#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>

#include "log.h"
#include "stellar_stat.h"
#include "fieldstat/fieldstat_easy.h"
#include "fieldstat/fieldstat_exporter.h"

#define STAT_LOG_ERROR(format, ...) LOG_ERROR("stat", format, ##__VA_ARGS__)

#define IS_FREE 0
#define IS_BUSY 0xf

typedef uint64_t get_val_func(struct thread_stat *thr_stat);
static inline uint64_t get_pkts_rx(struct thread_stat *thr_stat) { return thr_stat->packet_io->pkts_rx; }
static inline uint64_t get_bytes_rx(struct thread_stat *thr_stat) { return thr_stat->packet_io->bytes_rx; }
static inline uint64_t get_pkts_tx(struct thread_stat *thr_stat) { return thr_stat->packet_io->pkts_tx; }
static inline uint64_t get_bytes_tx(struct thread_stat *thr_stat) { return thr_stat->packet_io->bytes_tx; }
static inline uint64_t get_keep_alive_pkts(struct thread_stat *thr_stat) { return thr_stat->packet_io->keep_alive_pkts; }
static inline uint64_t get_keep_alive_bytes(struct thread_stat *thr_stat) { return thr_stat->packet_io->keep_alive_bytes; }
static inline uint64_t get_raw_pkts_rx(struct thread_stat *thr_stat) { return thr_stat->packet_io->raw_pkts_rx; }
static inline uint64_t get_raw_bytes_rx(struct thread_stat *thr_stat) { return thr_stat->packet_io->raw_bytes_rx; }
static inline uint64_t get_raw_pkts_tx(struct thread_stat *thr_stat) { return thr_stat->packet_io->raw_pkts_tx; }
static inline uint64_t get_raw_bytes_tx(struct thread_stat *thr_stat) { return thr_stat->packet_io->raw_bytes_tx; }
static inline uint64_t get_pkts_dropped(struct thread_stat *thr_stat) { return thr_stat->packet_io->pkts_dropped; }
static inline uint64_t get_bytes_dropped(struct thread_stat *thr_stat) { return thr_stat->packet_io->bytes_dropped; }
static inline uint64_t get_pkts_injected(struct thread_stat *thr_stat) { return thr_stat->packet_io->pkts_injected; }
static inline uint64_t get_bytes_injected(struct thread_stat *thr_stat) { return thr_stat->packet_io->bytes_injected; }
static inline uint64_t get_ctrl_pkts_rx(struct thread_stat *thr_stat) { return thr_stat->packet_io->ctrl_pkts_rx; }
static inline uint64_t get_ctrl_bytes_rx(struct thread_stat *thr_stat) { return thr_stat->packet_io->ctrl_bytes_rx; }
static inline uint64_t get_ctrl_pkts_tx(struct thread_stat *thr_stat) { return thr_stat->packet_io->ctrl_pkts_tx; }
static inline uint64_t get_ctrl_bytes_tx(struct thread_stat *thr_stat) { return thr_stat->packet_io->ctrl_bytes_tx; }
static inline uint64_t get_ip4_flow_find(struct thread_stat *thr_stat) { return thr_stat->ip_reassembly->ip4_flow_find; }
static inline uint64_t get_ip4_flow_add(struct thread_stat *thr_stat) { return thr_stat->ip_reassembly->ip4_flow_add; }
static inline uint64_t get_ip4_flow_del(struct thread_stat *thr_stat) { return thr_stat->ip_reassembly->ip4_flow_del; }
static inline uint64_t get_ip4_flow_timeout(struct thread_stat *thr_stat) { return thr_stat->ip_reassembly->ip4_flow_timeout; }
static inline uint64_t get_ip4_flow_fail_no_space(struct thread_stat *thr_stat) { return thr_stat->ip_reassembly->ip4_flow_fail_no_space; }
static inline uint64_t get_ip4_flow_fail_overlap(struct thread_stat *thr_stat) { return thr_stat->ip_reassembly->ip4_flow_fail_overlap; }
static inline uint64_t get_ip4_flow_fail_many_frag(struct thread_stat *thr_stat) { return thr_stat->ip_reassembly->ip4_flow_fail_many_frag; }
static inline uint64_t get_ip4_flow_fail_invalid_length(struct thread_stat *thr_stat) { return thr_stat->ip_reassembly->ip4_flow_fail_invalid_length; }
static inline uint64_t get_ip4_flow_bypass_dup_fist_frag(struct thread_stat *thr_stat) { return thr_stat->ip_reassembly->ip4_flow_bypass_dup_fist_frag; }
static inline uint64_t get_ip4_flow_bypass_dup_last_frag(struct thread_stat *thr_stat) { return thr_stat->ip_reassembly->ip4_flow_bypass_dup_last_frag; }
static inline uint64_t get_ip6_flow_find(struct thread_stat *thr_stat) { return thr_stat->ip_reassembly->ip6_flow_find; }
static inline uint64_t get_ip6_flow_add(struct thread_stat *thr_stat) { return thr_stat->ip_reassembly->ip6_flow_add; }
static inline uint64_t get_ip6_flow_del(struct thread_stat *thr_stat) { return thr_stat->ip_reassembly->ip6_flow_del; }
static inline uint64_t get_ip6_flow_timeout(struct thread_stat *thr_stat) { return thr_stat->ip_reassembly->ip6_flow_timeout; }
static inline uint64_t get_ip6_flow_fail_no_space(struct thread_stat *thr_stat) { return thr_stat->ip_reassembly->ip6_flow_fail_no_space; }
static inline uint64_t get_ip6_flow_fail_overlap(struct thread_stat *thr_stat) { return thr_stat->ip_reassembly->ip6_flow_fail_overlap; }
static inline uint64_t get_ip6_flow_fail_many_frag(struct thread_stat *thr_stat) { return thr_stat->ip_reassembly->ip6_flow_fail_many_frag; }
static inline uint64_t get_ip6_flow_fail_invalid_length(struct thread_stat *thr_stat) { return thr_stat->ip_reassembly->ip6_flow_fail_invalid_length; }
static inline uint64_t get_ip6_flow_bypass_dup_fist_frag(struct thread_stat *thr_stat) { return thr_stat->ip_reassembly->ip6_flow_bypass_dup_fist_frag; }
static inline uint64_t get_ip6_flow_bypass_dup_last_frag(struct thread_stat *thr_stat) { return thr_stat->ip_reassembly->ip6_flow_bypass_dup_last_frag; }
static inline uint64_t get_total_tcp_sess_used(struct thread_stat *thr_stat) { return thr_stat->session_mgr->total_tcp_sess_used; }
static inline uint64_t get_curr_tcp_sess_used(struct thread_stat *thr_stat) { return thr_stat->session_mgr->curr_tcp_sess_used; }
static inline uint64_t get_curr_tcp_sess_opening(struct thread_stat *thr_stat) { return thr_stat->session_mgr->curr_tcp_sess_opening; }
static inline uint64_t get_curr_tcp_sess_active(struct thread_stat *thr_stat) { return thr_stat->session_mgr->curr_tcp_sess_active; }
static inline uint64_t get_curr_tcp_sess_closing(struct thread_stat *thr_stat) { return thr_stat->session_mgr->curr_tcp_sess_closing; }
static inline uint64_t get_curr_tcp_sess_discard(struct thread_stat *thr_stat) { return thr_stat->session_mgr->curr_tcp_sess_discard; }
static inline uint64_t get_curr_tcp_sess_closed(struct thread_stat *thr_stat) { return thr_stat->session_mgr->curr_tcp_sess_closed; }
static inline uint64_t get_total_udp_sess_used(struct thread_stat *thr_stat) { return thr_stat->session_mgr->total_udp_sess_used; }
static inline uint64_t get_curr_udp_sess_used(struct thread_stat *thr_stat) { return thr_stat->session_mgr->curr_udp_sess_used; }
static inline uint64_t get_curr_udp_sess_opening(struct thread_stat *thr_stat) { return thr_stat->session_mgr->curr_udp_sess_opening; }
static inline uint64_t get_curr_udp_sess_active(struct thread_stat *thr_stat) { return thr_stat->session_mgr->curr_udp_sess_active; }
static inline uint64_t get_curr_udp_sess_closing(struct thread_stat *thr_stat) { return thr_stat->session_mgr->curr_udp_sess_closing; }
static inline uint64_t get_curr_udp_sess_discard(struct thread_stat *thr_stat) { return thr_stat->session_mgr->curr_udp_sess_discard; }
static inline uint64_t get_curr_udp_sess_closed(struct thread_stat *thr_stat) { return thr_stat->session_mgr->curr_udp_sess_closed; }
static inline uint64_t get_tcp_sess_evicted(struct thread_stat *thr_stat) { return thr_stat->session_mgr->tcp_sess_evicted; }
static inline uint64_t get_udp_sess_evicted(struct thread_stat *thr_stat) { return thr_stat->session_mgr->udp_sess_evicted; }
static inline uint64_t get_udp_pkts_nospace_bypass(struct thread_stat *thr_stat) { return thr_stat->session_mgr->udp_pkts_nospace_bypass; }
static inline uint64_t get_tcp_pkts_nospace_bypass(struct thread_stat *thr_stat) { return thr_stat->session_mgr->tcp_pkts_nospace_bypass; }
static inline uint64_t get_tcp_pkts_nosess_bypass(struct thread_stat *thr_stat) { return thr_stat->session_mgr->tcp_pkts_nosess_bypass; }
static inline uint64_t get_tcp_pkts_duped_bypass(struct thread_stat *thr_stat) { return thr_stat->session_mgr->tcp_pkts_duped_bypass; }
static inline uint64_t get_udp_pkts_duped_bypass(struct thread_stat *thr_stat) { return thr_stat->session_mgr->udp_pkts_duped_bypass; }
static inline uint64_t get_udp_pkts_evctd_bypass(struct thread_stat *thr_stat) { return thr_stat->session_mgr->udp_pkts_evctd_bypass; }
static inline uint64_t get_tcp_seg_received(struct thread_stat *thr_stat) { return thr_stat->session_mgr->tcp_seg_received; }
static inline uint64_t get_tcp_seg_expired(struct thread_stat *thr_stat) { return thr_stat->session_mgr->tcp_seg_expired; }
static inline uint64_t get_tcp_seg_retransmit(struct thread_stat *thr_stat) { return thr_stat->session_mgr->tcp_seg_retransmit; }
static inline uint64_t get_tcp_seg_overlap(struct thread_stat *thr_stat) { return thr_stat->session_mgr->tcp_seg_overlap; }
static inline uint64_t get_tcp_seg_no_space(struct thread_stat *thr_stat) { return thr_stat->session_mgr->tcp_seg_no_space; }
static inline uint64_t get_tcp_seg_inorder(struct thread_stat *thr_stat) { return thr_stat->session_mgr->tcp_seg_inorder; }
static inline uint64_t get_tcp_seg_reorded(struct thread_stat *thr_stat) { return thr_stat->session_mgr->tcp_seg_reorded; }
static inline uint64_t get_tcp_seg_buffered(struct thread_stat *thr_stat) { return thr_stat->session_mgr->tcp_seg_buffered; }
static inline uint64_t get_tcp_seg_released(struct thread_stat *thr_stat) { return thr_stat->session_mgr->tcp_seg_released; }

/*
 * This naming convention maintains consistency by using a clear, structured pattern:
 *      •	tcp_sessions_ or ipv6_frags_ as the prefix to indicate the type of data.
 *      •	Action or status (e.g., bypassed, active, dropped) as the middle part.
 *      •	Cause or condition (e.g., full_table, buffer_limit) as the suffix for additional clarity.
 */
struct metric_schema
{
    const char *name;
    get_val_func *get_val;
} schemas[] =
    {
        // device packet
        {"pkts_rx", get_pkts_rx},
        {"bytes_rx", get_bytes_rx},
        {"pkts_tx", get_pkts_tx},
        {"bytes_tx", get_bytes_tx},
        // keep-alive packet
        {"keep_alive_pkts", get_keep_alive_pkts},
        {"keep_alive_bytes", get_keep_alive_bytes},
        // raw packet
        {"raw_pkts_rx", get_raw_pkts_rx},
        {"raw_bytes_rx", get_raw_bytes_rx},
        {"raw_pkts_tx", get_raw_pkts_tx},
        {"raw_bytes_tx", get_raw_bytes_tx},
        // drop packet
        {"pkts_dropped", get_pkts_dropped},
        {"bytes_dropped", get_bytes_dropped},
        // inject packet
        {"pkts_injected", get_pkts_injected},
        {"bytes_injected", get_bytes_injected},
        // ctrl packet
        {"ctrl_pkts_rx", get_ctrl_pkts_rx},
        {"ctrl_bytes_rx", get_ctrl_bytes_rx},
        {"ctrl_pkts_tx", get_ctrl_pkts_tx},
        {"ctrl_bytes_tx", get_ctrl_bytes_tx},
        // ipv4 reassembly
        {"ip4_flow_find", get_ip4_flow_find},
        {"ip4_flow_add", get_ip4_flow_add},
        {"ip4_flow_del", get_ip4_flow_del},
        {"ip4_flow_timeout", get_ip4_flow_timeout},
        {"ip4_flow_fail_no_space", get_ip4_flow_fail_no_space},
        {"ip4_flow_fail_overlap", get_ip4_flow_fail_overlap},
        {"ip4_flow_fail_many_frag", get_ip4_flow_fail_many_frag},
        {"ip4_flow_fail_invalid_length", get_ip4_flow_fail_invalid_length},
        {"ip4_flow_bypass_dup_fist_frag", get_ip4_flow_bypass_dup_fist_frag},
        {"ip4_flow_bypass_dup_last_frag", get_ip4_flow_bypass_dup_last_frag},
        // ipv6 reassembly
        {"ip6_flow_find", get_ip6_flow_find},
        {"ip6_flow_add", get_ip6_flow_add},
        {"ip6_flow_del", get_ip6_flow_del},
        {"ip6_flow_timeout", get_ip6_flow_timeout},
        {"ip6_flow_fail_no_space", get_ip6_flow_fail_no_space},
        {"ip6_flow_fail_overlap", get_ip6_flow_fail_overlap},
        {"ip6_flow_fail_many_frag", get_ip6_flow_fail_many_frag},
        {"ip6_flow_fail_invalid_length", get_ip6_flow_fail_invalid_length},
        {"ip6_flow_bypass_dup_fist_frag", get_ip6_flow_bypass_dup_fist_frag},
        {"ip6_flow_bypass_dup_last_frag", get_ip6_flow_bypass_dup_last_frag},
        // TCP session
        {"total_tcp_sess_used", get_total_tcp_sess_used},
        {"curr_tcp_sess_used", get_curr_tcp_sess_used},
        {"curr_tcp_sess_opening", get_curr_tcp_sess_opening},
        {"curr_tcp_sess_active", get_curr_tcp_sess_active},
        {"curr_tcp_sess_closing", get_curr_tcp_sess_closing},
        {"curr_tcp_sess_discard", get_curr_tcp_sess_discard},
        {"curr_tcp_sess_closed", get_curr_tcp_sess_closed},
        // UDP session
        {"total_udp_sess_used", get_total_udp_sess_used},
        {"curr_udp_sess_used", get_curr_udp_sess_used},
        {"curr_udp_sess_opening", get_curr_udp_sess_opening},
        {"curr_udp_sess_active", get_curr_udp_sess_active},
        {"curr_udp_sess_closing", get_curr_udp_sess_closing},
        {"curr_udp_sess_discard", get_curr_udp_sess_discard},
        {"curr_udp_sess_closed", get_curr_udp_sess_closed},
        // Evicted session
        {"tcp_sess_evicted", get_tcp_sess_evicted},
        {"udp_sess_evicted", get_udp_sess_evicted},
        // Packet
        {"udp_pkts_nospace_bypass", get_udp_pkts_nospace_bypass},
        {"tcp_pkts_nospace_bypass", get_tcp_pkts_nospace_bypass},
        {"tcp_pkts_nosess_bypass", get_tcp_pkts_nosess_bypass},
        {"tcp_pkts_duped_bypass", get_tcp_pkts_duped_bypass},
        {"udp_pkts_duped_bypass", get_udp_pkts_duped_bypass},
        {"udp_pkts_evctd_bypass", get_udp_pkts_evctd_bypass},
        // TCP segments
        {"tcp_seg_received", get_tcp_seg_received},
        {"tcp_seg_expired", get_tcp_seg_expired},
        {"tcp_seg_retransmit", get_tcp_seg_retransmit},
        {"tcp_seg_overlap", get_tcp_seg_overlap},
        {"tcp_seg_no_space", get_tcp_seg_no_space},
        {"tcp_seg_inorder", get_tcp_seg_inorder},
        {"tcp_seg_reorded", get_tcp_seg_reorded},
        {"tcp_seg_buffered", get_tcp_seg_buffered},
        {"tcp_seg_released", get_tcp_seg_released},
};

struct stellar_stat
{
    uint16_t nr_thread;
    char output_file[2048];
    struct fieldstat_easy *fs;

    int flag[MAX_THREAD_NUM]; // IS_FREE or IS_BUSY
    struct thread_stat thr_stat[MAX_THREAD_NUM];

    struct metric_map
    {
        uint64_t key;
        uint64_t val;
    } map[sizeof(schemas) / sizeof(struct metric_schema)];
};

// python3 -m pip install prettytable
// python3 -m pip install jinja2
// /opt/MESA/bin/fieldstat_exporter.py local -j log/stellar_fs4.json -e -l --clear-screen
struct stellar_stat *stellar_stat_new(uint16_t nr_thread)
{
    char cwd[1024] = {0};
    struct stellar_stat *stat = (struct stellar_stat *)calloc(1, sizeof(struct stellar_stat));
    if (stat == NULL)
    {
        return NULL;
    }

    if (getcwd(cwd, sizeof(cwd)) == NULL)
    {
        STAT_LOG_ERROR("failed to get current working directory: %s", strerror(errno));
        goto error_out;
    }
    snprintf(stat->output_file, sizeof(stat->output_file), "%s/log/stellar_fs4.json", cwd);

    stat->fs = fieldstat_easy_new(1, "stellar", NULL, 0);
    if (stat->fs == NULL)
    {
        STAT_LOG_ERROR("failed to create fieldstat_easy");
        goto error_out;
    }

    stat->nr_thread = nr_thread;
    for (int i = 0; i < MAX_THREAD_NUM; i++)
    {
        stat->flag[i] = IS_FREE;
    }

    for (size_t i = 0; i < sizeof(schemas) / sizeof(struct metric_schema); i++)
    {
        stat->map[i].key = fieldstat_easy_register_counter(stat->fs, schemas[i].name);
        stat->map[i].val = 0;
    }

    return stat;

error_out:
    stellar_stat_free(stat);
    return NULL;
}

void stellar_stat_free(struct stellar_stat *stat)
{
    if (stat)
    {
        if (stat->fs)
        {
            fieldstat_easy_free(stat->fs);
            stat->fs = NULL;
        }
        free(stat);
        stat = NULL;
    }
}

void stellar_stat_output(struct stellar_stat *stat)
{
    for (uint16_t i = 0; i < stat->nr_thread; i++)
    {
        if (ATOMIC_READ(&(stat->flag[i])) == IS_BUSY)
        {
            struct thread_stat *thr_stat = &stat->thr_stat[i];
            for (size_t j = 0; j < sizeof(schemas) / sizeof(struct metric_schema); j++)
            {
                stat->map[j].val += schemas[j].get_val(thr_stat);
            }
            memset(thr_stat, 0, sizeof(struct thread_stat));
            ATOMIC_SET(&(stat->flag[i]), IS_FREE);
        }
    }

    for (size_t j = 0; j < sizeof(schemas) / sizeof(struct metric_schema); j++)
    {
        fieldstat_easy_counter_set(stat->fs, 0, stat->map[j].key, NULL, 0, stat->map[j].val);
    }

    char *buff;
    size_t len;
    fieldstat_easy_output(stat->fs, &buff, &len);
    if (buff)
    {
        FILE *fp = fopen(stat->output_file, "w+");
        if (fp == NULL)
        {
            STAT_LOG_ERROR("failed to open file: %s, %s", stat->output_file, strerror(errno));
        }
        else
        {
            fwrite(buff, len, 1, fp);
            fflush(fp);
            fclose(fp);
        }
        free(buff);
    }

    for (size_t j = 0; j < sizeof(schemas) / sizeof(struct metric_schema); j++)
    {
        stat->map[j].val = 0;
    }
}

void stellar_stat_merge(struct stellar_stat *stat, const struct thread_stat *thr_stat, uint16_t thr_idx)
{
    if (ATOMIC_READ(&(stat->flag[thr_idx])) == IS_FREE)
    {
        memcpy(&stat->thr_stat[thr_idx], thr_stat, sizeof(struct thread_stat));
        ATOMIC_SET(&(stat->flag[thr_idx]), IS_BUSY);
    }
}