/**
 * Creates a Particle object
 * @param graphics GameLib.D3.Graphics
 * @param apiParticle GameLib.D3.API.Particle
 * @constructor
 */
GameLib.D3.Particle = function(
    graphics,
    apiParticle
) {

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

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

    if (apiParticle instanceof GameLib.D3.Particle) {
        return apiParticle;
    }

    GameLib.D3.API.Particle.call(
        this,
        apiParticle.id,
        apiParticle.name,
        apiParticle.lifeTime,
        apiParticle.elapsed,
        apiParticle.mesh,
        apiParticle.positionOffsetType,
        apiParticle.positionOffset,
        apiParticle.positionOffsetFn,
        apiParticle.directionType,
        apiParticle.direction,
        apiParticle.directionFn,
        apiParticle.speed,
        apiParticle.scaleType,
        apiParticle.scale,
        apiParticle.scaleFn,
        apiParticle.rotationType,
        apiParticle.rotation,
        apiParticle.rotationFn,
        apiParticle.parentEngine,
        apiParticle.parentEntity
    );

    if (this.mesh instanceof GameLib.D3.API.Mesh) {
        this.mesh = new GameLib.D3.Mesh(
            graphics,
            this.mesh
        )
    }

    if (this.positionOffset instanceof GameLib.API.Vector3) {
        this.positionOffset = new GameLib.Vector3(
            graphics,
            this.positionOffset,
            this
        );
    } else {
        console.warn('positionOffset not instance of API.Vector3');
        throw new Error('positionOffset not instance of API.Vector3');
    }

    if (this.direction instanceof GameLib.API.Vector3) {
        this.direction = new GameLib.Vector3(
            graphics,
            this.direction,
            this
        );
    } else {
        console.warn('direction not instance of API.Vector3');
        throw new Error('direction not instance of API.Vector3');
    }

    if (this.scale instanceof GameLib.API.Vector3) {
        this.scale = new GameLib.Vector3(
            graphics,
            this.scale,
            this
        );
    } else {
        console.warn('scale not instance of API.Vector3');
        throw new Error('scale not instance of API.Vector3');
    }

    if (this.rotation instanceof GameLib.API.Vector3) {
        this.rotation = new GameLib.Vector3(
            graphics,
            this.rotation,
            this
        );
    } else {
        console.warn('rotation not instance of API.Vector3');
        throw new Error('rotation not instance of API.Vector3');
    }

    GameLib.Component.call(
        this,
        GameLib.Component.COMPONENT_PARTICLE,
        {
            mesh : GameLib.D3.Mesh,
            parentEngine : GameLib.D3.ParticleEngine
        }
    );

};

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

GameLib.D3.Particle.POSITION_OFFSET_TYPE_CONSTANT     = 0x1;
GameLib.D3.Particle.POSITION_OFFSET_TYPE_RANDOM       = 0x2;
GameLib.D3.Particle.POSITION_OFFSET_TYPE_FUNCTION     = 0x3;

GameLib.D3.Particle.DIRECTION_TYPE_CONSTANT           = 0x1;
GameLib.D3.Particle.DIRECTION_TYPE_RANDOM             = 0x2;
GameLib.D3.Particle.DIRECTION_TYPE_FUNCTION           = 0x3;

GameLib.D3.Particle.SCALE_TYPE_CONSTANT               = 0x1;
GameLib.D3.Particle.SCALE_TYPE_LINEAR                 = 0x2;
GameLib.D3.Particle.SCALE_TYPE_EXPONENTIAL            = 0x3;
GameLib.D3.Particle.SCALE_TYPE_RANDOM                 = 0x4;
GameLib.D3.Particle.SCALE_TYPE_FUNCTION               = 0x5;

GameLib.D3.Particle.ROTATION_TYPE_CONSTANT            = 0x1;
GameLib.D3.Particle.ROTATION_TYPE_RANDOM              = 0x2;
GameLib.D3.Particle.ROTATION_TYPE_FUNCTION            = 0x3;

/**
 * Particle create instance
 */
GameLib.D3.Particle.prototype.createInstance = function() {

    if (!this.mesh) {
        console.warn('no mesh to clone from - failed dependency check?');
        return
    }

    this.instance = this.mesh.instance;

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

/**
 * Updates the instance with the current state
 */
GameLib.D3.Particle.prototype.updateInstance = function(property) {
    console.log('Update Particle Property : ' + property);
};


/**
 * Clones a particle - this only clones 3rd party instances, so we have less overhead of creating these types of objects
 */
GameLib.D3.Particle.prototype.clone = function(camera) {

    var position = camera.instance.position.clone();
    var lookAt = camera.lookAt.instance.clone();

    var direction = lookAt.sub(position).negate();

    this.instance.visible = false;

    var instance = this.instance.clone();
    instance.visible = true;

    instance.lookAt(direction);

    instance.userData.direction = this.direction.instance.clone();
    instance.userData.elapsed = 0;
    instance.userData.lifeTime = this.lifeTime;
    this.mesh.parentScene.instance.add(instance);
    return instance;
};

/**
 * Converts a GameLib.D3.Particle to a new GameLib.D3.API.Particle
 * @returns {GameLib.D3.API.Particle}
 */
GameLib.D3.Particle.prototype.toApiObject = function() {

    return new GameLib.D3.API.Particle(
        this.id,
        this.name,
        this.lifeTime,
        this.elapsed,
        GameLib.Utils.IdOrNull(this.mesh),
        this.positionOffsetType,
        this.positionOffset.toApiObject(),
        this.positionOffsetFn,
        this.directionType,
        this.direction.toApiObject(),
        this.directionFn,
        this.speed,
        this.scaleType,
        this.scale.toApiObject(),
        this.scaleFn,
        this.rotationType,
        this.rotation.toApiObject(),
        this.rotationFn,
        GameLib.Utils.IdOrNull(this.parentEngine),
        GameLib.Utils.IdOrNull(this.parentEntity)
    );

};

/**
 * Converts from an Object Particle to a GameLib.D3.Particle
 * @param graphics GameLib.D3.Graphics
 * @param objectParticle Object
 * @returns {GameLib.D3.Particle}
 * @constructor
 */
GameLib.D3.Particle.FromObject = function(graphics, objectParticle) {

    var apiParticle = GameLib.D3.API.Particle.FromObject(objectParticle);

    return new GameLib.D3.Particle(
        graphics,
        apiParticle
    );

};