require('dotenv').config()
const express = require('express')
const axios = require('axios')

const BOT_TOKEN = process.env.TELEGRAM_BOT_TOKEN
const ADMIN_CHAT_ID = process.env.TELEGRAM_ADMIN_CHAT_ID
const PORT = process.env.TELEGRAM_BOT_PORT || 3004
const DIENST_BOT_HEALTH = process.env.DIENST_BOT_HEALTH_URL || 'http://localhost:3002/health'
const WWEBJS_SESSION = process.env.WWEBJS_API_SESSION_URL || 'http://192.168.5.252:3001/session/status/EdGpt'
const CHECK_INTERVAL = parseInt(process.env.HEALTH_CHECK_INTERVAL_MS || '300000', 10)

const app = express()
app.use(express.json())

let dienstBotOk = true
let wwebjsOk = true

function sendTelegram(text) {
  return axios.post(`https://api.telegram.org/bot${BOT_TOKEN}/sendMessage`, {
    chat_id: ADMIN_CHAT_ID,
    text,
    parse_mode: 'Markdown'
  }, { timeout: 10000 })
}

async function startupNotification() {
  try {
    await sendTelegram('✅ Telegram watchdog online — gezondheidschecks actief')
    console.log('Startup notification sent')
  } catch (err) {
    console.error('Failed to send startup notification:', err.message)
  }
}

async function checkHealth() {
  let currentDienstBotOk = true
  let currentWwebjsOk = true

  try {
    await axios.get(DIENST_BOT_HEALTH, { timeout: 5000 })
  } catch {
    currentDienstBotOk = false
  }

  try {
    const res = await axios.get(WWEBJS_SESSION, { timeout: 5000 })
    currentWwebjsOk = res.data?.state === 'CONNECTED'
  } catch {
    currentWwebjsOk = false
  }

  if (dienstBotOk !== currentDienstBotOk) {
    const icon = currentDienstBotOk ? '✅' : '❌'
    const status = currentDienstBotOk ? 'weer online' : 'niet bereikbaar'
    try {
      await sendTelegram(`${icon} dienst-bot ${status}`)
    } catch (err) {
      console.error('Failed to send dienst-bot status:', err.message)
    }
    dienstBotOk = currentDienstBotOk
  }

  if (wwebjsOk !== currentWwebjsOk) {
    const icon = currentWwebjsOk ? '✅' : '❌'
    const status = currentWwebjsOk ? 'weer online' : 'niet bereikbaar'
    try {
      await sendTelegram(`${icon} wwebjs-api ${status}`)
    } catch (err) {
      console.error('Failed to send wwebjs-api status:', err.message)
    }
    wwebjsOk = currentWwebjsOk
  }

  console.log(`Health check: dienst-bot=${currentDienstBotOk ? 'UP' : 'DOWN'}, wwebjs-api=${currentWwebjsOk ? 'UP' : 'DOWN'}`)
}

app.post('/notify', async (req, res) => {
  const { text } = req.body
  if (!text) {
    return res.status(400).json({ success: false, error: 'missing text' })
  }
  try {
    await sendTelegram(`⚠️ ${text}`)
    res.json({ success: true })
  } catch (err) {
    console.error('Failed to forward notification:', err.message)
    res.status(500).json({ success: false, error: err.message })
  }
})

app.get('/health', (req, res) => {
  res.json({ status: 'ok', services: { dienstBot: dienstBotOk, wwebjsApi: wwebjsOk } })
})

startupNotification()
setInterval(checkHealth, CHECK_INTERVAL)
checkHealth()

app.listen(PORT, () => {
  console.log(`telegram-bot listening on port ${PORT}`)
})