using UnityEngine;

/// <summary>
/// 地面裂纹特效控制器
/// 挂在平躺的 Quad 上，砸地/劈砍命中时调用 Play()
/// 流程：扩散(0→1) → 保持 → 淡出 → 结束
/// </summary>
[RequireComponent(typeof(Renderer))]
public class GroundCrack : MonoBehaviour
{
    [Header("时间")]
    public float spreadTime = 0.3f;   // 裂纹扩散时间
    public float holdTime = 0.8f;     // 保持时间
    public float fadeTime = 0.6f;     // 淡出时间

    [Header("外观")]
    public Color crackColor = Color.black;  // 裂纹颜色（黑=普通地裂，红=熔岩，紫=暗影）
    public Color glowColor = new Color(1f, 0.3f, 0f, 0f); // 发光色（A=0不发光）

    [Header("测试")]
    public bool autoPlayOnStart = true;

    private Material mat;
    private float timer;
    private int state; // 0=扩散 1=保持 2=淡出 3=结束
    private bool initialized;

    void Start()
    {
        Init();
        if (autoPlayOnStart) Play();
    }

    private void Init()
    {
        if (initialized) return;
        mat = GetComponent<Renderer>().material;
        mat.SetFloat("_Progress", 0f);
        mat.SetFloat("_Opacity", 0f);
        initialized = true;
    }

    /// <summary>
    /// 砸地/劈砍命中时调用
    /// </summary>
    [ContextMenu("▶ 播放一次")]
    public void Play()
    {
        Init();
        timer = 0f;
        state = 0;
        mat.SetFloat("_Opacity", 1f);
        mat.SetFloat("_Progress", 0f);
        mat.SetColor("_CrackColor", crackColor);
        mat.SetColor("_GlowColor", glowColor);
        Debug.Log("[GroundCrack] 裂纹触发");
    }

    void Update()
    {
        if (state >= 3) return;

        timer += Time.deltaTime;

        if (state == 0) // 扩散
        {
            float p = Mathf.Clamp01(timer / spreadTime);
            mat.SetFloat("_Progress", p);
            if (timer >= spreadTime) { state = 1; timer = 0f; }
        }
        else if (state == 1) // 保持
        {
            if (timer >= holdTime) { state = 2; timer = 0f; }
        }
        else if (state == 2) // 淡出
        {
            float f = 1f - Mathf.Clamp01(timer / fadeTime);
            mat.SetFloat("_Opacity", f);
            if (timer >= fadeTime)
            {
                state = 3;
                mat.SetFloat("_Opacity", 0f);
                Debug.Log("[GroundCrack] 裂纹结束");
            }
        }
    }
}
//（注：内容由AI生成）