using Avalonia.Controls;
using Avalonia.Interactivity;
using LehrerApp.Core.Interfaces;
using LehrerApp.Core.Models;
using LehrerApp.Desktop.Services;
using LehrerApp.Desktop.ViewModels.Groups;
using Microsoft.Extensions.DependencyInjection;

namespace LehrerApp.Desktop.Views.Groups;

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

    protected override void OnDataContextChanged(EventArgs e)
    {
        base.OnDataContextChanged(e);
        if (DataContext is LessonDialogViewModel vm)
            vm.OnPickAlternativePath = ShowAlternativePathDialog;
    }

    private async Task<AlternativeLessonPath?> ShowAlternativePathDialog(Guid? currentId)
    {
        var dialogVm = new AlternativePathDialogViewModel(
            App.Services.GetRequiredService<IAlternativeLessonPathRepository>(), currentId);
        var dialog = new AlternativePathDialog { DataContext = dialogVm };

        var ok = await dialog.ShowDialog<bool>(this);
        return ok ? dialogVm.Result : null;
    }

    private void OnSave(object? s, RoutedEventArgs e)
    {
        if (DataContext is LessonDialogViewModel vm && vm.SaveCommand.CanExecute(null))
        {
            vm.SaveCommand.Execute(null);
            if (vm.Result is not null) Close(true);
        }
    }

    private void OnCancel(object? s, RoutedEventArgs e) => Close(false);

    /// KI-Unterstützung mit Fokus auf genau diese (bereits gespeicherte) Stunde, statt den Umweg
    /// über die Einheiten-Übersicht nehmen zu müssen (4.5.22, Nutzer-Feedback). Die Übernahme im
    /// AiAssistDialog speichert direkt ins Repository — dieser Dialog schließt sich danach mit dem
    /// frisch geladenen Stand, statt seine eigenen (jetzt veralteten) Feldwerte zu speichern.
    private async void OnAiAssist(object? s, RoutedEventArgs e)
    {
        if (DataContext is not LessonDialogViewModel vm || vm.EditingLesson is null) return;

        var unitRepo = App.Services.GetRequiredService<IUnitRepository>();
        var unit = unitRepo.GetById(vm.UnitId);
        if (unit is null) return;

        var lessonRepo = App.Services.GetRequiredService<ILessonRepository>();
        var currentLesson = lessonRepo.GetByUnit(vm.UnitId).FirstOrDefault(l => l.Id == vm.EditingLesson.Id);
        if (currentLesson is null) return;

        var dialogVm = new AiAssistDialogViewModel(
            App.Services.GetRequiredService<AiPlanningService>(),
            App.Services.GetRequiredService<AiSettingsService>(),
            lessonRepo, unit, focusLesson: currentLesson);

        var dialog = new AiAssistDialog { DataContext = dialogVm };
        var ok = await dialog.ShowDialog<bool>(this);
        if (!ok) return;

        var updated = lessonRepo.GetByUnit(vm.UnitId).FirstOrDefault(l => l.Id == vm.EditingLesson.Id);
        if (updated is not null) vm.MarkAppliedExternally(updated);
        Close(true);
    }
}