import React, { FormEvent, ReactElement, useState } from 'react';
import { useDispatch } from 'react-redux';
import { setKey } from '../../store/notaryKey';
import keys from '../../utils/keys.json';

export default function NotaryKey(): ReactElement {
  const dispatch = useDispatch();

  const defaultKey: string = keys.defaultKey
  const notaryPseKey: string = keys.notaryPseKey

  const [notaryKey, setNotaryKey] = useState<string>(defaultKey);
  const [errors, setError] = useState<string | null>(null);


  const isValidPEMKey = (key: string): boolean => {
    try {

      const trimmedKey = key.trim();


      if (!trimmedKey.startsWith('-----BEGIN PUBLIC KEY-----') || !trimmedKey.endsWith('-----END PUBLIC KEY-----')) {
        setError('Invalid PEM format: header or footer missing');
        return false;
      }


      const keyContent = trimmedKey
        .replace('-----BEGIN PUBLIC KEY-----', '')
        .replace('-----END PUBLIC KEY-----', '')
        .trim();

      try {
        const decodedKeyContent = atob(keyContent);

      } catch (err) {
        console.log('here');
        setError('Invalid Base64 encoding');
        return false;
      }

      return true;
    } catch (err) {

      console.error('Error validating key:', err);
      return false;
    }
  };


  const handleInput = (e: FormEvent<HTMLTextAreaElement> | React.MouseEvent<HTMLButtonElement, MouseEvent>, key?: string | undefined) => {
    setError(null);
    const keyInput = key !== undefined ? key : (e.currentTarget instanceof HTMLTextAreaElement ? e.currentTarget.value : '');
    if (isValidPEMKey(keyInput)) {
      setNotaryKey(keyInput);
      dispatch(setKey(keyInput));
    } else {
      setNotaryKey(keyInput);
    }
  }

  return (
    <details className="w-3/4 m-auto">
      <summary className="text-2xl font-bold cursor-pointer">
        Change Notary Public Key:
      </summary>
      <textarea className="w-full h-40 rounded bg-gray-800 text-white resize-none" value={notaryKey} onChange={(e) => handleInput(e)}>
      </textarea>
      {errors && <p className="text-red-500">{errors}</p>}
      <button className="button" onClick={(e) => handleInput(e, notaryPseKey)}>
        notary.pse.dev
      </button>
      <button className="button" onClick={(e) => handleInput(e, defaultKey)}>
        Default
      </button>
    </details>
  )
}