using UnityEngine;

/// <summary>
/// 控制冲击波扩散效果
/// 可通过代码动态调整颜色、大小、速度等参数，实现不同技能的复用
/// </summary>
public class ShockwaveEffect : MonoBehaviour
{
    [Header("扩散参数")]
    [Tooltip("扩散持续时间（秒）")]
    public float duration = 1f;
    
    [Tooltip("扩散完成后是否自动销毁")]
    public bool autoDestroy = true;

    [Header("运行时可配置参数（可选）")]
    [Tooltip("覆盖材质颜色（Alpha=0时不覆盖）")]
    public Color overrideColor = new Color(0, 0, 0, 0);
    
    [Tooltip("覆盖扩散半径（<=0时使用Transform.localScale）")]
    public float overrideRadius = 0f;
    
    [Tooltip("覆盖圆环粗细（<=0时使用材质默认值）")]
    public float overrideRingWidth = 0f;

    private Material material;
    private float elapsed;
    private bool isPlaying;
    private Vector3 initialScale;

    private void Start()
    {
        // 获取材质实例（不影响原材质）
        var renderer = GetComponent<MeshRenderer>();
        if (renderer != null)
        {
            material = renderer.material; // 自动创建材质实例
            
            // 应用覆盖参数
            if (overrideColor.a > 0f)
            {
                material.SetColor("_RingColor", overrideColor);
            }
            
            if (overrideRingWidth > 0f)
            {
                material.SetFloat("_RingWidth", overrideRingWidth);
            }
            
            if (overrideRadius > 0f)
            {
                // 根据半径计算所需的Scale
                // Quad默认1x1，半径0.5，所以 Scale = radius * 2
                float scale = overrideRadius * 2f;
                transform.localScale = new Vector3(scale, scale, scale);
            }
            
            // 从0开始扩散
            material.SetFloat("_Progress", 0f);
            isPlaying = true;
            elapsed = 0f;
        }
        else
        {
            Debug.LogWarning("ShockwaveEffect: 找不到MeshRenderer组件");
            if (autoDestroy)
            {
                Destroy(gameObject);
            }
        }
    }

    private void Update()
    {
        if (!isPlaying || material == null)
        {
            return;
        }

        elapsed += Time.deltaTime;
        float progress = Mathf.Clamp01(elapsed / duration);
        
        // 更新Progress参数（0到1）
        material.SetFloat("_Progress", progress);

        // 扩散完成
        if (progress >= 1f)
        {
            isPlaying = false;
            
            if (autoDestroy)
            {
                Destroy(gameObject);
            }
        }
    }

    private void OnDestroy()
    {
        // 清理材质实例
        if (material != null)
        {
            Destroy(material);
        }
    }
    
    /// <summary>
    /// 快捷方法：设置扩散参数
    /// </summary>
    public void SetupEffect(float radius, float duration, Color color, float ringWidth = 0f)
    {
        this.overrideRadius = radius;
        this.duration = duration;
        this.overrideColor = color;
        if (ringWidth > 0f)
        {
            this.overrideRingWidth = ringWidth;
        }
    }
}