using UnityEngine;
#if UNITY_EDITOR
using UnityEditor;
#endif
using UnityEngine.Audio;

public class MusicManager : MonoBehaviour
{
    public static MusicManager Instance { get; private set; }

    [Header("Clip & Output")]
    [Tooltip("The music track to loop.")]
    public AudioClip musicClip;
    [Tooltip("Optional mixer group output (Master/Music).")]
    public AudioMixerGroup outputMixer;

    [Header("Playback")]
    [Tooltip("Start playback automatically when the game starts.")]
    public bool playOnStart = true;
    [Tooltip("Loop the music indefinitely.")]
    public bool loop = true;

    [Header("Controls")]
    [Range(0f, 1f)]
    [Tooltip("Music volume (0..1).")]
    public float volume = 0.6f;
    [Tooltip("Mute/unmute music.")]
    public bool mute = false;

    AudioSource _source;

    void Awake()
    {
        // Singleton guard
        if (Instance != null && Instance != this)
        {
            Destroy(gameObject);
            return;
        }
        Instance = this;
        DontDestroyOnLoad(gameObject);

        // AudioSource setup
        _source = GetComponent<AudioSource>();
        if (_source == null) _source = gameObject.AddComponent<AudioSource>();

        _source.playOnAwake = false;
        _source.loop = loop;
        _source.clip = musicClip;
        _source.spatialBlend = 0f; // 2D music
        if (outputMixer) _source.outputAudioMixerGroup = outputMixer;

        ApplyInspectorSettings();

        if (playOnStart && musicClip != null)
            _source.Play();
    }

    void OnValidate()
    {
        // Keep runtime in sync with inspector tweaks
        if (_source != null)
        {
            ApplyInspectorSettings();

            // If you assign a new clip at runtime and playOnStart is true, auto-play it
            if (!_source.isPlaying && playOnStart && musicClip != null && Application.isPlaying)
                _source.Play();
        }
    }

    void ApplyInspectorSettings()
    {
        if (_source == null) return;
        _source.mute = mute;
        _source.volume = Mathf.Clamp01(volume);
        _source.loop = loop;

        if (_source.clip != musicClip)
        {
            _source.clip = musicClip;
        }
    }

    // Public helpers if you ever want to drive it from code/UI
    public void SetMuted(bool value) { mute = value; ApplyInspectorSettings(); }
    public void SetVolume(float value) { volume = Mathf.Clamp01(value); ApplyInspectorSettings(); }
    public void Play() { if (musicClip != null) _source.Play(); }
    public void Stop() { _source.Stop(); }
}