import {useEffect, useState} from 'react';
import Head from 'next/head';
import {serverSideTranslations} from 'next-i18next/serverSideTranslations';
import {useTranslation} from 'next-i18next';
import {Container} from 'reactstrap';
import {faCheck} from '@fortawesome/free-solid-svg-icons';
import BallotDesktop from '@components/ballot/BallotDesktop';
import Button from '@components/Button';
import BallotMobile from '@components/ballot/BallotMobile';
import Blur from '@components/Blur';
import {
  getElection,
  getBallot,
  castBallot,
  ElectionPayload,
  BallotPayload,
  ErrorPayload,
} from '@services/api';
import {
  useBallot,
  BallotTypes,
  BallotProvider,
} from '@services/BallotContext';
import {getUrl, RouteTypes} from '@services/routes';
import {isEnded} from '@services/utils';
import WaitingBallot from '@components/WaitingBallot';
import PatternedBackground from '@components/PatternedBackground';

const shuffle = (array) => array.sort(() => Math.random() - 0.5);

export async function getServerSideProps({query: {pid, tid}, locale}) {
  if (!pid) {
    return {notFound: true};
  }
  const electionRef = pid.replaceAll('-', '');

  const [election, ballot, translations] = await Promise.all([
    getElection(electionRef),
    tid ? getBallot(tid) : null,
    serverSideTranslations(locale, ['resource']),
  ]);

  if ('message' in election) {
    return {notFound: true};
  }

  if (isEnded(election.date_end)) {
    return {
      redirect: {
        destination: getUrl(RouteTypes.ENDED_VOTE, electionRef),
        permanent: false,
      },
    };
  }

  if (
    !election ||
    !election.candidates ||
    !Array.isArray(election.candidates)
  ) {
    return {notFound: true};
  }

  const description = JSON.parse(election.description);

  if (description.randomOrder) {
    shuffle(election.candidates);
  }

  return {
    props: {
      ...translations,
      election,
      token: tid || null,
      previousBallot: ballot || null,
    },
  };
}

const ButtonSubmit = () => {
  const {t} = useTranslation();

  const [ballot, dispatch] = useBallot();
  const disabled = ballot.votes.length !== ballot.election.candidates.length;
  return (
    <Container className="my-5 d-md-flex d-grid justify-content-md-center">
      <Button
        outline={true}
        color="secondary"
        className="bg-blue"
        role="submit"
        disabled={disabled}
        icon={faCheck}
        position="left"
      >
        {t('vote.submit')}
      </Button>
    </Container>
  );
};

interface VoteInterface {
  election: ElectionPayload;
  err: string;
  token?: string;
  previousBallot: BallotPayload
}
const VoteBallot = ({election, token, previousBallot}: VoteInterface) => {
  const {t} = useTranslation();

  const [ballot, dispatch] = useBallot();

  const [voting, setVoting] = useState(false);
  const [payload, setPayload] = useState<BallotPayload | null>(null);
  const [error, setError] = useState<ErrorPayload | null>(null);

  useEffect(() => {
    dispatch({
      type: BallotTypes.ELECTION,
      election: election,
    });
  }, []);

  if (!ballot.election) {
    return <div>"Loading..."</div>;
  }

  const handleSubmit = async (event) => {
    event.preventDefault();
    setVoting(true);

    try {
      const res = await castBallot(ballot.votes, ballot.election, token);
      if (res.status !== 200) {
        console.error(res);
        const msg = await res.json();
        setError(msg);
      } else {
        const msg = await res.json();
        setPayload(msg);
      }
    } catch (err) {
      console.error(err);
      setError(err.message);
    }
  };

  if (voting) {
    return (
      <PatternedBackground>
        <WaitingBallot ballot={payload} error={error} />
      </PatternedBackground>
    );
  }

  return (
    <form
      className="w-100  flex-fill d-flex align-items-center"
      onSubmit={handleSubmit}
      autoComplete="off"
    >
      <Head>
        <title>{election.name}</title>

        <meta key="og:title" property="og:title" content={election.name} />
        <meta
          property="og:description"
          key="og:description"
          content={t('common.application')}
        />
      </Head>

      <Blur />
      <div className="w-100 h-100 d-flex flex-column justify-content-center">
        <BallotDesktop hasVoted={previousBallot != null} />
        <BallotMobile hasVoted={previousBallot != null} />
        <ButtonSubmit />
      </div>
    </form>
  );
};

const Ballot = (props) => {
  return (
    <BallotProvider>
      <VoteBallot {...props} />
    </BallotProvider>
  );
};

export default Ballot;
