using UnityEngine;
using UnityEngine.Playables;
using UnityEngine.UI;
using UnityEngine.EventSystems;

public class TimelineSliderController : MonoBehaviour,
    IBeginDragHandler, IEndDragHandler
{
    [Header("Timeline")]
    public PlayableDirector director;

    [Header("UI")]
    public Slider slider;

    private bool isDragging;

    public Animator[] animators;


    public void Freeze()
    {
        foreach (var animator in animators)
        {
            if (animator != null)
                animator.speed = 0f;
        }
    }

    public void Resume()
    {
        foreach (var animator in animators)
        {
            if (animator != null)
                animator.speed = 1f;
        }
    }

    void Start()
    {
        if (director == null || slider == null)
        {
            Debug.LogError("TimelineSliderController：引用未设置");
            enabled = false;
            return;
        }
        Freeze();
        // 确保 duration 有值
        director.Evaluate();
        //director.Play();
        slider.minValue = 0f;
        slider.maxValue = (float)director.duration;
        slider.wholeNumbers = false;

        slider.onValueChanged.AddListener(OnSliderValueChanged);
    }

    void Update()
    {
        // Timeline → Slider
        if (!isDragging && director.state == PlayState.Playing)
        {
            slider.value = (float)director.time;
        }
    }

    void OnSliderValueChanged(float value)
    {
        if (!isDragging)
            return;

        // Slider → Timeline
        director.time = value;
        director.Evaluate();
       
    }

    public void OnBeginDrag(PointerEventData eventData)
    {
        isDragging = true;
        director.Pause();
        Freeze();
    }

    public void OnEndDrag(PointerEventData eventData)
    {
        isDragging = false;

        director.time = slider.value;
        director.Evaluate();
        director.Play();
        Resume();
    }
}