/**
 * This component makes the parentEntity (ex. car) follow the path provided by the spline
 * @param graphics GameLib.D3.Graphics
 * @param parentObject
 * @param apiPathFollowing GameLib.D3.API.PathFollowing
 * @constructor
 */
GameLib.D3.PathFollowing = function RuntimePathFollowing(
    graphics,
    parentObject,
    apiPathFollowing
) {

    this.graphics = graphics;
    this.graphics.isNotThreeThrow();

    if (GameLib.Utils.UndefinedOrNull(parentObject)) {
        parentObject = null;
    }
    this.parentObject = parentObject;

    GameLib.D3.API.PathFollowing.call(
        this,
		apiPathFollowing.id,
		apiPathFollowing.name,
		apiPathFollowing.spline,
        apiPathFollowing.mesh,
        apiPathFollowing.raytraceMesh,
		apiPathFollowing.accelleration,
		apiPathFollowing.maxSpeed,
		apiPathFollowing.baseOffset,
		apiPathFollowing.maxOffset,
		apiPathFollowing.steeringSpeed,
		apiPathFollowing.targetOffset,
		apiPathFollowing.currentOffset,
		apiPathFollowing.currentPathValue,
		apiPathFollowing.currentSpeed,
		apiPathFollowing.direction,
		apiPathFollowing.raycaster,
		apiPathFollowing.currentPosition,
		apiPathFollowing.futurePosition,
		apiPathFollowing.up,
		apiPathFollowing.rotationMatrix,
        apiPathFollowing.rotationVector,
        apiPathFollowing.parentEntity
    );

    this.baseOffset = new GameLib.Vector3(
        this.graphics,
        this,
        this.baseOffset
    );

    this.maxOffset = new GameLib.Vector3(
        this.graphics,
        this,
        this.maxOffset
    );

    this.targetOffset = new GameLib.Vector3(
        this.graphics,
        this,
        this.targetOffset
    );

    this.currentOffset = new GameLib.Vector3(
        this.graphics,
        this,
        this.currentOffset
    );

    this.raycaster = new GameLib.D3.Raycaster(
        this.graphics,
        this,
        this.raycaster
    );

    this.currentPosition = new GameLib.Vector3(
        this.graphics,
        this,
        this.currentPosition
    );

    this.futurePosition = new GameLib.Vector3(
        this.graphics,
        this,
        this.futurePosition
    );

    this.up = new GameLib.Vector3(
        this.graphics,
        this,
        this.up
    );

    this.rotationMatrix = new GameLib.Matrix4(
        this.graphics,
        this,
        this.rotationMatrix
    );

    this.rotationVector = new GameLib.Quaternion(
        this.graphics,
        this,
        this.rotationVector
    );


    this.mx = new GameLib.Utils.MovingAverage(10);

    this.my = new GameLib.Utils.MovingAverage(10);

    this.mz = new GameLib.Utils.MovingAverage(10);

};

GameLib.D3.PathFollowing.prototype = Object.create(GameLib.D3.API.PathFollowing.prototype);
GameLib.D3.PathFollowing.prototype.constructor = GameLib.D3.PathFollowing;

GameLib.D3.PathFollowing.prototype.toApiComponent = function() {

    var apiPathFollowing = new GameLib.D3.API.PathFollowing(
        this.id,
        this.name,
        GameLib.Utils.IdOrNull(this.spline),
        GameLib.Utils.IdOrNull(this.mesh),
        GameLib.Utils.IdOrNull(this.raytraceMesh),
        this.accelleration,
        this.maxSpeed,
        this.baseOffset.toApiVector(),
        this.maxOffset.toApiVector(),
        this.steeringSpeed,
        this.targetOffset.toApiVector(),
        this.currentOffset.toApiVector(),
        this.currentPathValue,
        this.currentSpeed,
        this.direction,
        this.raycaster.toApiRaycaster(),
        this.currentPosition.toApiVector(),
        this.futurePosition.toApiVector(),
        this.up.toApiVector(),
        this.rotationMatrix.toApiMatrix(),
        this.rotationVector.toApiQuaternion(),
        GameLib.Utils.IdOrNull(this.parentEntity)
    );

    return apiPathFollowing;
};

GameLib.D3.PathFollowing.FromObjectComponent = function(graphics, objectComponent) {

    var apiPathFollowing = new GameLib.D3.API.PathFollowing(
        objectComponent.id,
        objectComponent.name,
        objectComponent.spline,
        objectComponent.mesh,
        objectComponent.raytraceMesh,
        objectComponent.accelleration,
        objectComponent.maxSpeed,
        new GameLib.API.Vector3(
            objectComponent.baseOffset.x,
            objectComponent.baseOffset.y,
            objectComponent.baseOffset.z
        ),
        new GameLib.API.Vector3(
            objectComponent.maxOffset.x,
            objectComponent.maxOffset.y,
            objectComponent.maxOffset.z
        ),
        objectComponent.steeringSpeed,
        new GameLib.API.Vector3(
            objectComponent.targetOffset.x,
            objectComponent.targetOffset.y,
            objectComponent.targetOffset.z
        ),
        new GameLib.API.Vector3(
            objectComponent.currentOffset.x,
            objectComponent.currentOffset.y,
            objectComponent.currentOffset.z
        ),
        this.currentPathValue,
        this.currentSpeed,
        this.direction,
        new GameLib.D3.API.Raycaster(
            new GameLib.API.Vector3(
                objectComponent.raycaster.position.x,
                objectComponent.raycaster.position.y,
                objectComponent.raycaster.position.z
            ),
            new GameLib.API.Vector3(
                objectComponent.raycaster.direction.x,
                objectComponent.raycaster.direction.y,
                objectComponent.raycaster.direction.z
            )
        ),
        new GameLib.API.Vector3(
            objectComponent.currentPosition.x,
            objectComponent.currentPosition.y,
            objectComponent.currentPosition.z
        ),
        new GameLib.API.Vector3(
            objectComponent.futurePosition.x,
            objectComponent.futurePosition.y,
            objectComponent.futurePosition.z
        ),
        new GameLib.API.Vector3(
            objectComponent.up.x,
            objectComponent.up.y,
            objectComponent.up.z
        ),
        //TODO : objectComponent rotationVector matrix4
        new GameLib.API.Matrix4(
            new GameLib.API.Quaternion(),
            new GameLib.API.Quaternion(),
            new GameLib.API.Quaternion(),
            new GameLib.API.Quaternion()
        ),
        new GameLib.API.Quaternion(
            objectComponent.rotationVector.x,
            objectComponent.rotationVector.y,
            objectComponent.rotationVector.z,
            objectComponent.rotationVector.w
        ),
        objectComponent.parentEntity
    );

    return new GameLib.D3.PathFollowing(
        graphics,
        this,
        apiPathFollowing
    );
};

/**
 * Updates the component
 * @param deltaTime
 */
GameLib.D3.PathFollowing.prototype.update = function(deltaTime) {

    if (this.spline && this.mesh && this.raytraceMesh) {

        this.currentSpeed += this.accelleration * deltaTime * this.direction;
        if(this.currentSpeed > this.maxSpeed) {
            this.currentSpeed = this.maxSpeed;
        }
        this.grain = (this.currentSpeed / 100.0);

        var currentPosition = this.spline.getPointAt(this.currentPathValue);

        this.currentPosition.x = currentPosition.x;
        this.currentPosition.y = currentPosition.y;
        this.currentPosition.z = currentPosition.z;

        this.currentPathValue += this.grain;

        if (this.currentPathValue >= 1) {
            this.currentPathValue = this.currentPathValue - 1;
        }

        if (this.currentPathValue < 0) {
            this.currentPathValue = 0.0;
        }

        var futurePosition = this.spline.getPointAt(this.currentPathValue);

        this.futurePosition.x = futurePosition.x;
        this.futurePosition.y = futurePosition.y;
        this.futurePosition.z = futurePosition.z;

        this.raycaster.setPosition(
            this.futurePosition
        );

        var direction = new GameLib.Vector3(
            this.graphics,
            this,
            new GameLib.API.Vector3(
                this.up.x * -1,
                this.up.y * -1,
                this.up.z * -1
            )
        );

        this.raycaster.setDirection(
            direction
        );

        var normal = this.raycaster.getFaceNormal(this.raytraceMesh);

        if (normal) {
            this.up.x = this.mx(normal.x);
            this.up.y = this.my(normal.y);
            this.up.z = this.mz(normal.z);

            this.up.updateInstance();
        }

        this.rotationMatrix.lookAt(
            this.currentPosition,
            this.futurePosition,
            this.up
        );

        this.rotationVector.setFromRotationMatrix(this.rotationMatrix);

        /**
         * Update Position
         */
        // this.mesh.position.x = this.futurePosition.x + (this.rotationMatrix.up.x * (this.mesh.height - (2 * this.rotationMatrix.up.x)) / 2);// + transformedOffset.x;
        // this.mesh.position.y = this.futurePosition.y + (this.rotationMatrix.up.y * (this.mesh.height - (2 * this.rotationMatrix.up.y)) / 2);
        // this.mesh.position.z = this.futurePosition.z + (this.rotationMatrix.up.z * (this.mesh.height - (2 * this.rotationMatrix.up.z)) / 2);// + transformedOffset.z;

        this.mesh.position.x = this.futurePosition.x;// + transformedOffset.x;
        this.mesh.position.y = this.futurePosition.y;
        this.mesh.position.z = this.futurePosition.z;// + transformedOffset.z;

        /**
         * Update Rotation
         */
        this.mesh.quaternion.x = this.rotationVector.x;
        this.mesh.quaternion.y = this.rotationVector.y;
        this.mesh.quaternion.z = this.rotationVector.z;
        this.mesh.quaternion.w = this.rotationVector.w;
    }
};