Function apportionCredits

apps/sim/lib/billing/credits/conversion.ts:70–99

(
  components: { key: K; dollars: number }[]
)

 * Each component's `dollars` is expected to already include any cost multiplier.
 */
export function apportionCredits<K extends string>(
  components: { key: K; dollars: number }[]
): Record<K, number> {
  const result = {} as Record<K, number>

  const sanitized = components.map((c) => ({
    key: c.key,
    dollars: Number.isFinite(c.dollars) && c.dollars > 0 ? c.dollars : 0,
  }))

  const totalDollars = sanitized.reduce((sum, c) => sum + c.dollars, 0)
  const targetCredits = dollarsToCredits(totalDollars)

  const exact = sanitized.map((c) => ({
    key: c.key,
    floor: Math.floor(c.dollars * CREDIT_MULTIPLIER),
    frac: c.dollars * CREDIT_MULTIPLIER - Math.floor(c.dollars * CREDIT_MULTIPLIER),
  }))

  for (const c of exact) result[c.key] = c.floor

  let remainder = targetCredits - exact.reduce((sum, c) => sum + c.floor, 0)
  const byFraction = [...exact].sort((a, b) => b.frac - a.frac)
  for (let i = 0; i < byFraction.length && remainder > 0; i++) {
    result[byFraction[i].key] += 1
    remainder--
  }

  return result
}

/**
 * Format a dollar amount as a comma-separated credit string.