// import * as jsonld from "jsonld";
// import { JsonLd, JsonLdArray } from 'jsonld/jsonld-spec';
import { Quad, NamedNode, DataFactory } from 'n3';
const { literal, quad, namedNode } = DataFactory;

// import {} from 'n3';
// const { rdf } = ns;
const rdf = { type: "http://www.w3.org/1999/02/22-rdf-syntax-ns#type" };

// function _emitQuad(
//     onQuad: (q: Quad) => void,
//     subjNode: NamedNode,
//     pred: string,
//     subj: any,
//     graphNode: NamedNode) {
//     let predNode: NamedNode;
//     if (pred === "@type") {
//         predNode = namedNode(rdf.type);
//     }
//     else {
//         predNode = namedNode(pred);
//     }
//     subj[pred as string].forEach(function (obj: any) {
//         const objNode = (obj['@id'] ? namedNode(obj['@id']) :
//             literal(obj['@value'],
//                 obj['@language'] || obj['@type']));
//         onQuad(quad(subjNode, predNode, objNode, graphNode));
//     });
// }

export async function eachJsonLdQuad(jsonLdObj: object, onQuad: (q: Quad) => void) {

    // const expanded = await jsonld.expand(jsonLdObj);

    // (expanded as JsonLdArray).forEach(function (g: JsonLd) {
    //     var graph = (g as { '@id': string })['@id'];
    //     var graphNode = namedNode(graph);
    //     (g as { '@graph': JsonLdArray })['@graph'].forEach(function (subj: { [predOrId: string]: any; }) {
    //         const subjNode = namedNode(subj['@id']);
    //         for (let pred in subj) {
    //             if (pred === '@id') {
    //                 continue;
    //             }
    //             _emitQuad(onQuad, subjNode, pred, subj, graphNode);
    //         }
    //     });
    // });
}