#ifndef _SESSION_H
#define _SESSION_H

#ifdef __cpluscplus
extern "C"
{
#endif

#include <stdint.h>

#define SESSION_DIR_C2S 0x01
#define SESSION_DIR_S2C 0x02

#define EX_DATA_MAX_NUM 1024

typedef void free_callback(void *ex_data, void *cb_arg);

struct session_ex_data
{
    void *ex_data;
    void *cb_arg;
    free_callback *free_cb;
};

struct stellar_session
{
    struct stellar_session *father;
    struct session_ex_data ex_data[EX_DATA_MAX_NUM];
    const char *session_name;
    uint8_t current_packet_dir; // SESSION_DIR_C2S or SESSION_DIR_S2C
    const char *l7_payload;
    size_t l7_payload_length;
};

struct session_event
{
    struct stellar_session *session;
    const char *event_name;
    size_t event_id;

    struct session_event *next;
};

void session_event_push(struct session_event *event);
struct session_event *session_event_pop();

struct stellar_session *session_derive(struct stellar_session *session, const char *session_name);
void session_trigger(struct stellar_session *session, const char *event_name);

size_t session_register_ex_data_index(const char *key);

void session_set_ex_data(struct stellar_session *session, int idx, void *ex_data, free_callback *free_cb, void *cb_arg);
void *session_get_ex_data(struct stellar_session *session, int idx);
void session_del_ex_data(struct stellar_session *session, int idx);
void session_free_ex_data(struct stellar_session *session);

const char *session_get_l4_payload(struct stellar_session *session);
size_t session_get_l4_payload_length(struct stellar_session *session);
uint8_t session_get_l4_dir(struct stellar_session *session);

void pm_session_dettach_me(struct stellar_session *session);

#ifdef __cpluscplus
}
#endif

#endif