/**
 * Generate SQL UPDATE statements to backfill external_author and external_author_avatar.
 * Outputs SQL that you can paste into the Supabase SQL Editor.
 *
 * Usage:
 *   1. Start the API: cd api && bun run dev
 *   2. Run: bun run scripts/backfill-authors-sql.ts
 *   3. Copy the output SQL and paste into Supabase SQL Editor
 */

const SUPABASE_URL = process.env.VITE_SUPABASE_URL || ''
const SUPABASE_KEY = process.env.VITE_SUPABASE_ANON_KEY || ''
const API_URL = process.env.VITE_API_URL || 'http://localhost:3001'

if (!SUPABASE_URL || !SUPABASE_KEY) {
  console.error('Missing VITE_SUPABASE_URL or VITE_SUPABASE_ANON_KEY in .env')
  process.exit(1)
}

function isExternalUrl(url: string): boolean {
  return (
    url.includes('youtube.com') ||
    url.includes('youtu.be') ||
    url.includes('spotify.com') ||
    url.includes('dailymotion.com') ||
    url.includes('dai.ly') ||
    url.includes('soundcloud.com')
  )
}

function escapeSql(s: string): string {
  return s.replace(/'/g, "''")
}

async function main() {
  // Fetch all podcasts (read-only, anon key is fine)
  const res = await fetch(`${SUPABASE_URL}/rest/v1/podcasts?select=id,audio_url,external_author,external_author_avatar&order=created_at.desc`, {
    headers: {
      apikey: SUPABASE_KEY,
      Authorization: `Bearer ${SUPABASE_KEY}`,
    },
  })

  if (!res.ok) {
    console.error('Failed to fetch podcasts:', await res.text())
    process.exit(1)
  }

  const podcasts: { id: string; audio_url: string; external_author: string | null; external_author_avatar: string | null }[] = await res.json()
  const toUpdate = podcasts.filter(p => isExternalUrl(p.audio_url) && (!p.external_author || !p.external_author_avatar))

  console.error(`Found ${podcasts.length} total podcasts, ${toUpdate.length} external to backfill\n`)

  if (toUpdate.length === 0) {
    console.error('Nothing to do!')
    return
  }

  const statements: string[] = []

  for (const podcast of toUpdate) {
    try {
      const metaRes = await fetch(`${API_URL}/api/metadata?url=${encodeURIComponent(podcast.audio_url)}`)
      if (!metaRes.ok) {
        console.error(`  SKIP ${podcast.id} — API returned ${metaRes.status}`)
        continue
      }

      const meta = await metaRes.json()
      if (!meta.author && !meta.authorAvatar) {
        console.error(`  SKIP ${podcast.id} — no author data`)
        continue
      }

      const sets: string[] = []
      if (meta.author) sets.push(`external_author = '${escapeSql(meta.author)}'`)
      if (meta.authorAvatar) sets.push(`external_author_avatar = '${escapeSql(meta.authorAvatar)}'`)

      if (sets.length > 0) {
        statements.push(`UPDATE public.podcasts SET ${sets.join(', ')} WHERE id = '${podcast.id}';`)
        console.error(`  OK   ${podcast.id} — ${meta.author} ${meta.authorAvatar ? '(+avatar)' : '(no avatar)'}`)
      }

      await new Promise(r => setTimeout(r, 200))
    } catch (err) {
      console.error(`  ERR  ${podcast.id} — ${err}`)
    }
  }

  // Output the SQL to stdout
  console.log('-- Backfill external authors and avatars')
  console.log('-- Generated by scripts/backfill-authors-sql.ts\n')
  console.log(statements.join('\n'))
  console.error(`\nGenerated ${statements.length} UPDATE statements. Paste the output into Supabase SQL Editor.`)
}

main()