lume/src/app/chat/components/messages/form.tsx

import { ImagePicker } from '@lume/shared/form/imagePicker';
import { chatContentAtom } from '@lume/stores/chat';
import { FULL_RELAYS, WRITEONLY_RELAYS } from '@lume/stores/constants';
import { dateToUnix } from '@lume/utils/getDate';
import { useActiveAccount } from '@lume/utils/hooks/useActiveAccount';

import { useAtom } from 'jotai';
import { useResetAtom } from 'jotai/utils';
import { RelayPool } from 'nostr-relaypool';
import { getEventHash, nip04, signEvent } from 'nostr-tools';
import { useCallback } from 'react';

export default function ChatMessageForm({ receiverPubkey }: { receiverPubkey: string }) {
  const { account, isLoading, isError } = useActiveAccount();

  const [value, setValue] = useAtom(chatContentAtom);
  const resetValue = useResetAtom(chatContentAtom);

  const encryptMessage = useCallback(
    async (privkey: string) => {
      return await nip04.encrypt(privkey, receiverPubkey, value);
    },
    [receiverPubkey, value]
  );

  const submitEvent = () => {
    if (!isError && !isLoading && account) {
      encryptMessage(account.privkey)
        .then((encryptedContent) => {
          const pool = new RelayPool(WRITEONLY_RELAYS);
          const event: any = {
            content: encryptedContent,
            created_at: dateToUnix(),
            kind: 4,
            pubkey: account.pubkey,
            tags: [['p', receiverPubkey]],
          };
          event.id = getEventHash(event);
          event.sig = signEvent(event, account.privkey);
          // publish note
          pool.publish(event, FULL_RELAYS);
          // reset state
          resetValue();
        })
        .catch(console.error);
    }
  };

  const handleEnterPress = (e) => {
    if (e.key === 'Enter' && !e.shiftKey) {
      e.preventDefault();
      submitEvent();
    }
  };

  return (
    <div className="relative h-24 w-full shrink-0 overflow-hidden before:pointer-events-none before:absolute before:-inset-1 before:rounded-[11px] before:border before:border-fuchsia-500 before:opacity-0 before:ring-2 before:ring-fuchsia-500/20 before:transition after:pointer-events-none after:absolute after:inset-px after:rounded-[7px] after:shadow-highlight after:shadow-white/5 after:transition focus-within:before:opacity-100 focus-within:after:shadow-fuchsia-500/100 dark:focus-within:after:shadow-fuchsia-500/20">
      <div>
        <textarea
          value={value}
          onChange={(e) => setValue(e.target.value)}
          onKeyDown={handleEnterPress}
          spellCheck={false}
          placeholder="Message"
          className="relative h-24 w-full resize-none rounded-lg border border-black/5 px-3.5 py-3 text-sm shadow-input shadow-black/5 !outline-none placeholder:text-zinc-400 dark:bg-zinc-800 dark:text-zinc-200 dark:shadow-black/10 dark:placeholder:text-zinc-500"
        />
      </div>
      <div className="absolute bottom-2 w-full px-2">
        <div className="flex w-full items-center justify-between bg-zinc-800">
          <div className="flex items-center gap-2 divide-x divide-zinc-700">
            <ImagePicker type="chat" />
            <div className="flex items-center gap-2 pl-2"></div>
          </div>
          <div className="flex items-center gap-2">
            <button
              onClick={() => submitEvent()}
              disabled={value.length === 0 ? true : false}
              className="inline-flex h-8 w-16 items-center justify-center rounded-md bg-fuchsia-500 px-4 text-sm font-medium shadow-button hover:bg-fuchsia-600 disabled:pointer-events-none disabled:cursor-not-allowed disabled:opacity-50"
            >
              Send
            </button>
          </div>
        </div>
      </div>
    </div>
  );
}