import { describe, expect, test } from 'bun:test'
import { buildPublicCanonicalUrl } from './public-canonical-url'

describe('buildPublicCanonicalUrl', () => {
  test('builds canonical with full path', () => {
    expect(buildPublicCanonicalUrl('https://example.com', '/@alice/posts?page=2')).toBe('https://example.com/@alice/posts?page=2')
  })

  test('drops hash fragment', () => {
    expect(buildPublicCanonicalUrl('https://example.com', '/@alice/reading#section')).toBe('https://example.com/@alice/reading')
  })

  test('removes page=1 from canonical', () => {
    expect(buildPublicCanonicalUrl('https://example.com', '/@alice/timeline?page=1')).toBe('https://example.com/@alice/timeline')
  })

  test('removes page=1 equivalent query forms from canonical', () => {
    expect(buildPublicCanonicalUrl('https://example.com', '/@alice/timeline?page=01')).toBe('https://example.com/@alice/timeline')
    expect(buildPublicCanonicalUrl('https://example.com', '/@alice/timeline?page=%2B1')).toBe('https://example.com/@alice/timeline')
    expect(buildPublicCanonicalUrl('https://example.com', '/@alice/timeline?foo=bar&page=1.0')).toBe('https://example.com/@alice/timeline?foo=bar')
    expect(buildPublicCanonicalUrl('https://example.com', '/@alice/timeline?page=1&page=001')).toBe('https://example.com/@alice/timeline')
  })

  test('keeps non-first-page values', () => {
    expect(buildPublicCanonicalUrl('https://example.com', '/@alice/timeline?page=2')).toBe('https://example.com/@alice/timeline?page=2')
    expect(buildPublicCanonicalUrl('https://example.com', '/@alice/timeline?page=1&page=2')).toBe('https://example.com/@alice/timeline?page=1&page=2')
  })

  test('returns null when siteUrl is invalid', () => {
    expect(buildPublicCanonicalUrl('not-a-url', '/@alice')).toBeNull()
  })
})