112 lines
2.5 KiB
TypeScript
112 lines
2.5 KiB
TypeScript
import { utcToZonedTime } from 'date-fns-tz'
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import { BXL_TZ, GAME_STARTING_DATE } from '@/globals'
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export function getCurrentDate(): Date {
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return utcToZonedTime(new Date(), BXL_TZ)
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}
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export function getCurrentSessionKey(): string {
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const now = getCurrentDate()
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// https://stackoverflow.com/a/28149561
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const tzoffset = now.getTimezoneOffset() * 60000
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const localISOTime = new Date(now.getTime() - tzoffset).toISOString()
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return localISOTime.slice(0, 10)
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}
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/**
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*
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* @param a
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* @param b
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* @returns Percentage rounded to 2 decimals
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*/
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export function percentageDiff(a: number, b: number): number {
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return Math.round(((a - b) / ((a + b) / 2)) * 100) / 100
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}
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// #region RNG
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export let random = Math.random
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/**
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*
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* @param min inclusive
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* @param max exclusive
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* @returns
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*/
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export function randRange(min: number, max: number, rnd = random): number {
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return Math.floor(rnd() * (max - min) + min)
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}
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export function randItem<T>(items: T[], rnd = random): T {
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return items[Math.floor(rnd() * items.length)]
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}
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export function setMathPRNG(): void {
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random = Math.random
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}
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export function setDailyPRNG(): void {
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random = initDailyPRNG()
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}
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/**
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* Shuffles an array in place and returns it
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* @param array
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* @returns
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*/
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export function shuffle<T>(array: T[]): T[] {
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let currentIndex = array.length
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let randomIndex: number
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// While there remain elements to shuffle...
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while (currentIndex !== 0) {
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// Pick a remaining element...
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randomIndex = Math.floor(random() * currentIndex)
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currentIndex--
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// And swap it with the current element.
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;[array[currentIndex], array[randomIndex]] = [
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array[randomIndex],
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array[currentIndex],
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]
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}
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return array
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}
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function initDailyPRNG(): () => number {
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// Prefix the seed when in dev to avoid spoiling myself while working on it
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const prefix = import.meta.env.DEV ? 'dev-' : ''
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const hashed = hashStr(prefix + getCurrentSessionKey())
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return mulberry32(hashed)
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}
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function mulberry32(a: number) {
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return function () {
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let t = (a += 0x6d2b79f5)
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t = Math.imul(t ^ (t >>> 15), t | 1)
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t ^= t + Math.imul(t ^ (t >>> 7), t | 61)
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return ((t ^ (t >>> 14)) >>> 0) / 4294967296
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}
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}
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/**
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* https://stackoverflow.com/a/7616484
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* @param val
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* @returns
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*/
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function hashStr(val: string): number {
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let hash = 0
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if (val.length === 0) {
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return 0
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}
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for (let i = 0; i < val.length; ++i) {
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hash = (hash << 5) - hash + val[i].charCodeAt(0)
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hash |= 0
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}
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return hash
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}
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// #endregion RNG
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