using UnityEngine;

public class CameraFollow : MonoBehaviour
{
    [Header("跟随目标")]
    public Transform target;

    [Header("跟随参数")]
    public float distance = 10f;
    public float height = 5f;
    public float angle = 45f;
    public float smoothSpeed = 5f;

    [Header("视角参数")]
    public float lookAtHeightOffset = 1f;

    private Vector3 currentVelocity;

    private void LateUpdate()
    {
        if (target == null)
        {
            return;
        }

        float angleRad = angle * Mathf.Deg2Rad;
        
        float offsetX = -Mathf.Sin(angleRad) * distance;
        float offsetZ = -Mathf.Cos(angleRad) * distance;

        Vector3 targetPosition = target.position + new Vector3(offsetX, height, offsetZ);

        transform.position = Vector3.SmoothDamp(
            transform.position,
            targetPosition,
            ref currentVelocity,
            1f / smoothSpeed
        );

        Vector3 lookAtPosition = target.position + Vector3.up * lookAtHeightOffset;
        transform.LookAt(lookAtPosition);
    }

    public void SetTarget(Transform newTarget)
    {
        target = newTarget;
    }

    public void SetAngle(float newAngle)
    {
        angle = newAngle;
    }

    public void SetDistance(float newDistance)
    {
        distance = newDistance;
    }

    public void SetHeight(float newHeight)
    {
        height = newHeight;
    }
}