tok-to-insta-follower-bridge/src/lib/bskyHelpers.ts

import type { ProfileView } from "@atproto/api/dist/client/types/app/bsky/actor/defs"
import { BSKY_USER_MATCH_TYPE } from "./constants"

type Names = {
  accountName: string,
  accountNameRemoveUnderscore: string,
  displayName: string,
}

export const isSimilarUser = (names: Names, bskyProfile: ProfileView | undefined): {
  isSimilar: boolean,
  type: typeof BSKY_USER_MATCH_TYPE[keyof typeof BSKY_USER_MATCH_TYPE],
} => {
  if (!bskyProfile) {
    return {
      isSimilar: false,
      type: BSKY_USER_MATCH_TYPE.NONE,
    }
  }

  const lowerCaseNames = Object.entries(names).reduce<Names>((acc, [key, value]) => {
    acc[key] = value.toLowerCase();
    return acc;
  }, {} as Names);

  const bskyHandle = bskyProfile.handle.toLocaleLowerCase().replace("@", "").split('.')[0];

  if (lowerCaseNames.accountName === bskyHandle || lowerCaseNames.accountNameRemoveUnderscore === bskyHandle) {
    return {
      isSimilar: true,
      type: BSKY_USER_MATCH_TYPE.HANDLE,
    }
  }

  if (lowerCaseNames.displayName === bskyProfile.displayName?.toLocaleLowerCase()) {
    return {
      isSimilar: true,
      type: BSKY_USER_MATCH_TYPE.DISPLAY_NAME,
    }
  }

  if (bskyProfile.description?.toLocaleLowerCase().includes(lowerCaseNames.accountName)) {
    return {
      isSimilar: true,
      type: BSKY_USER_MATCH_TYPE.DESCRIPTION,
    }
  }

  return {
    isSimilar: false,
    type: BSKY_USER_MATCH_TYPE.NONE,
  }
}