import {
  createDocument,
  Document,
  getDocument,
  getDocuments,
  transformDocument,
} from "@lib/documents.ts";
import { Root } from "https://esm.sh/remark-frontmatter@4.0.1";

export function createCrud<T>(
  { prefix, parse }: {
    prefix: string;
    parse: (doc: string, id: string) => T;
  },
) {
  function pathFromId(id: string) {
    return `${prefix}${id}.md`;
  }

  async function read(id: string) {
    const path = pathFromId(id);
    const content = await getDocument(path);

    return parse(content, id);
  }
  function create(id: string, content: string | ArrayBuffer) {
    const path = pathFromId(id);
    return createDocument(path, content);
  }

  async function update(id: string, updater: (r: Root) => Root) {
    const path = pathFromId(id);
    const content = await getDocument(path);
    const newDoc = transformDocument(content, updater);
    await createDocument(path, newDoc);
  }

  async function readAll() {
    const allDocuments = await getDocuments();
    return Promise.all(
      allDocuments.filter((d) => {
        return d.name.startsWith(prefix) &&
          d.contentType === "text/markdown" &&
          !d.name.endsWith("index.md");
      }).map((doc) => {
        const id = doc.name.replace(prefix, "").replace(/\.md$/, "");
        return read(id);
      }),
    );
  }

  return {
    read,
    readAll,
    create,
    update,
  };
}