import { formatUnits } from "viem"
import { normalizePrecision } from "./numbers"

/**
 * Formats a number as a currency
 * @param value The value to format
 * @param options The options to pass to the formatter
 * @returns The formatted currency
 */
export function formatCurrency(
  value: number,
  options: Omit<Intl.NumberFormatOptions, "style">,
): string {
  const formatter = new Intl.NumberFormat("en-US", {
    style: "currency",
    minimumFractionDigits: 2,
    maximumFractionDigits: 2,
    ...options,
  })

  return formatter.format(value)
}

/**
 * Formats a number as a USD currency
 * @param value The value to format
 * @returns The formatted currency
 */
export function formatUsd(value: number | string): string {
  return formatCurrency(Number(value), { currency: "USD" })
}

/**
 * Converts an asset amount to USD based on a conversion rate and decimals
 * @param assetAmount - The amount of the asset in its smallest unit (e.g., satoshis for BTC)
 * @param conversionRate - The conversion rate from the asset to USD in fixed-point format
 * @param decimals - The number of decimals for the asset
 * @returns - The value in USD as a number
 */
export function convertToUsd(
  assetAmount: bigint,
  assetDecimals: number,
  conversionRate: bigint,
  conversionRateDecimals: number,
) {
  const value = normalizePrecision(
    assetAmount * conversionRate,
    assetDecimals + conversionRateDecimals,
    conversionRateDecimals,
  )

  const formatted = formatUnits(value, conversionRateDecimals)

  return {
    value,
    formatted,
  }
}