using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class vehicleGravityControl : gravityObjectManager
{
    [Header ("Main Settings")]
    [Space]

    public bool useGravity = true;

    public float gravityForce = 9.8f;

    public bool searchNewSurfaceOnHighFallSpeed = true;
    public bool shakeCameraOnHighFallSpeed = true;
    public float minSpeedToShakeCamera = 10;

    public bool checkSurfaceBelowOnRegularState;
    public float timeToSetNullParentOnAir = 0.5f;
    float lastTimeParentFound;

    public bool changeDriverGravityWhenGetsOff = true;

    public bool setVehicleRegularGravityOnDriverGetOff;

    [Space]
    [Header ("Circumnavigation Settings")]
    [Space]

    public float circumnavigateRotationSpeed = 10;
    public bool circumnavigateCurrentSurfaceActive;
    public bool useLerpRotation;

    public bool checkSurfaceBelowLedge;
    public float surfaceBelowLedgeRaycastDistance = 3;
    public float belowLedgeRotationSpeed = 10;

    public float minAngleDifferenceToAdhereToSurface = 4;

    [Space]
    [Header ("Current Normal/Gravity Settings")]
    [Space]

    public Vector3 regularGravity = new Vector3 (0, 1, 0);
    public Vector3 currentNormal = new Vector3 (0, 1, 0);

    [Space]
    [Header ("Gravity At Start Settings")]
    [Space]

    public bool startWithNewGravity;
    public bool useVehicleRotation;
    public bool adjustRotationToSurfaceFound;
    public Vector3 newGravityToStart;

    [Space]
    [Header ("Others Settings")]
    [Space]

    public otherSettings settings;

    [Space]
    [Header ("Debug")]
    [Space]

    public bool gravityControlEnabled;
    public bool OnGround;
    public bool gravityPowerActive;

    public bool powerActivated;
    public bool recalculatingSurface;
    public bool searchingSurface;
    public bool searchingNewSurfaceBelow;
    public bool searchAround;
    public bool rotating;

    public bool circumnavigableSurfaceFound;

    public bool useCenterPointActive;
    public Transform currentCenterPoint;

    [Space]
    [Header ("Gizmo Settings")]
    [Space]

    public bool showGizmo;

    [Space]
    [Header ("Components")]
    [Space]

    public Transform gravityAdherenceRaycastParent;
    public Transform surfaceBelowRaycastTransform;

    public vehicleController mainVehicleController;
    public Collider gravityCenterCollider;
    public Rigidbody mainRigidbody;
    public vehicleCameraController vehicleCameraManager;
    public vehicleHUDManager HUDManager;
    public inputActionManager actionManager;

    Vector3 previousNormalDetected;

    Transform vehicleCamera;


    bool conservateSpeed;
    bool accelerating;
    Vector3 forwardAxisCamera;
    Vector3 rightAxisCamera;
    Vector3 forwardAxisMovement;
    Vector3 surfaceNormal;
    Vector3 previousVelocity;
    float normalGravityMultiplier;
    float horizontalAxis;
    float verticalAxis;
    Transform pivot;

    GameObject fatherDetected;

    RaycastHit hit;
    Coroutine rotateCharacterState;

    Vector2 axisValues;

    Coroutine rotateVehicleCoroutine;

    bool gravityForcePaused;

    bool onGroundChecked;
    float currentCircumnagivateRotationSpeed;

    bool surfaceFound;
    RaycastHit currentSurfaceFound;
    Vector3 currentPosition;
    Vector3 rayPosition;
    Vector3 rayDirection;
    float gravityAdherenceRaycastParentAngleRotation;

    bool checkDownSpeedActive = true;

    GameObject currentObjectBelowVehicle;
    GameObject previousSurfaceBelowVehicle;

    Vector3 pos;
    Vector3 dir;

    Vector3 currentUp;

    bool mainVehicleControllerLocated;

    float originalGravityForce;

    bool addPreviousVelocityMagnitude;
    float previousVelocityMagnitude;

    float lastTimeRotateVehicleToRaycastDirection;


    void Start ()
    {
        //set the current normal in the vehicle controller
        if (mainVehicleController == null) {
            mainVehicleController = GetComponent<vehicleController> ();
        }

        mainVehicleControllerLocated = mainVehicleController != null;

        if (mainVehicleControllerLocated) {
            mainVehicleController.setNormal (currentNormal);
        }

        if (startWithNewGravity) {
            if (useVehicleRotation) {
                currentUp = transform.up;

                Vector3 normalDirection = -currentUp;

                if (adjustRotationToSurfaceFound) {
                    if (Physics.Raycast (transform.position, -currentUp, out hit, Mathf.Infinity, settings.layer)) {
                        normalDirection = hit.normal;
                    }
                }

                if (currentUp != currentNormal) {
                    setCustomNormal (normalDirection);
                }
            } else {
                setCustomNormal (newGravityToStart);
            }
        }

        vehicleCamera = vehicleCameraManager.transform;

        originalGravityForce = gravityForce;
    }

    void Update ()
    {
        currentPosition = transform.position;

        //if the vehicle is searching a new surface
        if (searchingSurface) {
            //set the vehicle movement direction in the air (local X and Y axis)
            forwardAxisCamera = pivot.TransformDirection (Vector3.up);
            rightAxisCamera = pivot.TransformDirection (Vector3.right);

            //new position and direction of a raycast to detect a surface
            pos = Vector3.zero;
            dir = Vector3.zero;

            //if the player has activate the gravity control in the vehicle, then apply force in the camera direction and set the raycast position in the center of mass
            if (!searchingNewSurfaceBelow) {
                //this function apply force to the vehicle in the new direction and allows to move it in the air in the left, right, forward and backward direction using the direction
                //of the movement as local Y axis
                moveInTheAir ((gravityForce * (mainRigidbody.mass / settings.massDivider) * settings.speed) * forwardAxisMovement, settings.speed, mainRigidbody.mass / settings.massDivider, forwardAxisMovement);

                pos = settings.centerOfMass.position;

                dir = forwardAxisMovement;
            }
            //else, the player is falling in the air while the gravity control was enabled, so the ray direction is the negavite local Y axis or -currentNormal and the position is the 
            //vehicle itself
            else {
                pos = currentPosition;
                dir = -currentNormal;
            }

            if (showGizmo) {
                Debug.DrawRay (pos, settings.vehicleRadius * dir, Color.yellow);
            }

            //if the raycast found a new surface, then
            if (Physics.Raycast (pos, dir, out hit, settings.vehicleRadius, settings.layer)) {
                //check is not a trigger or a rigidbody
                if (!hit.collider.isTrigger && hit.rigidbody == null) {
                    //a new valid surface has been detected, so stop the search of a new surface

                    searchingNewSurfaceBelow = false;
                    searchingSurface = false;
                    searchAround = false;
                    powerActivated = false;

                    //set to 0 the vehicle velocity
                    mainRigidbody.linearVelocity = Vector3.zero;

                    //disable the collider in the center of mass
                    gravityCenterCollider.enabled = false;

                    //if the surface can be circumnavigate
                    if (hit.collider.gameObject.CompareTag (settings.tagForCircumnavigate)) {
                        circumnavigableSurfaceFound = true;
                    }

                    //if the surface is moving
                    if (hit.collider.gameObject.CompareTag (settings.tagForMovingObjects)) {
                        addParent (hit.collider.gameObject);
                    }

                    //if the new normal is different from the current normal, which means that is other surface inclination, then 
                    if (hit.normal != currentNormal) {
                        //rotate the vehicle according to that normal
                        if (rotateVehicleCoroutine != null) {
                            StopCoroutine (rotateVehicleCoroutine);
                        }

                        rotateVehicleCoroutine = StartCoroutine (rotateToSurface (hit.normal, 2));
                    }

                    //disable the gravity control in the vehicle controller
                    if (mainVehicleControllerLocated) {
                        mainVehicleController.changeGravityControlUse (false);
                    }

                    vehicleCameraManager.usingBoost (false, "StopShake", true, true);
                }
            }
        }

        //if the gravity control is enabled, and the vehicle falls in its negative loxal Y axis, 
        //then check if there is any surface below the vehicle which will become the new ground surface
        //in case the vehicle reachs a certain velocity
        if (!OnGround && !powerActivated) {
            if (checkDownSpeedActive && shakeCameraOnHighFallSpeed && transform.InverseTransformDirection (mainRigidbody.linearVelocity).y < -minSpeedToShakeCamera) {
                vehicleCameraManager.usingBoost (true, "Regular Gravity Control", true, true);
            }

            if (searchNewSurfaceOnHighFallSpeed && transform.InverseTransformDirection (mainRigidbody.linearVelocity).y < -settings.velocityToSearch && !searchingNewSurfaceBelow && !powerActivated) {
                //check that the current normal is not the regular one
                if (currentNormal != regularGravity) {
                    //enable the collider in the center of mass
                    gravityCenterCollider.enabled = true;

                    //searching a new surface
                    searchingNewSurfaceBelow = true;
                    searchingSurface = true;

                    //stop to recalculate the normal of the vehicle
                    recalculatingSurface = false;
                    circumnavigableSurfaceFound = false;

                    //enable the gravity control in the vehicle controller
                    if (mainVehicleControllerLocated) {
                        mainVehicleController.changeGravityControlUse (true);
                    }
                }
            }
        }

        //if the vehicle is above a circumnavigable object, then recalculate the current normal of the vehicle according to the surface normal under the vehicle
        if (!searchingSurface && (circumnavigableSurfaceFound || fatherDetected != null) && recalculatingSurface) {
            //set the distance of the ray, if the vehicle is not on the ground, the distance is higher
            float distance = settings.rayDistance + 0.05f;
            if (!OnGround) {
                distance = 10;
            }

            surfaceFound = false;

            //if the vehicle founds a surface below it, get its normal
            if (Physics.Raycast (settings.centerOfMass.position, -currentNormal, out hit, distance, settings.layer)) {
                currentSurfaceFound = hit;
                surfaceFound = true;
                currentCircumnagivateRotationSpeed = circumnavigateRotationSpeed;
            }

            currentUp = transform.up;

            //Get the correct raycast orientation according to input, for example, it is no the same ray position and direction if the vehicle is moving forward or backward
            if (checkSurfaceBelowLedge) {
                rayPosition = currentPosition + 0.1f * currentUp;

                gravityAdherenceRaycastParentAngleRotation = Vector3.SignedAngle (transform.forward, mainRigidbody.linearVelocity, currentUp);

                gravityAdherenceRaycastParent.localRotation = Quaternion.Euler (new Vector3 (0, gravityAdherenceRaycastParentAngleRotation, 0));
            }

            if (checkSurfaceBelowLedge) {
                rayDirection = -currentUp;

                if (showGizmo) {
                    Debug.DrawRay (rayPosition, rayDirection, Color.white);
                }

                if (!Physics.Raycast (rayPosition, rayDirection, out hit, 1, settings.layer)) {
                    if (showGizmo) {
                        Debug.DrawRay (rayPosition, rayDirection, Color.green);
                    }

                    rayPosition = surfaceBelowRaycastTransform.position;
                    rayDirection = surfaceBelowRaycastTransform.forward;

                    if (Physics.Raycast (rayPosition, rayDirection, out hit, surfaceBelowLedgeRaycastDistance, settings.layer)) {
                        if (showGizmo) {
                            Debug.DrawRay (rayPosition, hit.distance * rayDirection, Color.yellow);
                        }

                        currentSurfaceFound = hit;
                        surfaceFound = true;
                        currentCircumnagivateRotationSpeed = belowLedgeRotationSpeed;
                    } else {
                        if (showGizmo) {
                            Debug.DrawRay (rayPosition, surfaceBelowLedgeRaycastDistance * rayDirection, Color.red);
                        }
                    }
                } else {
                    if (showGizmo) {
                        Debug.DrawRay (rayPosition, hit.distance * rayDirection, Color.red);
                    }
                }
            }

            if (surfaceFound) {
                if (!currentSurfaceFound.collider.isTrigger && currentSurfaceFound.rigidbody == null) {
                    //the object detected can be circumnavigate, so get the normal direction
                    if (currentSurfaceFound.collider.gameObject.CompareTag (settings.tagForCircumnavigate)) {

                        if (useCenterPointActive) {
                            Vector3 heading = settings.centerOfMass.position - currentCenterPoint.transform.position;

                            surfaceNormal = heading / heading.magnitude;

                        } else {
                            surfaceNormal = currentSurfaceFound.normal;
                        }
                    }

                    //the object is moving, so get the normal direction and set the player as a children of the moving obejct
                    else if (currentSurfaceFound.collider.gameObject.CompareTag (settings.tagForMovingObjects)) {
                        if (useCenterPointActive) {
                            Vector3 heading = settings.centerOfMass.position - currentCenterPoint.transform.position;

                            surfaceNormal = heading / heading.magnitude;

                        } else {
                            surfaceNormal = currentSurfaceFound.normal;
                        }

                        if (fatherDetected == null) {
                            addParent (currentSurfaceFound.collider.gameObject);
                        }
                    }
                }
            } else {
                if (fatherDetected != null) {
                    removeParent ();
                }
            }


            if (useLerpRotation) {
                //set the current normal according to the hit.normal
                currentNormal = Vector3.Lerp (currentNormal, surfaceNormal, currentCircumnagivateRotationSpeed * Time.deltaTime);

                if (Vector3.Angle (previousNormalDetected, surfaceNormal) > minAngleDifferenceToAdhereToSurface) {
                    previousNormalDetected = surfaceNormal;

                    Vector3 myForward = Vector3.Cross (transform.right, currentNormal);
                    Quaternion dstRot = Quaternion.LookRotation (myForward, currentNormal);
                    transform.rotation = Quaternion.Lerp (transform.rotation, dstRot, currentCircumnagivateRotationSpeed * Time.deltaTime);
                    Vector3 myForwardCamera = Vector3.Cross (vehicleCamera.right, currentNormal);
                    Quaternion dstRotCamera = Quaternion.LookRotation (myForwardCamera, currentNormal);
                    vehicleCamera.rotation = Quaternion.Lerp (vehicleCamera.rotation, dstRotCamera, currentCircumnagivateRotationSpeed * Time.deltaTime);
                }
            } else {
                //set the current normal according to the hit.normal
                currentNormal = Vector3.Slerp (currentNormal, surfaceNormal, currentCircumnagivateRotationSpeed * Time.deltaTime);

                if (Vector3.Angle (previousNormalDetected, currentNormal) > minAngleDifferenceToAdhereToSurface) {
                    previousNormalDetected = surfaceNormal;

                    Vector3 myForward = Vector3.Cross (transform.right, currentNormal);
                    Quaternion dstRot = Quaternion.LookRotation (myForward, currentNormal);
                    transform.rotation = Quaternion.Slerp (transform.rotation, dstRot, currentCircumnagivateRotationSpeed * Time.deltaTime);
                }

                Vector3 myForwardCamera = Vector3.Cross (vehicleCamera.right, currentNormal);
                Quaternion dstRotCamera = Quaternion.LookRotation (myForwardCamera, currentNormal);

                vehicleCamera.rotation = Quaternion.Slerp (vehicleCamera.rotation, dstRotCamera, currentCircumnagivateRotationSpeed * Time.deltaTime);
            }

            if (mainVehicleControllerLocated) {
                mainVehicleController.setNormal (currentNormal);
            }
        }

        //if the vehicle is being rotated to a new surface, set its velocity to 0
        if (rotating) {
            mainRigidbody.linearVelocity = Vector3.zero;
        }

        if ((gravityPowerActive || circumnavigateCurrentSurfaceActive) && !powerActivated) {
            if (currentObjectBelowVehicle != null) {
                //check if the object detected can be circumnavigate
                if (currentObjectBelowVehicle.CompareTag (settings.tagForCircumnavigate)) {
                    circumnavigableSurfaceFound = true;
                } else {
                    circumnavigableSurfaceFound = false;
                }

                //check if the object is moving to parent the player inside it
                if (currentObjectBelowVehicle.CompareTag (settings.tagForMovingObjects)) {
                    if (previousSurfaceBelowVehicle != currentObjectBelowVehicle) {
                        previousSurfaceBelowVehicle = currentObjectBelowVehicle;

                        addParent (currentObjectBelowVehicle);
                    }
                } else if (fatherDetected != null && !currentObjectBelowVehicle.transform.IsChildOf (fatherDetected.transform)) {
                    removeParent ();
                }

                //if the surface where the player lands can be circumnavigated or an moving/rotating object, then keep recalculating the player throught the normal surface
                if (circumnavigableSurfaceFound || fatherDetected != null) {
                    recalculatingSurface = true;
                }
                //else disable this state
                else {
                    recalculatingSurface = false;
                }
            } else {
                if (previousSurfaceBelowVehicle != null) {
                    previousSurfaceBelowVehicle = null;
                }

                if (rotating) {
                    circumnavigableSurfaceFound = false;
                }
            }
        } else {
            if ((circumnavigableSurfaceFound || fatherDetected != null) && rotating) {
                circumnavigableSurfaceFound = false;
            }

            if (checkSurfaceBelowOnRegularState && !gravityPowerActive && !HUDManager.isVehicletAsChildOfParent ()) {
                if (currentObjectBelowVehicle != null) {
                    //check if the object is moving to parent the player inside it
                    if (currentObjectBelowVehicle.CompareTag (settings.tagForMovingObjects)) {
                        if (previousSurfaceBelowVehicle != currentObjectBelowVehicle) {
                            previousSurfaceBelowVehicle = currentObjectBelowVehicle;

                            addParent (currentObjectBelowVehicle);

                            lastTimeParentFound = Time.time;
                        }
                    } else if (fatherDetected != null && !currentObjectBelowVehicle.transform.IsChildOf (fatherDetected.transform)) {
                        removeParent ();
                    }

                } else {
                    if (previousSurfaceBelowVehicle != null) {
                        previousSurfaceBelowVehicle = null;
                    }

                    if (Time.time > timeToSetNullParentOnAir + lastTimeParentFound) {
                        removeParent ();
                    }
                }
            }
        }
    }

    void FixedUpdate ()
    {
        // If the gravity control is not being used
        if (!powerActivated && !gravityForcePaused) {
            // Apply force to the vehicle in the negative local Y axis, so the vehicle has a regular gravity
            if (useGravity) {
                mainRigidbody.AddForce ((-gravityForce * mainRigidbody.mass * settings.gravityMultiplier) * currentNormal);
            }

            // If the vehicle is search a new surface, and previously the gravity control was enabled, then 
            if (searchingNewSurfaceBelow) {
                // Apply force in the negative local Y axis of the vehicle, and allow to move it left, right, backward and forward
                moveInTheAir (mainRigidbody.linearVelocity, 1, 1, -currentNormal);
            }

            // Check if the vehicle is on the ground
            OnGround = false;

            // Use a raycast to it, with the center of the mass as position and the negative local Y axis as direction, using the ray distance configured in the inspector
            if (Physics.Raycast (settings.centerOfMass.position, -currentNormal, out hit, settings.rayDistance, settings.layer)) {
                if (showGizmo) {
                    Debug.DrawLine (settings.centerOfMass.position, hit.point, Color.cyan);
                }

                // If the hit is not a trigger
                if (!hit.collider.isTrigger) {
                    // The vehicle is on the ground
                    OnGround = true;

                    currentObjectBelowVehicle = hit.collider.gameObject;
                }
            } else {
                // Else the vehicle is in the air
                OnGround = false;

                currentObjectBelowVehicle = null;
            }
        } else {
            // The vehicle is searching a new surface, so it is in the air
            OnGround = false;
        }

        if (OnGround) {
            if (!onGroundChecked) {

                vehicleCameraManager.usingBoost (false, "stopShake", true, true);

                onGroundChecked = true;

                // If the gravity control is enabled, and the surface below the vehicle can be circumnavigate or is a moving object, allow to recalculate the normal
                if ((circumnavigableSurfaceFound || fatherDetected != null) && gravityPowerActive) {
                    recalculatingSurface = true;
                } else {
                    recalculatingSurface = false;
                }
            }
        } else {
            if (onGroundChecked) {
                onGroundChecked = false;
            }
        }
    }

    void moveInTheAir (Vector3 newVel, float speedMultiplier, float massMultiplier, Vector3 movementDirection)
    {
        //get the new velocity to apply to the vehicle
        Vector3 newVelocity = newVel;

        //get the current values of the horizontal and vertical axis, from the input manager
        if (actionManager != null) {
            axisValues = actionManager.getPlayerMovementAxis ();
        } else {
            axisValues = Vector3.zero;
        }

        horizontalAxis = axisValues.x;
        verticalAxis = axisValues.y;

        //allow to move the vehicle in its local X and Y axis while he falls or move in the air using the gravity control
        Vector3 newmoveInput = verticalAxis * forwardAxisCamera + horizontalAxis * rightAxisCamera;

        if (newmoveInput.magnitude > 1) {
            newmoveInput.Normalize ();
        }

        //if the input axis are being used, set that movement to the vehicle
        if (newmoveInput.magnitude > 0) {
            newVelocity += (settings.speed * (mainRigidbody.mass / settings.massDivider) * speedMultiplier) * newmoveInput;
        }

        //if the player is accelerating in the air, add more velocity to the vehicle
        if (accelerating) {
            newVelocity += (settings.accelerateSpeed * massMultiplier) * forwardAxisMovement;
        }

        //if the current local Y velocity is lower than the limit, clamp the velocity
        if (Mathf.Abs (transform.InverseTransformDirection (newVelocity).y) > 40) {
            newVelocity -= Mathf.Abs (transform.InverseTransformDirection (newVelocity).y) * movementDirection;
            newVelocity += 40 * movementDirection;
        }

        //set the new velocity to the vehicle
        mainRigidbody.linearVelocity = Vector3.Lerp (mainRigidbody.linearVelocity, newVelocity, Time.deltaTime * 2);
    }

    //when the colliders of the vehicle hits another surface
    public void setCollisionDetected (Collision currentCollision)
    {
        //if the vehicle was searching a new surface using the gravity control, then
        if (searchingSurface && searchAround) {
            //check the type of collider
            if (!currentCollision.gameObject.CompareTag ("Player") && currentCollision.rigidbody == null && !currentCollision.collider.isTrigger) {
                //using the collision contact, get the direction of that new surface, so the vehicle change its movement to the position of that surface
                //like this the searching of a new surface is more accurate, since a raycast and collisions are used to detect the new surface
                Vector3 hitDirection = currentCollision.contacts [0].point - settings.centerOfMass.position;

                //set the current direction of the vehicle
                hitDirection = hitDirection / hitDirection.magnitude;
                forwardAxisMovement = hitDirection;

                //stop to search collisions around the vehicle
                searchAround = false;
            }
        }
    }

    //set and remove the parent of the vehicle according to the type of surface
    void addParent (GameObject obj)
    {
        fatherDetected = obj;

        parentAssignedSystem currentParentAssignedSystem = obj.GetComponent<parentAssignedSystem> ();

        if (currentParentAssignedSystem != null) {
            fatherDetected = currentParentAssignedSystem.getAssignedParent ();
        }

        setFatherDetectedAsParent ();
    }

    void removeParent ()
    {
        setNullParent ();

        fatherDetected = null;
    }

    public void setFatherDetectedAsParent ()
    {
        transform.SetParent (fatherDetected.transform);

        vehicleCamera.SetParent (fatherDetected.transform);
    }

    public void setNullParent ()
    {
        transform.SetParent (null);
        vehicleCamera.SetParent (null);
    }

    //activate the collider in the center of mass of the vehicle to dectect collisions with a new surface when the gravity control is enabled
    IEnumerator activateCollider ()
    {
        //wait to avoid enable the collider when the vehicle stills in the ground
        yield return new WaitForSeconds (0.2f);

        //if the vehicle is searching surface, then active the collider
        if (searchingSurface || searchingNewSurfaceBelow || searchAround) {
            gravityCenterCollider.enabled = true;
        }
    }

    //enable the gravity control in the direction of the camera
    public void activateGravityPower (Vector3 dir, Vector3 right)
    {
        StartCoroutine (activateCollider ());

        searchingNewSurfaceBelow = false;

        removeParent ();

        circumnavigableSurfaceFound = false;

        searchingSurface = true;

        searchAround = true;

        gravityPowerActive = true;

        forwardAxisMovement = dir;

        rightAxisCamera = right;

        powerActivated = true;

        //enable the gravity control in the vehicle controller
        vehicleCameraManager.usingBoost (true, "Regular Gravity Control", true, true);

        if (mainVehicleControllerLocated) {
            mainVehicleController.changeGravityControlUse (true);
        }
    }

    //disaable the gravity control, rotatin the vehicle to the regular gravity
    public void deactivateGravityPower ()
    {
        //check that the vehicle was searching a new surface, or that the gravity is different than vector3.up
        if (searchingSurface || searchingNewSurfaceBelow || searchAround || currentNormal != regularGravity) {
            conservateSpeed = true;

            gravityCenterCollider.enabled = false;

            accelerating = false;

            circumnavigableSurfaceFound = false;

            removeParent ();

            searchingNewSurfaceBelow = false;

            searchingSurface = false;

            searchAround = false;

            recalculatingSurface = false;

            powerActivated = false;

            //if the current normal before reset the gravity to the regular one is different from vectore.up, then rotate the vehicle back to the regular state
            if (currentNormal != regularGravity) {
                if (rotateVehicleCoroutine != null) {
                    StopCoroutine (rotateVehicleCoroutine);
                }

                rotateVehicleCoroutine = StartCoroutine (rotateToSurface (regularGravity, 2));
            }

            gravityPowerActive = false;

            //set the normal in the vehicle controller
            if (mainVehicleControllerLocated) {
                mainVehicleController.setNormal (regularGravity);
            }

            //disable the gravity control in the vehicle controller
            vehicleCameraManager.usingBoost (false, "stopShake", true, true);

            if (mainVehicleControllerLocated) {
                mainVehicleController.changeGravityControlUse (false);
            }
        }
    }

    //the player is getting on or off from the vehicle, so enable or disable the graivty control component
    public void changeGravityControlState (bool state)
    {
        gravityControlEnabled = state;

        //if the vehicle is not being driving, and it wasn't in the ground, deactivate the gravity control
        if (!gravityControlEnabled && !OnGround) {
            deactivateGravityPower ();

            accelerating = false;
        }
    }

    //rotate the vehicle and its camera to the new found surface, using the normal of that surface
    public IEnumerator rotateToSurface (Vector3 normal, int rotSpeed)
    {
        previousVelocity = mainRigidbody.linearVelocity;

        //the vehicle is being rotate, so set its velocity to 0
        rotating = true;

        currentNormal = normal;

        //set the new normal in the vehicle controller
        if (mainVehicleControllerLocated) {
            mainVehicleController.setNormal (currentNormal);
        }

        //get the current rotation of the vehicle and the camera
        Quaternion currentVehicleRotation = transform.rotation;
        Quaternion currentVehicleCameraRotation = vehicleCamera.rotation;

        Vector3 currentVehicleForward = Vector3.Cross (transform.right, normal);
        Quaternion targetVehicleRotation = Quaternion.LookRotation (currentVehicleForward, normal);
        Vector3 currentVehicleCameraForward = Vector3.Cross (vehicleCamera.right, normal);
        Quaternion targetVehicleCameraRotation = Quaternion.LookRotation (currentVehicleCameraForward, normal);

        //rotate from their rotation to thew new surface normal direction
        for (float t = 0; t < 1;) {
            t += Time.deltaTime * rotSpeed;

            vehicleCamera.rotation = Quaternion.Slerp (currentVehicleCameraRotation, targetVehicleCameraRotation, t);
            transform.rotation = Quaternion.Slerp (currentVehicleRotation, targetVehicleRotation, t);

            yield return null;
        }

        rotating = false;

        //store the current vehicle velocity to set it again once the rotation is finished, is only applied when the gravity control is disabled
        if (conservateSpeed) {
            mainRigidbody.linearVelocity = previousVelocity;
        }

        conservateSpeed = false;
    }

    public void setUseCenterPointActiveState (bool state, Transform newCenterPoint)
    {
        useCenterPointActive = state;

        currentCenterPoint = newCenterPoint;
    }

    public void rotateVehicleToRaycastDirection (Vector3 raycastDirection)
    {
        if (rotating) {
            return;
        }

        print ("ROTATE");

        if (lastTimeRotateVehicleToRaycastDirection != 0) {
            if (Time.time < lastTimeRotateVehicleToRaycastDirection + 0.5f) {
                return;
            }
        }

        lastTimeRotateVehicleToRaycastDirection = Time.time;

        pos = settings.centerOfMass.position;
        dir = raycastDirection;

        //if the raycast found a new surface, then
        if (Physics.Raycast (pos, dir, out hit, Mathf.Infinity, settings.layer)) {
            //check is not a trigger or a rigidbody
            if (!hit.collider.isTrigger && hit.rigidbody == null) {
                //a new valid surface has been detected, so stop the search of a new surface

                searchingNewSurfaceBelow = false;
                searchingSurface = false;
                searchAround = false;
                powerActivated = false;

                addPreviousVelocityMagnitude = true;

                if (mainRigidbody.linearVelocity.magnitude != 0) {
                    previousVelocityMagnitude = mainRigidbody.linearVelocity.magnitude;
                }

                //set to 0 the vehicle velocity
                mainRigidbody.linearVelocity = Vector3.zero;

                //disable the collider in the center of mass
                gravityCenterCollider.enabled = false;

                //if the surface can be circumnavigate
                if (hit.collider.gameObject.CompareTag (settings.tagForCircumnavigate)) {
                    circumnavigableSurfaceFound = true;
                }

                //if the surface is moving
                if (hit.collider.gameObject.CompareTag (settings.tagForMovingObjects)) {
                    addParent (hit.collider.gameObject);
                }

                //if the new normal is different from the current normal, which means that is other surface inclination, then 
                if (hit.normal != currentNormal) {
                    //rotate the vehicle according to that normal
                    if (rotateVehicleCoroutine != null) {
                        StopCoroutine (rotateVehicleCoroutine);
                    }

                    rotateVehicleCoroutine = StartCoroutine (rotateToSurface (hit.normal, 2));
                }

                //disable the gravity control in the vehicle controller
                if (mainVehicleControllerLocated) {
                    mainVehicleController.changeGravityControlUse (false);
                }

                vehicleCameraManager.usingBoost (false, "StopShake", true, true);

                if (rotateVehicleCoroutine != null) {
                    StopCoroutine (rotateVehicleCoroutine);
                }

                rotateVehicleCoroutine = StartCoroutine (rotateVehicleToLandSurfaceCoroutine (hit.normal));
            }
        }
    }

    public void rotateVehicleToLandSurface (Vector3 hitNormal)
    {
        if (rotating && hitNormal == currentNormal) {
            return;
        }

        if (rotateVehicleCoroutine != null) {
            StopCoroutine (rotateVehicleCoroutine);
        }

        rotateVehicleCoroutine = StartCoroutine (rotateVehicleToLandSurfaceCoroutine (hitNormal));
    }

    public IEnumerator rotateVehicleToLandSurfaceCoroutine (Vector3 hitNormal)
    {
        rotating = true;

        currentNormal = hitNormal;

        //set the new normal in the vehicle controller
        if (mainVehicleControllerLocated) {
            mainVehicleController.setNormal (currentNormal);
        }

        //get the current rotation of the vehicle and the camera
        Quaternion currentVehicleRotation = transform.rotation;
        Quaternion currentVehicleCameraRotation = vehicleCamera.rotation;
        Vector3 currentVehicleForward = Vector3.Cross (transform.right, hitNormal);
        Quaternion targetVehicleRotation = Quaternion.LookRotation (currentVehicleForward, hitNormal);
        Vector3 currentVehicleCameraForward = Vector3.Cross (vehicleCamera.right, hitNormal);
        Quaternion targetVehicleCameraRotation = Quaternion.LookRotation (currentVehicleCameraForward, hitNormal);

        //rotate from their rotation to thew new surface normal direction
        for (float t = 0; t < 1;) {
            t += Time.deltaTime * 2;

            vehicleCamera.rotation = Quaternion.Slerp (currentVehicleCameraRotation, targetVehicleCameraRotation, t);
            transform.rotation = Quaternion.Slerp (currentVehicleRotation, targetVehicleRotation, t);

            yield return null;
        }

        rotating = false;

        pauseDownForce (false);

        if (addPreviousVelocityMagnitude) {
            mainRigidbody.linearVelocity += previousVelocityMagnitude * (-currentNormal);

            addPreviousVelocityMagnitude = false;
        }
    }

    //get the current camera pivot, according to the vehicle view, in fisrt or third person
    public void getCurrentCameraPivot (Transform newPivot)
    {
        pivot = newPivot;
    }

    public void pauseDownForce (bool state)
    {
        useGravity = !state;
    }

    public void setCustomNormal (Vector3 normal)
    {
        Quaternion currentVehicleRotation = transform.rotation;
        Quaternion currentVehicleCameraRotation = vehicleCamera.rotation;
        Vector3 currentVehicleForward = Vector3.Cross (transform.right, normal);
        Quaternion targetVehicleRotation = Quaternion.LookRotation (currentVehicleForward, normal);
        Vector3 currentVehicleCameraForward = Vector3.Cross (vehicleCamera.right, normal);
        Quaternion targetVehicleCameraRotation = Quaternion.LookRotation (currentVehicleCameraForward, normal);

        transform.rotation = targetVehicleRotation;
        vehicleCamera.rotation = targetVehicleCameraRotation;
        currentNormal = normal;
    }

    public override Vector3 getCurrentNormal ()
    {
        return currentNormal;
    }

    public float getGravityForce ()
    {
        return gravityForce;
    }

    public void setNewGravityForce (float newValue)
    {
        gravityForce = newValue;
    }

    public void setOriginalGravityForce ()
    {
        setNewGravityForce (originalGravityForce);
    }

    public override bool isUsingRegularGravity ()
    {
        return currentNormal == regularGravity;
    }

    public Vector3 getRegularGravity ()
    {
        return regularGravity;
    }

    public void updateCurrentNormalExternally (Vector3 newValue)
    {
        currentNormal = newValue;
    }

    public bool changeDriverGravityWhenGetsOffActive ()
    {
        return changeDriverGravityWhenGetsOff;
    }

    public bool isSetVehicleRegularGravityOnDriverGetOffActive ()
    {
        return setVehicleRegularGravityOnDriverGetOff;
    }

    public void setGravityForcePausedState (bool state)
    {
        gravityForcePaused = state;
    }

    public bool isGravityPowerActive ()
    {
        return gravityPowerActive;
    }

    public bool isGravityControlEnabled ()
    {
        return gravityControlEnabled;
    }

    //CALL INPUT FUNCTIONS
    public void inputEnableOrDisableGravityControl (bool enableGravityControl)
    {
        if (HUDManager.vehicleIsDestroyed ()) {
            return;
        }

        if (!mainVehicleController.isPlayerMovingOn3dWorld ()) {
            return;
        }

        //if the vehicle is being driving
        if (gravityControlEnabled && settings.canUseGravityControl) {
            //activate the gravity control to search a new surface in the camera direction
            if (enableGravityControl) {
                activateGravityPower (pivot.TransformDirection (Vector3.forward), pivot.TransformDirection (Vector3.right));
            } else {
                //deactivate the gravity control
                deactivateGravityPower ();
            }
        }
    }

    public void inputIncreasOrDecreaseGravitySpeed (bool increaseGravitySpeed)
    {
        if (HUDManager.vehicleIsDestroyed ()) {
            return;
        }

        if (gravityControlEnabled && settings.canUseGravityControl) {
            if (searchingSurface || searchingNewSurfaceBelow || gravityPowerActive) {
                //if the vehicle is searching a new surface, increase its velocity, only when the gravity power is active
                if (increaseGravitySpeed) {
                    accelerating = true;

                    vehicleCameraManager.usingBoost (true, "Quick Gravity Control", true, true);
                } else {
                    //stop to increase the velocity of the vehiclee in the air
                    accelerating = false;

                    vehicleCameraManager.usingBoost (true, "Regular Gravity Control", true, true);
                }
            }
        }
    }

    public void setCheckDownSpeedActiveState (bool state)
    {
        checkDownSpeedActive = state;
    }

#if UNITY_EDITOR
    //draw the ray distance radius in the vehicle
    void OnDrawGizmosSelected ()
    {
        if (showGizmo) {
            if (settings.centerOfMass != null) {
                Gizmos.color = Color.yellow;
                Gizmos.DrawWireSphere (settings.centerOfMass.position, settings.vehicleRadius);

                Gizmos.color = Color.cyan;
                Gizmos.DrawLine (settings.centerOfMass.position, settings.centerOfMass.position - settings.rayDistance * settings.centerOfMass.up);
            }
        }
    }
#endif

    [System.Serializable]
    public class otherSettings
    {
        public LayerMask layer;
        public float speed = 10;
        public float accelerateSpeed = 20;
        public float velocityToSearch = 10;
        public float gravityMultiplier = 1;
        public float rayDistance;
        public float vehicleRadius;
        public Transform centerOfMass;
        public bool canUseGravityControl;
        public float massDivider = 1000;
        public string tagForCircumnavigate = "sphere";
        public string tagForMovingObjects = "moving";
    }
}