using UnityEngine;

[RequireComponent(typeof(Camera))]
public class CameraController : MonoBehaviour
{
    [Header("Target")]
    [Tooltip("If set, camera will follow this Transform. Otherwise it will auto-find the local player.")]
    [SerializeField] private Transform target;

    [Header("Zoom Settings")]
    [SerializeField] private float baseDistance = 6f;
    [SerializeField] private float maxDistance = 12f;
    [SerializeField] private float zoomSpeed = 5f;

    [Header("Follow Settings")]
    [SerializeField] private float followSmoothness = 5f;
    [SerializeField] private Vector3 heightOffset = new Vector3(0, 3f, 0);

    private Rigidbody targetRb;
    private float currentDistance;
    private Camera cam;

    private void Start()
    {
        Application.targetFrameRate = 120;
        cam = GetComponent<Camera>();
        currentDistance = baseDistance;

        if (target != null)
        {
            // User assigned a target in the Inspector
            InitializeTarget();
        }
        else
        {
            // No target assigned, try to auto-find after a short delay
            Invoke(nameof(FindLocalPlayer), 0.5f);
        }
    }

    private void InitializeTarget()
    {
        targetRb = target.GetComponent<Rigidbody>();
        if (targetRb == null)
        {
            Debug.LogError("CameraController: Assigned target has no Rigidbody component.", this);
            enabled = false;
            return;
        }
        Debug.Log("CameraController: Following manually assigned target.", this);
    }

    private void FindLocalPlayer()
    {
        foreach (var vehicle in FindObjectsOfType<VehicleController>())
        {
            // VehicleController inherits NetworkBehaviour, so .Object is the NetworkObject
            if (vehicle.Object != null && vehicle.Object.HasInputAuthority)
            {
                target = vehicle.FollowTarget;
                InitializeTarget();
                Debug.Log("CameraController: Auto-found local player to follow.", this);
                return;
            }
        }

        Debug.LogWarning("CameraController: No local player found to follow — disabling.", this);
        enabled = false;
    }

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

        float speed = targetRb.velocity.magnitude;
        float targetDistance = Mathf.Lerp(baseDistance, maxDistance, speed / 30f);
        currentDistance = Mathf.Lerp(currentDistance, targetDistance, Time.deltaTime * zoomSpeed);

        Vector3 followPos = target.position
                          + heightOffset
                          - target.forward * currentDistance;

        transform.position = Vector3.Lerp(transform.position, followPos, Time.deltaTime * followSmoothness);
        transform.LookAt(target.position + heightOffset * 0.5f);
    }
}