import { describe, it, expect } from 'vitest'
import { formatRelativeTime } from '../useRelativeTime'

describe('formatRelativeTime', () => {
  const now = new Date('2026-06-15T12:00:00Z')

  it('formats seconds ago', () => {
    const result = formatRelativeTime('2026-06-15T11:59:30Z', now)
    expect(result).toMatch(/30 seconds ago/)
  })

  it('formats minutes ago', () => {
    const result = formatRelativeTime('2026-06-15T11:55:00Z', now)
    expect(result).toMatch(/5 minutes ago/)
  })

  it('formats hours ago', () => {
    const result = formatRelativeTime('2026-06-15T09:00:00Z', now)
    expect(result).toMatch(/3 hours ago/)
  })

  it('formats days ago', () => {
    const result = formatRelativeTime('2026-06-13T12:00:00Z', now)
    expect(result).toMatch(/2 days ago/)
  })

  it('formats weeks ago', () => {
    const result = formatRelativeTime('2026-06-01T12:00:00Z', now)
    expect(result).toMatch(/2 weeks ago/)
  })

  it('formats months ago', () => {
    const result = formatRelativeTime('2026-03-15T12:00:00Z', now)
    expect(result).toMatch(/3 months ago/)
  })

  it('formats years ago', () => {
    const result = formatRelativeTime('2024-06-15T12:00:00Z', now)
    expect(result).toMatch(/2 years ago/)
  })

  it('formats future seconds', () => {
    const result = formatRelativeTime('2026-06-15T12:00:30Z', now)
    expect(result).toMatch(/in 30 seconds/)
  })

  it('formats future days', () => {
    const result = formatRelativeTime('2026-06-18T12:00:00Z', now)
    expect(result).toMatch(/in 3 days/)
  })

  it('formats future months', () => {
    const result = formatRelativeTime('2026-09-15T12:00:00Z', now)
    expect(result).toMatch(/in 3 months/)
  })

  it('formats "now" for zero difference', () => {
    const result = formatRelativeTime('2026-06-15T12:00:00Z', now)
    // Intl.RelativeTimeFormat with numeric: 'auto' returns "now" for 0 seconds
    expect(result).toMatch(/now/)
  })

  it('formats yesterday', () => {
    const result = formatRelativeTime('2026-06-14T12:00:00Z', now)
    expect(result).toMatch(/yesterday|1 day ago/)
  })

  it('formats tomorrow', () => {
    const result = formatRelativeTime('2026-06-16T12:00:00Z', now)
    expect(result).toMatch(/tomorrow|in 1 day/)
  })
})