;
                MainPres!.BrowserPath = openFileDialog.FileName;
            }
        }
        private void SwitchModeButton_Click(object sender, RoutedEventArgs e)
        {
            if (MainPres!.Mode == MainConst.Mode.browserPathMode)
                MainPres!.Mode = MainConst.Mode.upstreamUrlMode;
            else if (MainPres!.Mode == MainConst.Mode.upstreamUrlMode)
                MainPres!.Mode = MainConst.Mode.extraArgsMode;
            else if (MainPres!.Mode == MainConst.Mode.extraArgsMode)
                MainPres!.Mode = MainConst.Mode.browserPathMode;
        }

        private void StartCealButton_Click(object sender, RoutedEventArgs e)
        {
            if (string.IsNullOrWhiteSpace(CealArgs))
                throw new Exception("规则无法识别，请检查伪造规则是否含有语法错误");
            if (MessageBox.Show("启动前将关闭所选浏览器的所有进程，是否继续？", string.Empty, MessageBoxButton.YesNo) != MessageBoxResult.Yes)
                return;

            IWshShortcut uncealedBrowserShortcut = (IWshShortcut)new WshShell().CreateShortcut(Path.Combine(AppDomain.CurrentDomain.SetupInformation.ApplicationBase!, @"Uncealed-Browser.lnk"));
            uncealedBrowserShortcut.TargetPath = MainPres!.BrowserPath;
            uncealedBrowserShortcut.Description = "Created By Sheas Cealer";
            uncealedBrowserShortcut.Save();

            foreach (Process browserProcess in Process.GetProcessesByName(Path.GetFileNameWithoutExtension(MainPres!.BrowserPath)))
            {
                browserProcess.Kill();
                browserProcess.WaitForExit();
            }

            new Command().ShellRun(AppDomain.CurrentDomain.SetupInformation.ApplicationBase!, CealArgs + " " + MainPres!.ExtraArgs);
        }

        private void EditHostButton_Click(object sender, RoutedEventArgs e)
        {
            ProcessStartInfo processStartInfo = new(Path.Combine(AppDomain.CurrentDomain.SetupInformation.ApplicationBase!, @"Cealing-Host.json")) { UseShellExecute = true };
            Process.Start(processStartInfo);
        }
        private async void UpdateHostButton_Click(object sender, RoutedEventArgs e)
        {
            string hostUrl = MainPres!.UpstreamUrl;
            string UpdateHostString = await Http.GetAsync<string>(hostUrl, MainClient);
            StreamReader hostLocalStreamReader = new(Path.Combine(AppDomain.CurrentDomain.SetupInformation.ApplicationBase!, @"Cealing-Host.json"));
            string hostLocalString = hostLocalStreamReader.ReadToEnd();
            hostLocalStreamReader.Close();

            if (MainConst.HostRegex().Replace(hostLocalString, string.Empty) == UpdateHostString)
                MessageBox.Show("本地伪造规则和上游一模一样");
            else
            {
                MessageBoxResult overrideResult = MessageBox.Show("本地伪造规则和上游略有不同，需要覆盖本地吗? 否则只为你打开上游规则的网页", string.Empty, MessageBoxButton.YesNoCancel);
                if (overrideResult == MessageBoxResult.Yes)
                {
                    File.WriteAllText(Path.Combine(AppDomain.CurrentDomain.SetupInformation.ApplicationBase!, @"Cealing-Host.json"), UpdateHostString);
                    MessageBox.Show("更新已完成");
                }
                else if (overrideResult == MessageBoxResult.No)
                    Process.Start(new ProcessStartInfo(hostUrl) { UseShellExecute = true });
            }
        }
        private void AboutButton_Click(object sender, RoutedEventArgs e)
        {
            new AboutWin().ShowDialog();
        }

        private void CealingHostWatcher_Changed(object sender, FileSystemEventArgs e)
        {
            try
            {
                string hostRules = string.Empty, hostResolverRules = string.Empty;
                int ruleIndex = 0;
                FileStream hostStream = new(Path.Combine(AppDomain.CurrentDomain.SetupInformation.ApplicationBase!, @"Cealing-Host.json"), FileMode.OpenOrCreate, FileAccess.Read, FileShare.ReadWrite | FileShare.Delete);
                JArray hostJArray = JArray.Parse(new StreamReader(hostStream).ReadToEnd());

                foreach (var hostJToken in hostJArray)
                {
                    if (string.IsNullOrWhiteSpace(hostJToken[1]!.ToString()))
                        hostJToken[1] = "c" + ruleIndex;

                    foreach (var hostName in hostJToken[0]!)
                    {
                        if (hostName != hostJToken[1])
                            hostRules += "MAP " + hostName + " " + hostJToken[1] + ",";
                    }

                    hostResolverRules += "MAP " + hostJToken[1] + " " + hostJToken[2] + ",";

                    ++ruleIndex;
                }

                CealArgs = @"/c @start .\""Uncealed-Browser.lnk"" --host-rules=""" + hostRules[0..^1] + @""" --host-resolver-rules=""" + hostResolverRules[0..^1] + @""" --ignore-certificate-errors " + MainPres!.ExtraArgs;
            }
            catch { CealArgs = string.Empty; }
        }
        private void MainWin_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyboardDevice.Modifiers == ModifierKeys.Control && e.Key == Key.W)
                Environment.Exit(0);
        }
    }
}