const { findDienst, getPngFilePaths } = require('./dienstService')
const { sendTextMessage, sendImageMessage, notifyAdmin } = require('./whatsappApi')

const BOT_NAME = (process.env.BOT_NAME || 'EdGpt').toLowerCase()
const ALLOWED_GROUP = process.env.ALLOWED_GROUP

function extractDienstnummer(body) {
  const match = body.match(/\b(\d{4})\b/)
  return match ? match[1] : null
}

function isBotMentioned(message) {
  if (message._data?.mentionedJidList?.length > 0) {
    return true
  }
  if (message.body) {
    const normalized = message.body.toLowerCase().replace(/\s+/g, '')
    if (normalized.includes(`@${BOT_NAME.replace(/\s+/g, '')}`)) {
      return true
    }
  }
  return false
}

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 (message.from !== ALLOWED_GROUP) return
  if (!isBotMentioned(message)) return

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

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

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

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

  const pngPaths = getPngFilePaths(dienst)
  if (!pngPaths || pngPaths.length === 0) {
    await sendTextMessage(author, `Geen pagina's gevonden voor dienst ${dienstnummer}.`)
    return
  }

  for (const pngPath of pngPaths) {
    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 }