using UnityEngine;

public class MovingSphere : MonoBehaviour
{
    [SerializeField, Range(0f, 100f)]
    private float maxSpeed = 10f;

    [SerializeField, Range(0f, 100f)]
    private float maxAcceleration = 10f;

    [SerializeField, Range(0f, 1f)]
    private float bounciness = 0.5f;

    [SerializeField]
    private Rect allowedArea = new Rect(-5f, -5f, 10f, 10f);

    private Vector3 velocity;

    private void Update()
    {
        Vector2 playerInput;
        playerInput.x = Input.GetAxis("Horizontal");
        playerInput.y = Input.GetAxis("Vertical");
        playerInput = Vector2.ClampMagnitude(playerInput, 1f);
        var desiredVelocity = new Vector3(playerInput.x, 0f, playerInput.y) * maxSpeed;
        float maxSpeedChange = maxAcceleration * Time.deltaTime;
        velocity.x = Mathf.MoveTowards(velocity.x, desiredVelocity.x, maxSpeedChange);
        velocity.z = Mathf.MoveTowards(velocity.z, desiredVelocity.z, maxSpeedChange);
        var displacement = velocity * Time.deltaTime;
        var newPosition = transform.localPosition + displacement;
        if (newPosition.x < allowedArea.xMin)
        {
            newPosition.x = allowedArea.xMin;
            velocity.x = -velocity.x * bounciness;
        }
        else if (newPosition.x > allowedArea.xMax)
        {
            newPosition.x = allowedArea.xMax;
            velocity.x = -velocity.x * bounciness;
        }
        if (newPosition.z < allowedArea.yMin)
        {
            newPosition.z = allowedArea.yMin;
            velocity.z = -velocity.z * bounciness;
        }
        else if (newPosition.z > allowedArea.yMax)
        {
            newPosition.z = allowedArea.yMax;
            velocity.z = -velocity.z * bounciness;
        }
        if (!allowedArea.Contains(new Vector2(newPosition.x, newPosition.z)))
        {
            newPosition.x = Mathf.Clamp(newPosition.x, allowedArea.xMin, allowedArea.xMax);
            newPosition.z = Mathf.Clamp(newPosition.z, allowedArea.yMin, allowedArea.yMax);
        }
        transform.localPosition = newPosition;
    }
}