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

namespace LehrerApp.Desktop.Views.Groups;

public partial class GroupDetailView : UserControl
{
    public GroupDetailView() => InitializeComponent();

    protected override void OnDataContextChanged(EventArgs e)
    {
        base.OnDataContextChanged(e);
        if (DataContext is GroupDetailViewModel vm)
        {
            vm.OnAddStudent      = ShowAddStudentDialog;
            vm.OnAddExam         = ShowAddExamDialog;
            vm.OnEditExam        = ShowEditExamDialog;
            vm.OnDuplicateExam   = ShowDuplicateExamDialog;
            vm.OnConfirmDeleteExam = ShowDeleteExamDialog;
        }
    }

    private async Task<bool> ShowAddStudentDialog()
    {
        if (DataContext is not GroupDetailViewModel vm || vm.Group is null) return false;

        var dialogVm = new AddStudentToGroupDialogViewModel(
            App.Services.GetRequiredService<IStudentRepository>(),
            App.Services.GetRequiredService<IEnrollmentRepository>(),
            vm.Group.Id,
            vm.Group.SchoolYear);

        var dialog = new AddStudentToGroupDialog { DataContext = dialogVm };
        var owner = TopLevel.GetTopLevel(this) as Window;
        if (owner is null) return false;

        return await dialog.ShowDialog<bool>(owner);
    }

    private Task<bool> ShowAddExamDialog(Guid groupId) =>
        ShowExamDialog(groupId, editingExam: null, duplicateSource: null);

    private Task<bool> ShowEditExamDialog(Exam exam) =>
        ShowExamDialog(exam.GroupId, editingExam: exam, duplicateSource: null);

    private Task<bool> ShowDuplicateExamDialog(Exam exam) =>
        ShowExamDialog(exam.GroupId, editingExam: null, duplicateSource: exam);

    private async Task<bool> ShowExamDialog(Guid groupId, Exam? editingExam, Exam? duplicateSource)
    {
        if (DataContext is not GroupDetailViewModel vm || vm.Group is null) return false;

        var dialogVm = new ExamDialogViewModel(
            App.Services.GetRequiredService<IExamRepository>(),
            App.Services.GetRequiredService<ICompetencyDomainRepository>(),
            groupId, vm.Group.SubjectId, vm.Group.GradeLevel, vm.Group.GradingSystem,
            vm.Group.Subject ?? "", editingExam, duplicateSource);

        var dialog = new ExamDialog { DataContext = dialogVm };
        var owner = TopLevel.GetTopLevel(this) as Window;
        if (owner is null) return false;

        return await dialog.ShowDialog<bool>(owner);
    }

    private async Task<bool> ShowDeleteExamDialog(ExamSummary exam)
    {
        var dialog = new DeleteExamDialog { DataContext = exam.Title };
        var owner = TopLevel.GetTopLevel(this) as Window;
        return owner is not null && await dialog.ShowDialog<bool>(owner);
    }
}