import {
  Input,
  InputError,
  VegaIcon,
  VegaIconNames,
} from '@vegaprotocol/ui-toolkit';
import type { FieldValues } from 'react-hook-form';
import { useForm } from 'react-hook-form';
import classNames from 'classnames';
import { Navigate, useSearchParams } from 'react-router-dom';
import { useEffect, useRef, useState } from 'react';
import { Button } from './buttons';
import { useVegaWallet } from '@vegaprotocol/wallet';
import { useReferral } from './hooks/use-referral';
import { Routes } from '../../lib/links';
import { useTransactionEventSubscription } from '@vegaprotocol/web3';

export const ApplyCodeForm = () => {
  const [status, setStatus] = useState<
    'requested' | 'failed' | 'successful' | null
  >(null);
  const txHash = useRef<string | null>(null);
  const { isReadOnly, pubKey, sendTx } = useVegaWallet();
  const {
    register,
    handleSubmit,
    formState: { errors },
    setValue,
    setError,
  } = useForm();
  const [params] = useSearchParams();

  const { data: referee } = useReferral(pubKey, 'referee');
  const { data: referrer } = useReferral(pubKey, 'referrer');

  useEffect(() => {
    const code = params.get('code');
    if (code) setValue('code', code);
  }, [params, setValue]);

  const onSubmit = ({ code }: FieldValues) => {
    if (isReadOnly || !pubKey || !code || code.length === 0) {
      return;
    }

    setStatus('requested');

    sendTx(pubKey, {
      applyReferralCode: {
        id: code as string,
      },
    })
      .then((res) => {
        if (!res) {
          setError('code', {
            type: 'required',
            message: 'The transaction could not be sent',
          });
        }
        if (res) {
          txHash.current = res.transactionHash.toLowerCase();
        }
      })
      .catch((err) => {
        if (err.message.includes('user rejected')) {
          setStatus(null);
        } else {
          setError('code', {
            type: 'required',
            message: 'Your code has been rejected',
          });
        }
      });
  };

  useTransactionEventSubscription({
    variables: { partyId: pubKey || '' },
    skip: !pubKey,
    fetchPolicy: 'no-cache',
    onData: ({ data: result }) =>
      result.data?.busEvents?.forEach((event) => {
        if (event.event.__typename === 'TransactionResult') {
          const hash = event.event.hash.toLowerCase();
          if (txHash.current && txHash.current === hash) {
            const err = event.event.error;
            const status = event.event.status;
            if (err) {
              setStatus(null);
              setError('code', {
                type: 'required',
                message: err,
              });
            }
            if (status && !err) {
              setStatus('successful');
            }
          }
        }
      }),
  });

  if (referee || referrer) {
    return <Navigate to={Routes.REFERRALS} />;
  }

  if (status === 'successful') {
    return (
      <div className="w-1/2 mx-auto">
        <h3 className="mb-5 text-xl text-center uppercase calt flex flex-row gap-2 justify-center items-center">
          <span className="text-vega-green-500">
            <VegaIcon name={VegaIconNames.TICK} size={20} />
          </span>{' '}
          <span className="pt-1">Code applied</span>
        </h3>
      </div>
    );
  }

  const getButtonProps = () => {
    if (isReadOnly || !pubKey) {
      return {
        disabled: true,
        children: 'Apply',
      };
    }

    if (status === 'requested') {
      return {
        disabled: true,
        children: 'Confirm in wallet...',
      };
    }

    return {
      disabled: false,
      children: 'Apply',
    };
  };

  return (
    <div className="w-1/2 mx-auto">
      <h3 className="mb-5 text-xl text-center uppercase calt">
        Apply a referral code
      </h3>
      <p className="mb-6 text-center">Enter a referral code</p>
      <form
        className={classNames('w-full flex flex-col gap-3', {
          'animate-shake': Boolean(errors.code),
        })}
        onSubmit={handleSubmit(onSubmit)}
      >
        <label className="flex-grow">
          <span className="block mb-1 text-sm text-vega-clight-100 dark:text-vega-cdark-100">
            Your referral code
          </span>
          <Input
            hasError={Boolean(errors.code)}
            {...register('code', {
              required: 'You have to provide a code to apply it.',
            })}
          />
        </label>
        <Button className="w-full" type="submit" {...getButtonProps()} />
      </form>
      {errors.code && (
        <InputError>{errors.code.message?.toString()}</InputError>
      )}
    </div>
  );
};
