import {
  SerializedDiagram,
  convertToSerializedDiagram,
} from "../src/graph-explorer/index";

export function onPageLoad(callback: (container: HTMLDivElement) => void) {
  document.addEventListener("DOMContentLoaded", () => {
    const container = document.createElement("div");
    container.id = "root";
    document.body.appendChild(container);
    callback(container);
  });
}

export function tryLoadLayoutFromLocalStorage(): SerializedDiagram | undefined {
  if (window.location.hash.length > 1) {
    try {
      const key = window.location.hash.substring(1);
      const unparsedLayout = localStorage.getItem(key);
      const entry = unparsedLayout && JSON.parse(unparsedLayout);

      // backward compatibility test. If we encounder old diagram,
      // wrap it into Diagram interface, jsonld - pass through
      if (entry["@context"]) {
        return entry;
      } else {
        return convertToSerializedDiagram({
          layoutData: entry,
          linkTypeOptions: [],
        });
      }
    } catch (_e) {
      /* ignore */
    }
  }
  return undefined;
}

export function saveLayoutToLocalStorage(diagram: SerializedDiagram): string {
  const randomKey = Math.floor((1 + Math.random()) * 0x10000000000)
    .toString(16)
    .substring(1);
  localStorage.setItem(randomKey, JSON.stringify(diagram));
  return randomKey;
}