flotilla/src/lib/util.ts

import * as nip19 from "nostr-tools/nip19"
import {range, DAY, hexToBytes, bytesToHex} from "@welshman/lib"

export const nsecEncode = (secret: string) => nip19.nsecEncode(hexToBytes(secret))

export const nsecDecode = (nsec: string) => {
  const {type, data} = nip19.decode(nsec)

  if (type !== "nsec") throw new Error(`Invalid nsec: ${nsec}`)

  return bytesToHex(data)
}

export const day = (seconds: number) => Math.floor(seconds / DAY)

export const daysBetween = (start: number, end: number) => [...range(start, end, DAY)].map(day)

export const ucFirst = (s: string) => s.slice(0, 1).toUpperCase() + s.slice(1)

export const errorMessage = (err: unknown) => String(err).replace(/^.*Error: /, "")

export const buildUrl = (base: string | URL, ...pathname: string[]) => {
  const url = new URL(base)

  url.pathname = "/" + pathname.join("/")

  return url.toString()
}