feat: add core modules - dienstService, whatsappApi, messageHandler, webhook server

src/dienstService.js

@@ -0,0 +1,24 @@
+const fs = require('fs')
+const path = require('path')
+
+let dienstenCache = null
+
+function loadDiensten() {
+  if (dienstenCache) return dienstenCache
+  const jsonPath = process.env.DIENSTEN_JSON
+  const raw = fs.readFileSync(jsonPath, 'utf-8')
+  dienstenCache = JSON.parse(raw)
+  return dienstenCache
+}
+
+function findDienst(dienstnummer) {
+  const diensten = loadDiensten()
+  return diensten.find(d => d.dienstnummer === dienstnummer) || null
+}
+
+function getPngFilePaths(dienst) {
+  const pngDir = process.env.DIENSTEN_PNG
+  return dienst.paginas.map(p => path.join(pngDir, p.bestandsnaam))
+}
+
+module.exports = { loadDiensten, findDienst, getPngFilePaths }