import EventEmitter from 'events'
import React, { useContext, useRef, useState, useEffect } from 'react'
import { useDispatch, useSelector } from 'react-redux'
import PropTypes from 'prop-types'
import classnames from 'classnames'
import { useHistory } from 'react-router-dom'
import { I18nContext } from '../../../contexts/i18n'
import { useNewMetricEvent } from '../../../hooks/useMetricEvent'
import { MetaMetricsContext } from '../../../contexts/metametrics.new'
import { getCurrentCurrency, conversionRateSelector } from '../../../selectors'
import {
  getUsedQuote, getFetchParams, getApproveTxParams, getSwapsTradeTxParams,
  fetchQuotesAndSetQuoteState,
  navigateBackToBuildQuote,
  prepareForRetryGetQuotes,
  prepareToLeaveSwaps,
} from '../../../ducks/swaps/swaps'
import { useTransactionTimeRemaining } from '../../../hooks/useTransactionTimeRemaining'
import { usePrevious } from '../../../hooks/usePrevious'
import Mascot from '../../../components/ui/mascot'
import PulseLoader from '../../../components/ui/pulse-loader'
import { getBlockExplorerUrlForTx } from '../../../helpers/utils/transactions.util'
import CountdownTimer from '../countdown-timer'
import {
  QUOTES_EXPIRED_ERROR,
  SWAP_FAILED_ERROR,
  ERROR_FETCHING_QUOTES,
  QUOTES_NOT_AVAILABLE_ERROR,
  OFFLINE_FOR_MAINTENANCE,
} from '../../../helpers/constants/swaps'
import { ASSET_ROUTE, DEFAULT_ROUTE } from '../../../helpers/constants/routes'

import { getRenderableGasFeesForQuote } from '../swaps.util'
import SwapsFooter from '../swaps-footer'
import SwapFailureIcon from './swap-failure-icon'
import SwapSuccessIcon from './swap-success-icon'
import QuotesTimeoutIcon from './quotes-timeout-icon'
import ViewOnEtherScanLink from './view-on-ether-scan-link'

export default function AwaitingSwap ({
  swapComplete,
  errorKey,
  symbol,
  txHash,
  networkId,
  tokensReceived,
  rpcPrefs,
  submittingSwap,
  tradeTxData,
  usedGasPrice,
  inputValue,
  maxSlippage,
}) {
  const t = useContext(I18nContext)
  const metaMetricsEvent = useContext(MetaMetricsContext)
  const history = useHistory()
  const dispatch = useDispatch()
  const animationEventEmitter = useRef(new EventEmitter())

  const fetchParams = useSelector(getFetchParams)
  const { destinationTokenInfo, sourceTokenInfo } = fetchParams?.metaData || {}
  const usedQuote = useSelector(getUsedQuote)
  const approveTxParams = useSelector(getApproveTxParams)
  const tradeTxParams = useSelector(getSwapsTradeTxParams)
  const currentCurrency = useSelector(getCurrentCurrency)
  const conversionRate = useSelector(conversionRateSelector)

  const [timeRemainingExpired, setTimeRemainingExpired] = useState(false)
  const [trackedQuotesExpiredEvent, setTrackedQuotesExpiredEvent] = useState(false)

  let feeinFiat
  if (usedQuote && tradeTxParams) {
    const renderableGasFees = getRenderableGasFeesForQuote(usedQuote.gasEstimateWithRefund || usedQuote.averageGas, approveTxParams?.gas || '0x0', tradeTxParams.gasPrice, currentCurrency, conversionRate)
    feeinFiat = renderableGasFees.feeinFiat?.slice(1)
  }

  const quotesExpiredEvent = useNewMetricEvent({
    event: 'Quotes Timed Out',
    excludeMetaMetricsId: true,
    properties: {
      token_from: sourceTokenInfo?.symbol,
      token_from_amount: fetchParams?.value,
      token_to: destinationTokenInfo?.symbol,
      request_type: fetchParams?.balanceError ? 'Quote' : 'Order',
      slippage: fetchParams?.slippage,
      custom_slippage: fetchParams?.slippage === 2,
      gas_fees: feeinFiat,
    },
    category: 'swaps',
  })
  const anonymousQuotesExpiredEvent = useNewMetricEvent({ event: 'Quotes Timed Out', category: 'swaps' })

  const blockExplorerUrl = txHash && getBlockExplorerUrlForTx(
    networkId,
    txHash,
    rpcPrefs,
  )

  const timeRemaining = useTransactionTimeRemaining(true, true, tradeTxData?.submittedTime, usedGasPrice, true, true)
  const previousTimeRemaining = usePrevious(timeRemaining)
  const timeRemainingIsNumber = typeof timeRemaining === 'number' && !isNaN(timeRemaining)
  const previousTimeRemainingIsNumber = typeof previousTimeRemaining === 'number' && !isNaN(previousTimeRemaining)
  const estimatedTransactionWaitTime = timeRemaining * 1000 * 60

  useEffect(() => {
    if (!timeRemainingIsNumber && previousTimeRemainingIsNumber && !timeRemainingExpired) {
      setTimeRemainingExpired(true)
    }
  }, [timeRemainingIsNumber, previousTimeRemainingIsNumber, timeRemainingExpired])

  let countdownText
  if (timeRemainingIsNumber && !timeRemainingExpired && tradeTxData?.submittedTime) {
    countdownText = <CountdownTimer timeStarted={tradeTxData?.submittedTime} timerBase={estimatedTransactionWaitTime} timeOnly />
  } else if (tradeTxData?.submittedTime) {
    countdownText = t('swapsAlmostDone')
  } else {
    countdownText = t('swapEstimatedTimeCalculating')
  }

  let headerText
  let statusImage
  let descriptionText
  let submitText
  let content

  if (errorKey === OFFLINE_FOR_MAINTENANCE) {
    headerText = t('offlineForMaintenance')
    descriptionText = t('metamaskSwapsOfflineDescription')
    submitText = t('close')
    statusImage = <SwapFailureIcon />
  } else if (errorKey === SWAP_FAILED_ERROR) {
    headerText = t('swapFailedErrorTitle')
    descriptionText = t('swapFailedErrorDescription')
    submitText = t('tryAgain')
    statusImage = <SwapFailureIcon />
    content = blockExplorerUrl && (
      <ViewOnEtherScanLink
        txHash={txHash}
        blockExplorerUrl={blockExplorerUrl}
        isCustomBlockExplorerUrl={Boolean(rpcPrefs.blockExplorerUrl)}
      />
    )
  } else if (errorKey === QUOTES_EXPIRED_ERROR) {
    headerText = t('swapQuotesExpiredErrorTitle')
    descriptionText = t('swapQuotesExpiredErrorDescription')
    submitText = t('tryAgain')
    statusImage = <QuotesTimeoutIcon />

    if (!trackedQuotesExpiredEvent) {
      setTrackedQuotesExpiredEvent(true)
      quotesExpiredEvent()
      anonymousQuotesExpiredEvent()
    }
  } else if (errorKey === ERROR_FETCHING_QUOTES) {
    headerText = t('swapFetchingQuotesErrorTitle')
    descriptionText = t('swapFetchingQuotesErrorDescription')
    submitText = t('back')
    statusImage = <SwapFailureIcon />
  } else if (errorKey === QUOTES_NOT_AVAILABLE_ERROR) {
    headerText = t('swapQuotesNotAvailableErrorTitle')
    descriptionText = t('swapQuotesNotAvailableErrorDescription')
    submitText = t('tryAgain')
    statusImage = <SwapFailureIcon />
  } else if (!errorKey && !swapComplete) {

    /**
     * only show estimated time if the transaction has a submitted time, the swap has
     * not yet completed and there isn't an error. If the swap has not completed and
     * there is no error, but also has no submitted time (has not yet been published),
     * then we apply the invisible class to the time estimate div. This creates consistent
     * spacing before and after display of the time estimate.
     */
    headerText = t('swapProcessing')
    statusImage = <PulseLoader />
    submitText = t('swapsViewInActivity')
    descriptionText = t('swapOnceTransactionHasProcess', [<span key="swapOnceTransactionHasProcess-1" className="awaiting-swap__amount-and-symbol">{symbol}</span>])
    content = (
      <>
        <div
          className={classnames('awaiting-swap__time-estimate', {
            'awaiting-swap__time-estimate--invisible': !tradeTxData?.submittedTime,
          })}
        >
          {t('swapEstimatedTimeFull', [
            <span className="awaiting-swap__time-estimate-text" key="swapEstimatedTime-1">{t('swapEstimatedTime')}</span>,
            countdownText,
          ])}
        </div>
        {blockExplorerUrl && (
          <ViewOnEtherScanLink
            txHash={txHash}
            blockExplorerUrl={blockExplorerUrl}
            isCustomBlockExplorerUrl={Boolean(rpcPrefs.blockExplorerUrl)}
          />
        )}
      </>
    )
  } else if (!errorKey && swapComplete) {
    headerText = t('swapTransactionComplete')
    statusImage = <SwapSuccessIcon />
    submitText = t('swapViewToken', [symbol])
    descriptionText = t('swapTokenAvailable', [<span key="swapTokenAvailable-2" className="awaiting-swap__amount-and-symbol">{`${tokensReceived || ''} ${symbol}`}</span>])
    content = blockExplorerUrl && (
      <ViewOnEtherScanLink
        txHash={txHash}
        blockExplorerUrl={blockExplorerUrl}
        isCustomBlockExplorerUrl={Boolean(rpcPrefs.blockExplorerUrl)}
      />
    )
  }

  return (
    <div className="awaiting-swap">
      <div className="awaiting-swap__content">
        {!(swapComplete || errorKey) && (
          <Mascot
            animationEventEmitter={animationEventEmitter.current}
            width="90"
            height="90"
          />
        )}
        <div className="awaiting-swap__status-image">
          {statusImage}
        </div>
        <div className="awaiting-swap__header">
          {headerText}
        </div>
        <div className="awaiting-swap__main-descrption">
          {descriptionText}
        </div>
        {content}
      </div>
      <SwapsFooter
        onSubmit={async () => {
          if (errorKey === OFFLINE_FOR_MAINTENANCE) {
            await dispatch(prepareToLeaveSwaps())
            history.push(DEFAULT_ROUTE)
          } else if (errorKey === QUOTES_EXPIRED_ERROR) {
            dispatch(prepareForRetryGetQuotes())
            await dispatch(fetchQuotesAndSetQuoteState(history, inputValue, maxSlippage, metaMetricsEvent))
          } else if (errorKey) {
            await dispatch(navigateBackToBuildQuote(history))
          } else if (destinationTokenInfo?.symbol === 'ETH') {
            history.push(DEFAULT_ROUTE)
          } else {
            history.push(`${ASSET_ROUTE}/${destinationTokenInfo?.address}`)
          }
        }}
        onCancel={async () => await dispatch(navigateBackToBuildQuote(history))}
        submitText={submitText}
        disabled={submittingSwap}
        hideCancel={errorKey !== QUOTES_EXPIRED_ERROR}
      />
    </div>
  )
}

AwaitingSwap.propTypes = {
  swapComplete: PropTypes.bool,
  symbol: PropTypes.string.isRequired,
  networkId: PropTypes.string.isRequired,
  txHash: PropTypes.string,
  tokensReceived: PropTypes.string,
  rpcPrefs: PropTypes.object.isRequired,
  errorKey: PropTypes.oneOf([
    QUOTES_EXPIRED_ERROR,
    SWAP_FAILED_ERROR,
    ERROR_FETCHING_QUOTES,
    QUOTES_NOT_AVAILABLE_ERROR,
    OFFLINE_FOR_MAINTENANCE,
  ]),
  submittingSwap: PropTypes.bool,
  tradeTxData: PropTypes.object,
  usedGasPrice: PropTypes.oneOfType([PropTypes.number, PropTypes.string]),
  inputValue: PropTypes.oneOfType([PropTypes.number, PropTypes.string]),
  maxSlippage: PropTypes.number,
}