using CineBook.Data;
using CineBook.Helpers;
using CineBook.Models;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Controls;

namespace CineBook.Views;

public partial class BookingsView : UserControl
{
    private readonly Repository _repo;
    private readonly User _currentUser;
    private Booking? _selected;
    private List<Booking> _allBookings = new();

    public BookingsView(Repository repo, User user)
    {
        InitializeComponent();
        _repo = repo;
        _currentUser = user;

        if (!Session.IsAdmin)
            BtnCancel.Visibility = Visibility.Collapsed;

        StatusFilter.SelectedIndex = 0;
        LoadBookings();
    }

    private void LoadBookings()
    {
        try
        {
            _allBookings = Session.IsAdmin
                ? _repo.GetAllBookings()
                : _repo.GetBookingsByUser(_currentUser.UserID);
            ApplyFilter();
        }
        catch (System.Exception ex) { StatusText.Text = "⚠ Fehler: " + ex.Message; }
    }

    private void ApplyFilter()
    {
        var filter = (StatusFilter.SelectedItem as ComboBoxItem)?.Content?.ToString() ?? "Alle";
        var data = filter == "Alle" ? _allBookings : _allBookings.Where(b => b.Status == filter).ToList();
        BookingsGrid.ItemsSource = data;
        StatusText.Text = $"● {data.Count} Buchungen angezeigt.";
    }

    private void FilterChanged(object sender, SelectionChangedEventArgs e) => ApplyFilter();
    private void RefreshClick(object sender, RoutedEventArgs e) => LoadBookings();

    private void GridSelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        _selected = BookingsGrid.SelectedItem as Booking;
        BtnCancel.IsEnabled = _selected != null && _selected.Status == "Confirmed" && Session.IsAdmin;
    }

    private void CancelBookingClick(object sender, RoutedEventArgs e)
    {
        if (_selected == null) return;
        var r = MessageBox.Show($"Buchung {_selected.BookingCode} wirklich stornieren?",
            "Stornierung", MessageBoxButton.YesNo, MessageBoxImage.Warning);
        if (r == MessageBoxResult.Yes)
        {
            try
            {
                _repo.CancelBooking(_selected.BookingID, _selected.SeatID, _selected.ScreeningID);
                LoadBookings();
                MessageBox.Show("Buchung erfolgreich storniert.", "Erfolg", MessageBoxButton.OK, MessageBoxImage.Information);
            }
            catch (System.Exception ex)
            {
                MessageBox.Show("DB-Fehler: " + ex.Message, "Fehler", MessageBoxButton.OK, MessageBoxImage.Error);
            }
        }
    }
}