import { describe, expect, it } from 'vitest'
import {
  gutenbergCoverCandidateUrls,
  gutenbergCoverImageUrl,
  gutenbergEbookPageUrl,
  gutenbergLibraryCoverImageUrl,
  normalizeGutenbergCoverImageUrl,
  parseGutenbergEbookId,
  parseGutenbergEbookIdFromDTag,
  resolveGutenbergCoverImageUrl
} from '@/lib/gutenberg-cover'

describe('gutenberg-cover', () => {
  it('parses ebook id from gutenberg.org URLs', () => {
    expect(parseGutenbergEbookId('https://www.gutenberg.org/ebooks/58363')).toBe('58363')
    expect(parseGutenbergEbookId('https://www.gutenberg.org/ebooks/58363/')).toBe('58363')
    expect(parseGutenbergEbookId('https://www.gutenberg.org/files/21020/21020-h/21020-h.htm')).toBe(
      '21020'
    )
    expect(
      parseGutenbergEbookId('https://www.gutenberg.org/cache/epub/16702/pg16702.cover.medium.jpg')
    ).toBe('16702')
  })

  it('parses ebook id from pg-prefixed cover filenames on third-party hosts', () => {
    expect(
      parseGutenbergEbookId(
        'https://api.nostr.build/v2/upload/67104/p/33358/pg33358.cover.medium.jpg'
      )
    ).toBe('33358')
    expect(parseGutenbergEbookId('https://cdn.example.com/pg292405.jpg')).toBe('292405')
  })

  it('builds medium cover URL by default', () => {
    expect(gutenbergCoverImageUrl('58363')).toBe(
      'https://www.gutenberg.org/cache/epub/58363/pg58363.cover.medium.jpg'
    )
    expect(gutenbergCoverImageUrl('58363', 'small')).toBe(
      'https://www.gutenberg.org/cache/epub/58363/pg58363.cover.small.jpg'
    )
  })

  it('gutenbergLibraryCoverImageUrl prefers small covers for library grids', () => {
    expect(
      gutenbergLibraryCoverImageUrl(
        'https://www.gutenberg.org/cache/epub/58363/pg58363.cover.medium.jpg'
      )
    ).toBe('https://www.gutenberg.org/cache/epub/58363/pg58363.cover.small.jpg')
    expect(gutenbergLibraryCoverImageUrl('https://example.com/cover.jpg')).toBe(
      'https://example.com/cover.jpg'
    )
  })

  it('resolveGutenbergCoverImageUrl requires gutenberg source', () => {
    expect(
      resolveGutenbergCoverImageUrl('https://www.gutenberg.org/ebooks/58363')
    ).toBe('https://www.gutenberg.org/cache/epub/58363/pg58363.cover.medium.jpg')
    expect(resolveGutenbergCoverImageUrl('https://example.com/book')).toBeUndefined()
  })

  it('parses ebook id from legacy pg-prefixed d-tags', () => {
    expect(parseGutenbergEbookIdFromDTag('pg28217-dante-et-goethe-dialogues')).toBe('28217')
    expect(parseGutenbergEbookIdFromDTag('pg28217')).toBe('28217')
    expect(parseGutenbergEbookIdFromDTag('jane-eyre')).toBeNull()
  })

  it('builds gutenberg.org ebook page URL', () => {
    expect(gutenbergEbookPageUrl('28217')).toBe('https://www.gutenberg.org/ebooks/28217')
  })

  it('gutenbergCoverCandidateUrls tries medium first, then small in library mode', () => {
    expect(
      gutenbergCoverCandidateUrls(
        'https://www.gutenberg.org/cache/epub/11/pg11.cover.medium.jpg',
        true
      )
    ).toEqual([
      'https://www.gutenberg.org/cache/epub/11/pg11.cover.medium.jpg',
      'https://www.gutenberg.org/cache/epub/11/pg11.cover.small.jpg'
    ])
    expect(
      gutenbergCoverCandidateUrls(
        'https://www.gutenberg.org/cache/epub/11/pg11.cover.medium.jpg',
        false
      )
    ).toEqual(['https://www.gutenberg.org/cache/epub/11/pg11.cover.medium.jpg'])
    expect(gutenbergCoverCandidateUrls('https://example.com/cover.jpg', true)).toEqual([
      'https://example.com/cover.jpg'
    ])
  })

  it('gutenbergCoverCandidateUrls falls back to gutenberg.org for PG mirror URLs', () => {
    expect(
      gutenbergCoverCandidateUrls(
        'https://api.nostr.build/v2/upload/67104/p/33358/pg33358.cover.medium.jpg',
        true
      )
    ).toEqual([
      'https://api.nostr.build/v2/upload/67104/p/33358/pg33358.cover.medium.jpg',
      'https://www.gutenberg.org/cache/epub/33358/pg33358.cover.medium.jpg',
      'https://www.gutenberg.org/cache/epub/33358/pg33358.cover.small.jpg'
    ])
  })

  it('normalizeGutenbergCoverImageUrl rewrites PG mirror filenames to gutenberg.org', () => {
    expect(
      normalizeGutenbergCoverImageUrl(
        'https://api.nostr.build/v2/upload/67104/p/33358/pg33358.cover.medium.jpg'
      )
    ).toBe('https://www.gutenberg.org/cache/epub/33358/pg33358.cover.medium.jpg')
  })

  it('normalizeGutenbergCoverImageUrl converts ebook pages to cover JPG', () => {
    expect(normalizeGutenbergCoverImageUrl('https://www.gutenberg.org/ebooks/16702')).toBe(
      'https://www.gutenberg.org/cache/epub/16702/pg16702.cover.medium.jpg'
    )
    expect(
      normalizeGutenbergCoverImageUrl(
        'https://www.gutenberg.org/cache/epub/16702/pg16702.cover.medium.jpg'
      )
    ).toBe('https://www.gutenberg.org/cache/epub/16702/pg16702.cover.medium.jpg')
    expect(normalizeGutenbergCoverImageUrl('https://example.com/cover.jpg')).toBe(
      'https://example.com/cover.jpg'
    )
  })
})