restore-chat-by-pin.ts

import { useMutation, useQueryClient } from "@tanstack/react-query";
import { EncryptionTools } from "../utils";
import { NostrQueries, useKeysQuery, useNostrPublishMutation } from "../nostr";
import { Kind } from "nostr-tools";
import { useContext } from "react";
import { ChatContext } from "../chat-context-provider";
import { useGetKeysQuery, useSaveKeys } from "../api";

export function useRestoreChatByPin() {
  const queryClient = useQueryClient();
  const { activeUserData, activeUsername, storage } = useContext(ChatContext);

  const { publicKey } = useKeysQuery();
  const { data: keys } = useGetKeysQuery();

  const { mutateAsync: updateProfile } = useNostrPublishMutation(
    ["chats/update-nostr-profile"],
    Kind.Metadata,
    () => {},
  );
  const { mutateAsync: uploadKeys } = useSaveKeys();

  return useMutation({
    mutationKey: ["chats/restore-chat-by-pin"],
    mutationFn: async (pin: string) => {
      if (!pin || !publicKey || !activeUserData) {
        throw new Error(
          "[Chat][Nostr] – no pin, public key or account information",
        );
      }

      const { iv: initialVector, key: privateKey } = keys ?? {};

      if (!initialVector || !privateKey) {
        throw new Error("[Chat][Nostr] – no initial vector or private key");
      }

      const decryptedKey = EncryptionTools.decrypt(
        privateKey,
        pin,
        Buffer.from(initialVector, "base64"),
      );
      queryClient.setQueryData(
        [NostrQueries.PRIVATE_KEY, activeUsername],
        decryptedKey,
      );

      storage?.setItem("ecency_nostr_pr_" + activeUsername, pin);

      await updateProfile({
        tags: [["p", publicKey]],
        eventMetadata: {
          name: activeUsername!,
          about: "",
          picture: "",
        },
      });
    },
  });
}