import { SingleProc, getRandomId } from '@v1nt1248/3nclient-lib/utils';
import type { FileLinkStoreService } from '~/index';

export async function outgoingFileLinkStore(): Promise<FileLinkStoreService> {
  const fileProc = new SingleProc();
  let fs: web3n.files.WritableFS | undefined;

  const initializing = async (): Promise<void> => {
    fs = await w3n.storage?.getAppLocalFS();
  };

  const checkFs = async (): Promise<void> => {
    if (!fs) {
      await initializing();
    }
  };

  const saveLink = async (file: web3n.files.ReadonlyFile): Promise<string> => {
    const fileId = getRandomId(20);

    try {
      await checkFs();
      await fileProc.startOrChain(() => fs!.link(fileId, file));
    } catch (e) {
      console.error(`Error saving link to ${file.name}. `, e);
    }

    return fileId;
  };

  const getLink = async (fileId: string): Promise<web3n.files.SymLink | null | undefined> => {
    try {
      await checkFs();
      return await fileProc.startOrChain(() => fs!.readLink(fileId));
    } catch (e) {
      console.error(`Error getting link ${fileId}. `, e);
      const { notFound, path } = e as web3n.files.FileException;
      if (path === fileId && notFound) {
        return null;
      }
    }
  };

  const getFile = async (fileId: string): Promise<web3n.files.Linkable | null | undefined> => {
    try {
      const link = await getLink(fileId);
      if (link && link.isFile) {
        return await link.target();
      }
      return null;
    } catch (e) {
      console.error(`Error getting file ${fileId}. `, e);
    }
  };

  const deleteLink = async (fileId: string): Promise<void> => {
    try {
      await checkFs();
      await fileProc.startOrChain(() => fs!.deleteLink(fileId));
    } catch (e) {
      console.error(`Error deleting link ${fileId}. `, e);
    }
  };

  await initializing();

  return {
    saveLink,
    getLink,
    getFile,
    deleteLink,
  };
}
