import { createOpaqueId } from "../core/ids";
import { cloneInteractionLink } from "../interactions/interaction-links";

import type { EditorCommand } from "./command";

export function createDeleteInteractionLinkCommand(linkId: string): EditorCommand {
  let previousLink = null as ReturnType<typeof cloneInteractionLink> | null;

  return {
    id: createOpaqueId("command"),
    label: "Delete interaction link",
    execute(context) {
      const currentDocument = context.getDocument();
      const currentLink = currentDocument.interactionLinks[linkId];

      if (currentLink === undefined) {
        throw new Error(`Interaction link ${linkId} does not exist.`);
      }

      if (previousLink === null) {
        previousLink = cloneInteractionLink(currentLink);
      }

      const nextInteractionLinks = {
        ...currentDocument.interactionLinks
      };
      delete nextInteractionLinks[linkId];

      context.setDocument({
        ...currentDocument,
        interactionLinks: nextInteractionLinks
      });
    },
    undo(context) {
      if (previousLink === null) {
        return;
      }

      const currentDocument = context.getDocument();

      context.setDocument({
        ...currentDocument,
        interactionLinks: {
          ...currentDocument.interactionLinks,
          [previousLink.id]: cloneInteractionLink(previousLink)
        }
      });
    }
  };
}