import { Graph } from "graphlib";
import * as util from "./util";
import lodash from "lodash";

/* istanbul ignore next */
export function debugOrdering(g: Graph) {
  const layerMatrix = util.buildLayerMatrix(g);

  const h = new Graph({ compound: true, multigraph: true }).setGraph({});

  g.nodes().forEach((v) => {
    h.setNode(v, { label: v });
    h.setParent(v, "layer" + g.node(v).rank);
  });

  g.edges().forEach((e) => {
    h.setEdge(e.v, e.w, {}, e.name);
  });

  layerMatrix.forEach((layer: string[], i: number) => {
    const layerV = "layer" + i;
    h.setNode(layerV, { rank: "same" });
    lodash.reduce(layer, function (u: any, v: any) {
      h.setEdge(u, v, { style: "invis" });
      return v;
    });
  });

  return h;
}