import { Router } from 'express'
import axios from 'axios'
import crypto from 'crypto'

const router = Router()

let cachedToken: string | null = null
let tokenExpiry = 0
let tokenPromise: Promise<string> | null = null

async function getToken(host: string, user: string, pass: string): Promise<string> {
  if (cachedToken && Date.now() < tokenExpiry) return cachedToken
  // Deduplicate concurrent login attempts
  if (tokenPromise) return tokenPromise
  tokenPromise = axios.post(`${host}/auth/login`, { username: user, password: pass })
    .then(res => {
      cachedToken = res.data.token
      tokenExpiry = Date.now() + 55 * 60 * 1000
      tokenPromise = null
      return cachedToken!
    })
    .catch(err => {
      tokenPromise = null
      throw err
    })
  return tokenPromise
}

router.get('/status', async (_req, res) => {
  const host = process.env.NAVIDROME_HOST
  const user = process.env.NAVIDROME_USER
  const pass = process.env.NAVIDROME_PASSWORD
  if (!host || !user || !pass)
    return res.status(503).json({ error: 'Navidrome not configured' })

  try {
    const jwtToken = await getToken(host, user, pass)
    const headers = { 'X-ND-Authorization': `Bearer ${jwtToken}` }

    // Use Subsonic API for now playing (standard endpoint)
    const salt      = 'sycoDash'
    const md5Token  = crypto.createHash('md5').update(pass + salt).digest('hex')
    const subParams = { u: user, t: md5Token, s: salt, v: '1.16.1', c: 'syco-dashboard', f: 'json' }

    const [artistRes, albumRes, songRes, nowPlayingRes] = await Promise.all([
      axios.get(`${host}/api/artist`, { headers, params: { _start: 0, _end: 1 } }),
      axios.get(`${host}/api/album`,  { headers, params: { _start: 0, _end: 1 } }),
      axios.get(`${host}/api/song`,   { headers, params: { _start: 0, _end: 1 } }),
      axios.get(`${host}/rest/getNowPlaying.view`, { params: subParams }).catch(() => null),
    ])

    const artistCount = Number(artistRes.headers['x-total-count'] ?? 0)
    const albumCount  = Number(albumRes.headers['x-total-count']  ?? 0)
    const songCount   = Number(songRes.headers['x-total-count']   ?? 0)

    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    const nowPlayingEntries: any[] = nowPlayingRes?.data?.['subsonic-response']?.nowPlaying?.entry ?? []
    const entries = Array.isArray(nowPlayingEntries) ? nowPlayingEntries : [nowPlayingEntries]
    const nowPlaying = entries.filter(Boolean).map((e: any) => ({
      user:   e.username ?? 'Unknown',
      title:  e.title   ?? '',
      artist: e.artist  ?? '',
      album:  e.album   ?? '',
    }))

    res.json({ artistCount, albumCount, songCount, nowPlaying })
  } catch (err: any) {
    res.status(502).json({ error: err.message ?? 'Navidrome error' })
  }
})

export default router