import { convertToUsd, formatCurrency, formatUsd } from "./currency"

describe("formatCurrency", () => {
  it("formats a number as currency with default options", () => {
    const result = formatCurrency(1234.5, { currency: "EUR" })
    expect(result).toBe("€1,234.50")
  })

  it("respects minimumFractionDigits (min = 3, max = 3)", () => {
    const result = formatCurrency(1.2, {
      currency: "USD",
      minimumFractionDigits: 3,
      maximumFractionDigits: 3,
    })
    expect(result).toBe("$1.200")
  })

  it("respects maximumFractionDigits (min = 0, max = 1)", () => {
    const result = formatCurrency(1.234567, {
      currency: "USD",
      minimumFractionDigits: 0,
      maximumFractionDigits: 1,
    })
    expect(result).toBe("$1.2")
  })
})

describe("formatUsd", () => {
  it("formats a number as USD", () => {
    const result = formatUsd(99.99)
    expect(result).toBe("$99.99")
  })

  it("formats zero", () => {
    const result = formatUsd(0)
    expect(result).toBe("$0.00")
  })
})

describe("convertToUsd", () => {
  it("converts 1 BTC (8 decimals) with $30,000 rate (6 decimals)", () => {
    const assetAmount = 1_00000000n // 1 BTC
    const assetDecimals = 8
    const conversionRate = 30_000_000000n // $30,000 in 6 decimals
    const conversionRateDecimals = 6

    const result = convertToUsd(
      assetAmount,
      assetDecimals,
      conversionRate,
      conversionRateDecimals,
    )

    expect(result.value).toBe(30_000_000000n)
    expect(result.formatted).toBe("30000")
  })

  it("converts 0.5 BTC correctly", () => {
    const assetAmount = 50_000000n // 0.5 BTC
    const assetDecimals = 8
    const conversionRate = 40_000_000000n // $40,000
    const conversionRateDecimals = 6

    const result = convertToUsd(
      assetAmount,
      assetDecimals,
      conversionRate,
      conversionRateDecimals,
    )

    expect(result.value).toBe(20_000_000000n)
    expect(result.formatted).toBe("20000")
  })

  it("converts 1 ETH (18 decimals) with $2,000 rate (6 decimals)", () => {
    const assetAmount = 1_000000000000000000n // 1 ETH
    const assetDecimals = 18
    const conversionRate = 2_000_000000n
    const conversionRateDecimals = 6

    const result = convertToUsd(
      assetAmount,
      assetDecimals,
      conversionRate,
      conversionRateDecimals,
    )

    expect(result.value).toBe(2_000_000000n)
    expect(result.formatted).toBe("2000")
  })

  it("handles zero amount correctly", () => {
    const result = convertToUsd(0n, 18, 999_999999n, 6)
    expect(result.value).toBe(0n)
    expect(result.formatted).toBe("0")
  })

  it("handles assets with fewer decimals than conversion rate", () => {
    const assetAmount = 100n
    const assetDecimals = 2
    const conversionRate = 1_500_000000n // $1500
    const conversionRateDecimals = 6

    const result = convertToUsd(
      assetAmount,
      assetDecimals,
      conversionRate,
      conversionRateDecimals,
    )

    expect(result.value).toBe(1_500_000000n)
    expect(result.formatted).toBe("1500")
  })
})