import { MetadataRoute } from 'next'
import TopicModel from '@/models/topic'

export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
  const baseUrl = process.env.NEXT_PUBLIC_SITE_URL || 'http://localhost:4024'

  // Static pages
  const staticPages = [
    {
      url: baseUrl,
      lastModified: new Date(),
      changeFrequency: 'daily' as const,
      priority: 1,
    },
    {
      url: `${baseUrl}/about`,
      lastModified: new Date(),
      changeFrequency: 'monthly' as const,
      priority: 0.8,
    },
    {
      url: `${baseUrl}/services`,
      lastModified: new Date(),
      changeFrequency: 'weekly' as const,
      priority: 0.9,
    },
    {
      url: `${baseUrl}/services/cloud-instance`,
      lastModified: new Date(),
      changeFrequency: 'weekly' as const,
      priority: 0.8,
    },
    {
      url: `${baseUrl}/services/hosting-control-panel`,
      lastModified: new Date(),
      changeFrequency: 'weekly' as const,
      priority: 0.8,
    },
    {
      url: `${baseUrl}/services/kubernetes`,
      lastModified: new Date(),
      changeFrequency: 'weekly' as const,
      priority: 0.8,
    },
    {
      url: `${baseUrl}/services/vpn`,
      lastModified: new Date(),
      changeFrequency: 'weekly' as const,
      priority: 0.8,
    },
    {
      url: `${baseUrl}/services/human-developer`,
      lastModified: new Date(),
      changeFrequency: 'weekly' as const,
      priority: 0.8,
    },
    {
      url: `${baseUrl}/tools`,
      lastModified: new Date(),
      changeFrequency: 'weekly' as const,
      priority: 0.7,
    },
    {
      url: `${baseUrl}/tools/speech-to-text`,
      lastModified: new Date(),
      changeFrequency: 'monthly' as const,
      priority: 0.6,
    },
    {
      url: `${baseUrl}/contact`,
      lastModified: new Date(),
      changeFrequency: 'monthly' as const,
      priority: 0.7,
    },
    {
      url: `${baseUrl}/topics`,
      lastModified: new Date(),
      changeFrequency: 'daily' as const,
      priority: 0.8,
    },
    {
      url: `${baseUrl}/search`,
      lastModified: new Date(),
      changeFrequency: 'daily' as const,
      priority: 0.7,
    },
    {
      url: `${baseUrl}/feedback`,
      lastModified: new Date(),
      changeFrequency: 'monthly' as const,
      priority: 0.6,
    },
    {
      url: `${baseUrl}/auth`,
      lastModified: new Date(),
      changeFrequency: 'monthly' as const,
      priority: 0.5,
    },
    {
      url: `${baseUrl}/terms`,
      lastModified: new Date(),
      changeFrequency: 'yearly' as const,
      priority: 0.3,
    },
    {
      url: `${baseUrl}/privacy`,
      lastModified: new Date(),
      changeFrequency: 'yearly' as const,
      priority: 0.3,
    },
    {
      url: `${baseUrl}/legal-agreement`,
      lastModified: new Date(),
      changeFrequency: 'yearly' as const,
      priority: 0.3,
    },
    {
      url: `${baseUrl}/refund-policy`,
      lastModified: new Date(),
      changeFrequency: 'yearly' as const,
      priority: 0.3,
    },
  ]

  // Dynamic topic pages
  let topicPages: MetadataRoute.Sitemap = []
  let tagPages: MetadataRoute.Sitemap = []

  try {
    // Get published topic posts
    const topics = await TopicModel.find({ isDraft: false })
      .select('slug publishedAt updatedAt')
      .lean()

    topicPages = topics.map((topic) => ({
      url: `${baseUrl}/topics/${topic.slug}`,
      lastModified: new Date(topic.publishedAt),
      changeFrequency: 'weekly' as const,
      priority: 0.6,
    }))

    // Get unique tags from all topics
    const allTopics = await TopicModel.find({ isDraft: false }).select('tags').lean()

    const tagsSet = new Set<string>()
    allTopics.forEach((topic) => {
      topic.tags?.forEach((tag) => tagsSet.add(tag.name))
    })

    tagPages = Array.from(tagsSet).map((tagName) => ({
      url: `${baseUrl}/topics?tag=${encodeURIComponent(tagName)}`,
      lastModified: new Date(),
      changeFrequency: 'weekly' as const,
      priority: 0.5,
    }))
  } catch (error) {
    console.error('Error generating dynamic sitemap entries:', error)
    // Continue with static pages only if database is unavailable
  }

  return [...staticPages, ...topicPages, ...tagPages]
}