import { randomInt } from 'node:crypto'

export function randomUserColor() {
  const h = randomInt(360)
  const s = 60 + randomInt(30)
  const l = 50 + randomInt(15)
  const a = s * Math.min(l, 100 - l) / 100
  const f = (n: number) => {
    const k = (n + h / 30) % 12
    const v = l / 100 - a * Math.max(-1, Math.min(k - 3, 9 - k, 1))
    return Math.round(Math.min(1, Math.max(0, v)) * 255)
  }
  return `#${[f(0), f(8), f(4)].map(v => v.toString(16).padStart(2, '0')).join('')}`
}

export function avatarUrl(avatar: string | null) {
  return avatar ? `/uploads/avatars/${avatar}` : null
}