const { findDienst, getPngFilePaths } = require('./dienstService')
const { sendTextMessage, sendImageMessage, notifyAdmin, sendChatSeen } = require('./whatsappApi')
const { checkLimit, increment, MAX_REQUESTS_PER_DAY } = require('./rateLimiter')
const { increment: incrementDaily } = require('./dailyStats')

const ALLOWED_GROUP = process.env.ALLOWED_GROUP
const ALLOWED_GROUP_NAMES = (process.env.ALLOWED_GROUP_NAME || '')
  .split(',')
  .map(name => name.trim())
  .filter(Boolean)
const ALLOWED_CHAT_IDS = new Set([ALLOWED_GROUP, ...ALLOWED_GROUP_NAMES].filter(Boolean))

function normalizeChatId(chatId) {
  return (chatId || '')
    .replace(/^\u200e/, '')
    .replace(/\s*\(\d+ berichten?\)$/, '')
    .trim()
}

function extractDienstnummer(body) {
  const match = body.match(/^\s*(\d{4,5})\s*$/)
  return match ? match[1] : null
}

async function handleWebhook(payload) {
  if (payload.dataType !== 'message') return
  if (payload.sessionId !== process.env.WHATSAPP_SESSION) return

  const message = payload.data?.message
  if (!message) return
  if (message.fromMe) return
  if (!ALLOWED_CHAT_IDS.has(normalizeChatId(message.from))) return

  const dienstnummer = extractDienstnummer(message.body || '')
  if (!dienstnummer) return

  incrementDaily()

  sendChatSeen(ALLOWED_GROUP).catch(err =>
    console.error('Failed to mark chat as seen:', err.message)
  )

  console.log(`Processing dienst ${dienstnummer} for ${message.author}`)

  const author = message.author || message.from
  if (!author) return

  const limit = checkLimit(author)
  if (!limit.allowed) {
    await sendTextMessage(author, `Je hebt vandaag het maximum van ${limit.max} diensten bereikt. Probeer het morgen opnieuw.`)
    console.log(`Rate limit reached for ${author} (${limit.count}/${limit.max})`)
    return
  }

  increment(author)

  const dienst = findDienst(dienstnummer)
  if (!dienst) {
    await sendTextMessage(author, `Dienstnummer ${dienstnummer} niet gevonden.`)
    return
  }

  // Media-pacing voor opeenvolgende sends gebeurt bridge-breed (wwebjs-api
  // serialiseert + throttle de media-sends; MEDIA_SEND_DELAY_MS in bridge-.env).
  const pngPaths = getPngFilePaths(dienst)
  if (!pngPaths || pngPaths.length === 0) {
    await sendTextMessage(author, `Geen pagina's gevonden voor dienst ${dienstnummer}.`)
    return
  }

  for (let i = 0; i < pngPaths.length; i++) {
    const pngPath = pngPaths[i]
    const filename = pngPath.split('/').pop()
    try {
      await sendImageMessage(author, pngPath, filename)
    } catch (err) {
      const errorMsg = `Fout bij verzenden ${filename} naar ${author}: ${err.message}`
      console.error(errorMsg)
      await notifyAdmin(errorMsg)
    }
  }
}

module.exports = { handleWebhook, extractDienstnummer }