import { useCallback, useEffect, useMemo, useState } from 'react'
import { useTranslation } from 'react-i18next'
import type { DepositWithdrawConfig } from '@/api'
import {
  DEFAULT_CURRENCY_CODE,
  DEFAULT_WITHDRAW_CONFIG,
  QUICK_FIAT_AMOUNTS,
  WITHDRAW_EMAIL_PATTERN,
  WITHDRAW_PHONE_PATTERN,
} from '@/constants'
import { useDepositWithdrawConfig } from '@/hooks/use-deposit-withdraw-config'
import { useAuthStore } from '@/store'

function formatNumber(locale: string, value: number) {
  return new Intl.NumberFormat(locale).format(value)
}

function getInitialWithdrawAmount(
  selectedRate: number,
  maxWithdrawAmount: number,
) {
  if (maxWithdrawAmount <= 0) {
    return 0
  }

  return Math.min(
    maxWithdrawAmount,
    Math.max(1, Math.round(selectedRate * QUICK_FIAT_AMOUNTS[0])),
  )
}

function getActiveCurrencyCode(
  currencies: DepositWithdrawConfig['currencies'],
  selectedCurrencyCode: string,
) {
  return (
    currencies.find((item) => item.code === selectedCurrencyCode) ??
    currencies[0] ??
    DEFAULT_WITHDRAW_CONFIG.currencies[0]
  )
}

function getNormalizedConfig(
  config: DepositWithdrawConfig | undefined,
  fallback: DepositWithdrawConfig,
) {
  return config ?? fallback
}

function isValidEmail(value: string) {
  if (value.trim().length === 0) {
    return false
  }

  return WITHDRAW_EMAIL_PATTERN.test(value.trim())
}

function isValidPhone(value: string) {
  const normalized = value.replace(/[^\d+]/g, '')

  if (normalized.length === 0) {
    return false
  }

  return WITHDRAW_PHONE_PATTERN.test(normalized)
}

export function useWithdrawVm() {
  const { i18n, t } = useTranslation()
  const currentUser = useAuthStore((state) => state.currentUser)
  const withdrawConfigQuery = useDepositWithdrawConfig()
  const config = useMemo(() => {
    const baseConfig = getNormalizedConfig(
      withdrawConfigQuery.data,
      DEFAULT_WITHDRAW_CONFIG,
    )

    return {
      ...baseConfig,
      currencies:
        baseConfig.currencies.length > 0
          ? baseConfig.currencies
          : DEFAULT_WITHDRAW_CONFIG.currencies,
      payChannels: baseConfig.payChannels,
      withdraw: {
        ...baseConfig.withdraw,
        banks: baseConfig.withdraw.banks,
      },
    }
  }, [withdrawConfigQuery.data])
  const locale = i18n.resolvedLanguage ?? i18n.language ?? 'en-US'

  const [amount, setAmountState] = useState(0)
  const [hasInitializedAmount, setHasInitializedAmount] = useState(false)
  const [currencyCode, setCurrencyCode] = useState(
    config.currencies[0]?.code ?? DEFAULT_CURRENCY_CODE,
  )
  const [paymentChannelCode, setPaymentChannelCode] = useState('')
  const [bankCode, setBankCode] = useState('')
  const [holderName, setHolderName] = useState('')
  const [bankAccount, setBankAccount] = useState('')
  const [receiverEmail, setReceiverEmail] = useState('')
  const [receiverPhone, setReceiverPhone] = useState('')

  const selectedCurrency = getActiveCurrencyCode(
    config.currencies,
    currencyCode,
  )
  const selectedRate = selectedCurrency.withdrawCoinsPerFiatValue || 1
  const sortedPayChannels = useMemo(
    () =>
      [...config.payChannels]
        .filter((channel) => channel.status === 1)
        .sort((left, right) => left.sort - right.sort),
    [config.payChannels],
  )
  const sortedBanks = useMemo(
    () =>
      [...config.withdraw.banks]
        .filter((bank) => bank.status === 1)
        .sort((left, right) => left.sort - right.sort),
    [config.withdraw.banks],
  )
  const availableBalance = Number(currentUser?.coin ?? 0)
  const maxWithdrawAmount = Math.max(0, Math.floor(availableBalance))
  const selectedPaymentChannel =
    sortedPayChannels.find((channel) => channel.code === paymentChannelCode) ??
    null
  const setAmount = useCallback(
    (nextAmount: number) => {
      setAmountState(
        Math.min(maxWithdrawAmount, Math.max(0, Math.floor(nextAmount))),
      )
    },
    [maxWithdrawAmount],
  )

  useEffect(() => {
    if (
      selectedCurrency &&
      selectedCurrency.code !== currencyCode &&
      config.currencies.some((item) => item.code === currencyCode)
    ) {
      return
    }

    if (selectedCurrency && selectedCurrency.code !== currencyCode) {
      setCurrencyCode(selectedCurrency.code)
    }
  }, [config.currencies, currencyCode, selectedCurrency])

  useEffect(() => {
    const firstAvailablePayChannel = sortedPayChannels[0]

    if (!firstAvailablePayChannel) {
      if (paymentChannelCode) {
        setPaymentChannelCode('')
      }

      return
    }

    const hasSelectedAvailablePayChannel = sortedPayChannels.some(
      (channel) => channel.code === paymentChannelCode,
    )

    if (!hasSelectedAvailablePayChannel) {
      setPaymentChannelCode(firstAvailablePayChannel.code)
    }
  }, [paymentChannelCode, sortedPayChannels])

  useEffect(() => {
    if (sortedBanks.length === 0) {
      if (bankCode) {
        setBankCode('')
      }

      return
    }

    const hasSelectedAvailableBank = sortedBanks.some(
      (bank) => bank.code === bankCode,
    )

    if (!hasSelectedAvailableBank) {
      setBankCode('')
    }
  }, [bankCode, sortedBanks])

  useEffect(() => {
    if (!hasInitializedAmount && selectedRate > 0) {
      setAmount(getInitialWithdrawAmount(selectedRate, maxWithdrawAmount))
      setHasInitializedAmount(true)
    }
  }, [hasInitializedAmount, maxWithdrawAmount, selectedRate, setAmount])

  useEffect(() => {
    if (amount > maxWithdrawAmount) {
      setAmount(maxWithdrawAmount)
    }
  }, [amount, maxWithdrawAmount, setAmount])

  const quickAmounts = useMemo(() => {
    return QUICK_FIAT_AMOUNTS.map((fiatAmount) => ({
      diamonds: Math.min(
        maxWithdrawAmount,
        Math.max(1, Math.round(selectedRate * fiatAmount)),
      ),
      id: `quick-${selectedCurrency.code}-${fiatAmount}`,
      preview: `${selectedCurrency.code} ${formatNumber(locale, fiatAmount)}`,
    }))
  }, [locale, maxWithdrawAmount, selectedCurrency.code, selectedRate])

  const resetForm = useCallback(() => {
    const nextCurrencyCode = config.currencies[0]?.code ?? DEFAULT_CURRENCY_CODE
    const nextCurrency = getActiveCurrencyCode(
      config.currencies,
      nextCurrencyCode,
    )
    const nextRate = nextCurrency.withdrawCoinsPerFiatValue || 1

    setAmountState(getInitialWithdrawAmount(nextRate, maxWithdrawAmount))
    setHasInitializedAmount(true)
    setCurrencyCode(nextCurrencyCode)
    setPaymentChannelCode(sortedPayChannels[0]?.code ?? '')
    setBankCode('')
    setHolderName('')
    setBankAccount('')
    setReceiverEmail('')
    setReceiverPhone('')
  }, [config.currencies, maxWithdrawAmount, sortedPayChannels])

  const selectedCurrencyPreview = useMemo(
    () => ({
      currencyCode: selectedCurrency.code,
      currencyLabel: selectedCurrency.label,
      exchangeRateLabel: t('gameDesktop.withdraw.preview.exchangeRate', {
        currency: selectedCurrency.code,
      }),
      exchangeRateValue: t('gameDesktop.withdraw.preview.exchangeRateValue', {
        coins: formatNumber(locale, selectedRate),
        currency: selectedCurrency.code,
        platformCoinLabel: config.platformCoinLabel,
      }),
      convertibleLabel: t('gameDesktop.withdraw.preview.convertible', {
        currency: selectedCurrency.code,
      }),
      convertibleValue: `${formatNumber(
        locale,
        selectedRate > 0 ? amount / selectedRate : 0,
      )} ${selectedCurrency.code}`,
    }),
    [
      amount,
      config.platformCoinLabel,
      locale,
      selectedCurrency.code,
      selectedCurrency.label,
      selectedRate,
      t,
    ],
  )

  return {
    amount,
    amountExceedsBalance: amount > maxWithdrawAmount,
    amountRequiredError: amount <= 0,
    availableBalance,
    bankAccount,
    bankAccountError: bankAccount.trim().length === 0,
    bankCode,
    bankCodeError: bankCode.trim().length === 0,
    config,
    currencyCode,
    holderName,
    holderNameError: holderName.trim().length === 0,
    isLoading: withdrawConfigQuery.isLoading,
    isRefetching: withdrawConfigQuery.isFetching,
    maxWithdrawAmount,
    paymentChannelCode,
    paymentChannelCodeError: paymentChannelCode.trim().length === 0,
    quickAmounts,
    receiverEmail,
    receiverEmailError: !isValidEmail(receiverEmail),
    receiverPhone,
    receiverPhoneError: !isValidPhone(receiverPhone),
    selectedCurrency,
    selectedCurrencyPreview,
    selectedPaymentChannel,
    selectedRate,
    resetForm,
    setAmount,
    setBankAccount,
    setBankCode,
    setCurrencyCode,
    setHolderName,
    setPaymentChannelCode,
    setReceiverEmail,
    setReceiverPhone,
    sortedBanks,
    sortedPayChannels,
    withdrawCopy: {
      bankLabel: t('gameDesktop.withdraw.bank'),
      eWalletLabel: t('gameDesktop.withdraw.eWallet'),
      feeNote: config.withdraw.feeNote,
      noticeLabel: t('gameDesktop.withdraw.notice'),
      processingLabel: t('gameDesktop.withdraw.processingTime'),
      processingValue: config.withdraw.processingNote,
      rateHint: config.withdraw.rateHint,
    },
  }
}