import { describe, it, expect } from 'vitest'
import { getConversionFactor, calculateTotals } from '@/units'

describe('units', () => {
  it('returns conversion factors for aliases and base units', () => {
    expect(getConversionFactor('kg')).toEqual({ unit: 'kg', factor: 1 })
    expect(getConversionFactor('g')).toEqual({ unit: 'kg', factor: 1000 })
    expect(getConversionFactor('kgs')).toEqual({ unit: 'kg', factor: 1 })
    expect(getConversionFactor('litre')).toEqual({ unit: 'litres', factor: 1 })
    expect(getConversionFactor('ml')).toEqual({ unit: 'litres', factor: 1000 })
  })

  it('calculates totals grouped by base units', () => {
    const totals = calculateTotals([
      { quantity: 500, unit: 'g' },
      { quantity: 0.5, unit: 'kg' },
      { quantity: 250, unit: 'ml' },
      { quantity: 0.75, unit: 'litre' },
    ])
    // Expect kg total = 0.5 (from g) + 0.5 (from kg) = 1
    const kgTotal = totals.find((t) => t.unit === 'kg')
    expect(kgTotal.quantity).toBeCloseTo(1)
    // Expect litres total = 0.25 (from ml) + 0.75 (from litre) = 1
    const lTotal = totals.find((t) => t.unit === 'litres')
    expect(lTotal.quantity).toBeCloseTo(1)
  })
})