/* SPDX-License-Identifier: GPL-3.0-or-later
 * Copyright © 2023 The TokTok team.
 */

/**
 * Functions for the network profile.
 */

#include "net_profile.h"

#include <stdint.h>

#include "attributes.h"
#include "ccompat.h"

#define NETPROF_TCP_DATA_PACKET_ID 0x10

/** Returns the number of sent or received packets for all ID's between `start_id` and `end_id`. */
nullable(1)
static uint64_t netprof_get_packet_count_id_range(const Net_Profile *profile, uint8_t start_id, uint8_t end_id,
        Packet_Direction dir)
{
    if (profile == nullptr) {
        return 0;
    }

    const uint64_t *arr = dir == PACKET_DIRECTION_SENT ? profile->packets_sent : profile->packets_recv;
    uint64_t count = 0;

    for (size_t i = start_id; i <= end_id; ++i) {
        count += arr[i];
    }

    return count;
}

/** Returns the number of sent or received bytes for all ID's between `start_id` and `end_id`. */
nullable(1)
static uint64_t netprof_get_bytes_id_range(const Net_Profile *profile, uint8_t start_id, uint8_t end_id,
        Packet_Direction dir)
{
    if (profile == nullptr) {
        return 0;
    }

    const uint64_t *arr = dir == PACKET_DIRECTION_SENT ? profile->bytes_sent : profile->bytes_recv;
    uint64_t bytes = 0;

    for (size_t i = start_id; i <= end_id; ++i) {
        bytes += arr[i];
    }

    return bytes;
}

void netprof_record_packet(Net_Profile *profile, uint8_t id, size_t length, Packet_Direction dir)
{
    if (profile == nullptr) {
        return;
    }

    if (dir == PACKET_DIRECTION_SENT) {
        ++profile->total_packets_sent;
        ++profile->packets_sent[id];

        profile->total_bytes_sent += length;
        profile->bytes_sent[id] += length;
    } else {
        ++profile->total_packets_recv;
        ++profile->packets_recv[id];

        profile->total_bytes_recv += length;
        profile->bytes_recv[id] += length;
    }
}

uint64_t netprof_get_packet_count_id(const Net_Profile *profile, uint8_t id, Packet_Direction dir)
{
    if (profile == nullptr) {
        return 0;
    }

    // Special case - TCP data packets can have any ID between 0x10 and 0xff
    if (id == NETPROF_TCP_DATA_PACKET_ID) {
        return netprof_get_packet_count_id_range(profile, id, UINT8_MAX, dir);
    }

    return dir == PACKET_DIRECTION_SENT ? profile->packets_sent[id] : profile->packets_recv[id];
}

uint64_t netprof_get_packet_count_total(const Net_Profile *profile, Packet_Direction dir)
{
    if (profile == nullptr) {
        return 0;
    }

    return dir == PACKET_DIRECTION_SENT ? profile->total_packets_sent : profile->total_packets_recv;
}

uint64_t netprof_get_bytes_id(const Net_Profile *profile, uint8_t id, Packet_Direction dir)
{
    if (profile == nullptr) {
        return 0;
    }

    // Special case - TCP data packets can have any ID between 0x10 and 0xff
    if (id == NETPROF_TCP_DATA_PACKET_ID) {
        return netprof_get_bytes_id_range(profile, id, 0xff, dir);
    }

    return dir == PACKET_DIRECTION_SENT ? profile->bytes_sent[id] : profile->bytes_recv[id];
}

uint64_t netprof_get_bytes_total(const Net_Profile *profile, Packet_Direction dir)
{
    if (profile == nullptr) {
        return 0;
    }

    return dir == PACKET_DIRECTION_SENT ? profile->total_bytes_sent : profile->total_bytes_recv;
}