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

namespace LehrerApp.Desktop.Views.Exams;

public partial class ExamsOverviewView : UserControl
{
    private const int GroupDetailKlausurenTabIndex = 4;

    public ExamsOverviewView() => InitializeComponent();

    protected override void OnDataContextChanged(EventArgs e)
    {
        base.OnDataContextChanged(e);
        if (DataContext is ExamsOverviewViewModel vm)
        {
            vm.OnGradeExam = ShowGradeExamDialog;
            vm.OnEvaluateExam = ShowEvaluateExamDialog;
            vm.OnNavigateToGroup = groupId => App.Services.GetRequiredService<MainWindowViewModel>()
                .NavigateToGroupDetail(groupId, GroupDetailKlausurenTabIndex);
        }
    }

    private async Task ShowGradeExamDialog(Exam exam)
    {
        var group = App.Services.GetRequiredService<IGroupRepository>().GetById(exam.GroupId);
        if (group is null) return;

        var dialogVm = new ExamGradingDialogViewModel(
            App.Services.GetRequiredService<IExamResultRepository>(),
            App.Services.GetRequiredService<IStudentRepository>(),
            App.Services.GetRequiredService<IGroupMembershipRepository>(),
            App.Services.GetRequiredService<GradingService>(),
            exam, group.Id);

        var dialog = new ExamGradingDialog { DataContext = dialogVm };
        var owner = TopLevel.GetTopLevel(this) as Window;
        if (owner is not null) await dialog.ShowDialog(owner);
    }

    private async Task ShowEvaluateExamDialog(Exam exam)
    {
        var group = App.Services.GetRequiredService<IGroupRepository>().GetById(exam.GroupId);
        if (group is null) return;

        var dialogVm = new ExamEvaluationDialogViewModel(
            App.Services.GetRequiredService<IExamRepository>(),
            App.Services.GetRequiredService<IExamResultRepository>(),
            App.Services.GetRequiredService<GradingService>(),
            exam, group.GradingSystem);

        var dialog = new ExamEvaluationDialog { DataContext = dialogVm };
        var owner = TopLevel.GetTopLevel(this) as Window;
        if (owner is not null) await dialog.ShowDialog(owner);
    }
}