#ifndef ARQ_H
#define ARQ_H

#ifdef __cplusplus
extern "C" {
#endif

#include <stdbool.h>
#include <inttypes.h>

#include "framing.h"


typedef enum {
  RECEIVED = 0, //mesage received (received message given in event handler)
  SEND_SUCCESS = 1, //mesage was successfully sent (message sent given in event handler)
  NO_ACK = 3, //no ack was received for given message (message sent given in event handler)
  SIZE_ERROR = 5, //the message being sent is too large (message trying to be sent given in event handler)
  BUSY = 6 //a message has already been sent and an ack is awaited (message trying to be sent given in event handler)
} message_event;

typedef void (*send_frame_function)(int16_t size, uint8_t* data);
typedef void (*message_event_function)(message_event e, int16_t size, const uint8_t* const message);
typedef void (*void_function)();

typedef struct {
  uint8_t last_sent_buffer[MAX_FRAME_SIZE];
  int16_t last_sent_size;
  uint8_t last_received_seq;
  uint8_t resends;
  bool awaiting_ack;
  
  send_frame_function sender;
  message_event_function event_handler;
  void_function start_timer;
  void_function stop_timer;
  
} arq;

void init_arq(arq* a);
void receive_frame(arq* a, int16_t size, uint8_t* data);
void timeout(arq* a);
void send_message(arq* a, int16_t size, const uint8_t * const message);



#ifdef __cplusplus
} // extern "C"
#endif

#endif /* ARQ_H */