// Copyright 2017-2020 @polkadot/ui-staking authors & contributors
// This software may be modified and distributed under the terms
// of the Apache-2.0 license. See the LICENSE file for details.

import React, { useState } from 'react';
import { Button, ButtonCancel, Input, InputAddress, Modal, TxButton } from '@polkadot/react-components';
import { useApi } from '@polkadot/react-hooks';

import ValidationSessionKey from './InputValidationSessionKey';
import { useTranslation } from '../../translate';

interface Props {
  controllerId: string;
  isOpen: boolean;
  onClose: () => void;
  sessionIds: string[];
  stashId: string;
}

const EMPTY_PROOF = new Uint8Array();

export default function SetSessionKey ({ controllerId, isOpen, onClose, sessionIds, stashId }: Props): React.ReactElement<Props> | null {
  const { t } = useTranslation();
  const { isSubstrateV2 } = useApi();
  const [keysError, setKeysError] = useState<string | null>(null);
  const [keys, setKeys] = useState<string | null>(
    isSubstrateV2
      ? null
      : sessionIds[0] || controllerId
  );

  if (!isOpen) {
    return null;
  }

  const hasError = isSubstrateV2
    ? !keys
    : (!keys || !!keysError);

  return (
    <Modal
      className='staking--SetSessionAccount'
      header={t('Set Session Key')}
      size='small'
    >
      <Modal.Content className='ui--signer-Signer-Content'>
        <InputAddress
          className='medium'
          defaultValue={controllerId}
          isDisabled
          label={t('controller account')}
        />
        {isSubstrateV2
          ? (
            <Input
              className='medium'
              help={t('Changing the key only takes effect at the start of the next session. The input here is generates from the author_rotateKeys command')}
              isError={!keys}
              label={t('Keys from rotateKeys')}
              onChange={setKeys}
            />
          )
          : (
            <>
              <InputAddress
                className='medium'
                help={t('Changing the key only takes effect at the start of the next session. If validating, it must be an ed25519 key.')}
                isError={!!keysError}
                label={t('Session key (ed25519)')}
                onChange={setKeys}
                value={keys}
              />
              <ValidationSessionKey
                controllerId={controllerId}
                onError={setKeysError}
                sessionId={keys}
                stashId={stashId}
              />
            </>
          )
        }
      </Modal.Content>
      <Modal.Actions>
        <Button.Group>
          <ButtonCancel onClick={onClose} />
          <Button.Or />
          <TxButton
            accountId={controllerId}
            isDisabled={hasError}
            isPrimary
            label={t('Set Session Key')}
            icon='sign-in'
            onClick={onClose}
            params={
              isSubstrateV2
                ? [keys, EMPTY_PROOF]
                : [keys]
            }
            tx={
              isSubstrateV2
                ? 'session.setKeys'
                : 'session.setKey'
            }
          />
        </Button.Group>
      </Modal.Actions>
    </Modal>
  );
}