scarab reroll calc

function randomInArray(arr) {
  return arr[Math.floor(Math.random() * arr.length)]
}

function oddsOfTopThree(rerolls) {
  let count = 0
  const scarabs = [...Array(16).keys()].map((i) => i + 1) // 1-16
  for (let i = 0; i < rerolls; i++) {
    const scarab = randomInArray(scarabs)
    if (scarab > scarabs.length - 3) count++
  }
  return count / rerolls
}

function main() {
  const initialScarabValue = 6
  const expectedAvgValue = 42
  const rerollCost = 1
  const rerolls = 1000
  const avgRerolls = oddsOfTopThree(rerolls)
  console.log(`Statisstics is based on ${rerolls} rerolls`)

  console.log(`Average rerolls per scarab ${Math.floor(1 / avgRerolls)}c`)

  const avgRerollCost = (1 / avgRerolls) * rerollCost
  console.log(`Cost spent per scarab ${Math.floor(avgRerollCost)}c`)

  const balancePer =
    Math.floor(expectedAvgValue - avgRerollCost) - initialScarabValue

  if (balancePer > 0) console.log(`Avg profit per reroll: ${balancePer}c`)
  else console.log(`Avg loss per reroll: ${balancePer}c`)
}

main()