using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media.Animation;
using System.Windows.Media.Imaging;
using System.Windows.Threading;

namespace HighGroundRoyaleLauncher
{
    public class BackgroundSlideshowManager
    {
        private readonly string[] _imagePaths;
        private readonly Image _targetImage;
        private readonly DispatcherTimer _timer;
        private int _currentIndex = 0;

        public BackgroundSlideshowManager(Image targetImage, string[] imagePaths, TimeSpan interval)
        {
            _targetImage = targetImage;
            _imagePaths = imagePaths;

            _timer = new DispatcherTimer
            {
                Interval = interval
            };
            _timer.Tick += OnTimerTick;
        }

        public void Start()
        {
            UpdateImage(); // first image
            _timer.Start();
        }

        private void OnTimerTick(object sender, EventArgs e)
        {
            _currentIndex = (_currentIndex + 1) % _imagePaths.Length;
            FadeToNextImage();
        }

        private void FadeToNextImage()
        {
            var fadeOut = new DoubleAnimation(1.0, 0.0, new Duration(TimeSpan.FromSeconds(1.5)));
            fadeOut.Completed += (s, e) =>
            {
                UpdateImage();

                var fadeIn = new DoubleAnimation(0.0, 1.0, new Duration(TimeSpan.FromSeconds(1.5)));
                _targetImage.BeginAnimation(UIElement.OpacityProperty, fadeIn);
            };

            _targetImage.BeginAnimation(UIElement.OpacityProperty, fadeOut);
        }

        private void UpdateImage()
        {
            try
            {
                var uri = new Uri($"pack://application:,,,/{_imagePaths[_currentIndex]}", UriKind.Absolute);
                var bitmap = new BitmapImage(uri);
                _targetImage.Source = bitmap;
            }
            catch
            {
                // Optional: silently fail or log if an image can't load
            }
        }

        public void Stop()
        {
            _timer.Stop();
        }
    }
}