/**
 * Encode number to Base62
 */
function toBase62(num: number): string {
  const base62 = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'
  let encoded = ''
  let n = num
  if (n === 0) return '0'

  while (n > 0) {
    encoded = base62[n % 62] + encoded
    n = Math.floor(n / 62)
  }
  return encoded
}

/**
 * Generate compact Silicon ID
 * Format: base62(timestamp + random), min length 8 chars
 */
export function generateSiliconId(): string {
  const epochStart = new Date('2020-01-01').getTime()
  const now = Date.now()

  // relative timestamp since epochStart
  const timestamp = (now - epochStart) % 1_000_000_000_000

  // add randomness (0–999)
  const randomNum = Math.floor(Math.random() * 1000)

  // combine into one big number
  const finalNum = timestamp * 1000 + randomNum

  // convert to base62
  return toBase62(finalNum).padStart(10, '0') // always at least 10 chars
}