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const greaterThanOrEqual = (a, b) => a >= b
const lessThanOrEqual = (a, b) => a <= b
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 multiply = (die1, die2) => {
return () => {
return [() => roll(die1) * roll(die2)]
}
}
const divide = (die1, die2) => {
return () => {
return [() => Math.floor(roll(die1) / roll(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 = (comparison, die1, die2) => {
return () => {
const explodeOn = roll(die1)
return die2().map(die => () => {
let lastRoll = die()
let total = lastRoll
while (comparison(lastRoll, explodeOn)) {
lastRoll = die()
total += lastRoll
}
return total
})
}
}
const explodeAbove = (die1, die2) => {
return explode(greaterThanOrEqual, die1, die2)
}
const explodeUnder = (die1, die2) => {
return explode(lessThanOrEqual, die1, die2)
}
const keep = (order, die1, die2) => {
return () => {
const numberToKeep = roll(die1)
let rolls = die2().map(die => [die, die()])
rolls.sort(order)
return rolls.slice(0, numberToKeep).map(pair => {
let returnedOriginal = false
return () => {
if (!returnedOriginal) {
returnedOriginal = true
return pair[1]
} else {
return pair[0]()
}
}
})
}
}
const keepHigh = (die1, die2) => {
return keep((a, b) => (b[1] - a[1]), die1, die2)
}
const keepLow = (die1, die2) => {
return keep((a, b) => (a[1] - b[1]), die1, die2)
}
const again = (comparison, die1, die2) => {
return () => {
const againOn = roll(die1)
let rolls = []
let rollAgain = []
const rollDie = (die) => {
const roll = die()
if (comparison(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 againAbove = (die1, die2) => {
return again(greaterThanOrEqual, die1, die2)
}
const againUnder = (die1, die2) => {
return again(lessThanOrEqual, die1, die2)
}
const threshold = (comparison, die1, die2) => {
return () => {
const cutoff = roll(die1)
return die2().map(die => {
return () => {
if (comparison(die(), cutoff)) {
return 1
} else {
return 0
}
}
})
}
}
const thresholdHigh = (die1, die2) => {
return threshold(greaterThanOrEqual, die1, die2)
}
const thresholdLow = (die1, die2) => {
return threshold(lessThanOrEqual, die1, die2)
}
const repeat = (die1, die2) => {
return () => {
const times = roll(die2)
let results = []
for (let i = 0; i < times; i++) {
results = results.concat(die1())
}
return results
}
}
exports.pool = pool
exports.roll = roll
exports.constant = constant
exports.d = d
exports.add = add
exports.subtract = subtract
exports.multiply = multiply
exports.divide = divide
exports.bonusAdd = bonusAdd
exports.bonusSubtract = bonusSubtract
exports.negative = negative
exports.explodeAbove = explodeAbove
exports.explodeUnder = explodeUnder
exports.keepHigh = keepHigh
exports.keepLow = keepLow
exports.againAbove = againAbove
exports.againUnder = againUnder
exports.thresholdHigh = thresholdHigh
exports.thresholdLow = thresholdLow
exports.repeat = repeat
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