import { createServerFileRoute } from '@tanstack/react-start/server'

// Function to get Client Credentials access token
async function getClientCredentialsToken(): Promise<string> {
  const clientId = process.env.VITE_SPOTIFY_CLIENT_ID
  const clientSecret = process.env.SPOTIFY_CLIENT_SECRET

  if (!clientId || !clientSecret) {
    throw new Error('Missing Spotify client credentials')
  }

  const response = await fetch('https://accounts.spotify.com/api/token', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/x-www-form-urlencoded',
      'Authorization': `Basic ${Buffer.from(`${clientId}:${clientSecret}`).toString('base64')}`,
    },
    body: 'grant_type=client_credentials',
  })

  if (!response.ok) {
    throw new Error('Failed to get Spotify access token')
  }

  const data = await response.json()
  return data.access_token
}

export const ServerRoute = createServerFileRoute('/api/spotify/search').methods({
  GET: async ({ request }: { request: Request }) => {
    try {
      const url = new URL(request.url)
      const query = url.searchParams.get('q')

      if (!query) {
        return new Response(
          JSON.stringify({ error: 'Query parameter q is required' }),
          {
            status: 400,
            headers: { 'Content-Type': 'application/json' },
          }
        )
      }

      // Get client credentials access token
      const accessToken = await getClientCredentialsToken()

      // Search using Spotify API directly
      const searchUrl = `https://api.spotify.com/v1/search?q=${encodeURIComponent(query)}&type=track&limit=20`

      const searchResponse = await fetch(searchUrl, {
        headers: {
          'Authorization': `Bearer ${accessToken}`,
        },
      })

      if (!searchResponse.ok) {
        throw new Error('Spotify search request failed')
      }

      const searchResult = await searchResponse.json()

      return new Response(
        JSON.stringify({ tracks: searchResult.tracks.items }),
        {
          status: 200,
          headers: { 'Content-Type': 'application/json' },
        }
      )
    } catch (error) {
      console.error('Search error:', error)
      return new Response(
        JSON.stringify({ error: 'Search failed', details: error instanceof Error ? error.message : 'Unknown error' }),
        {
          status: 500,
          headers: { 'Content-Type': 'application/json' },
        }
      )
    }
  },
})