using UnityEngine;

/// <summary>
/// 挂在每个 ping 对象上。蓝色圆环闪烁描边，两步点击：
/// 1. 第一次点击 → 停止闪烁，显示 ping 模型
/// 2. 第二次点击 → 显示对应 chanrao，隐藏自己，激活下个 ping
/// 点击通知 StepManager 记录步骤。
/// </summary>
public class PingClickHandler : MonoBehaviour
{
    public GameObject chanraoObject;
    public GameObject nextPing;
    public int pingIndex; // ping.004=0, ping.003=1, ping.002=2, ping.001=3

    private MeshRenderer _meshRenderer;
    private LineRenderer _outlineRenderer;
    private bool _clickedOnce;

    void Start()
    {
        _meshRenderer = GetComponent<MeshRenderer>();
        if (_meshRenderer == null) _meshRenderer = GetComponentInChildren<MeshRenderer>();
        CreateBlueOutline();
        StartCoroutine(BlinkOutline());
    }

    void OnEnable()
    {
        _meshRenderer = GetComponent<MeshRenderer>();
        if (_meshRenderer == null) _meshRenderer = GetComponentInChildren<MeshRenderer>();
        if (_meshRenderer != null) _meshRenderer.enabled = false; // 初始隐藏模型，只留描边
        CreateBlueOutline();
        _clickedOnce = false;
        StopAllCoroutines();
        StartCoroutine(BlinkOutline());
    }

    void CreateBlueOutline()
    {
        if (_outlineRenderer != null) return;
        var ringGo = new GameObject("BlueRing");
        ringGo.transform.SetParent(transform, false);
        ringGo.transform.localPosition = Vector3.zero;
        ringGo.transform.localRotation = Quaternion.Euler(90f, 0, 0);

        _outlineRenderer = ringGo.AddComponent<LineRenderer>();
        _outlineRenderer.useWorldSpace = false;
        _outlineRenderer.loop = true;
        _outlineRenderer.startWidth = 0.04f;
        _outlineRenderer.endWidth = 0.04f;
        _outlineRenderer.material = new Material(Shader.Find("Unlit/Color"));
        _outlineRenderer.material.color = new Color(0.2f, 0.5f, 1f);
        _outlineRenderer.startColor = new Color(0.2f, 0.5f, 1f);
        _outlineRenderer.endColor = new Color(0.2f, 0.5f, 1f);

        float r = 0.25f;
        int segs = 32;
        _outlineRenderer.positionCount = segs;
        for (int i = 0; i < segs; i++)
        {
            float a = i * 2f * Mathf.PI / segs;
            _outlineRenderer.SetPosition(i, new Vector3(Mathf.Cos(a) * r, Mathf.Sin(a) * r, 0));
        }
    }

    System.Collections.IEnumerator BlinkOutline()
    {
        while (true)
        {
            if (_outlineRenderer != null)
                _outlineRenderer.enabled = !_outlineRenderer.enabled;
            yield return new WaitForSeconds(0.4f);
        }
    }

    void OnMouseDown()
    {
        if (!_clickedOnce)
        {
            // 第一次点击：停止闪烁，显示模型
            _clickedOnce = true;
            StopAllCoroutines();
            if (_meshRenderer != null) _meshRenderer.enabled = true;
            if (_outlineRenderer != null) _outlineRenderer.enabled = true;
            Debug.Log($"[PingClick] {name} 第一次点击，模型显示");
        }
        else
        {
            // 第二次点击：显示 chanrao，隐藏自己，激活下个 ping
            if (chanraoObject != null)
            {
                chanraoObject.SetActive(true);
                Debug.Log($"[PingClick] {chanraoObject.name} 已显示");
            }

            StopAllCoroutines();
            if (_meshRenderer != null) _meshRenderer.enabled = false;
            if (_outlineRenderer != null) _outlineRenderer.enabled = false;
            gameObject.SetActive(false);

            if (nextPing != null)
            {
                nextPing.SetActive(true);
                Debug.Log($"[PingClick] {name} → {nextPing.name} 已激活");
            }
        }

        // 通知 StepManager
        var sm = FindObjectOfType<StepManager>();
        if (sm != null) sm.RecordPingStep(pingIndex, _clickedOnce);
    }

    /// <summary>上一步撤销：恢复到first-click状态</summary>
    public void UndoSecondClick()
    {
        if (!_clickedOnce) return;
        _clickedOnce = false;
        gameObject.SetActive(true);
        if (_meshRenderer != null) _meshRenderer.enabled = false;
        StopAllCoroutines();
        StartCoroutine(BlinkOutline());
    }

    /// <summary>上一步撤销：隐藏自己，恢复前一个ping</summary>
    public void UndoShow()
    {
        gameObject.SetActive(false);
    }
}