import dayjs from 'dayjs'
import {
  formatFileSize,
  formatNumber,
  formatNumberAbbreviated,
  formatTime,
  formatToLocalTime,
} from './format'

describe('formatNumber', () => {
  it.each([
    [1234567, '1,234,567'],
    [-1234567.89, '-1,234,567.89'],
    ['8E-7', '0.0000008'],
    [1.23e-7, '0.000000123'],
  ])('formats %s without losing precision', (input, expected) => {
    expect(formatNumber(input)).toBe(expected)
  })
})

describe('formatFileSize', () => {
  it.each([
    [500, '500.00 bytes'],
    [1024, '1.00 KB'],
    [1500000, '1.43 MB'],
    [1500000000, '1.40 GB'],
  ])('formats %s bytes as %s', (input, expected) => {
    expect(formatFileSize(input)).toBe(expected)
  })
  it('should clamp to PB instead of an undefined unit for very large sizes', () => {
    expect(formatFileSize(1024 ** 6)).toBe('1024.00 PB')
  })
})

describe('formatTime', () => {
  it.each([
    [30, '30.00 sec'],
    [60, '1.00 min'],
    [3600, '1.00 h'],
  ])('formats %s seconds as %s', (input, expected) => {
    expect(formatTime(input)).toBe(expected)
  })
  it('should clamp to hours instead of an undefined unit for very large durations', () => {
    expect(formatTime(216000)).toBe('60.00 h')
  })
})

describe('formatNumberAbbreviated', () => {
  it.each([
    [999, '999'],
    [1200, '1.2k'],
    [1500000, '1.5M'],
    [2300000000, '2.3B'],
  ])('abbreviates %s as %s', (input, expected) => {
    expect(formatNumberAbbreviated(input)).toBe(expected)
  })
})

describe('formatToLocalTime', () => {
  it.each([
    ['ar-TN', 'يناير'],
    ['lo-LA', 'ມັງກອນ'],
    ['en-US', 'January'],
  ] as const)('formats month names in %s', (locale, expectedMonth) => {
    expect(formatToLocalTime(dayjs('2026-01-15'), locale, 'MMMM')).toBe(expectedMonth)
  })
})