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

const router = Router()

router.get('/stats', async (_req, res) => {
  try {
    const host = process.env.ADGUARD_HOST
    const user = process.env.ADGUARD_USER
    const pass = process.env.ADGUARD_PASSWORD
    if (!host) {
      res.status(503).json({ error: 'ADGUARD_HOST not configured' })
      return
    }

    const u = user?.trim() ?? ''
    const p = pass?.trim() ?? ''
    const b64 = Buffer.from(`${u}:${p}`).toString('base64')
    const statsRes = await axios.get(`${host}/control/stats`, {
      headers: {
        Authorization: `Basic ${b64}`,
        'User-Agent': 'Mozilla/5.0',
      },
      maxRedirects: 0,
    })

    const d = statsRes.data
    const queries: number[]       = d.dns_queries       ?? []
    const blocked: number[]       = d.blocked_filtering ?? []
    const total: number           = d.num_dns_queries       ?? 0
    const totalBlocked: number    = d.num_blocked_filtering ?? 0

    const timeSlots = queries.map((q, i) => ({ queries: q, blocked: blocked[i] ?? 0 }))

    res.json({
      totalQueries:   total,
      blockedQueries: totalBlocked,
      blockedPercent: total > 0 ? ((totalBlocked / total) * 100).toFixed(1) : '0.0',
      timeSlots,
    })
  } catch (err: unknown) {
    const msg = err instanceof Error ? err.message : 'Unknown error'
    res.status(500).json({ error: msg })
  }
})

export default router