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

const router = Router()

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

    const response = await axios.get(`${host}/api/v1/node`, {
      headers: { Authorization: `Bearer ${key.trim()}` },
    })

    type HsNode = {
      id: string
      name: string
      ipAddresses: string[]
      online: boolean
      lastSeen: string
      user?: { name: string }
    }

    const nodes: HsNode[] = response.data?.nodes ?? []

    res.json({
      total:  nodes.length,
      online: nodes.filter(n => n.online).length,
      nodes:  nodes.map(n => ({
        id:        n.id,
        name:      n.name,
        ip:        n.ipAddresses?.[0] ?? '',
        online:    n.online,
        lastSeen:  n.lastSeen,
        user:      n.user?.name ?? '',
      })),
    })
  } catch (err: unknown) {
    const msg = err instanceof Error ? err.message : 'Unknown error'
    res.status(500).json({ error: msg })
  }
})

export default router