import { createClient } from '@supabase/supabase-js'

export default {
  async fetch(request, env) {
    const supabase = createClient(env.SUPABASE_URL, env.SUPABASE_KEY)

    const { searchParams } = new URL(request.url)
    const query = searchParams.get('q') || ''
    const types = searchParams.get('type')?.split(',') || []
    const page = parseInt(searchParams.get('page') || '1', 10)
    const pageSize = parseInt(searchParams.get('pageSize') || '10', 10)
    const offset = (page - 1) * pageSize

    try {
      let supabaseQuery = supabase
        .from('optimized_search_index')
        .select(
          'id, title, description, url, tags, type, total_plays, genre_name, genre_url',
          { count: 'exact' }
        )
        .range(offset, offset + pageSize - 1)

      if (types.length > 0) supabaseQuery = supabaseQuery.in('type', types)

      if (query) {
        const queryLower = `%${query.toLowerCase()}%`
        supabaseQuery = supabaseQuery.or(
          `title.ilike.${queryLower},description.ilike.${queryLower}`
        )
      }

      const { data, error, count } = await supabaseQuery

      if (error) {
        console.error('Supabase query error:', error)
        return new Response(JSON.stringify({ error: 'Error fetching data' }), { status: 500 })
      }

      if (!data || data.length === 0) {
        console.warn('No results found.')
        return new Response(
          JSON.stringify({ results: [], total: 0, page, pageSize }),
          { headers: { 'Content-Type': 'application/json' } }
        )
      }

      return new Response(
        JSON.stringify({
          results: data,
          total: count || 0,
          page,
          pageSize,
        }),
        {
          headers: {
            'Content-Type': 'application/json',
            'Access-Control-Allow-Origin': '*',
          },
        }
      )
    } catch (error) {
      console.error('Unexpected error:', error)
      return new Response(JSON.stringify({ error: 'Internal Server Error' }), { status: 500 })
    }
  },
}