/**
 * Runtime apiVector3 for updating instance objects
 * @param implementation GameLib.D3.Graphics
 * @param apiVector3 GameLib.API.Vector3
 * @param parentObject GameLib.*
 * @param grain Number
 * @constructor
 */
GameLib.Vector3 = function (
    implementation,
    apiVector3,
    parentObject,
    grain
) {

    this.implementation = implementation;

    if (implementation instanceof GameLib.D3.Graphics) {
        this.physics = null;
        this.graphics = implementation;
		this.graphics.isNotThreeThrow();
    } else if (implementation instanceof GameLib.D3.Physics) {
        this.graphics = null;
        this.physics = implementation;
        this.physics.isNotCannonThrow();
    } else {
        throw new Error('Unhandled implementation : ' + implementation);
    }

    if (GameLib.Utils.UndefinedOrNull(apiVector3)) {
        apiVector3 = {};
    }

	if (apiVector3 instanceof GameLib.Vector3) {
		return apiVector3;
	}

    GameLib.API.Vector3.call(
        this,
        apiVector3.x,
        apiVector3.y,
        apiVector3.z
    );

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

    if (GameLib.Utils.UndefinedOrNull(grain)) {
        grain = 0.001;
    }
    this.grain = grain;

    this.instance = this.createInstance();
};

GameLib.Vector3.prototype = Object.create(GameLib.API.Vector3.prototype);
GameLib.Vector3.prototype.constructor = GameLib.Vector3;

/**
 * Creates an instance vector3
 * @returns {*}
 */
GameLib.Vector3.prototype.createInstance = function() {

    var instance = null;

    if (this.graphics) {
		instance = new THREE.Vector3(
			this.x,
			this.y,
			this.z
		);
    } else if (this.physics) {
        instance = new CANNON.Vec3(
            this.x,
            this.y,
            this.z
        )
    }

    return instance;
};

/**
 * Updates the instance vector, calls updateInstance on the parent object
 */
GameLib.Vector3.prototype.updateInstance = function() {

    this.instance.x = this.x;
    this.instance.y = this.y;
    this.instance.z = this.z;

    if (this.parentObject &&
        this.parentObject !== this &&
        this.parentObject.updateInstance) {
        this.parentObject.updateInstance();
    }
};

/**
 * Converts runtime vector to API Vector
 */
GameLib.Vector3.prototype.toApiObject = function() {
    return new GameLib.API.Vector3(
        this.x,
        this.y,
        this.z
    );
};

/**
 * Creates a new copy of this Vector3
 */
GameLib.Vector3.prototype.copy = function() {
    return new GameLib.Vector3(
        this.implementation,
        new GameLib.API.Vector3(
            this.x,
            this.y,
            this.z
        ),
        this.parentObject,
        this.grain
    )
};

GameLib.Vector3.prototype.setFrom = function(vector3) {
    this.x = vector3.x;
    this.y = vector3.y;
    this.z = vector3.z;
};