using UnityEngine;

public class HomingEffect : BallEffectBase
{
    private float _retargetTimer;
    private blockScript _targetBlock;
    private HomingEffectDefinition Config => definition as HomingEffectDefinition;

    public override void OnBallReset(BallScript ball)
    {
        _retargetTimer = 0f;
        _targetBlock = null;
    }

    public override void ModifyVelocity(BallScript ball, ref Vector2 velocity, float deltaTime)
    {
        HomingEffectDefinition config = Config;
        if (config == null)
            return;

        if (velocity.sqrMagnitude < 0.0001f)
            return;

        _retargetTimer += deltaTime;
        if (_targetBlock == null || _retargetTimer >= config.RetargetInterval)
        {
            _retargetTimer = 0f;
            _targetBlock = FindClosestBlock(ball.transform.position);
        }

        if (_targetBlock == null)
            return;

        Vector2 currentDir = velocity.normalized;
        Vector2 targetDir = ((Vector2)_targetBlock.transform.position - (Vector2)ball.transform.position).normalized;

        float maxRadians = config.TurnRateDegreesPerSecond * Mathf.Deg2Rad * deltaTime;
        Vector3 steered = Vector3.RotateTowards(currentDir, targetDir, maxRadians, 0f);
        velocity = ((Vector2)steered).normalized * velocity.magnitude;
    }

    private static blockScript FindClosestBlock(Vector2 position)
    {
        blockScript[] blocks = FindObjectsByType<blockScript>(FindObjectsSortMode.None);
        blockScript best = null;
        float bestSqrDistance = float.MaxValue;

        for (int i = 0; i < blocks.Length; i++)
        {
            blockScript b = blocks[i];
            if (b == null)
                continue;

            float sqrDist = ((Vector2)b.transform.position - position).sqrMagnitude;
            if (sqrDist < bestSqrDistance)
            {
                bestSqrDistance = sqrDist;
                best = b;
            }
        }

        return best;
    }
}