'use strict'

const crypto = require('hypercore-crypto')
const b4a = require('b4a')

/**
 * Per-guild jitter for mesh retries (Phase 409 P409-14).
 */
function guildMeshJitterMs (guildId, attempt = 0, baseMs = 1000) {
  const gid = String(guildId || '')
  const seed = crypto.hash(b4a.from(`pearcord:mesh-jitter:${gid}`)).readUInt32BE(0)
  const spread = Math.min(4000, Math.max(200, baseMs * 0.35))
  const jitter = (seed % spread) + ((attempt * 137) % 200)
  return Math.floor(baseMs + jitter)
}

/**
 * Quiet mode: reduce sync churn when mesh has zero peers (P409-15).
 */
function shouldUseMeshQuietMode ({ peerCount = 0, meshBounded = false } = {}) {
  if (meshBounded) return false
  return Number(peerCount) <= 0
}

function meshQuietModePollMultiplier () {
  return Math.max(2, Number(process.env.PEARCORD_MESH_QUIET_POLL_MULT) || 3)
}

module.exports = {
  guildMeshJitterMs,
  shouldUseMeshQuietMode,
  meshQuietModePollMultiplier
}