using PamhagenSysCtrl.Helpers;
using System.IO;
using System.Windows;

namespace PamhagenSysCtrl.Dialogs {
    public partial class UpdateDialog : Window {

        private readonly string Url;
        private readonly CancellationTokenSource Cancellation = new();

        public UpdateDialog(string version, string url, long size) {
            Url = url;
            InitializeComponent();
            VersionText.Text = version;
            SizeText.Text = Math.Ceiling(size / 1024d / 1024d).ToString("N0");
        }

        private void OnClosed(object? sender, EventArgs evt) {
            Cancellation.Cancel();
            Cancellation.Dispose();
        }

        private async void InstallButton_Click(object sender, RoutedEventArgs evt) {
            Description.Visibility = Visibility.Collapsed;
            DownloadPanel.Visibility = Visibility.Visible;
            InstallButton.IsEnabled = false;

            try {
                var progress = new Progress<double>(value => DownloadProgress.Value = value * 100);
                var filename = Path.Combine(App.TempPath, $"PamhagenSysCtrl-{VersionText.Text}.msi");
                await UpdateService.DownloadInstaller(Url, filename, progress, Cancellation.Token);
                StatusText.Text = "Installer wird gestartet...";
                UpdateService.StartInstaller(filename);
                DialogResult = true;
            } catch (OperationCanceledException) {
                // Closing the dialog cancels an active download.
            } catch (Exception exc) {
                MessageBox.Show($"Das Update konnte nicht installiert werden:\n\n{exc.Message}", "Update installieren", MessageBoxButton.OK, MessageBoxImage.Error);
                Description.Visibility = Visibility.Visible;
                DownloadPanel.Visibility = Visibility.Collapsed;
                InstallButton.IsEnabled = true;
            }
        }
    }
}