packet.h

#ifndef PRRT_FRAME_H
#define PRRT_FRAME_H

#include <stdint.h>
#include "../../util/pipe.h"
#include "../codingParams.h"
#include <stdbool.h>


typedef enum {
    PACKET_TYPE_DATA = 0,
    PACKET_TYPE_REPETITION = 1,
    PACKET_TYPE_REDUNDANCY = 2,
    PACKET_TYPE_FEEDBACK = 3,
    PACKET_TYPE_PRESENT_REDUNDANCY = 4,
    PACKET_TYPE_CHANNEL_FEEDBACK = 5
} prrtPacketType_t;

typedef uint16_t prrtSequenceNumber_t;
typedef uint8_t prrtIndex_t;
typedef uint32_t prrtTimestamp_t; // microsecond
typedef uint32_t prrtTimedelta_t; // microsecond
typedef int32_t prrtTimeDifference_t; // microsecond
typedef uint32_t prrtPacketLength_t; // bytes
typedef float prrtPacketLossRate_t;
typedef uint32_t prrtDeliveryRate_t; // bits per second
typedef uint32_t prrtByteCount_t;


typedef struct prrtIncompleteBlock {
    prrtSequenceNumber_t sequenceNumberBase;
    uint16_t repairCycleIndex;
} PrrtIncompleteBlock;

typedef struct prrtPacket {
    ListNode asListNode;
    uint8_t type_priority;
    prrtIndex_t index;
    prrtSequenceNumber_t sequenceNumber;
    void *payload;
    prrtPacketLength_t payloadLength;

    // Packet State field that are not put into the packet on the wire
    prrtByteCount_t delivered;
    prrtTimestamp_t delivered_time;
    prrtTimestamp_t first_sent_time;
    bool is_app_limited;
    prrtTimestamp_t sent_time;
    prrtTimedelta_t rtt;
} PrrtPacket;
#define PRRT_PACKET_GENERAL_HEADER_SIZE 8
#define PRRT_PACKET_ENCODED_GENERAL_HEADER_LENGTH 4

typedef struct prrtPacketDataPayload {
    prrtPacketLength_t dataLength;
    prrtTimestamp_t timestamp;
    prrtTimedelta_t groupRTprop_us;
    prrtTimestamp_t packetTimeout_us;
} PrrtPacketDataPayload;
#define PRRT_PACKET_DATA_HEADER_SIZE sizeof(PrrtPacketDataPayload)

typedef struct prrtPacketRedundancyPayload {
    prrtSequenceNumber_t baseSequenceNumber;
    prrtTimestamp_t timestamp;
    uint8_t n;
    uint8_t k;
} PrrtPacketRedundancyPayload;
#define PRRT_PACKET_REDUNDANCY_HEADER_SIZE sizeof(PrrtPacketRedundancyPayload)

typedef struct prrtPacketFeedbackPayload {
    prrtTimedelta_t groupRTT_us;
    prrtTimestamp_t forwardTripTimestamp_us;
    prrtSequenceNumber_t erasureCount;
    prrtSequenceNumber_t packetCount;
    prrtSequenceNumber_t gapLength;
    prrtSequenceNumber_t gapCount;
    prrtSequenceNumber_t burstLength;
    prrtSequenceNumber_t burstCount;
    prrtSequenceNumber_t ackSequenceNumber;
    prrtPacketType_t ackPacketType;
    PrrtIncompleteBlock *incompleteBlocks;
} PrrtPacketFeedbackPayload;
#define PRRT_PACKET_FEEDBACK_HEADER_SIZE (sizeof(PrrtPacketFeedbackPayload) - sizeof(PrrtIncompleteBlock*))

prrtPacketType_t PrrtPacket_type(PrrtPacket *packet_ptr);

uint8_t PrrtPacket_priority(PrrtPacket *packet_ptr);

prrtPacketLength_t PrrtPacket_size(PrrtPacket *packet_ptr);

int PrrtPacket_print(PrrtPacket *packet_ptr);

PrrtPacket *PrrtPacket_copy(PrrtPacket *original);

PrrtPacket *PrrtPacket_create_data_packet(uint8_t priority, const void *payloadPointer,
                                          prrtPacketLength_t dataLength, prrtSequenceNumber_t sequenceNumber,
                                          prrtTimedelta_t targetDelay);

PrrtPacket *PrrtPacket_reconstruct_data_packet(PrrtPacketDataPayload *payload, prrtIndex_t index,
                                               prrtSequenceNumber_t sequenceNumber);

PrrtPacket *
PrrtPacket_create_feedback_packet(uint8_t priority, prrtSequenceNumber_t sequenceNumber, prrtTimedelta_t groupRTT,
                                  prrtSequenceNumber_t gapLength, prrtSequenceNumber_t gapCount,
                                  prrtSequenceNumber_t burstLength, prrtSequenceNumber_t burstCount,
                                  prrtTimestamp_t forwardTripTime, prrtSequenceNumber_t erasureCount,
                                  prrtSequenceNumber_t packetCount, prrtSequenceNumber_t ackSequenceNumber,
                                  prrtPacketType_t ackPacketType);

PrrtPacket *PrrtPacket_create_redundancy_packet(uint8_t priority, void *payloadPointer,
                                                prrtPacketLength_t payloadLength,
                                                prrtSequenceNumber_t sequenceNumber, uint8_t index,
                                                prrtSequenceNumber_t baseSequenceNumber,
                                                PrrtCodingParams *codingParams);

bool PrrtPacket_decode(void *srcBuffer, uint16_t srcBufferSize, PrrtPacket *targetPacket);

bool PrrtPacket_encode(void *buf_ptr, uint16_t buf_size, PrrtPacket *packet_ptr);

int PrrtPacket_destroy(PrrtPacket *packet);

#define PrrtPacket_copy_payload_to_buffer(dst, packet, header_size) memcpy(dst, (packet)->payload + (header_size), (packet)->payloadLength - (header_size));
#define PrrtPacket_copy_buffer_to_payload(packet, src, header_size) memcpy((packet)->payload + (header_size), src, (packet)->payloadLength - (header_size));

#define PrrtPacket_get_data_timestamp(packet) ((PrrtPacketDataPayload*) packet->payload)->timestamp;
#define PrrtPacket_get_redundancy_timestamp(packet) ((PrrtPacketRedundancyPayload*) packet->payload)->timestamp;

#define PrrtPacket_byListNode(lnptr) ((PrrtPacket *) (lnptr))

#define PrrtDataPacket_packet_timeout(packet) ((PrrtPacketDataPayload*) (packet)->payload)->packetTimeout_us

#endif //PRRT_FRAME_H