import { Client, GatewayIntentBits } from "discord.js";
import crypto from "crypto";
import { existsSync, readFileSync, writeFileSync } from "fs";

/* ================= CONFIG ================= */
const REFRESH_MS = Number(process.env.REFRESH_MS ?? 15_000);
const STATE_FILE = "./state.json";

/* ================= DISCORD ================= */
const client = new Client({
  intents: [GatewayIntentBits.Guilds],
});

/* ================= STATE ================= */
let messageId = null;
let lastSignature = null;

if (existsSync(STATE_FILE)) {
  try {
    const state = JSON.parse(readFileSync(STATE_FILE, "utf8"));
    messageId = state.messageId ?? null;
    lastSignature = state.lastSignature ?? null;
  } catch {}
}

function saveState() {
  writeFileSync(
    STATE_FILE,
    JSON.stringify({ messageId, lastSignature }, null, 2)
  );
}

/* ================= NAVIDROME AUTH ================= */
function navidromeAuth() {
  const salt = crypto.randomBytes(6).toString("hex");
  const token = crypto
    .createHash("md5")
    .update(process.env.NAVIDROME_PASS + salt)
    .digest("hex");

  return { salt, token };
}

function nowPlayingUrl() {
  const { salt, token } = navidromeAuth();
  return `${process.env.NAVIDROME_URL}/rest/getNowPlaying` +
    `?u=${process.env.NAVIDROME_USER}` +
    `&t=${token}&s=${salt}&f=json&v=1.16.1&c=discord-bot`;
}

function coverFetchUrl(id) {
  const { salt, token } = navidromeAuth();
  return `${process.env.NAVIDROME_URL}/rest/getCoverArt` +
    `?u=${process.env.NAVIDROME_USER}` +
    `&t=${token}&s=${salt}&v=1.16.1&c=discord-bot` +
    `&id=${id}&size=96`;
}

/* ================= UTIL ================= */
function colorFromString(str) {
  let hash = 0;
  for (const c of str) hash = (hash << 5) - hash + c.charCodeAt(0);
  return Math.abs(hash) % 0xffffff;
}

function signature(entries) {
  return entries
    .map(e => `${e.username}:${e.id}:${e.minutesAgo ?? 0}`)
    .join("|");
}

/* ================= NAVIDROME ================= */
async function getNowPlaying() {
  const res = await fetch(nowPlayingUrl());
  if (!res.ok) throw new Error("Failed to fetch now playing");

  const json = await res.json();
  return json["subsonic-response"].nowPlaying?.entry ?? [];
}

/* ================= MESSAGE BUILD ================= */
async function buildMessage(entries) {
  if (!entries.length) {
    return {
      embeds: [{
        title: "Nothing playing",
        description: "No active listeners",
        color: 0x808080,
      }],
      files: [],
    };
  }

  const embeds = [];
  const files = [];

  for (let i = 0; i < e
DISCORD_TOKEN="no.no"
LASTFM_API_KEY=no

NAVIDROME_URL=https://no.no.no
NAVIDROME_USER="no"
NAVIDROME_PASS="no"


SPOTIFY_CLIENT_ID="no"
SPOTIFY_CLIENT_SECRET="no"