BetterLyrics/BetterLyrics.WinUI3/BetterLyrics.WinUI3/ViewModels/NowPlayingPageViewModel.cs

// 2025/6/23 by Zhe Fang

using BetterLyrics.WinUI3.Hooks;
using BetterLyrics.WinUI3.Models;
using BetterLyrics.WinUI3.Services.LiveStatesService;
using BetterLyrics.WinUI3.Services.MediaSessionsService;
using BetterLyrics.WinUI3.Views;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using System.Threading.Tasks;

namespace BetterLyrics.WinUI3.ViewModels
{
    public partial class NowPlayingPageViewModel : BaseViewModel
    {
        public IMediaSessionsService MediaSessionsService { get; private set; }
        private readonly ILiveStatesService _liveStatesService;

        [ObservableProperty]
        public partial LiveStates LiveStates { get; set; }

        [ObservableProperty]
        public partial int Volume { get; set; }

        [ObservableProperty]
        public partial double BottomCommandGridOpacity { get; set; }

        [ObservableProperty]
        public partial double BottomCommandFlyoutTriggerOpacity { get; set; }

        [ObservableProperty]
        public partial float TimelineSliderThumbOpacity { get; set; } = 0f;

        [ObservableProperty]
        public partial LyricsLine? TimelineSliderThumbLyricsLine { get; set; }

        [ObservableProperty]
        public partial double TimelineSliderThumbSeconds { get; set; } = 0;

        public NowPlayingPageViewModel(IMediaSessionsService mediaSessionsService, ILiveStatesService liveStatesService)
        {
            _liveStatesService = liveStatesService;
            MediaSessionsService = mediaSessionsService;

            LiveStates = _liveStatesService.LiveStates;

            Volume = SystemVolumeHook.MasterVolume;
            SystemVolumeHook.VolumeNotification += SystemVolumeHelper_VolumeNotification;
        }

        private void SystemVolumeHelper_VolumeNotification(object? sender, int e)
        {
            Volume = e;
        }

        partial void OnTimelineSliderThumbSecondsChanged(double value)
        {
            TimelineSliderThumbLyricsLine = MediaSessionsService.CurrentLyricsData?.GetLyricsLine(value);
        }

        [RelayCommand]
        private static void OpenSettingsWindow()
        {
            WindowHook.OpenOrShowWindow<SettingsWindow>();
        }

        [RelayCommand]
        private async Task PlaySongAsync()
        {
            await MediaSessionsService.PlayAsync();
        }

        [RelayCommand]
        private async Task PauseSongAsync()
        {
            await MediaSessionsService.PauseAsync();
        }

        [RelayCommand]
        private async Task PreviousSongAsync()
        {
            await MediaSessionsService.PreviousAsync();
        }

        [RelayCommand]
        private async Task NextSongAsync()
        {
            await MediaSessionsService.NextAsync();
        }

    }
}