// Read File from SPIFFS
String readFile(fs::FS &fs, const char * path){
  Serial.printf("Reading file: %s\r\n", path);

  File file = fs.open(path);
  if(!file || file.isDirectory()){
    Serial.println("- failed to open file for reading");
    return String();
  }
  
  String fileContent;
  while(file.available()){
    fileContent = file.readStringUntil('\n');
    break;     
  }
  return fileContent;
}

// Write file to SPIFFS
void writeFile(fs::FS &fs, const char * path, const char * message){
  Serial.printf("Writing file: %s\r\n", path);

  File file = fs.open(path, FILE_WRITE);
  if(!file){
    Serial.println("- failed to open file for writing");
    return;
  }
  if(file.print(message)){
    Serial.println("- file written");
  } else {
    Serial.println("- frite failed");
  }
}

//returns all key/value pairs with the parameter "all" or just the value of the parameter key.
String getCurrentSavedData(const char* data, String key){
  File file = SPIFFS.open(data, "r");
  if (!file) {
    throw std::runtime_error("File not found");
  }
  
  String json = file.readString();
  file.close();
 
  StaticJsonDocument<200> jsonDoc;  // create a JSON document with a capacity of 200 bytes
  deserializeJson(jsonDoc, json);  // parse the JSON data and store it in the JsonDocument
  
  if(key == "all"){
    return json; 
  } else{
    if(jsonDoc[key] == nullptr){
      return "";
    } 
    else return jsonDoc[key];
  }
}