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src/hooks/useCurrency.ts

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+import { useQuery } from '@tanstack/react-query'
+import { useTranslation } from 'react-i18next'
+import { currencyApi, type ExchangeRates } from '../api/currency'
+
+// Map language to currency
+const LANGUAGE_CURRENCY_MAP: Record<string, keyof ExchangeRates | 'RUB'> = {
+  ru: 'RUB',
+  en: 'USD',
+  zh: 'CNY',
+  fa: 'IRR',
+}
+
+// Default rates for fallback
+const DEFAULT_RATES: ExchangeRates = {
+  USD: 100,
+  CNY: 14,
+  IRR: 0.0024,
+}
+
+export function useCurrency() {
+  const { i18n, t } = useTranslation()
+
+  // Fetch exchange rates
+  const { data: exchangeRates = DEFAULT_RATES } = useQuery({
+    queryKey: ['exchange-rates'],
+    queryFn: currencyApi.getExchangeRates,
+    staleTime: 60 * 60 * 1000, // 1 hour
+    refetchOnWindowFocus: false,
+    retry: 2,
+  })
+
+  // Get current language and currency
+  const currentLanguage = i18n.language
+  const targetCurrency = LANGUAGE_CURRENCY_MAP[currentLanguage] || 'USD'
+
+  // Check if current language is Russian (no conversion needed)
+  const isRussian = currentLanguage === 'ru'
+
+  // Get currency symbol from translations
+  const currencySymbol = t('common.currency')
+
+  // Format amount with currency conversion
+  const formatAmount = (rubAmount: number, decimals: number = 2): string => {
+    if (isRussian) {
+      return rubAmount.toFixed(decimals)
+    }
+
+    // Convert to target currency
+    const convertedAmount = currencyApi.convertFromRub(
+      rubAmount,
+      targetCurrency as keyof ExchangeRates,
+      exchangeRates
+    )
+
+    // For IRR (Iranian Toman), use no decimals as amounts are large
+    if (targetCurrency === 'IRR') {
+      return Math.round(convertedAmount).toLocaleString('fa-IR')
+    }
+
+    return convertedAmount.toFixed(decimals)
+  }
+
+  // Format amount with currency symbol
+  const formatWithCurrency = (rubAmount: number, decimals: number = 2): string => {
+    return `${formatAmount(rubAmount, decimals)} ${currencySymbol}`
+  }
+
+  // Format amount with + sign (for earnings/bonuses)
+  const formatPositive = (rubAmount: number, decimals: number = 2): string => {
+    return `+${formatAmount(rubAmount, decimals)} ${currencySymbol}`
+  }
+
+  // Get raw converted amount (for calculations)
+  const convertAmount = (rubAmount: number): number => {
+    if (isRussian) {
+      return rubAmount
+    }
+    return currencyApi.convertFromRub(
+      rubAmount,
+      targetCurrency as keyof ExchangeRates,
+      exchangeRates
+    )
+  }
+
+  // Convert from user's currency back to rubles
+  const convertToRub = (amount: number): number => {
+    if (isRussian) {
+      return amount
+    }
+    return currencyApi.convertToRub(
+      amount,
+      targetCurrency as keyof ExchangeRates,
+      exchangeRates
+    )
+  }
+
+  return {
+    exchangeRates,
+    targetCurrency,
+    isRussian,
+    currencySymbol,
+    formatAmount,
+    formatWithCurrency,
+    formatPositive,
+    convertAmount,
+    convertToRub,
+  }
+}