using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using CommunityToolkit.Diagnostics;
using OwlCore.Extensions;
using StrixMusic.Sdk.AppModels;
using StrixMusic.Sdk.MediaPlayback;
using StrixMusic.Sdk.ViewModels;
using StrixMusic.Sdk.WinUI.Controls.Shells;
using StrixMusic.Shells.Groove.Helper;
using Windows.UI;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;

namespace StrixMusic.Shells.Groove.Controls
{
    /// <summary>
    /// A <see cref="Control"/> to display the now playing bar.
    /// </summary>
    public sealed partial class GrooveNowPlayingBar : NowPlayingBar
    {
        /// <summary>
        /// Backing dependency property for <see cref="BackgroundColor"/>.
        /// </summary>
        public static readonly DependencyProperty BackgroundColorProperty =
            DependencyProperty.Register(nameof(BackgroundColor), typeof(Color?), typeof(GrooveNowPlayingBar), new PropertyMetadata(null));

        /// <summary>
        /// Initializes a new instance of the <see cref="GrooveNowPlayingBar"/> class.
        /// </summary>
        public GrooveNowPlayingBar()
        {
            DefaultStyleKey = typeof(GrooveNowPlayingBar);
        }
        
        /// <summary>
        /// Gets or sets the color of the <see cref="Controls.GrooveNowPlayingBar"/> background.
        /// </summary>
        public Color? BackgroundColor
        {
            get => (Color?)GetValue(BackgroundColorProperty);
            set => SetValue(BackgroundColorProperty, value);
        }

        /// <inheritdoc/>
        private void AttachEvents_ActiveDevice(IDevice device)
        {
            device.NowPlayingChanged += ActiveDevice_NowPlayingChanged;
        }
        
        /// <inheritdoc/>
        private void DetachEvents_ActiveDevice(IDevice device)
        {
            device.NowPlayingChanged -= ActiveDevice_NowPlayingChanged;
        }

        private async void ActiveDevice_NowPlayingChanged(object sender, PlaybackItem e)
        {
            // Load images if there aren't images loaded.
            // Uncommenting this will cause NowPlaying album art to break randomly while skipping tracks.
            // Maybe just ask the api for the first image directly, glhf.
            Guard.IsNotNull(e.Track, nameof(e.Track));

            if (e.Track.TotalImageCount != 0)
            {
                // If there are images, grab the color from the first image.
                var images = await e.Track.GetImagesAsync(1, 0).ToListAsync();

                foreach (var image in images)
                    BackgroundColor = await Task.Run(() => DynamicColorHelper.GetImageAccentColorAsync(image.Uri));
            }
        }

        /// <inheritdoc/>
        protected override void OnActiveDeviceChanged(DeviceViewModel? oldValue, DeviceViewModel? newValue)
        {
            if (!(oldValue is null))
                DetachEvents_ActiveDevice(oldValue);

            if (!(newValue is null))
                AttachEvents_ActiveDevice(newValue);
        }
    }
}