import * as React from 'react';

import { Action } from 'redux-actions';

import Container from './widgets/Container';
import ExternalLink from './widgets/ExternalLink';
import SyncGate from './SyncGate';
import LoginForm from './components/LoginForm';
import EncryptionLoginForm from './components/EncryptionLoginForm';

import { store, CredentialsType } from './store';
import { deriveKey, fetchCredentials, fetchUserInfo } from './store/actions';

import * as EteSync from 'etesync';
import * as C from './constants';

import SignedPagesBadge from './images/signed-pages-badge.svg';
import LoadingIndicator from './widgets/LoadingIndicator';


function EncryptionPart(props: { credentials: CredentialsType }) {
  const [fetched, setFetched] = React.useState(false);
  const [userInfo, setUserInfo] = React.useState<EteSync.UserInfo>();
  const [error, setError] = React.useState<Error>();

  const credentials = props.credentials.value!;

  React.useEffect(() => {
    // FIXME: verify the error is a 404
    store.dispatch<any>(fetchUserInfo(credentials, credentials.credentials.email)).then((fetchedUserInfo: Action<EteSync.UserInfo>) => {
      setUserInfo(fetchedUserInfo.payload);
    }).finally(() => {
      setFetched(true);
    });
  }, [credentials]);

  if (!fetched) {
    return <LoadingIndicator />;
  }

  function onEncryptionFormSubmit(encryptionPassword: string) {
    const derivedAction = deriveKey(props.credentials.value!.credentials.email, encryptionPassword);
    if (userInfo) {
      const userInfoCryptoManager = userInfo.getCryptoManager(derivedAction.payload!);
      try {
        userInfo.verify(userInfoCryptoManager);
      } catch (e) {
        setError(new EteSync.EncryptionPasswordError('Wrong encryption password'));
        return;
      }
    }
    store.dispatch(derivedAction);
  }

  const isNewUser = !userInfo;

  return (
    <Container style={{ maxWidth: '30rem' }}>
      <h2>Encryption Password</h2>
      {(isNewUser) ?
        <div>
          <h3>Welcome to EteSync!</h3>
          <p>
            Please set your encryption password below, and make sure you got it right, as it <em>can't</em> be recovered if lost!
          </p>
        </div>
        :
        <p>
          You are logged in as <strong>{credentials.credentials.email}</strong>.
          Please enter your encryption password to continue, or log out from the side menu.
        </p>
      }

      <EncryptionLoginForm
        error={error}
        onSubmit={onEncryptionFormSubmit}
      />
    </Container>
  );
}


class LoginGate extends React.Component {
  public props: {
    credentials: CredentialsType;
  };

  constructor(props: any) {
    super(props);
    this.onFormSubmit = this.onFormSubmit.bind(this);
  }

  public onFormSubmit(username: string, password: string, serviceApiUrl?: string) {
    serviceApiUrl = serviceApiUrl ? serviceApiUrl : C.serviceApiBase;
    store.dispatch<any>(fetchCredentials(username, password, serviceApiUrl));
  }

  public render() {
    if (this.props.credentials.value === null) {
      const style = {
        isSafe: {
          textDecoration: 'none',
          display: 'block',
        },
        divider: {
          margin: '30px 0',
          color: '#00000025',
        },
      };

      return (
        <Container style={{ maxWidth: '30rem' }}>
          <h2>Please Log In</h2>
          <LoginForm
            onSubmit={this.onFormSubmit}
            error={this.props.credentials.error}
            loading={this.props.credentials.fetching}
          />
          <hr style={style.divider} />
          <ExternalLink style={style.isSafe} href="https://www.etesync.com/faq/#signed-pages">
            <img alt="SignedPgaes badge" src={SignedPagesBadge} />
          </ExternalLink>
          <ul>
            <li><ExternalLink style={style.isSafe} href={C.homePage}>
                The EteSync Website
            </ExternalLink></li>
            <li><ExternalLink style={style.isSafe} href={C.faq + '#web-client'}>
                Is the web client safe to use?
            </ExternalLink></li>
            <li><ExternalLink style={style.isSafe} href={C.sourceCode}>Source code</ExternalLink></li>
          </ul>
        </Container>
      );
    } else if (this.props.credentials.value.encryptionKey === null) {
      return (
        <EncryptionPart credentials={this.props.credentials} />
      );
    }

    return (
      <SyncGate etesync={this.props.credentials.value} />
    );
  }
}

export default LoginGate;