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

namespace LehrerApp.Desktop.Views.Groups;

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

    protected override void OnDataContextChanged(EventArgs e)
    {
        base.OnDataContextChanged(e);
        if (DataContext is PlanningTabViewModel vm)
        {
            vm.OnAddUnit  = groupId => ShowUnitDialog(groupId, editingUnit: null);
            vm.OnEditUnit = unit    => ShowUnitDialog(unit.GroupId, editingUnit: unit);
            vm.OnConfirmDeleteUnit = ShowDeleteUnitDialog;
            vm.OnPickCopyTarget    = ShowCopyUnitDialog;
            vm.OnAddLesson = (unitId, groupId, materials, shorthands) =>
                ShowLessonDialog(unitId, groupId, materials, shorthands, editingLesson: null);
            vm.OnEditLesson = (lesson, materials, shorthands) =>
                ShowLessonDialog(lesson.UnitId, lesson.GroupId, materials, shorthands, editingLesson: lesson);
            vm.OnConfirmDeleteLesson = ShowDeleteLessonDialog;
            vm.OnPickMoveTarget      = ShowMoveLessonDialog;
        }
    }

    private async Task<bool> ShowUnitDialog(Guid groupId, Unit? editingUnit)
    {
        if (DataContext is not PlanningTabViewModel vm) return false;

        var dialogVm = new UnitDialogViewModel(
            App.Services.GetRequiredService<IUnitRepository>(),
            App.Services.GetRequiredService<ICompetencyDomainRepository>(),
            groupId, vm.SubjectId, vm.GradeLevel, vm.SubjectName, editingUnit);

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

        var ok = await dialog.ShowDialog<bool>(owner);
        return ok && dialogVm.Result is not null;
    }

    private async Task<bool> ShowDeleteUnitDialog(UnitSummary unit)
    {
        var info = new ConfirmDialogInfo
        {
            Title       = "Einheit löschen?",
            Message     = $"\"{unit.Title}\" wird inkl. aller zugehörigen Stunden endgültig gelöscht.",
            ConfirmText = "Löschen",
        };
        var dialog = new ConfirmDialog { DataContext = info };
        var owner = TopLevel.GetTopLevel(this) as Window;
        return owner is not null && await dialog.ShowDialog<bool>(owner);
    }

    private async Task<CopyUnitTarget?> ShowCopyUnitDialog(Unit unit)
    {
        var dialogVm = new CopyUnitDialogViewModel(
            App.Services.GetRequiredService<IGroupRepository>(), unit.GroupId);

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

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

    private async Task<bool> ShowLessonDialog(Guid unitId, Guid groupId,
        List<string> materialSuggestions, List<string> shorthandHistorySuggestions, Lesson? editingLesson)
    {
        var dialogVm = new LessonDialogViewModel(
            App.Services.GetRequiredService<ILessonRepository>(),
            App.Services.GetRequiredService<IShorthandCodeRepository>(),
            unitId, groupId, materialSuggestions, shorthandHistorySuggestions, editingLesson);

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

        var ok = await dialog.ShowDialog<bool>(owner);
        return ok && dialogVm.Result is not null;
    }

    private async Task<bool> ShowDeleteLessonDialog(LessonSummary lesson)
    {
        var info = new ConfirmDialogInfo
        {
            Title       = "Stunde löschen?",
            Message     = $"Die Stunde vom {lesson.DateDisplay} wird endgültig gelöscht.",
            ConfirmText = "Löschen",
        };
        var dialog = new ConfirmDialog { DataContext = info };
        var owner = TopLevel.GetTopLevel(this) as Window;
        return owner is not null && await dialog.ShowDialog<bool>(owner);
    }

    private async Task<MoveLessonTarget?> ShowMoveLessonDialog(Lesson lesson)
    {
        var dialogVm = new MoveLessonDialogViewModel(lesson.Date);
        var dialog = new MoveLessonDialog { DataContext = dialogVm };
        var owner = TopLevel.GetTopLevel(this) as Window;
        if (owner is null) return null;

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