using UnityEngine;
using System.Collections;

/// <summary>
/// 按步骤触发对应动画：开场动画、脱鞋、绑带、夹板放置等。
/// 挂在场景中有动画关联物体的 GameObject 上。
/// 由 ExperimentFlowCoordinator 绑定到 StepManager.OnStepChanged。
/// </summary>
public class StepAnimationHandler : MonoBehaviour
{
    [Header("角色引用")]
    [SerializeField] private CharacterAnimController _patient;
    [SerializeField] private CharacterAnimController _rescuer;

    [Header("道具引用")]
    [SerializeField] private GameObject _shoeLeft;     // 伤者左脚鞋
    [SerializeField] private GameObject _shoeRight;    // 伤者右脚鞋
    [SerializeField] private GameObject[] _bandages;   // 绑带物件列表
    [SerializeField] private GameObject[] _splints;    // 夹板物件列表
    [SerializeField] private GameObject _padding;      // 衬垫

    [Header("夹板固定专用道具")]
    [SerializeField] private GameObject _splintLeft;
    [SerializeField] private GameObject _splintRight;

    [Header("伤口高亮")]
    [SerializeField] private GameObject _woundHighlight;

    [Header("动画时长")]
    [SerializeField] private float _shoeRemoveDuration = 1.5f;
    [SerializeField] private float _bandageAppearDuration = 0.5f;

    /// <summary>由 StepManager.OnStepChanged 调用</summary>
    public void PlayStepAnimation(int stepIndex)
    {
        var sm = FindObjectOfType<StepManager>();
        if (sm == null) return;

        var step = sm.GetCurrentStep();
        if (step == null) return;

        StopAllCoroutines();

        // 根据步骤名称匹配动画
        switch (step.StepName)
        {
            case "OpeningScene":
                StartCoroutine(PlayOpeningScene());
                break;
            case "RemoveShoes":
                StartCoroutine(PlayRemoveShoes());
                break;
            case "PlaceBandage":
                StartCoroutine(PlayPlaceBandage());
                break;
            case "LimbFixation":
                StartCoroutine(PlayLimbFixation());
                break;
            case "SplintFixation":
                StartCoroutine(PlaySplintFixation());
                break;
            case "AnkleFixation":
                StartCoroutine(PlayAnkleFixation());
                break;
            case "FinalCheck":
                break;
            default:
                Debug.Log($"StepAnimationHandler: 步骤 {step.StepName} 无专属动画");
                break;
        }
    }

    #region 动画协程

    private IEnumerator PlayOpeningScene()
    {
        // 伤者跑步 → 跳高 → 摔倒
        _patient?.PlayRun();
        yield return new WaitForSeconds(4f);
        _patient?.TriggerJump();
        yield return new WaitForSeconds(1f);
        _patient?.TriggerFall();
        yield return new WaitForSeconds(1.5f);
        _patient?.StopRun();
    }

    private IEnumerator PlayRemoveShoes()
    {
        // 鞋子弹开/移出
        if (_shoeLeft != null)
        {
            Vector3 target = _shoeLeft.transform.position + Vector3.right * 0.5f + Vector3.up * 0.2f;
            yield return StartCoroutine(MoveToPosition(_shoeLeft, target, _shoeRemoveDuration));
            _shoeLeft.SetActive(false);
        }
        if (_shoeRight != null)
        {
            Vector3 target = _shoeRight.transform.position + Vector3.right * 0.5f + Vector3.up * 0.2f;
            yield return StartCoroutine(MoveToPosition(_shoeRight, target, _shoeRemoveDuration));
            _shoeRight.SetActive(false);
        }
    }

    private IEnumerator PlayPlaceBandage()
    {
        // 显示绑带
        foreach (var b in _bandages)
        {
            if (b != null) b.SetActive(true);
        }
        yield return null;
    }

    private IEnumerator PlayLimbFixation()
    {
        // 显示衬垫 + 激活绑带
        if (_padding != null) _padding.SetActive(true);
        yield return new WaitForSeconds(0.5f);

        // 依次显示绑带
        for (int i = 0; i < _bandages.Length; i++)
        {
            if (_bandages[i] != null)
            {
                _bandages[i].SetActive(true);
                yield return new WaitForSeconds(_bandageAppearDuration);
            }
        }
    }

    private IEnumerator PlaySplintFixation()
    {
        // 显示夹板
        if (_splintLeft != null) _splintLeft.SetActive(true);
        if (_splintRight != null) _splintRight.SetActive(true);
        yield return new WaitForSeconds(0.5f);

        foreach (var s in _splints)
        {
            if (s != null) s.SetActive(true);
            yield return new WaitForSeconds(_bandageAppearDuration);
        }
    }

    private IEnumerator PlayAnkleFixation()
    {
        // 8 字绑带动画 - 激活脚踝处绑带
        if (_bandages.Length > 0 && _bandages[_bandages.Length - 1] != null)
        {
            _bandages[_bandages.Length - 1].SetActive(true);
        }
        yield return null;
    }

    #endregion

    #region 工具方法

    private IEnumerator MoveToPosition(GameObject obj, Vector3 target, float duration)
    {
        if (obj == null) yield break;

        Vector3 start = obj.transform.position;
        float elapsed = 0f;
        while (elapsed < duration)
        {
            elapsed += Time.deltaTime;
            obj.transform.position = Vector3.Lerp(start, target, elapsed / duration);
            yield return null;
        }
        obj.transform.position = target;
    }

    /// <summary>显示伤口高亮</summary>
    public void ShowWoundHighlight(bool show)
    {
        if (_woundHighlight != null) _woundHighlight.SetActive(show);
    }

    #endregion
}