import type { MetadataRoute } from 'next'
import { client } from '@/shared/lib/sanity'
import { POST_SLUGS_QUERY, EVENT_SLUGS_QUERY, CATEGORIES_QUERY } from '@/shared/lib/sanity'
import { siteConfig } from '@/shared/config/site'
import type { Category } from '@/entities/category'

async function fetchSafely<T>(query: string, fallback: T): Promise<T> {
  try {
    return await client.fetch(query)
  } catch {
    return fallback
  }
}

export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
  const baseUrl = siteConfig.url

  // Static pages
  const staticPages: MetadataRoute.Sitemap = [
    {
      url: baseUrl,
      lastModified: new Date(),
      changeFrequency: 'daily',
      priority: 1,
    },
    {
      url: `${baseUrl}/posts`,
      lastModified: new Date(),
      changeFrequency: 'daily',
      priority: 0.9,
    },
    {
      url: `${baseUrl}/events`,
      lastModified: new Date(),
      changeFrequency: 'daily',
      priority: 0.8,
    },
    {
      url: `${baseUrl}/about`,
      lastModified: new Date(),
      changeFrequency: 'monthly',
      priority: 0.7,
    },
    {
      url: `${baseUrl}/contacts`,
      lastModified: new Date(),
      changeFrequency: 'monthly',
      priority: 0.7,
    },
  ]

  // Dynamic pages - posts
  const postSlugs = await fetchSafely<string[]>(POST_SLUGS_QUERY, [])
  const postPages: MetadataRoute.Sitemap = postSlugs.map((slug) => ({
    url: `${baseUrl}/posts/${slug}`,
    lastModified: new Date(),
    changeFrequency: 'weekly' as const,
    priority: 0.8,
  }))

  // Dynamic pages - events
  const eventSlugs = await fetchSafely<string[]>(EVENT_SLUGS_QUERY, [])
  const eventPages: MetadataRoute.Sitemap = eventSlugs.map((slug) => ({
    url: `${baseUrl}/events/${slug}`,
    lastModified: new Date(),
    changeFrequency: 'weekly' as const,
    priority: 0.7,
  }))

  // Dynamic pages - categories
  const categories = await fetchSafely<Category[]>(CATEGORIES_QUERY, [])
  const categoryPages: MetadataRoute.Sitemap = categories.map((category) => ({
    url: `${baseUrl}/categories/${category.slug.current}`,
    lastModified: new Date(),
    changeFrequency: 'weekly' as const,
    priority: 0.6,
  }))

  return [...staticPages, ...postPages, ...eventPages, ...categoryPages]
}