using Avalonia.Controls;
using Avalonia.Interactivity;
using Avalonia.Platform.Storage;
using LehrerApp.Desktop.ViewModels.Students;

namespace LehrerApp.Desktop.Views.Students;

public partial class CreateLetterDialog : Window
{
    public CreateLetterDialog() => InitializeComponent();

    private async void OnGenerate(object? sender, RoutedEventArgs e)
    {
        if (DataContext is not CreateLetterDialogViewModel vm) return;
        if (vm.UsesAttendanceAdvancedContent && !vm.AttendanceCalendarConfigured &&
            !await ConfigureAttendanceCalendar(vm)) return;
        var file = await StorageProvider.SaveFilePickerAsync(new FilePickerSaveOptions
        {
            Title = "PDF-Brief speichern",
            SuggestedFileName = vm.SuggestedFileName,
            DefaultExtension = "pdf",
            FileTypeChoices = [new FilePickerFileType("PDF-Dateien") { Patterns = ["*.pdf"] }],
        });
        if (file is null || !vm.Generate(file.Path.LocalPath)) return;
        Close(file.Path.LocalPath);
    }

    private async void OnConfigureAttendanceCalendar(object? sender, RoutedEventArgs e)
    {
        if (DataContext is CreateLetterDialogViewModel vm) await ConfigureAttendanceCalendar(vm);
    }

    private async void OnSelectContact(object? sender, RoutedEventArgs e)
    {
        if (DataContext is not CreateLetterDialogViewModel vm) return;
        var dialogVm = new SelectContactDialogViewModel(vm.Contacts, vm.SelectedContact);
        var dialog = new SelectContactDialog { DataContext = dialogVm };
        if (await dialog.ShowDialog<bool>(this)) vm.SelectedContact = dialogVm.SelectedContact;
    }

    private async Task<bool> ConfigureAttendanceCalendar(CreateLetterDialogViewModel vm)
    {
        var configVm = new AttendanceCalendarConfigurationViewModel(vm.GetAttendanceCalendarOptions());
        var dialog = new AttendanceCalendarConfigurationDialog { DataContext = configVm };
        if (!await dialog.ShowDialog<bool>(this)) return false;
        await vm.SetAttendanceCalendarOptionsAsync(configVm.BuildResult());
        return true;
    }

    private void OnCancel(object? sender, RoutedEventArgs e) => Close(null);
}