import { Currency, CurrencyAmount, Price, Token, TradeType } from '@uniswap/sdk-core'
import { useMemo } from 'react'
import { ChainId } from 'wallet/src/constants/chains'
import { PollingInterval } from 'wallet/src/constants/misc'
import {
  USDBC_BASE,
  USDC,
  USDC_ARBITRUM,
  USDC_GOERLI,
  USDC_OPTIMISM,
  USDC_POLYGON,
  USDT_BNB,
} from 'wallet/src/constants/tokens'
import { useTrade } from 'wallet/src/features/transactions/swap/trade/legacy/hooks/useTrade'
import { areCurrencyIdsEqual, currencyId } from 'wallet/src/utils/currencyId'

// Stablecoin amounts used when calculating spot price for a given currency.
// The amount is large enough to filter low liquidity pairs.
export const STABLECOIN_AMOUNT_OUT: { [chainId: number]: CurrencyAmount<Token> } = {
  [ChainId.Mainnet]: CurrencyAmount.fromRawAmount(USDC, 100_000e6),
  [ChainId.Goerli]: CurrencyAmount.fromRawAmount(USDC_GOERLI, 100_000e6),
  [ChainId.ArbitrumOne]: CurrencyAmount.fromRawAmount(USDC_ARBITRUM, 10_000e6),
  [ChainId.Base]: CurrencyAmount.fromRawAmount(USDBC_BASE, 10_000e6),
  [ChainId.Bnb]: CurrencyAmount.fromRawAmount(USDT_BNB, 10_000e6),
  [ChainId.Polygon]: CurrencyAmount.fromRawAmount(USDC_POLYGON, 10_000e6),
  [ChainId.Optimism]: CurrencyAmount.fromRawAmount(USDC_OPTIMISM, 10_000e6),
}

/**
 * Returns the price in USDC of the input currency
 * @param currency currency to compute the USDC price of
 */
export function useUSDCPrice(
  currency?: Currency,
  pollingInterval?: PollingInterval
): Price<Currency, Currency> | undefined {
  const chainId = currency?.chainId

  const quoteAmount = chainId ? STABLECOIN_AMOUNT_OUT[chainId] : undefined
  const stablecoin = quoteAmount?.currency

  // avoid requesting quotes for stablecoin input
  const currencyIsStablecoin = Boolean(
    stablecoin && currency && areCurrencyIdsEqual(currencyId(currency), currencyId(stablecoin))
  )
  const amountSpecified = currencyIsStablecoin ? undefined : quoteAmount

  const { trade } = useTrade({
    amountSpecified,
    otherCurrency: currency,
    tradeType: TradeType.EXACT_OUTPUT,
    pollingInterval,
    isUSDQuote: true,
  })

  return useMemo(() => {
    if (!stablecoin) {
      return
    }

    if (currencyIsStablecoin) {
      // handle stablecoin
      return new Price(stablecoin, stablecoin, '1', '1')
    }

    if (!trade || !trade.routes.length || !trade.routes[0] || !quoteAmount || !currency) {
      return
    }

    const { numerator, denominator } = trade.routes[0].midPrice
    return new Price(currency, stablecoin, denominator, numerator)
  }, [currency, stablecoin, currencyIsStablecoin, quoteAmount, trade])
}

export function useUSDCValue(
  currencyAmount: CurrencyAmount<Currency> | undefined | null
): CurrencyAmount<Currency> | null {
  const price = useUSDCPrice(currencyAmount?.currency)

  return useMemo(() => {
    if (!price || !currencyAmount) {
      return null
    }
    try {
      return price.quote(currencyAmount)
    } catch (error) {
      return null
    }
  }, [currencyAmount, price])
}
