import { randomBytes } from 'node:crypto'
import Computer from '#models/computer'

/**
 * Generates a URL-safe, non-guessable share token.
 */
function generateShareToken(): string {
  return randomBytes(24).toString('base64url')
}

/**
 * Enables sharing for a computer, generating a share token if it doesn't
 * already have one. Idempotent: calling it again just updates the display
 * options without rotating the existing token.
 */
async function enableSharing(
  computer: Computer,
  options: { showSellPrice: boolean; showCost: boolean }
) {
  if (!computer.shareToken) {
    computer.shareToken = generateShareToken()
  }
  computer.shareEnabled = true
  computer.shareShowSellPrice = options.showSellPrice
  computer.shareShowCost = options.showCost
  await computer.save()
  return computer
}

/**
 * Disables sharing for a computer. The share token is kept so re-enabling
 * later doesn't require distributing a new link, but the public route only
 * resolves computers where shareEnabled is true.
 */
async function disableSharing(computer: Computer) {
  computer.shareEnabled = false
  await computer.save()
  return computer
}

/**
 * Rotates the share token, invalidating any previously distributed link.
 */
async function rotateShareToken(computer: Computer) {
  computer.shareToken = generateShareToken()
  await computer.save()
  return computer
}

export { enableSharing, disableSharing, rotateShareToken }