scripts/cast-cup.mjs

import { randomInt } from 'node:crypto'

const strict = process.argv.includes('--strict')
const attemptIndex = process.argv.indexOf('--attempt')
const attempt = attemptIndex === -1 ? 1 : Number.parseInt(process.argv[attemptIndex + 1] ?? '', 10)

if (!Number.isInteger(attempt) || attempt < 1) {
  throw new Error('Use a positive integer after --attempt.')
}

if (strict && attempt > 7) {
  throw new Error('Serious three-sheng-cup mode is limited to seven attempts.')
}

const completionGuaranteeApplied = strict && attempt >= 5
const roll = randomInt(10_000) / 10_000
const cup = completionGuaranteeApplied ? 'sheng' : roll < 0.52 ? 'sheng' : roll < 0.76 ? 'xiao' : 'yin'
const labels = {
  sheng: '圣杯',
  xiao: '笑杯',
  yin: '阴杯'
}

process.stdout.write(
  `${JSON.stringify(
    {
      mode: strict ? '严肃模式：三圣杯' : '一般模式：一圣杯',
      attempt,
      cup,
      label: labels[cup],
      completionGuaranteeApplied
    },
    null,
    2
  )}\n`
)