/**
 * GameLib.D3.Camera
 * @param graphics GameLib.GraphicsRuntime
 * @param apiCamera GameLib.D3.API.Camera
 * @constructor
 */
GameLib.D3.Camera = function(
    graphics,
    apiCamera
) {

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

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

    GameLib.D3.API.Camera.call(
        this,
        apiCamera.id,
        apiCamera.name,
        apiCamera.cameraType,
        apiCamera.aspect,
        apiCamera.position,
        apiCamera.rotation,
        apiCamera.quaternion,
        apiCamera.lookAt,
        apiCamera.parentEntity
    );

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

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

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

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

    var linkedObjects = {};

    switch (apiCamera.cameraType) {
        case GameLib.D3.API.Camera.CAMERA_TYPE_CUBE :
            linkedObjects.renderTarget = GameLib.D3.RenderTarget;
            break;
        case GameLib.D3.API.Camera.CAMERA_TYPE_STEREO :
            linkedObjects.effect = GameLib.D3.Effect;
            break;
        default :
            break;
    }

    GameLib.Component.call(
        this,
        linkedObjects
    );
};

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

/**
 * Creates a camera instance of 'graphics' type (only THREE for now)
 * @returns {THREE.Camera}
 */
GameLib.D3.Camera.prototype.createInstance = function() {

    /**
     * Not all implementations of camera has a position (Stereo camera gets its position on update)
     */
    if (GameLib.Utils.Defined(this.instance.position)) {
        this.instance.position.x = this.position.x;
        this.instance.position.y = this.position.y;
        this.instance.position.z = this.position.z;
    }

    if (GameLib.Utils.Defined(this.instance.rotation)) {
        this.instance.rotation.x = this.rotation.x;
        this.instance.rotation.y = this.rotation.y;
        this.instance.rotation.z = this.rotation.z;
    }

    if (GameLib.Utils.Defined(this.instance.quaternion)) {
        this.instance.quaternion.x = this.quaternion.x;
        this.instance.quaternion.y = this.quaternion.y;
        this.instance.quaternion.z = this.quaternion.z;
        this.instance.quaternion.w = this.quaternion.w;
    }


    /**
     * Not all implementations of camera has aspect ratio, we, however do have an aspect ratio for all our cameras
     */
    if (GameLib.Utils.Defined(this.instance.aspect)) {
        this.instance.aspect = this.aspect;
    }

    /**
     * Only do lookAt for stereo and cube cameras
     */
    if (
        this.cameraType === GameLib.D3.API.Camera.CAMERA_TYPE_STEREO ||
        this.cameraType === GameLib.D3.API.Camera.CAMERA_TYPE_PERSPECTIVE
    ) {
        this.instance.lookAt(this.lookAt.instance);
    }

    if (GameLib.Utils.Defined(this.instance.updateProjectionMatrix)) {
        this.instance.updateProjectionMatrix();
    }

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

/**
 * Updates the instance with the current state
 */
GameLib.D3.Camera.prototype.updateInstance = function(property) {

    if (GameLib.Utils.UndefinedOrNull(property)) {
        console.warn('no camera property specified for : ' + this.name);
    }

    if (property === 'cameraType') {

        this.remove();

        var args = [this.graphics, {
            id : this.id,
            name : this.name
        }];

        if (this.cameraType === GameLib.D3.API.Camera.CAMERA_TYPE_STEREO) {
            GameLib.D3.Camera.Stereo.apply(this, args);
        }

        if (this.cameraType === GameLib.D3.API.Camera.CAMERA_TYPE_CUBE) {
            GameLib.D3.Camera.Cube.apply(this, args);
        }

        if (this.cameraType === GameLib.D3.API.Camera.CAMERA_TYPE_PERSPECTIVE) {
            GameLib.D3.Camera.Perspective.apply(this, args);
        }

        if (this.cameraType === GameLib.D3.API.Camera.CAMERA_TYPE_ORTHOGRAPHIC) {
            GameLib.D3.Camera.Orthographic.apply(this, args);
        }

        return;
    }

    if (property === 'aspect') {
        if (GameLib.Utils.Defined(this.instance.aspect)) {
            this.instance.aspect = this.aspect;
            if (GameLib.Utils.Defined(this.instance.updateProjectionMatrix)) {
                this.instance.updateProjectionMatrix();
            }
        } else {
            console.warn('updating the aspect ratio of this type of camera has no effect.');
        }
        return;
    }

    if (property === 'position') {

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

        if (GameLib.Utils.Defined(this.instance.updateProjectionMatrix)) {
            this.instance.updateProjectionMatrix();
        }

        return;
    }

    if (property === 'rotation') {

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

        if (GameLib.Utils.Defined(this.instance.updateProjectionMatrix)) {
            this.instance.updateProjectionMatrix();
        }

        return;
    }

    if (property === 'quaternion') {

        console.log('todo: update quaternion');

        // return;
        // if (GameLib.Utils.Defined(this.instance.updateProjectionMatrix)) {
        //     this.instance.updateProjectionMatrix();
        // }

        return;
    }

    if (property === 'lookAt') {

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

        if (GameLib.Utils.Defined(this.instance.lookAt)) {
            this.instance.lookAt(this.lookAt.instance);
        }

        if (GameLib.Utils.Defined(this.instance.updateProjectionMatrix)) {
            this.instance.updateProjectionMatrix();
        }

        return;
    }

    GameLib.Component.prototype.updateInstance.call(this, property);
};

/**
 * Resize default
 * @param width
 * @param height
 */
// GameLib.D3.Camera.prototype.resize = function(width, height) {
//     camera.aspect = width / height;
//     camera.updateInstance();
// };

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

    return new GameLib.D3.API.Camera(
        this.id,
        this.name,
        this.cameraType,
        this.aspect,
        this.position.toApiObject(),
        this.lookAt.toApiObject(),
        GameLib.Utils.IdOrNull(this.parentEntity)
    );

};

GameLib.D3.Camera.prototype.updateFromInstance = function() {

    this.aspect = this.instance.aspect;

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

    if (this.instance.target) {
        this.lookAt.x = this.instance.target.position.x;
        this.lookAt.y = this.instance.target.position.y;
        this.lookAt.z = this.instance.target.position.z;
    } else {
        console.warn('todo: update lookAt somehow...');
    }
};