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const constant = n => () => [() => n]
const pool = (die) => {
return die().map((d) => d())
}
const roll = (die) => {
return pool(die).reduce((a, b) => (a + b), 0)
}
const d = (number, sides) => {
return () => {
let pool = []
const currentNumber = roll(number)
const currentSides = roll(sides)
for (let i = 0; i < currentNumber; i++) {
pool.push(() => (1 + Math.floor(Math.random() * currentSides)))
}
return pool
}
}
const add = (die1, die2) => {
return () => {
return die1().concat(die2())
}
}
const negative = (die) => {
return () => {
return die().map(die => () => (-die()))
}
}
const subtract = (die1, die2) => {
return () => {
return die1().concat(negative(die2)())
}
}
const bonusAdd = (die1, die2) => {
return () => {
return die1().map(die => {
return () => die() + roll(die2)
})
}
}
const bonusSubtract = (die1, die2) => {
const negative2 = negative(die2)
return () => {
return die1().map(die => {
return () => die() + roll(negative2)
})
}
}
const explode = (die1, die2) => {
return () => {
const explodeOn = roll(die1)
return die2().map(die => () => {
let lastRoll = die()
let total = lastRoll
while (lastRoll >= explodeOn) {
lastRoll = die()
total += lastRoll
}
return total
})
}
}
const keepHigh = (die1, die2) => {
return () => {
const numberToKeep = roll(die1)
let rolls = die2().map(die => [die, die()])
rolls.sort((a, b) => (a[1] - b[1])).reverse()
return rolls.slice(0, numberToKeep).map(pair => {
let returnedOriginal = false
return () => {
if (!returnedOriginal) {
returnedOriginal = true
return pair[1]
} else {
return pair[0]()
}
}
})
}
}
const keepLow = (die1, die2) => {
return () => {
const numberToKeep = roll(die1)
let rolls = die2().map(die => [die, die()])
rolls.sort((a, b) => (a[1] - b[1]))
return rolls.slice(0, numberToKeep).map(pair => {
let returnedOriginal = false
return () => {
if (!returnedOriginal) {
returnedOriginal = true
return pair[1]
} else {
return pair[0]()
}
}
})
}
}
const again = (die1, die2) => {
return () => {
const againOn = roll(die1)
let rolls = []
let rollAgain = []
const rollDie = (die) => {
const roll = die()
if (roll >= againOn) {
rollAgain.push(die)
}
let returnedOriginal = false
rolls.push(() => {
if (!returnedOriginal) {
returnedOriginal = true
return roll
} else {
return die()
}
})
}
die2().forEach(rollDie)
while (rollAgain.length > 0) {
const oldRollAgain = rollAgain
rollAgain = []
oldRollAgain.forEach(rollDie)
}
return rolls
}
}
const threshold = (die1, die2) => {
return () => {
const cutoff = roll(die1)
return die2().map(die => {
return () => {
if (die() >= cutoff) {
return 1
} else {
return 0
}
}
})
}
}
exports.pool = pool
exports.roll = roll
exports.constant = constant
exports.d = d
exports.add = add
exports.subtract = subtract
exports.bonusAdd = bonusAdd
exports.bonusSubtract = bonusSubtract
exports.negative = negative
exports.explode = explode
exports.keepHigh = keepHigh
exports.keepLow = keepLow
exports.again = again
exports.threshold = threshold
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