import { s3ContentsToTree } from "../utils/s3Helper";
import _ from "lodash";

const trimPrefix = (str, prefix, to) => {
  return str.replace(prefix, to);
};
const trimSuffix = (str) => {
  return str.replace(/.md$/, "");
};

const filterLocaleContents = (contents, prefix, sortMap) => {
  return contents!
    .filter((cont) => cont.Key!.startsWith(prefix) && cont.Key !== `${prefix}index.md`)
    .map((cont) => {
      return {
        ...cont,
        Key: trimSuffix(trimPrefix(cont.Key, prefix, "")),
        link: trimSuffix(`/${cont.Key}`),
        sortKey: trimPrefix(cont.Key, prefix, ""),
      };
    })
    .sort((a, b) => sortMap?.[a.sortKey] - sortMap?.[b.sortKey]);
};

const sideBarReducer = (r, label, i, a, Content) => {
  const extra = {
    collapsed: a.length !== i + 1,
    link: Content.link,
  };
  if (a.length === i + 1) {
    extra.items = undefined;
  } else {
    extra.link = undefined;
  }
  return extra;
};
export const buildSideBar = (contents, sideBarSortMap) => {
  const rootContents = filterLocaleContents(
    contents,
    "docs/",
    sideBarSortMap["zh-CN"]
  );
  const zhHKContents = filterLocaleContents(
    contents,
    "zh-HK/docs/",
    sideBarSortMap["zh-HK"]
  );
  const enUSContents = filterLocaleContents(
    contents,
    "en-US/docs/",
    sideBarSortMap["en-US"]
  );
  const rootSideBar = s3ContentsToTree(
    rootContents,
    { label: "text", children: "items" },
    sideBarReducer
  );
  const zhHKSideBar = s3ContentsToTree(
    zhHKContents,
    { label: "text", children: "items" },
    sideBarReducer
  );
  const enUSSideBar = s3ContentsToTree(
    enUSContents,
    { label: "text", children: "items" },
    sideBarReducer
  );
  return { rootSideBar, zhHKSideBar, enUSSideBar };
};