export const vowels = [..."aeiou"]
export const consonants = [..."bcdfghjklmnprstvwxyz"]

const bad = new Set<string>([
	"fuc", "sex", "cum", "dic", "coc", "pen",
	"vag", "pus", "gay", "fap", "jiz", "fag",
	"cun", "nig", "jew", "goy", "sem", "bal",
	"fat", "god", "big", "dog", "cow", "pet",
	"vax", "sis", "rot", "zog", "ana", "uti",
	"cat", "bag", "cuc", "fuk", "fak", "wet",
	"cux", "bug", "gey", "pig", "rat", "bat",
	"dik", "bed", "boy", "man", "fem", "men",
	"nob", "rub", "fut", "jap", "tit", "gun",
	"job", "nip", "but", "rim", "guy", "suc",
	"dad", "mom", "buk", "jis", "peg", "kox",
	"ded", "mum", "son", "nog", "hun", "wop",
	"cuk",
])

function subsample(n: number, arr: string[]) {
	const excess = arr.length - n;
	if (excess <= 0) return arr; // already the right size or smaller

	// use a precise incrementer to ensure exact removal count
	const interval = arr.length / excess;
	const result = [];
	let nextRemoveIndex = interval;

	for (let i = 0; i < arr.length; i++) {
		// remove item if we're at or just past the next removal point
		if (i >= Math.round(nextRemoveIndex)) {
			nextRemoveIndex += interval; // move to the next removal point
		} else {
			result.push(arr[i]);
		}
	}

	return result.slice(0, n); // ensure exactly n elements
}

function dedupe(arr: string[]) {
	return [...new Set(arr)]
}

const xox = dedupe(subsample(
	256,
	consonants.map(
		a => vowels.map(
			b => consonants.map(
				c => (a + b + c)
			)
		)
	).flat(2).filter(x => !bad.has(x)),
))

const oxo = dedupe(subsample(
	256,
	vowels.map(
		a => consonants.map(
			b => vowels.map(
				c => (a + b + c)))
	).flat(2).filter(x => !bad.has(x)),
))

const combo = dedupe([
	...subsample(192, xox),
	...subsample(64, oxo),
])

if (xox.length !== 256) throw new Error("xox not 256")
if (oxo.length !== 256) throw new Error("oxo not 256")
if (combo.length !== 256) throw new Error("syllables not 256")

export const syllables = {xox, oxo, combo}