// @flow
import type { OauthAppResponse } from 'services/api/oauth';
import React, { Component } from 'react';
import classNames from 'classnames';
import { FormattedMessage as Message } from 'react-intl';
import { Helmet } from 'react-helmet';
import { LinkButton } from 'components/ui/form';
import { COLOR_GREEN, COLOR_BLUE } from 'components/ui';
import { ContactLink } from 'components/contact';

import styles from './applicationsIndex.scss';
import messages from './ApplicationsIndex.intl.json';
import cubeIcon from './icons/cube.svg';
import loadingCubeIcon from './icons/loading-cube.svg';
import toolsIcon from './icons/tools.svg';
import ApplicationsList from './list';

type Props = {
  clientId?: ?string,
  resetClientId: () => void, // notify parent to remove clientId from current location.href
  displayForGuest: boolean,
  applications: Array<OauthAppResponse>,
  isLoading: boolean,
  deleteApp: string => Promise<any>,
  resetApp: (string, boolean) => Promise<any>,
};

export default class ApplicationsIndex extends Component<Props> {
  render() {
    return (
      <div className={styles.container}>
        <div className={styles.welcomeContainer}>
          <Message {...messages.accountsForDevelopers}>
            {(pageTitle: string) => (
              <h2 className={styles.welcomeTitle}>
                <Helmet title={pageTitle} />
                {pageTitle}
              </h2>
            )}
          </Message>
          <div className={styles.welcomeTitleDelimiter} />
          <div className={styles.welcomeParagraph}>
            <Message
              {...messages.accountsAllowsYouYoUseOauth2}
              values={{
                ourDocumentation: (
                  <a href="https://docs.ely.by/en/oauth.html" target="_blank">
                    <Message {...messages.ourDocumentation} />
                  </a>
                ),
              }}
            />
          </div>
          <div className={styles.welcomeParagraph}>
            <Message
              {...messages.ifYouHaveAnyTroubles}
              values={{
                feedback: (
                  <ContactLink>
                    <Message {...messages.feedback} />
                  </ContactLink>
                ),
              }}
            />
          </div>
        </div>

        {this.getContent()}
      </div>
    );
  }

  getContent() {
    const {
      displayForGuest,
      applications,
      isLoading,
      resetApp,
      deleteApp,
      clientId,
      resetClientId,
    } = this.props;

    if (applications.length > 0) {
      return (
        <ApplicationsList
          applications={applications}
          resetApp={resetApp}
          deleteApp={deleteApp}
          clientId={clientId}
          resetClientId={resetClientId}
        />
      );
    }

    if (displayForGuest) {
      return <Guest />;
    }

    return <Loader noApps={!isLoading} />;
  }
}

function Loader({ noApps }: { noApps: boolean }) {
  return (
    <div className={styles.emptyState} data-e2e={noApps ? 'noApps' : 'loading'}>
      <img
        src={noApps ? cubeIcon : loadingCubeIcon}
        className={styles.emptyStateIcon}
      />

      <div
        className={classNames(styles.noAppsContainer, {
          [styles.noAppsAnimating]: noApps,
        })}
      >
        <div className={styles.emptyStateText}>
          <div>
            <Message {...messages.youDontHaveAnyApplication} />
          </div>
          <div>
            <Message {...messages.shallWeStart} />
          </div>
        </div>

        <LinkButton
          to="/dev/applications/new"
          data-e2e="newApp"
          label={messages.addNew}
          color={COLOR_GREEN}
          className={styles.emptyStateActionButton}
        />
      </div>
    </div>
  );
}

function Guest() {
  return (
    <div className={styles.emptyState}>
      <img src={toolsIcon} className={styles.emptyStateIcon} />
      <div className={styles.emptyStateText}>
        <div>
          <Message {...messages.weDontKnowAnythingAboutYou} />
        </div>
        <div>
          <Message {...messages.youMustAuthToBegin} />
        </div>
      </div>

      <LinkButton
        to="/login"
        label={messages.authorization}
        color={COLOR_BLUE}
        className={styles.emptyStateActionButton}
      />
    </div>
  );
}