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

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

    if (GameLib.Utils.UndefinedOrNull(apiPathFollowing)) {
        apiPathFollowing = {};
    }

	if (apiPathFollowing instanceof GameLib.D3.PathFollowing) {
		return apiPathFollowing;
	}

    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.baseOffset,
        this
    );

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

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

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

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

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

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

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

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

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

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

    GameLib.Component.call(
        this,
        GameLib.Component.COMPONENT_PATH_FOLLOWING,
        {
            'spline': GameLib.D3.Spline,
            'mesh' : GameLib.D3.Mesh,
            'raytraceMesh' : GameLib.D3.Mesh
        }
    );
};

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

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

	console.log('GameLib.D3.PathFollowing.prototype.createInstance()');

    GameLib.Component.prototype.createInstance.call(this);

};

GameLib.D3.PathFollowing.prototype.toApiObject = 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.toApiObject(),
        this.maxOffset.toApiObject(),
        this.steeringSpeed,
        this.targetOffset.toApiObject(),
        this.currentOffset.toApiObject(),
        this.currentPathValue,
        this.currentSpeed,
        this.direction,
        this.raycaster.toApiObject(),
        this.currentPosition.toApiObject(),
        this.futurePosition.toApiObject(),
        this.up.toApiObject(),
        this.rotationMatrix.toApiObject(),
        this.rotationVector.toApiObject(),
        GameLib.Utils.IdOrNull(this.parentEntity)
    );

    return apiPathFollowing;
};

/**
 * Object path following to GameLib.D3.PathFollowing
 * @param graphics
 * @param objectComponent
 * @returns {GameLib.D3.PathFollowing}
 * @constructor
 */
GameLib.D3.PathFollowing.FromObject = function(graphics, objectComponent) {

    var apiPathFollowing = GameLib.D3.API.PathFollowing.FromObject(objectComponent);

    return new GameLib.D3.PathFollowing(
        graphics,
        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.currentPosition
        );

        this.raycaster.setDirection(
            {
                x : -this.up.x,
                y : -this.up.y,
                z : -this.up.z
            }
        );

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

        this.rotationVector.setFromRotationMatrix(this.rotationMatrix);

        this.mesh.position.x = this.futurePosition.x;
        this.mesh.position.y = this.futurePosition.y;
        this.mesh.position.z = this.futurePosition.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;
    }
};