/**
 * Creates a Particle object
 * @param graphics GameLib.GraphicsRuntime
 * @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 = {};
    }

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

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

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

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

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

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

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

};

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

GameLib.D3.Particle.OPACITY_TYPE_CONSTANT             = 0x1;
GameLib.D3.Particle.OPACITY_TYPE_DECREASE_LINEAR      = 0x2;
GameLib.D3.Particle.OPACITY_TYPE_INCREASE_LINEAR      = 0x3;

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_RANDOM_NORMALIZED  = 0x3;
GameLib.D3.Particle.DIRECTION_TYPE_FUNCTION           = 0x4;

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_RANDOM_X_EQUALS_Y      = 0x6;
GameLib.D3.Particle.SCALE_TYPE_FUNCTION               = 0x7;

GameLib.D3.Particle.SPEED_TYPE_CONSTANT               = 0x1;
GameLib.D3.Particle.SPEED_TYPE_LINEAR                 = 0x2;
GameLib.D3.Particle.SPEED_TYPE_EXPONENTIAL            = 0x3;
GameLib.D3.Particle.SPEED_TYPE_LOGARITHMIC            = 0x4;
GameLib.D3.Particle.SPEED_TYPE_ONE_OVER_LOG           = 0x5;
GameLib.D3.Particle.SPEED_TYPE_EXP                    = 0x6;
GameLib.D3.Particle.SPEED_TYPE_ONE_OVER_EXP           = 0x7;

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) {

    if (property === 'positionOffset') {
        this.positionOffset.instance.x = this.positionOffset.x;
        this.positionOffset.instance.y = this.positionOffset.y;
        this.positionOffset.instance.z = this.positionOffset.z;
    }

    if (property === 'direction') {
        this.direction.instance.x = this.direction.x;
        this.direction.instance.y = this.direction.y;
        this.direction.instance.z = this.direction.z;
    }

    if (property === 'scale') {
        this.scale.instance.x = this.scale.x;
        this.scale.instance.y = this.scale.y;
        this.scale.instance.z = this.scale.z;
    }

    if (property === 'rotation') {
        this.rotation.instance.x = this.rotation.x;
        this.rotation.instance.y = this.rotation.y;
        this.rotation.instance.z = this.rotation.z;
    }

};


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

    this.updateInstance('positionOffset');
    this.updateInstance('direction');
    this.updateInstance('scale');
    this.updateInstance('rotation');

    var clone = GameLib.Component.prototype.cloneInstance.call(this);

    clone.position = this.parentParticleEngine.position.instance.clone();

    clone.material = this.mesh.materials[0].instance.clone();

    clone.visible = true;

    if (this.positionOffsetType === GameLib.D3.Particle.POSITION_OFFSET_TYPE_CONSTANT) {
        clone.position.add(this.positionOffset.instance);
    }

    var addX = 1;
    var addY = 1;
    var addZ = 1;

    if (this.positionOffsetType === GameLib.D3.Particle.POSITION_OFFSET_TYPE_RANDOM) {

        addX = GameLib.Utils.GetRandomIntInclusive(1,2);
        addY = GameLib.Utils.GetRandomIntInclusive(1,2);
        addZ = GameLib.Utils.GetRandomIntInclusive(1,2);

        if (addX === 1) {
            clone.position.x += Math.random() * this.positionOffset.x;
        } else {
            clone.position.x -= Math.random() * this.positionOffset.x;
        }

        if (addY === 1) {
            clone.position.y -= Math.random() * this.positionOffset.y;
        } else {
            clone.position.y += Math.random() * this.positionOffset.y;
        }

        if (addZ === 1) {
            clone.position.z -= Math.random() * this.positionOffset.z;
        } else {
            clone.position.z += Math.random() * this.positionOffset.z;
        }
    }

    clone.userData.direction = this.direction.clone();

    if (this.directionType === GameLib.D3.Particle.DIRECTION_TYPE_CONSTANT) {

        /**
         * Nothing to do
         */

    } else if (
        this.directionType === GameLib.D3.Particle.DIRECTION_TYPE_RANDOM ||
        this.directionType === GameLib.D3.Particle.DIRECTION_TYPE_RANDOM_NORMALIZED
    ) {

        addX = GameLib.Utils.GetRandomIntInclusive(1,2);
        addY = GameLib.Utils.GetRandomIntInclusive(1,2);
        addZ = GameLib.Utils.GetRandomIntInclusive(1,2);

        clone.userData.direction.x = 0;
        clone.userData.direction.y = 0;
        clone.userData.direction.z = 0;

        if (addX === 1) {
            clone.userData.direction.x += Math.random() * this.direction.x;
        } else {
            clone.userData.direction.x -= Math.random() * this.direction.x;
        }

        if (addY === 1) {
            clone.userData.direction.y -= Math.random() * this.direction.y;
        } else {
            clone.userData.direction.y += Math.random() * this.direction.y;
        }

        if (addZ === 1) {
            clone.userData.direction.z -= Math.random() * this.direction.z;
        } else {
            clone.userData.direction.z += Math.random() * this.direction.z;
        }

        if (this.directionType === GameLib.D3.Particle.DIRECTION_TYPE_RANDOM_NORMALIZED) {
            clone.userData.direction.normalize();
        }

    } else {
        throw new Error('not yet implemented')
    }


    if (this.scaleType === GameLib.D3.Particle.SCALE_TYPE_CONSTANT) {
        clone.scale.x += this.scale.x;
        clone.scale.y += this.scale.y;
        clone.scale.z += this.scale.z;
    }

    if (this.scaleType === GameLib.D3.Particle.SCALE_TYPE_RANDOM) {

        add = GameLib.Utils.GetRandomIntInclusive(1,2);

        if (add === 1) {
            clone.scale.x += Math.random() * this.scale.x;
            clone.scale.y += Math.random() * this.scale.y;
            clone.scale.z += Math.random() * this.scale.z;
        } else {
            clone.scale.x -= Math.random() * this.scale.x;
            clone.scale.y -= Math.random() * this.scale.y;
            clone.scale.z -= Math.random() * this.scale.z;
        }
    }

    if (this.scaleType === GameLib.D3.Particle.SCALE_TYPE_RANDOM_X_EQUALS_Y) {

        add = GameLib.Utils.GetRandomIntInclusive(1,2);

        var factor = Math.random() * this.scale.x;

        if (add === 1) {
            clone.scale.x += factor;
            clone.scale.y += factor;
            clone.scale.z += Math.random() * this.scale.z;
        } else {
            clone.scale.x -= factor;
            clone.scale.y -= factor;
            clone.scale.z -= Math.random() * this.scale.z;
        }
    }


    clone.userData.scale        = this.scale.clone();
    clone.userData.lifeTime     = this.lifeTime;
    clone.userData.speedType    = this.speedType;
    clone.userData.speed        = this.speed;
    clone.userData.scene        = this.mesh.parentScene.instance;

    clone.userData.elapsed = 0;

    clone.userData.scene.add(clone);
    
    return clone;
};

/**
 * 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.opacityType,
        this.opacityFactor,
        this.positionOffsetType,
        this.positionOffset.toApiObject(),
        this.positionOffsetFn,
        this.directionType,
        this.direction.toApiObject(),
        this.directionFn,
        this.speedType,
        this.speed,
        this.scaleType,
        this.scale.toApiObject(),
        this.scaleFn,
        this.rotationType,
        this.rotation.toApiObject(),
        this.rotationFn,
        GameLib.Utils.IdOrNull(this.parentParticleEngine),
        GameLib.Utils.IdOrNull(this.parentEntity)
    );

};

/**
 * Converts from an Object Particle to a GameLib.D3.Particle
 * @param graphics GameLib.GraphicsRuntime
 * @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
    );

};