using UnityEngine;

public class RacingCamera : MonoBehaviour
{
    public enum CameraMode
    {
        Follow,
        Orbit,
        Hood,
        Bumper
    }

    [Header("Target")]
    public Transform carTarget;
    public Rigidbody carRigidbody;

    [Header("Camera Mode")]
    public CameraMode currentMode = CameraMode.Follow;
    public KeyCode switchKey = KeyCode.C;

    [Header("Follow Mode Settings")]
    public Vector3 followOffset = new Vector3(0, 3, -8);
    public float followSmoothTime = 0.1f;

    [Header("Orbit Mode Settings")]
    public float orbitDistance = 10f;
    public float orbitHeight = 3f;
    public float orbitSpeed = 2f;
    private float orbitAngle = 0f;

    [Header("First Person Settings")]
    public Transform hoodCameraPosition;
    public Transform bumperCameraPosition;

    [Header("Look Settings")]
    public float lookAheadDistance = 5f;
    public Vector3 lookAtOffset = new Vector3(0, 1.5f, 0);

    private Vector3 velocity = Vector3.zero;
    private Camera cam;

    void Start()
    {
        cam = GetComponent<Camera>();
        if (carRigidbody == null && carTarget != null)
            carRigidbody = carTarget.GetComponent<Rigidbody>();
    }

    void Update()
    {
        // Переключение режимов камеры
        if (Input.GetKeyDown(switchKey))
        {
            SwitchCameraMode();
        }
    }

    void LateUpdate()
    {
        if (carTarget == null) return;

        switch (currentMode)
        {
            case CameraMode.Follow:
                UpdateFollowCamera();
                break;

            case CameraMode.Orbit:
                UpdateOrbitCamera();
                break;

            case CameraMode.Hood:
                UpdateFirstPersonCamera(hoodCameraPosition);
                break;

            case CameraMode.Bumper:
                UpdateFirstPersonCamera(bumperCameraPosition);
                break;
        }
    }

    void SwitchCameraMode()
    {
        currentMode = (CameraMode)(((int)currentMode + 1) % 4);
        Debug.Log("Camera mode: " + currentMode);
    }

    void UpdateFollowCamera()
    {
        // Рассчитываем позицию с учетом скорости
        Vector3 targetPosition = CalculateFollowPosition();

        // Плавное перемещение
        transform.position = Vector3.SmoothDamp(
            transform.position,
            targetPosition,
            ref velocity,
            followSmoothTime
        );

        // Направление взгляда с опережением
        Vector3 lookTarget = carTarget.position +
                            carTarget.forward * lookAheadDistance +
                            lookAtOffset;

        transform.LookAt(lookTarget);
    }

    Vector3 CalculateFollowPosition()
    {
        Vector3 basePosition = carTarget.position +
                              carTarget.TransformDirection(followOffset);

        // Динамическое смещение на основе скорости
        if (carRigidbody != null)
        {
            float speedFactor = Mathf.Clamp01(carRigidbody.linearVelocity.magnitude / 50f);
            Vector3 speedOffset = carTarget.forward * speedFactor * -3f;
            basePosition += speedOffset;
        }

        return basePosition;
    }

    void UpdateOrbitCamera()
    {
        // Автоматическое вращение вокруг машины
        orbitAngle += orbitSpeed * Time.deltaTime;

        // Рассчитываем позицию по окружности
        float x = Mathf.Sin(orbitAngle) * orbitDistance;
        float z = Mathf.Cos(orbitAngle) * orbitDistance;

        Vector3 orbitPosition = carTarget.position +
                               new Vector3(x, orbitHeight, z);

        transform.position = orbitPosition;
        transform.LookAt(carTarget.position + lookAtOffset);
    }
 
void UpdateFirstPersonCamera(Transform cameraPosition)
    {
        if (cameraPosition == null)
        {
            // Резервная позиция
            transform.position = carTarget.position +
                                carTarget.forward * 1f +
                                Vector3.up * 1.5f;
            transform.rotation = carTarget.rotation;
            return;
        }

        transform.position = cameraPosition.position;
        transform.rotation = cameraPosition.rotation;

        // Добавляем небольшую тряску на скорости
        if (carRigidbody != null)
        {
            float shakeAmount = carRigidbody.linearVelocity.magnitude * 0.001f;
            transform.position += Random.insideUnitSphere * shakeAmount;
        }
    }

    // Визуализация в редакторе
    void OnDrawGizmosSelected()
    {
        if (carTarget != null)
        {
            Gizmos.color = Color.yellow;
            Gizmos.DrawWireSphere(carTarget.position + lookAtOffset, 0.5f);
            Gizmos.DrawLine(transform.position, carTarget.position + lookAtOffset);
        }
    }
}