using System;
using System.IO;
using System.Windows;
using System.Windows.Input;
using Microsoft.Win32;
using CommunityToolkit.Mvvm.Input;
using Wpf.Ui.Controls.Interfaces;
using Wpf.Ui.Mvvm.Contracts;

namespace Bloxstrap.ViewModels
{
    public class MainWindowViewModel
    {
        private readonly Window _window;
        private readonly IDialogService _dialogService;
        private readonly string _originalBaseDirectory = App.BaseDirectory; // we need this to check if the basedirectory changes

        public ICommand CloseWindowCommand => new RelayCommand(CloseWindow);
        public ICommand ConfirmSettingsCommand => new RelayCommand(ConfirmSettings);

        public string ConfirmButtonText => App.IsFirstRun ? "Install" : "Save";

        public MainWindowViewModel(Window window, IDialogService dialogService)
        {
            _window = window;
            _dialogService = dialogService;
        }

        private void CloseWindow() => _window.Close();

        private void ConfirmSettings()
        {
            if (String.IsNullOrEmpty(App.BaseDirectory))
            {
                App.ShowMessageBox("You must set an install location", MessageBoxImage.Error);
                return;
            }

            try
            {
                // check if we can write to the directory (a bit hacky but eh)

                string testPath = App.BaseDirectory;
                string testFile = Path.Combine(testPath, $"{App.ProjectName}WriteTest.txt");
                bool testPathExists = Directory.Exists(testPath);

                if (!testPathExists)
                    Directory.CreateDirectory(testPath);

                File.WriteAllText(testFile, "hi");
                File.Delete(testFile);

                if (!testPathExists)
                    Directory.Delete(testPath);
            }
            catch (UnauthorizedAccessException)
            {
                App.ShowMessageBox($"{App.ProjectName} does not have write access to the install location you selected. Please choose another install location.", MessageBoxImage.Error);
                return;
            }
            catch (Exception ex)
            {
                App.ShowMessageBox(ex.Message, MessageBoxImage.Error);
                return;
            }

            if (!App.IsFirstRun)
            {
                //App.Settings.ShouldSave = true;
                App.ShouldSaveConfigs = true;

                if (App.BaseDirectory != _originalBaseDirectory)
                {
                    App.ShowMessageBox($"{App.ProjectName} will install to the new location you've set the next time it runs.", MessageBoxImage.Information);

                    App.State.Prop.VersionGuid = "";

                    using (RegistryKey registryKey = Registry.CurrentUser.CreateSubKey($@"Software\{App.ProjectName}"))
                    {
                        registryKey.SetValue("InstallLocation", App.BaseDirectory);
                        registryKey.SetValue("OldInstallLocation", _originalBaseDirectory);
                        registryKey.Close();
                    }

                    // preserve settings
                    // we don't need to copy the bootstrapper over since the install process will do that automatically

                    // App.Settings.Save();
                    // File.Copy(Path.Combine(App.BaseDirectory, "Settings.json"), Path.Combine(App.BaseDirectory, "Settings.json"));
                }

                CloseWindow();
            }
            else
            {
                IDialogControl dialogControl = _dialogService.GetDialogControl();

                dialogControl.ButtonRightClick += (_, _) =>
                {
                    dialogControl.Hide();
                    App.IsSetupComplete = true;
                    CloseWindow();
                };

                dialogControl.ShowAndWaitAsync(
                    "Before you install", 
                    "After installation, you can open the menu again by searching for it in the Start menu.\n" + 
                    "If you want to revert back to the original Roblox launcher, just uninstall Bloxstrap and it will automatically revert."
                );
            }
        }
    }
}