import { existsSync } from 'node:fs'
import { join } from 'node:path'

import { describe, expect, it } from 'vitest'

import { aboutPage } from '@/content/aboutPage'
import { contactPage } from '@/content/publicPages'
import { FAQ_PAGE_SEO } from '@/lib/seo/faqPage'
import { HOST_GUIDE_SEO } from '@/lib/seo/hostGuidePage'
import { LEGAL_PAGE_SEO } from '@/lib/seo/legalPages'
import { buildCanonicalUrl, DEFAULT_OG_IMAGE_PATH, resolveOgImage, SITE_URL } from '@/lib/seo/metadata'
import { buildPublicPageMetadata } from '@/lib/seo/publicPageMetadata'

const TITLE_SUFFIX = ' | قبیله'

describe('SEO metadata policy', () => {
  it('uses the production canonical origin without a trailing slash', () => {
    expect(SITE_URL).toBe('https://ghabilee.ir')
    expect(buildCanonicalUrl('/city/mashhad')).toBe('https://ghabilee.ir/city/mashhad')
    expect(buildCanonicalUrl('category/art')).toBe('https://ghabilee.ir/category/art')
  })

  it('ships the default Open Graph image referenced by metadata', () => {
    expect(DEFAULT_OG_IMAGE_PATH).toBe('/og-default.jpg')
    expect(resolveOgImage()).toBe('https://ghabilee.ir/og-default.jpg')
    expect(existsSync(join(process.cwd(), 'public', DEFAULT_OG_IMAGE_PATH))).toBe(true)
  })

  it('prefers a page-specific Open Graph image', () => {
    expect(resolveOgImage('', null, 'https://cdn.example.com/category.png')).toBe('https://cdn.example.com/category.png')
  })

  it('keeps public static page titles and descriptions in SERP bounds', () => {
    const legalPages = Object.values(LEGAL_PAGE_SEO)
    const absoluteTitlePages = [aboutPage, FAQ_PAGE_SEO, HOST_GUIDE_SEO, ...legalPages]
    const pages = [...absoluteTitlePages, contactPage]

    for (const page of pages) {
      const isAbsoluteTitlePage = absoluteTitlePages.includes(page as (typeof absoluteTitlePages)[number])

      if (isAbsoluteTitlePage) {
        expect(page.metaTitle.length).toBeLessThanOrEqual(60)
      } else {
        expect(page.metaTitle.length + TITLE_SUFFIX.length).toBeLessThanOrEqual(60)
      }
      expect(page.metaDescription.length).toBeGreaterThanOrEqual(70)
      expect(page.metaDescription.length).toBeLessThanOrEqual(160)
    }
  })

  it('builds absolute Open Graph URLs for public static pages', () => {
    const metadata = buildPublicPageMetadata({
      path: '/faq',
      metaTitle: 'سؤالات متداول رزرو و میزبانی رویداد',
      metaDescription: 'پاسخ سؤالات متداول درباره رزرو رویداد، پرداخت، لغو رزرو، بازگشت وجه و میزبانی در قبیله را اینجا بخوانید.',
    })

    expect(metadata.alternates).toMatchObject({ canonical: '/faq' })
    expect(metadata.openGraph).toMatchObject({
      url: 'https://ghabilee.ir/faq',
      locale: 'fa_IR',
      type: 'website',
    })
    expect(metadata.twitter).toMatchObject({ card: 'summary_large_image' })
  })

  it('makes relative public-page Open Graph images absolute', () => {
    const metadata = buildPublicPageMetadata({
      path: '/terms',
      metaTitle: LEGAL_PAGE_SEO.terms.metaTitle,
      metaDescription: LEGAL_PAGE_SEO.terms.metaDescription,
      ogImage: '/images/public/terms-hero.avif',
    })

    expect(metadata.openGraph?.images).toEqual([
      {
        url: 'https://ghabilee.ir/images/public/terms-hero.avif',
        alt: LEGAL_PAGE_SEO.terms.metaTitle,
      },
    ])
  })
})