import type { MetadataRoute } from 'next'
import { getPayloadClient } from '@/lib/payload'
import { buildAbsoluteUrl } from '@/lib/seo'
import type { Locale } from '@/i18n/config'

export const dynamic = 'force-dynamic'

const LOCALES: Locale[] = ['en', 'zh']
const STATIC_PATHS = ['', '/products', '/support', '/support/faq', '/support/warranty', '/support/contact', '/downloads', '/about', '/dealers', '/news']

export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
  const payload = await getPayloadClient()

  const [productsEn, productsZh, newsEn, newsZh] = await Promise.all([
    payload.find({
      collection: 'products',
      depth: 0,
      limit: 100,
      locale: 'en',
      where: { docLocale: { equals: 'en' } },
    }),
    payload.find({
      collection: 'products',
      depth: 0,
      limit: 100,
      locale: 'zh',
      where: { docLocale: { equals: 'zh' } },
    }),
    payload.find({
      collection: 'news',
      depth: 0,
      limit: 200,
      locale: 'en',
      where: { docLocale: { equals: 'en' } },
    }),
    payload.find({
      collection: 'news',
      depth: 0,
      limit: 200,
      locale: 'zh',
      where: { docLocale: { equals: 'zh' } },
    }),
  ])

  const entries: MetadataRoute.Sitemap = []

  for (const locale of LOCALES) {
    for (const path of STATIC_PATHS) {
      entries.push({
        changeFrequency: path === '' ? 'weekly' : 'monthly',
        lastModified: new Date(),
        priority: path === '' ? 1 : 0.7,
        url: buildAbsoluteUrl(`/${locale}${path}`),
      })
    }
  }

  for (const product of productsEn.docs) {
    if (product.slug) {
      entries.push({
        changeFrequency: 'weekly',
        lastModified: product.updatedAt || new Date(),
        priority: 0.8,
        url: buildAbsoluteUrl(`/en/products/${product.slug}`),
      })
    }
  }

  for (const product of productsZh.docs) {
    if (product.slug) {
      entries.push({
        changeFrequency: 'weekly',
        lastModified: product.updatedAt || new Date(),
        priority: 0.8,
        url: buildAbsoluteUrl(`/zh/products/${product.slug}`),
      })
    }
  }

  for (const article of newsEn.docs) {
    if (article.slug) {
      entries.push({
        changeFrequency: 'monthly',
        lastModified: article.updatedAt || article.publishedAt || new Date(),
        priority: 0.65,
        url: buildAbsoluteUrl(`/en/news/${article.slug}`),
      })
    }
  }

  for (const article of newsZh.docs) {
    if (article.slug) {
      entries.push({
        changeFrequency: 'monthly',
        lastModified: article.updatedAt || article.publishedAt || new Date(),
        priority: 0.65,
        url: buildAbsoluteUrl(`/zh/news/${article.slug}`),
      })
    }
  }

  return entries
}