/**
 * Runtime Follow Component
 * @param graphics R3.D3.Graphics
 * @param apiFollow
 * @constructor
 */
R3.D3.Follow = function (
    graphics,
    apiFollow
) {
    this.graphics = graphics;
    this.graphics.isNotThreeThrow();

    if (R3.Utils.UndefinedOrNull(apiFollow)) {
        apiFollow = {};
    }

	if (apiFollow instanceof R3.D3.Follow) {
		return apiFollow;
	}

    R3.D3.API.Follow.call(
        this,
        apiFollow.id,
        apiFollow.name,
        apiFollow.currentComponent,
        apiFollow.targetComponent,
        apiFollow.targetPositionOffset,
        apiFollow.minDistance,
        apiFollow.moveSpeed,
        apiFollow.parentEntity
    );

    this.targetPositionOffset = new R3.Vector3(
        this.graphics,
        this.targetPositionOffset,
        this
    );

    this.target = new R3.Vector3(
        this.graphics,
        this.target,
        this
    );

    this.targetToParent = new R3.Vector3(
        this.graphics,
        this.targetToParent,
        this
    );

    this.rotatedTargetOffset = new R3.Vector3(
        this.graphics,
        this.rotatedTargetOffset,
        this
    );

    this.rotated = new R3.Quaternion(
        this.graphics,
        this.rotated,
        this
    );

    this.buildIdToObject();

};

R3.D3.Follow.prototype = Object.create(R3.D3.API.Follow.prototype);
R3.D3.Follow.prototype.constructor = R3.D3.Follow;

R3.D3.Follow.prototype.toApiObject = function() {

    var apiFollow = new R3.D3.API.Follow(
        this.id,
        this.name,
        R3.Utils.IdOrNull(this.currentComponent),
        R3.Utils.IdOrNull(this.targetComponent),
        this.targetPositionOffset.toApiObject(),
        this.minDistance,
        this.moveSpeed,
        R3.Utils.IdOrNull(this.parentEntity)
    );

    return apiFollow;
};

R3.D3.Follow.FromObject = function(graphics, objectComponent) {

    var apiFollow = R3.D3.API.Follow.FromObject(objectComponent);

    return new R3.D3.Follow(
        graphics,
        apiFollow
    );
};

/**
 * Updates the component
 * @param deltaTime
 */
R3.D3.Follow.prototype.update = function(deltaTime) {

    if (this.currentComponent && this.targetComponent) {

        this.rotated.x = this.targetComponent.quaternion.x;
        this.rotated.y = this.targetComponent.quaternion.y;
        this.rotated.z = this.targetComponent.quaternion.z;
        this.rotated.w = this.targetComponent.quaternion.w;

     //   this.rotated.updateInstance();

        this.rotatedTargetOffset.x = this.targetPositionOffset.x;
        this.rotatedTargetOffset.y = this.targetPositionOffset.y;
        this.rotatedTargetOffset.z = this.targetPositionOffset.z;

        this.rotatedTargetOffset.applyQuaternion(this.rotated);

    //    this.rotatedTargetOffset.updateInstance();

        this.target.x = this.targetComponent.position.x + this.rotatedTargetOffset.x;
        this.target.y = this.targetComponent.position.y + this.rotatedTargetOffset.y;
        this.target.z = this.targetComponent.position.z + this.rotatedTargetOffset.z;

    //    this.target.updateInstance();

        this.targetToParent.x = this.currentComponent.position.x - this.targetComponent.position.x;
        this.targetToParent.y = this.currentComponent.position.y - this.targetComponent.position.y;
        this.targetToParent.z = this.currentComponent.position.z - this.targetComponent.position.z;

        this.targetToParent.normalize();

        this.targetToParent.x *= this.minDistance;
        this.targetToParent.y *= this.minDistance;
        this.targetToParent.z *= this.minDistance;

   //     this.targetToParent.updateInstance();

        this.target.x = this.target.x + this.targetToParent.x;
        this.target.y = this.target.y + this.targetToParent.y;
        this.target.z = this.target.z + this.targetToParent.z;

    //    this.target.updateInstance();

        var t = deltaTime * this.moveSpeed;

        //t = t * t * t * (t * (6.0 * t - 15.0) + 10.0);

        var lerp = this.currentComponent.position.lerp(this.target, t);

        this.currentComponent.position.x = lerp.x;
        this.currentComponent.position.y = lerp.y;
        this.currentComponent.position.z = lerp.z;
    }

};