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

const router = Router()

let cachedSid: string | null = null
let sidExpiry = 0

async function getSid(): Promise<string> {
  if (cachedSid && Date.now() < sidExpiry) return cachedSid

  const host = process.env.SYNOLOGY_HOST
  const res = await axios.get(`${host}/webapi/auth.cgi`, {
    params: {
      api: 'SYNO.API.Auth',
      version: 3,
      method: 'login',
      account: process.env.SYNOLOGY_USER,
      passwd: process.env.SYNOLOGY_PASSWORD,
      session: 'dashboard',
      format: 'sid',
    },
  })

  if (!res.data.success) throw new Error(`Synology login failed: ${JSON.stringify(res.data.error)}`)

  cachedSid = res.data.data.sid as string
  sidExpiry = Date.now() + 20 * 60 * 1000
  return cachedSid
}

router.get('/storage', async (_req, res) => {
  try {
    const host = process.env.SYNOLOGY_HOST
    if (!host) {
      res.status(503).json({ error: 'SYNOLOGY_HOST not configured' })
      return
    }

    const sid = await getSid()

    const storageRes = await axios.get(`${host}/webapi/entry.cgi`, {
      params: {
        api: 'SYNO.Storage.CGI.Storage',
        version: 1,
        method: 'load_info',
        _sid: sid,
      },
    })

    if (!storageRes.data.success) {
      cachedSid = null
      throw new Error(`Synology storage error: ${JSON.stringify(storageRes.data.error)}`)
    }

    const d = storageRes.data.data
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    const volumes: any[] = d?.volumes ?? d?.vol_info ?? d?.storage?.volumes ?? []

    res.json({
      volumes: volumes.map(v => ({
        id:    v.vol_path ?? v.volume_path ?? v.id,
        label: v.vol_path ?? v.display_name ?? v.id,
        // DSM 7: sizes live under v.size.{total,used}
        used:  Number(v.size?.used  ?? v.size_used  ?? 0),
        total: Number(v.size?.total ?? v.size_total ?? 0),
      })),
    })
  } catch (err: unknown) {
    if (err instanceof Error && err.message.includes('login failed')) cachedSid = null
    const msg = err instanceof Error ? err.message : 'Unknown error'
    res.status(500).json({ error: msg })
  }
})

router.get('/info', async (_req, res) => {
  try {
    const host = process.env.SYNOLOGY_HOST
    if (!host) { res.status(503).json({ error: 'SYNOLOGY_HOST not configured' }); return }

    const sid = await getSid()

    const r = await axios.get(`${host}/webapi/entry.cgi`, {
      params: { api: 'SYNO.DSM.Info', version: 2, method: 'getinfo', _sid: sid },
    })

    if (!r.data.success) throw new Error(`DSM info error: ${JSON.stringify(r.data.error)}`)

    const d = r.data.data ?? {}
    res.json({
      model:       d.model        ?? '',
      dsmVersion:  d.version      ?? '',
      uptime:      Number(d.uptime ?? 0),
      temperature: d.temperature  != null ? Number(d.temperature) : null,
    })
  } catch (err: unknown) {
    if (err instanceof Error && err.message.includes('login failed')) cachedSid = null
    const msg = err instanceof Error ? err.message : 'Unknown error'
    res.status(500).json({ error: msg })
  }
})

export default router