import {
  createNotFoundPageData,
  isRelativeBase,
  joinPath,
  mergeHead,
  relativePathToRoot,
  resolveNotFoundPage,
  type HeadConfig,
  type SiteData
} from 'shared/shared'

describe('shared/shared', () => {
  describe('resolveNotFoundPage', () => {
    const site = {
      locales: {
        root: { label: 'English', lang: 'en' },
        zh: { label: '中文', lang: 'zh-CN' },
        'fr-FR': { label: 'Français', lang: 'fr-FR' },
        'https://example.com/': { label: 'External' }
      }
    } as unknown as SiteData

    test('picks the not-found page of the path locale', () => {
      expect(resolveNotFoundPage(site, 'zh/guide/missing.md')).toBe('zh/404.md')
      expect(resolveNotFoundPage(site, 'zh/guide/missing')).toBe('zh/404.md')
      expect(resolveNotFoundPage(site, 'zh/')).toBe('zh/404.md')
      expect(resolveNotFoundPage(site, 'fr-FR/missing')).toBe('fr-FR/404.md')
    })

    test('falls back to the root page', () => {
      expect(resolveNotFoundPage(site, 'guide/missing.md')).toBe('404.md')
      expect(resolveNotFoundPage(site, '')).toBe('404.md')
      // a page named after the locale is not inside the locale directory
      expect(resolveNotFoundPage(site, 'zh')).toBe('404.md')
      // locale keys that are links to other sites never match
      expect(resolveNotFoundPage(site, 'https://example.com/x')).toBe('404.md')
    })

    test('has only the root page without locales', () => {
      expect(resolveNotFoundPage({} as SiteData, 'zh/missing')).toBe('404.md')
      expect(resolveNotFoundPage(undefined, 'zh/missing')).toBe('404.md')
    })
  })

  describe('createNotFoundPageData', () => {
    test('is a virtual page of the given path', () => {
      expect(createNotFoundPageData('zh/404.md')).toEqual({
        relativePath: 'zh/404.md',
        filePath: '',
        title: '404',
        description: 'Not Found',
        headers: [],
        frontmatter: {},
        isNotFound: true
      })
    })
  })

  describe('mergeHead', () => {
    test('replaces meta tags with the same key in place', () => {
      expect(
        mergeHead(
          [
            ['meta', { property: 'og:image', content: '/site.png' }],
            ['meta', { name: 'keywords', content: 'site' }]
          ],
          [['meta', { content: '/page.png', property: 'og:image' }]]
        )
      ).toEqual([
        ['meta', { content: '/page.png', property: 'og:image' }],
        ['meta', { name: 'keywords', content: 'site' }]
      ])
    })

    test('ignores content when keying meta tags', () => {
      const head: HeadConfig[] = [
        ['meta', { content: 'a', name: 'name1' }],
        ['meta', { content: 'a', name: 'name2' }]
      ]
      expect(mergeHead(head)).toEqual(head)
    })

    test('keys any element by id regardless of attribute order', () => {
      expect(
        mergeHead(
          [
            ['meta', { name: 'author', content: 'a', id: 'author-a' }],
            ['meta', { name: 'author', content: 'b', id: 'author-b' }],
            ['script', { id: 'sw' }, 'old']
          ],
          [
            ['meta', { id: 'author-a', name: 'author', content: 'c' }],
            ['script', { id: 'sw' }, 'new']
          ]
        )
      ).toEqual([
        ['meta', { id: 'author-a', name: 'author', content: 'c' }],
        ['meta', { name: 'author', content: 'b', id: 'author-b' }],
        ['script', { id: 'sw' }, 'new']
      ])
    })

    test('appends elements without a key', () => {
      const head: HeadConfig[] = [
        ['link', { rel: 'stylesheet', href: '/a.css' }],
        ['link', { rel: 'stylesheet', href: '/a.css' }]
      ]
      expect(mergeHead(head, head)).toEqual([...head, ...head])
    })
  })
})

describe('shared/shared url helpers', () => {
  describe('joinPath', () => {
    test('joins and collapses slash collisions', () => {
      expect(joinPath('/', '/guide/')).toBe('/guide/')
      expect(joinPath('/docs/', '/guide/page')).toBe('/docs/guide/page')
      expect(joinPath('/docs', 'guide')).toBe('/docsguide')
    })

    test('preserves the protocol of absolute url bases', () => {
      expect(joinPath('https://cdn.example.com/', '/guide/')).toBe(
        'https://cdn.example.com/guide/'
      )
      expect(joinPath('https://cdn.example.com/sub//x/', '/a')).toBe(
        'https://cdn.example.com/sub/x/a'
      )
      expect(joinPath('//cdn.example.com/', '/a')).toBe('//cdn.example.com/a')
    })
  })

  describe('isRelativeBase', () => {
    test('only ./ is relative', () => {
      expect(isRelativeBase('./')).toBe(true)
      expect(isRelativeBase('/')).toBe(false)
      expect(isRelativeBase('/docs/')).toBe(false)
      expect(isRelativeBase('https://example.com/')).toBe(false)
    })
  })

  describe('relativePathToRoot', () => {
    test('maps a page path to its ../-prefix', () => {
      expect(relativePathToRoot('index.md')).toBe('./')
      expect(relativePathToRoot('foo.md')).toBe('./')
      expect(relativePathToRoot('guide/index.md')).toBe('../')
      expect(relativePathToRoot('guide/nested/page.md')).toBe('../../')
    })
  })
})