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#ifndef _WEBSERVERINTERFACE_HPP
#define _WEBSERVERINTERFACE_HPP

#include <string>

/// The message type descibed by the POST.
enum PostEvent
{
  SensorDataEvent, ///< Adding sensor data to the log.
  InvalidSensorEvent ///< Reporting an invalid sensor node.
};

namespace mbed { class Serial; }
class ESP8266;
class ISha256MacCoprocessor;
struct SensorData;

/// Network interface to the web server supporting authenticated posting of event
/// through an HTTP challenge-respones scheme with SHA-256 data signing.
class WebServerInterface
{
public:
   /// Session ID used by the web server to distinguish between multiple Controllers.
  std::string sessionId;
  
  /// @param esp8266 Interface to ESP8266 for Wi-Fi access.
  /// @param pc Optional serial interface for received web traffic.
  WebServerInterface(ESP8266 & esp8266, mbed::Serial * pc = NULL);
  
  /// Initialize network interface and connect to access point.
  /// @returns True on success.
  bool initialize();
  
  /// Send an authenticated event message to the web server.
  /// @param macCoProc Coprocessor such as the DS2465 used to calculate the authentication MAC.
  /// @param event Event message type.
  /// @postData Message body as determined by the event message type.
  /// @setSecret True if the Transport Secret needs to be selected in the coprocessor.
  /// @returns True on success.
  bool authPostHttpEvent(ISha256MacCoprocessor & macCoproc, PostEvent event, const std::string & postData, bool setSecret);
  
  /// Format sensor data as text suitable for use in a POST body.
  /// @param sensorData Sensor data to format.
  /// @returns Data formatted for web server.
  static std::string formatSensorDataPostBody(const SensorData & sensorData); 
 
private:
  /// @{
  /// Configuration strings.
  static const char wifiSsid[];
  static const char wifiPassword[];
  static const char serverAddress[];
  static const unsigned int serverPort;
  static const char serverPostPath[];
  static const char serverChallengePath[];
  /// @}
  
  ESP8266 & esp8266;
  mbed::Serial * pc;
};

#endif