using CineBook.Data;
using CineBook.Helpers;
using CineBook.Models;
using System.Windows;
using System.Windows.Controls;

namespace CineBook.Views;

public partial class AdminPanelView : UserControl
{
    private readonly Repository _repo;
    private User? _selected;

    public AdminPanelView(Repository repo)
    {
        InitializeComponent();
        _repo = repo;
        if (!Session.IsAdmin)
        {
            StatusText.Text = "⚠ Kein Zugriff. Nur für Administratoren.";
            return;
        }
        LoadUsers();
    }

    private void LoadUsers()
    {
        try
        {
            UsersGrid.ItemsSource = _repo.GetAllUsers();
            StatusText.Text = $"● {_repo.GetAllUsers().Count} Benutzer geladen.";
        }
        catch (System.Exception ex) { StatusText.Text = "⚠ Fehler: " + ex.Message; }
    }

    private void GridSelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        _selected = UsersGrid.SelectedItem as User;
        BtnEditUser.IsEnabled = _selected != null;
        BtnDeleteUser.IsEnabled = _selected != null;
    }

    private void RefreshClick(object sender, RoutedEventArgs e) => LoadUsers();

    private void AddUserClick(object sender, RoutedEventArgs e)
    {
        var dlg = new UserEditDialog(null);
        if (dlg.ShowDialog() == true)
        {
            try
            {
                if (_repo.CreateUser(dlg.Username, dlg.Password, dlg.Role, dlg.Email))
                    LoadUsers();
                else
                    MessageBox.Show("Fehler beim Anlegen. Benutzername bereits vergeben?", "Fehler", MessageBoxButton.OK, MessageBoxImage.Error);
            }
            catch (System.Exception ex) { MessageBox.Show("DB-Fehler: " + ex.Message); }
        }
    }

    private void EditUserClick(object sender, RoutedEventArgs e)
    {
        if (_selected == null) return;
        var dlg = new UserEditDialog(_selected);
        if (dlg.ShowDialog() == true)
        {
            try
            {
                _repo.UpdateUser(_selected.UserID, dlg.Username, dlg.Role, dlg.Email);
                LoadUsers();
            }
            catch (System.Exception ex) { MessageBox.Show("DB-Fehler: " + ex.Message); }
        }
    }

    private void DeleteUserClick(object sender, RoutedEventArgs e)
    {
        if (_selected == null) return;
        if (_selected.UserID == Session.CurrentUser?.UserID)
        {
            MessageBox.Show("Sie können sich nicht selbst löschen!", "Fehler", MessageBoxButton.OK, MessageBoxImage.Warning);
            return;
        }
        var r = MessageBox.Show($"Benutzer \"{_selected.Username}\" wirklich löschen?",
            "Bestätigung", MessageBoxButton.YesNo, MessageBoxImage.Warning);
        if (r == MessageBoxResult.Yes)
        {
            try { _repo.DeleteUser(_selected.UserID); LoadUsers(); }
            catch (System.Exception ex) { MessageBox.Show("DB-Fehler: " + ex.Message); }
        }
    }
}