/**
 * Waits for the Nostr relay to be reachable before seeding.
 * Used by the Docker seeder container.
 *
 * Usage: node scripts/wait-for-relay.mjs
 * Env:   RELAY_URL (default ws://localhost:7777)
 */
import http from 'node:http'

const wsUrl = process.env.RELAY_URL || 'ws://localhost:7777'
const httpUrl = wsUrl.replace('ws://', 'http://').replace('wss://', 'https://')
const maxAttempts = 45
const intervalMs = 2000

console.log(`Waiting for relay at ${httpUrl} ...`)

for (let i = 1; i <= maxAttempts; i++) {
  const ok = await new Promise((resolve) => {
    const req = http.get(httpUrl, (res) => {
      res.resume() // drain response
      // Accept ANY HTTP response as "alive" — some relays return 4xx
      // for plain GET because they expect a WebSocket upgrade
      resolve(true)
    })
    req.on('error', (err) => {
      if (i === 1) console.log(`    (${err.code || err.message})`)
      resolve(false)
    })
    req.setTimeout(3000, () => {
      req.destroy()
      resolve(false)
    })
  })

  if (ok) {
    console.log(`Relay is ready! (attempt ${i}/${maxAttempts})`)
    process.exit(0)
  }

  console.log(`  attempt ${i}/${maxAttempts} — not ready yet`)
  await new Promise((r) => setTimeout(r, intervalMs))
}

console.error(`Relay did not become ready after ${maxAttempts} attempts`)
process.exit(1)