import { describe, it, expect } from 'bun:test'
import { TaxService } from '../../src/services/tax.service.js'

describe('TaxService.calculateTax', () => {
  it('calculates tax on a simple amount', () => {
    // 8.25% on $100
    expect(TaxService.calculateTax(100, 0.0825)).toBe(8.25)
  })

  it('rounds to 2 decimal places', () => {
    // 8.25% on $10.01 = 0.825825 → 0.83
    expect(TaxService.calculateTax(10.01, 0.0825)).toBe(0.83)
  })

  it('returns 0 for zero rate', () => {
    expect(TaxService.calculateTax(100, 0)).toBe(0)
  })

  it('returns 0 for zero amount', () => {
    expect(TaxService.calculateTax(0, 0.0825)).toBe(0)
  })

  it('handles small amounts', () => {
    // 8.25% on $0.99 = 0.081675 → 0.08
    expect(TaxService.calculateTax(0.99, 0.0825)).toBe(0.08)
  })

  it('handles large amounts', () => {
    // 8.25% on $9999.99 = 824.999175 → 825.00
    expect(TaxService.calculateTax(9999.99, 0.0825)).toBe(825)
  })

  it('handles 5% service tax rate', () => {
    // 5% on $60 = 3.00
    expect(TaxService.calculateTax(60, 0.05)).toBe(3)
  })

  it('handles fractional cent rounding down', () => {
    // 7% on $1.01 = 0.0707 → 0.07
    expect(TaxService.calculateTax(1.01, 0.07)).toBe(0.07)
  })

  it('handles fractional cent rounding up', () => {
    // 7% on $1.05 = 0.0735 → 0.07
    expect(TaxService.calculateTax(1.05, 0.07)).toBe(0.07)
  })
})

describe('TaxService.roundToNickel', () => {
  it('rounds .01 down to .00', () => {
    expect(TaxService.roundToNickel(10.01)).toBe(10.00)
  })

  it('rounds .02 down to .00', () => {
    expect(TaxService.roundToNickel(10.02)).toBe(10.00)
  })

  it('rounds .03 up to .05', () => {
    expect(TaxService.roundToNickel(10.03)).toBe(10.05)
  })

  it('rounds .04 up to .05', () => {
    expect(TaxService.roundToNickel(10.04)).toBe(10.05)
  })

  it('keeps .05 as is', () => {
    expect(TaxService.roundToNickel(10.05)).toBe(10.05)
  })

  it('rounds .06 down to .05', () => {
    expect(TaxService.roundToNickel(10.06)).toBe(10.05)
  })

  it('rounds .07 down to .05', () => {
    expect(TaxService.roundToNickel(10.07)).toBe(10.05)
  })

  it('rounds .08 up to .10', () => {
    expect(TaxService.roundToNickel(10.08)).toBe(10.10)
  })

  it('rounds .09 up to .10', () => {
    expect(TaxService.roundToNickel(10.09)).toBe(10.10)
  })

  it('keeps .00 as is', () => {
    expect(TaxService.roundToNickel(10.00)).toBe(10.00)
  })

  it('keeps .10 as is', () => {
    expect(TaxService.roundToNickel(10.10)).toBe(10.10)
  })

  it('handles zero', () => {
    expect(TaxService.roundToNickel(0)).toBe(0)
  })
})

describe('TaxService.repairItemTypeToTaxCategory', () => {
  it('maps labor to service', () => {
    expect(TaxService.repairItemTypeToTaxCategory('labor')).toBe('service')
  })

  it('maps part to goods', () => {
    expect(TaxService.repairItemTypeToTaxCategory('part')).toBe('goods')
  })

  it('maps flat_rate to goods', () => {
    expect(TaxService.repairItemTypeToTaxCategory('flat_rate')).toBe('goods')
  })

  it('maps misc to goods', () => {
    expect(TaxService.repairItemTypeToTaxCategory('misc')).toBe('goods')
  })

  it('maps unknown type to goods (default)', () => {
    expect(TaxService.repairItemTypeToTaxCategory('something_else')).toBe('goods')
  })
})