using CineBook.Models;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;

namespace CineBook.Views;

public partial class SeatSelectionDialog : Window
{
    private readonly Screening _screening;
    private readonly List<Seat> _seats;
    private Seat? _selectedSeat;

    public int SelectedSeatId => _selectedSeat?.SeatID ?? 0;
    public int SelectedScreeningId => _screening.ScreeningID;
    public decimal TotalPrice => _screening.PricePerSeat;
    public string SeatDisplay => _selectedSeat?.Display ?? "";

    public SeatSelectionDialog(Screening screening, List<Seat> seats, User user)
    {
        InitializeComponent();
        _screening = screening;
        _seats = seats;

        MovieInfoText.Text = screening.MovieTitle;
        ScreeningInfoText.Text = $"{screening.DateTimeDisplay}  |  {screening.Hall}  |  {screening.PriceDisplay} pro Sitz";

        BuildSeatGrid();
        UpdateSelection();
    }

    private void BuildSeatGrid()
    {
        var rows = _seats.GroupBy(s => s.Row).OrderBy(g => g.Key);
        var panel = new StackPanel();

        foreach (var row in rows)
        {
            var rowPanel = new StackPanel
            {
                Orientation = Orientation.Horizontal,
                Margin = new Thickness(0, 2, 0, 2)
            };
            rowPanel.Children.Add(new TextBlock
            {
                Text = row.Key,
                Width = 24,
                Foreground = Brushes.Gray,
                FontFamily = new FontFamily("Courier New"),
                VerticalAlignment = VerticalAlignment.Center,
                HorizontalAlignment = HorizontalAlignment.Center
            });

            foreach (var seat in row.OrderBy(s => s.SeatNumber))
            {
                var btn = new Button
                {
                    Content = seat.SeatNumber.ToString(),
                    Width = 34,
                    Height = 30,
                    Margin = new Thickness(2),
                    FontFamily = new FontFamily("Courier New"),
                    FontSize = 11,
                    Tag = seat,
                    IsEnabled = !seat.IsBooked,
                    Background = seat.IsBooked
                        ? new SolidColorBrush(Color.FromRgb(0x44, 0x22, 0x22))
                        : new SolidColorBrush(Color.FromRgb(0x1B, 0x4D, 0x2A)),
                    Foreground = seat.IsBooked ? Brushes.DarkRed : Brushes.LightGreen,
                    BorderBrush = seat.IsBooked
                        ? new SolidColorBrush(Color.FromRgb(0x80, 0x20, 0x20))
                        : new SolidColorBrush(Color.FromRgb(0x27, 0xAE, 0x60)),
                    BorderThickness = new Thickness(1),
                    Cursor = seat.IsBooked
                        ? System.Windows.Input.Cursors.No
                        : System.Windows.Input.Cursors.Hand
                };
                btn.ToolTip = $"Reihe {seat.Row}, Sitz {seat.SeatNumber} ({seat.Category})";
                btn.Click += SeatClick;
                rowPanel.Children.Add(btn);
            }
            panel.Children.Add(rowPanel);
        }

        SeatsPanel.ItemsSource = new[] { new ContentControl { Content = panel } };
    }

    private void SeatClick(object sender, RoutedEventArgs e)
    {
        if (sender is not Button btn || btn.Tag is not Seat seat) return;
        _selectedSeat = seat;
        UpdateSelection();

        foreach (var child in FindVisualChildren<Button>(SeatsPanel))
        {
            if (child.Tag is Seat s && !s.IsBooked)
            {
                bool isSel = s.SeatID == seat.SeatID;
                child.Background = isSel
                    ? new SolidColorBrush(Color.FromRgb(0x7A, 0x62, 0x00))
                    : new SolidColorBrush(Color.FromRgb(0x1B, 0x4D, 0x2A));
                child.Foreground = isSel ? Brushes.Gold : Brushes.LightGreen;
            }
        }
    }

    private void UpdateSelection()
    {
        SelectedSeatText.Text = _selectedSeat != null
            ? $"Reihe {_selectedSeat.Row}, Sitz {_selectedSeat.SeatNumber} ({_selectedSeat.Category})"
            : "— kein Sitz gewählt —";
        PriceText.Text = _selectedSeat != null ? $"{_screening.PricePerSeat:F2} €" : "";
        BtnConfirm.IsEnabled = _selectedSeat != null;
    }

    private void ConfirmClick(object sender, RoutedEventArgs e)
    {
        if (_selectedSeat == null) return;
        DialogResult = true;
        Close();
    }

    private void CancelClick(object sender, RoutedEventArgs e)
    {
        DialogResult = false;
        Close();
    }

    private static IEnumerable<T> FindVisualChildren<T>(DependencyObject parent) where T : DependencyObject
    {
        for (int i = 0; i < VisualTreeHelper.GetChildrenCount(parent); i++)
        {
            var child = VisualTreeHelper.GetChild(parent, i);
            if (child is T t) yield return t;
            foreach (var sub in FindVisualChildren<T>(child))
                yield return sub;
        }
    }
}