import ForEach from './ForEach.js'
import defined from '../../Core/defined.js'

    /**
     * Iterate through the objects within the glTF and delete their pipeline extras object.
     *
     * @param {Object} gltf A javascript object containing a glTF asset.
     * @returns {Object} glTF with no pipeline extras.
     *
     * @private
     */
    function removePipelineExtras(gltf) {
        ForEach.shader(gltf, function(shader) {
            removeExtras(shader);
        });
        ForEach.buffer(gltf, function(buffer) {
            removeExtras(buffer);
        });
        ForEach.image(gltf, function (image) {
            removeExtras(image);
            ForEach.compressedImage(image, function(compressedImage) {
                removeExtras(compressedImage);
            });
        });

        removeExtras(gltf);

        return gltf;
    }

    function removeExtras(object) {
        if (!defined(object.extras)) {
            return;
        }

        if (defined(object.extras._pipeline)) {
            delete object.extras._pipeline;
        }

        if (Object.keys(object.extras).length === 0) {
            delete object.extras;
        }
    }

    export default removePipelineExtras;