import { MetadataRoute } from 'next'
import { prisma } from '@/lib/db'

export const dynamic = 'force-dynamic'
export const revalidate = 86400 // Revalidate once per day

const BASE_URL = 'https://biblical-guide.com'
const LOCALES = ['en', 'ro', 'es', 'it']

// Map locales to Bible version languages
const LOCALE_TO_LANGUAGE: Record<string, string> = {
  'en': 'en',
  'ro': 'ro',
  'es': 'es',
  'it': 'it'
}

// Prioritized versions for each language (to limit sitemap size)
const PRIORITY_VERSIONS: Record<string, string[]> = {
  'en': ['ENG-ASV', 'ENG-KJV', 'ENG-WEB', 'ENGKJVCPB', 'ENGEMTV'],
  'ro': ['ROO', 'RONDCV', 'ROCOR'],
  'es': ['SPAV1602P', 'SPABES', 'SPARVG', 'SPAPDDPT'],
  'it': ['ITNRV', 'ITPRV', 'ITCEI']
}

export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
  const urls: MetadataRoute.Sitemap = []

  // Static pages for each locale
  const staticPages = [
    { path: '', priority: 1.0, changeFrequency: 'daily' as const },
    { path: '/bible', priority: 0.9, changeFrequency: 'weekly' as const },
    { path: '/prayers', priority: 0.8, changeFrequency: 'daily' as const },
    { path: '/search', priority: 0.7, changeFrequency: 'weekly' as const },
    { path: '/contact', priority: 0.6, changeFrequency: 'monthly' as const },
    { path: '/donate', priority: 0.7, changeFrequency: 'monthly' as const },
    { path: '/subscription', priority: 0.8, changeFrequency: 'weekly' as const },
    { path: '/reading-plans', priority: 0.7, changeFrequency: 'weekly' as const },
    { path: '/bookmarks', priority: 0.6, changeFrequency: 'weekly' as const },
    { path: '/settings', priority: 0.5, changeFrequency: 'monthly' as const },
    { path: '/profile', priority: 0.5, changeFrequency: 'monthly' as const },
    { path: '/login', priority: 0.5, changeFrequency: 'monthly' as const },
    { path: '/auth/login', priority: 0.5, changeFrequency: 'monthly' as const },
  ]

  // Add static pages for all locales
  for (const locale of LOCALES) {
    for (const page of staticPages) {
      urls.push({
        url: `${BASE_URL}/${locale}${page.path}`,
        lastModified: new Date(),
        changeFrequency: page.changeFrequency,
        priority: page.priority,
      })
    }
  }

  try {
    // Get priority Bible versions for each language
    for (const locale of LOCALES) {
      const language = LOCALE_TO_LANGUAGE[locale]
      const priorityAbbreviations = PRIORITY_VERSIONS[language] || []

      // Get versions for this language (prioritize specific versions, then default, then by language)
      const versions = await prisma.bibleVersion.findMany({
        where: {
          OR: [
            { abbreviation: { in: priorityAbbreviations } },
            { language: language, isDefault: true },
            { language: language }
          ]
        },
        select: {
          id: true,
          abbreviation: true,
          isDefault: true,
        },
        take: 10, // Limit to top 10 versions per language
        orderBy: [
          { isDefault: 'desc' },
          { abbreviation: 'asc' }
        ]
      })

      console.log(`[Sitemap] Locale ${locale}: Found ${versions.length} relevant Bible versions`)

      // For each version, get all books and chapters
      for (const version of versions) {
        const books = await prisma.bibleBook.findMany({
          where: { versionId: version.id },
          select: {
            id: true,
            bookKey: true,
          },
          orderBy: { orderNum: 'asc' },
        })

        // Add URLs for each book and chapter
        for (const book of books) {
          const bookSlug = book.bookKey.toLowerCase()
          const versionSlug = version.abbreviation.toLowerCase()

          // Get chapters for this book
          const chapters = await prisma.bibleChapter.findMany({
            where: { bookId: book.id },
            select: { chapterNum: true },
            orderBy: { chapterNum: 'asc' },
          })

          // Add URL for each chapter (only for this locale to avoid duplicates)
          for (const chapter of chapters) {
            urls.push({
              url: `${BASE_URL}/${locale}/bible/${versionSlug}/${bookSlug}/${chapter.chapterNum}`,
              lastModified: new Date(),
              changeFrequency: 'monthly',
              priority: version.isDefault ? 0.7 : 0.6,
            })
          }
        }
      }
    }

    console.log(`[Sitemap] Generated ${urls.length} total URLs`)
  } catch (error) {
    console.error('[Sitemap] Error generating Bible URLs:', error)
  }

  return urls
}