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Copy pathcompanion.ts
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133 lines (119 loc) · 3.63 KB
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import { getGlobalConfig } from '../utils/config.js'
import {
type Companion,
type CompanionBones,
EYES,
HATS,
RARITIES,
RARITY_WEIGHTS,
type Rarity,
SPECIES,
STAT_NAMES,
type StatName,
} from './types.js'
// Mulberry32 — tiny seeded PRNG, good enough for picking ducks
function mulberry32(seed: number): () => number {
let a = seed >>> 0
return function () {
a |= 0
a = (a + 0x6d2b79f5) | 0
let t = Math.imul(a ^ (a >>> 15), 1 | a)
t = (t + Math.imul(t ^ (t >>> 7), 61 | t)) ^ t
return ((t ^ (t >>> 14)) >>> 0) / 4294967296
}
}
function hashString(s: string): number {
if (typeof Bun !== 'undefined') {
return Number(BigInt(Bun.hash(s)) & 0xffffffffn)
}
let h = 2166136261
for (let i = 0; i < s.length; i++) {
h ^= s.charCodeAt(i)
h = Math.imul(h, 16777619)
}
return h >>> 0
}
function pick<T>(rng: () => number, arr: readonly T[]): T {
return arr[Math.floor(rng() * arr.length)]!
}
function rollRarity(rng: () => number): Rarity {
const total = Object.values(RARITY_WEIGHTS).reduce((a, b) => a + b, 0)
let roll = rng() * total
for (const rarity of RARITIES) {
roll -= RARITY_WEIGHTS[rarity]
if (roll < 0) return rarity
}
return 'common'
}
const RARITY_FLOOR: Record<Rarity, number> = {
common: 5,
uncommon: 15,
rare: 25,
epic: 35,
legendary: 50,
}
// One peak stat, one dump stat, rest scattered. Rarity bumps the floor.
function rollStats(
rng: () => number,
rarity: Rarity,
): Record<StatName, number> {
const floor = RARITY_FLOOR[rarity]
const peak = pick(rng, STAT_NAMES)
let dump = pick(rng, STAT_NAMES)
while (dump === peak) dump = pick(rng, STAT_NAMES)
const stats = {} as Record<StatName, number>
for (const name of STAT_NAMES) {
if (name === peak) {
stats[name] = Math.min(100, floor + 50 + Math.floor(rng() * 30))
} else if (name === dump) {
stats[name] = Math.max(1, floor - 10 + Math.floor(rng() * 15))
} else {
stats[name] = floor + Math.floor(rng() * 40)
}
}
return stats
}
const SALT = 'friend-2026-401'
export type Roll = {
bones: CompanionBones
inspirationSeed: number
}
function rollFrom(rng: () => number): Roll {
const rarity = rollRarity(rng)
const bones: CompanionBones = {
rarity,
species: pick(rng, SPECIES),
eye: pick(rng, EYES),
hat: rarity === 'common' ? 'none' : pick(rng, HATS),
shiny: rng() < 0.01,
stats: rollStats(rng, rarity),
}
return { bones, inspirationSeed: Math.floor(rng() * 1e9) }
}
// Called from three hot paths (500ms sprite tick, per-keystroke PromptInput,
// per-turn observer) with the same userId → cache the deterministic result.
let rollCache: { key: string; value: Roll } | undefined
export function roll(userId: string): Roll {
const key = userId + SALT
if (rollCache?.key === key) return rollCache.value
const value = rollFrom(mulberry32(hashString(key)))
rollCache = { key, value }
return value
}
export function rollWithSeed(seed: string): Roll {
return rollFrom(mulberry32(hashString(seed)))
}
export function companionUserId(): string {
const config = getGlobalConfig()
return config.oauthAccount?.accountUuid ?? config.userID ?? 'anon'
}
// Regenerate bones from userId, merge with stored soul. Bones never persist
// so species renames and SPECIES-array edits can't break stored companions,
// and editing config.companion can't fake a rarity.
export function getCompanion(): Companion | undefined {
const stored = getGlobalConfig().companion
if (!stored) return undefined
const { bones } = roll(companionUserId())
// bones last so stale bones fields in old-format configs get overridden
return { ...stored, ...bones }
}