nextjs-app/src/lib/utils.ts

import { ClassValue, clsx } from 'clsx'
import { twMerge } from 'tailwind-merge'

export function cn(...inputs: ClassValue[]) {
  return twMerge(clsx(inputs))
}

export type MarketType = 'bist' | 'us'

function localeFor(market: MarketType = 'bist') {
  return market === 'us' ? 'en-US' : 'tr-TR'
}

function currencyFor(market: MarketType = 'bist') {
  return market === 'us' ? 'USD' : 'TRY'
}

export function formatCurrency(value: number, market: MarketType = 'bist'): string {
  return new Intl.NumberFormat(localeFor(market), {
    style: 'currency',
    currency: currencyFor(market),
    minimumFractionDigits: 2,
  }).format(value)
}

export function formatPercent(value: number, market: MarketType = 'bist'): string {
  return new Intl.NumberFormat(localeFor(market), {
    style: 'percent',
    minimumFractionDigits: 2,
    maximumFractionDigits: 2,
  }).format(value / 100)
}

export function formatNumber(value: number, market: MarketType = 'bist'): string {
  return new Intl.NumberFormat(localeFor(market)).format(value)
}

export function formatDate(date: string | Date, market: MarketType = 'bist'): string {
  const dateObj = typeof date === 'string' ? new Date(date) : date
  return dateObj.toLocaleDateString(localeFor(market), {
    day: '2-digit',
    month: '2-digit',
    year: 'numeric',
  })
}