using UnityEngine;
using CnControls;
using Fusion;

public enum SurfaceDetection
{
    RayCast,
    SphereCast
}

public class VehicleController : NetworkBehaviour
{
    [SerializeField] float currentSpeed = 0f;
    [SerializeField] float steeringAI = 0f;
    [SerializeField] bool isAIControlled = false;
    [SerializeField] SurfaceDetection groundDetection = SurfaceDetection.RayCast;
    [SerializeField] LayerMask driveableSurface = -1;
    [SerializeField] float maxSpeed = 100f;
    [SerializeField] float baseAcceleration = 10f;
    [SerializeField] float steeringSensitivity = 10f;
    [SerializeField] float gravityForce = 9.8f;
    [SerializeField] float downforce = 5f;
    [SerializeField] float brakeThreshold = 30f;
    [SerializeField] float targetStoppingDistance = 5f;
    [SerializeField] bool allowAirControl = false;
    [SerializeField] AnimationCurve _frictionCurve = new AnimationCurve();
    [SerializeField] AnimationCurve _turnCurve = new AnimationCurve();

    [SerializeField, Range(0, 10)] float bodyTiltAmount = 0.5f;
    [SerializeField] Transform carBodyVisual = null;
    [SerializeField, Range(0.1f, 1f)] float skidMarkWidth = 0.25f;
    [SerializeField, Range(0.1f, 10f)] float skidMarkDuration = 5f;
    [SerializeField] Transform wheelFrontLeft = null;
    [SerializeField] Transform wheelFrontRight = null;
    [SerializeField] Transform wheelRearLeft = null;
    [SerializeField] Transform wheelRearRight = null;
    [SerializeField] Transform frontLeftAxle = null;
    [SerializeField] Transform frontRightAxle = null;
    [SerializeField] GameObject speedVisualEffects = null;

    [SerializeField] Rigidbody sphereRigidbody = null;
    [SerializeField] PhysicMaterial wheelFrictionMaterial = null;
    [SerializeField] Transform cameraFollowTarget = null;

    private bool isRunning = false;
    private bool isOnGround = false;
    private bool hasTurboBoost = true;
    public bool nosActive = false;

    private float accelerationInput = 0f;
    private float brakeInput = 0f;
    private float accelerationForce = 0f;
    private float steeringSign = 0f;
    private float inputHorizontal = 0f;
    private float inputVertical = 0f;
    private float wheelRadius = 0f;
    private float desiredTurnAngle = 0f;
    private float distanceToTarget = 0f;
    private float angleDifference = 0f;
    private float maxGroundDistance = 0f;
    private float counterSteerValue = 0f;
    private float steeringMultiplier = 0f;

    private Vector3 velocityLocal = Vector3.zero;
    private Vector3 forwardDirection = Vector3.zero;
    private Vector3 directionToTarget = Vector3.zero;
    private Vector3 movementDirection = Vector3.zero;

    private RaycastHit surfaceHit;
    private Rigidbody vehicleRigidbody = null;
    private VehicleTracker targetTracker = null;

    public bool AIControlled => isAIControlled;
    public bool Running => isRunning;
    public bool Grounded => isOnGround;
    public float SkidWidth => skidMarkWidth;
    public float SkidDuration => skidMarkDuration;
    public float CurrentSpeed => velocityLocal.z;
    public float MaximumSpeed => maxSpeed;
    public bool InputsActive => inputHorizontal != 0 || inputVertical != 0 || nosActive;
    public NOSController nosController;
    internal float SteeringSensitivity
    {
        get => steeringSensitivity;
        set => steeringSensitivity = value;
    }

    public Vector3 LocalVelocity => velocityLocal;
    public Transform FollowTarget => cameraFollowTarget;
    [Range(0.3f, 1f)] public float steeringFactor = 1f;
    public override void Spawned()
    {
        base.Spawned();
        InitializeVehicle();
    }


    // 1) Fusion will call this every tick to collect local input

    // 2) Fusion runs your simulation here instead of Update/FixedUpdate
    public override void FixedUpdateNetwork()
    {
        if (!isRunning || !RaceCountdownManager.Instance || !RaceCountdownManager.Instance.RaceStarted)
            return;

        if (Object.HasInputAuthority && GetInput(out CarNetworkInput data))
        {
            inputHorizontal = data.Horizontal;
            inputVertical = data.Vertical;

            if (data.NOS)
                ActivateNOS();
        }

        CheckGround();
        HandleMovement();
        UpdateVisuals();
    }
    private void Awake()
    {
        vehicleRigidbody = GetComponent<Rigidbody>();
        targetTracker = GetComponent<VehicleTracker>();
        wheelRadius = sphereRigidbody.GetComponent<SphereCollider>().radius;
        nosController = GetComponent<NOSController>();
        maxGroundDistance = wheelRadius + 0.5f;
        InitializeVehicle();
    }

    public void InitializeVehicle()
    {
        isRunning = true;
        if (!isAIControlled)
            accelerationForce = baseAcceleration;
    }

    public void StopVehicle()
    {
        isRunning = false;
        velocityLocal = Vector3.zero;
        currentSpeed = 0f;
        steeringAI = 0f;
    }

    //private void Update()
    //{
    //    if (!isRunning) return;
    //    UpdateVisuals();
    //    ProcessInputs();
    //    ApplyControls();
    //}

    private void ProcessInputs()
    {
        inputVertical = CnInputManager.GetAxis("Vertical");
        inputHorizontal = CnInputManager.GetAxis("Horizontal");
    }

    private void UpdateVisuals()
    {
        counterSteerValue = (Mathf.Abs(velocityLocal.x) > 20f) ? -1f : 1f;

        if (wheelFrontLeft) wheelFrontLeft.localRotation = Quaternion.Slerp(wheelFrontLeft.localRotation, Quaternion.Euler(0, 45f * counterSteerValue * steeringAI, 0), 0.1f);
        if (wheelFrontRight) wheelFrontRight.localRotation = Quaternion.Slerp(wheelFrontRight.localRotation, Quaternion.Euler(0, 45f * counterSteerValue * steeringAI, 0), 0.1f);

        frontLeftAxle?.Rotate(Vector3.right * (CurrentSpeed * 0.75f));
        frontRightAxle?.Rotate(Vector3.right * (CurrentSpeed * 0.75f));
        wheelRearLeft?.Rotate(Vector3.right * (CurrentSpeed * 0.75f));
        wheelRearRight?.Rotate(Vector3.right * (CurrentSpeed * 0.75f));

        if (carBodyVisual)
        {
            if (velocityLocal.z > 1)
                carBodyVisual.localRotation = Quaternion.Slerp(carBodyVisual.localRotation,
                    Quaternion.Euler(Mathf.Lerp(0, -5, velocityLocal.z / maxSpeed), 0, Mathf.Clamp(desiredTurnAngle * steeringAI, -bodyTiltAmount, bodyTiltAmount)), 0.05f);
            else
                carBodyVisual.localRotation = Quaternion.Slerp(carBodyVisual.localRotation, Quaternion.identity, 0.05f);
        }

        if (speedVisualEffects)
            speedVisualEffects.SetActive(velocityLocal.z > 10);
    }

    private void ApplyControls()
    {
        Vector3 targetPoint = targetTracker.TargetPos;
        targetPoint.y = transform.position.y;
        directionToTarget = (targetPoint - transform.position).normalized;
        forwardDirection = transform.forward.normalized;

        desiredTurnAngle = Mathf.Abs(Vector3.Angle(forwardDirection, Vector3.ProjectOnPlane(directionToTarget, transform.up)));
        distanceToTarget = Vector3.Distance(transform.position, targetTracker.TargetPos);
        movementDirection = (targetTracker.TargetPos - transform.position).normalized;
        float alignment = Vector3.Dot(transform.forward, movementDirection);
        angleDifference = Vector3.Angle(transform.forward, movementDirection);

        brakeInput = 0f;

        if (distanceToTarget > targetStoppingDistance)
        {
            accelerationInput = alignment > 0f ? inputVertical : (distanceToTarget > 5f ? inputVertical : -1f);
            steeringAI = (Vector3.SignedAngle(transform.forward, movementDirection, Vector3.up) > 0f ? 1f : -1f)
                        * _turnCurve.Evaluate(desiredTurnAngle / 160f);
        }
        else
        {
            steeringAI = 0f;
        }

        if (!isAIControlled)
            steeringAI += inputHorizontal;

        currentSpeed = Mathf.Round(CurrentSpeed);
    }

    //private void FixedUpdate()
    //{
    //    if (!isRunning) return;
    //    CheckGround();
    //    HandleMovement();
    //}

    private void CheckGround()
    {
        if (groundDetection == SurfaceDetection.RayCast)
        {
            isOnGround = Physics.Raycast(sphereRigidbody.position, Vector3.down, out surfaceHit, maxGroundDistance, driveableSurface)
                      || Physics.Raycast(sphereRigidbody.position + Vector3.forward * 3f, Vector3.down, out surfaceHit, maxGroundDistance, driveableSurface)
                      || Physics.Raycast(sphereRigidbody.position - Vector3.forward * 3f, Vector3.down, out surfaceHit, maxGroundDistance, driveableSurface);
        }
        else if (groundDetection == SurfaceDetection.SphereCast)
        {
            isOnGround = Physics.SphereCast(sphereRigidbody.position + wheelRadius * Vector3.up, wheelRadius + 0.25f, -transform.up, out surfaceHit, maxGroundDistance, driveableSurface);
        }
        else isOnGround = false;
    }

    private void HandleMovement()
    {
        velocityLocal = vehicleRigidbody.transform.InverseTransformDirection(vehicleRigidbody.velocity);

        if (angleDifference > brakeThreshold && velocityLocal.z > 15f)
        {
            wheelFrictionMaterial.dynamicFriction = 0.01f;
        }
        else
        {
            wheelFrictionMaterial.dynamicFriction = _frictionCurve.Evaluate(Mathf.Abs(velocityLocal.x / 100));
        }

        steeringMultiplier = _turnCurve.Evaluate(velocityLocal.magnitude / maxSpeed);

        if (Grounded)
        {
            steeringSign = Mathf.Sign(velocityLocal.z);

            if (Mathf.Abs(accelerationInput) > 0.1f)
                vehicleRigidbody.AddTorque(Vector3.up * (steeringAI * steeringSign * steeringSensitivity * 100f * steeringMultiplier * steeringFactor));

            if (Mathf.Abs(accelerationInput) > 0.1f)
                sphereRigidbody.velocity = Vector3.Lerp(sphereRigidbody.velocity, vehicleRigidbody.transform.forward * (accelerationInput * maxSpeed), accelerationForce / 10f * Time.fixedDeltaTime);

            sphereRigidbody.AddForce(-transform.up * (downforce * sphereRigidbody.mass));
            vehicleRigidbody.MoveRotation(Quaternion.Slerp(vehicleRigidbody.rotation, Quaternion.FromToRotation(vehicleRigidbody.transform.up, surfaceHit.normal) * vehicleRigidbody.transform.rotation, 0.12f));
        }
        else
        {
            if (allowAirControl)
                vehicleRigidbody.AddTorque(Vector3.up * (steeringAI * steeringSensitivity * 100f * steeringMultiplier * steeringFactor));

            sphereRigidbody.velocity = Vector3.Lerp(sphereRigidbody.velocity, (vehicleRigidbody.transform.forward * (accelerationInput * maxSpeed)) + Vector3.down * (gravityForce * 9.8f), (accelerationForce / 25f) * Time.deltaTime);
        }
    }

    internal void DisableVehicle()
    {
        enabled = false;
        sphereRigidbody.gameObject.SetActive(false);
        sphereRigidbody.velocity = Vector3.zero;
        sphereRigidbody.Sleep();
        vehicleRigidbody.velocity = Vector3.zero;
        vehicleRigidbody.Sleep();
    }

    public void ActivateNOS()
    {
        ActivateNOS(true);
        //nosController._isBoosting = true;
    }

    public void ActivateNOS(bool active, float bonusAcceleration = 10f)
    {
        nosActive = active;
        accelerationForce = active ? accelerationForce + bonusAcceleration : baseAcceleration;
    }

    internal void EnableVehicle()
    {
        enabled = true;
        sphereRigidbody.gameObject.SetActive(true);
    }
}