using Harmonia.Core.Engine;
using Harmonia.Core.Player;
using Harmonia.Core.Playlists;
using System;

namespace Harmonia.WinUI.Session;

public class SessionTracker(
    ISessionService sessionService,
    IPlaylistManager playlistManager,
    IAudioPlayer audioPlayer) : ISessionTracker
{
    public void Start()
    {
        playlistManager.CurrentPlaylistChanged += OnCurrentPlaylistChanged;
        audioPlayer.PlayingSongChanged += OnPlayingSongChanged;
    }

    private void OnCurrentPlaylistChanged(object? sender, EventArgs e)
    {
        PlaylistState playlistState = sessionService.Session.Playlist;
        playlistState.OpenPlaylistUID = playlistManager.CurrentPlaylist?.UID;
    }

    private void OnPlayingSongChanged(object? sender, PlayingSongChangedEventArgs e)
    {
        AudioPlayerState audioPlayerState = sessionService.Session.Player;
        audioPlayerState.PlaylistSongUID = e.NewSong?.UID;
    }

    public void Capture()
    {
        AudioPlayerState audioPlayerState = sessionService.Session.Player;

        audioPlayerState.Position = audioPlayer.Position;
        audioPlayerState.PlaybackState = GetSemanticPlaybackState();
        audioPlayerState.Volume = audioPlayer.Volume;
        audioPlayerState.IsMuted = audioPlayer.IsMuted;
    }

    private AudioPlaybackState GetSemanticPlaybackState()
    {
        if (audioPlayer.PlayingSong is null)
            return AudioPlaybackState.Stopped;

        return audioPlayer.State == AudioPlaybackState.Playing
            ? AudioPlaybackState.Playing
            : AudioPlaybackState.Paused;
    }
}