// TCP state machine test: opening -> active
#include <gtest/gtest.h>

#include "tuple.h"
#include "packet_def.h"
#include "packet_parse.h"
#include "packet_layer.h"
#include "id_generator.h"
#include "session_utils.h"
#include "session_manager.h"
#include "test_packets.h"

struct session_manager_options opts = {
    // max session number
    .max_tcp_session_num = 256,
    .max_udp_session_num = 256,

    // session overload
    .tcp_overload_evict_old_sess = 1, // 1: evict old session, 0: bypass new session
    .udp_overload_evict_old_sess = 1, // 1: evict old session, 0: bypass new session

    // tcp timeout
    .tcp_init_timeout = 1,
    .tcp_handshake_timeout = 2,
    .tcp_data_timeout = 3,
    .tcp_half_closed_timeout = 4,
    .tcp_time_wait_timeout = 5,
    .tcp_discard_timeout = 6,
    .tcp_unverified_rst_timeout = 7,

    // udp timeout
    .udp_data_timeout = 8,

    // duplicate packet filter
    .duplicated_packet_filter_enable = 1,
    .duplicated_packet_filter_capacity = 1000,
    .duplicated_packet_filter_timeout = 10,
    .duplicated_packet_filter_error_rate = 0.0001,

    // evicted session filter
    .evicted_session_filter_enable = 1,
    .evicted_session_filter_capacity = 1000,
    .evicted_session_filter_timeout = 10,
    .evicted_session_filter_error_rate = 0.0001,

    // TCP Reassembly
    .tcp_reassembly_enable = 1,
    .tcp_reassembly_max_timeout = 60000,
    .tcp_reassembly_max_segments = 16,
};

/******************************************************************************
 * case: TCP opening -> active (by C2S DATA)
 ******************************************************************************/

#if 1
TEST(TCP_OPENING_TO_ACTIVE, BY_SYN_C2S_DATA)
{
    char buffer[1024] = {0};
    struct packet pkt;
    struct session *sess = NULL;
    struct session_manager *mgr = NULL;
    struct session_manager_stat *stat = NULL;

    mgr = session_manager_new(&opts, 1);
    EXPECT_TRUE(mgr != NULL);

    // C2S SYN Packet
    printf("\n=> Packet Parse: TCP C2S SYN packet\n");
    memset(&pkt, 0, sizeof(pkt));
    packet_parse(&pkt, (const char *)tcp_pkt1_c2s_syn, sizeof(tcp_pkt1_c2s_syn));
    printf("<= Packet Parse: done\n\n");

    // lookup session
    EXPECT_TRUE(session_manager_lookup_session_by_packet(mgr, &pkt) == NULL);
    // new session
    sess = session_manager_new_session(mgr, &pkt, 1);
    EXPECT_TRUE(sess);

    // C2S DATA Packet
    printf("\n=> Packet Parse: TCP C2S DATA packet\n");
    memset(&pkt, 0, sizeof(pkt));
    packet_parse(&pkt, (const char *)tcp_pkt4_c2s_http_req, sizeof(tcp_pkt4_c2s_http_req));
    printf("<= Packet Parse: done\n\n");

    // lookup session
    sess = session_manager_lookup_session_by_packet(mgr, &pkt);
    EXPECT_TRUE(sess);
    // update session
    EXPECT_TRUE(session_manager_update_session(mgr, sess, &pkt, 2) == 0);

    EXPECT_TRUE(session_get_id(sess) != 0);
    tuple6_to_str(session_get_tuple6(sess), buffer, sizeof(buffer));
    EXPECT_STREQ(buffer, "192.168.38.105:60111-93.184.216.34:80-6-0");
    EXPECT_TRUE(session_get_tuple6_direction(sess) == FLOW_DIRECTION_C2S);
    EXPECT_TRUE(session_get_current_state(sess) == SESSION_STATE_ACTIVE);
    EXPECT_TRUE(session_get_type(sess) == SESSION_TYPE_TCP);
    EXPECT_TRUE(session_has_duplicate_traffic(sess) == 0);
    EXPECT_TRUE(session_get_closing_reason(sess) == 0);
    EXPECT_TRUE(session_get_stat(sess, FLOW_DIRECTION_C2S, STAT_RAW_BYTES_RECEIVED) == 78 + 145);
    EXPECT_TRUE(session_get_stat(sess, FLOW_DIRECTION_S2C, STAT_RAW_BYTES_RECEIVED) == 0);
    EXPECT_TRUE(session_get_stat(sess, FLOW_DIRECTION_C2S, STAT_RAW_PACKETS_RECEIVED) == 1 + 1);
    EXPECT_TRUE(session_get_stat(sess, FLOW_DIRECTION_S2C, STAT_RAW_PACKETS_RECEIVED) == 0);
    EXPECT_TRUE(session_get_timestamp(sess, SESSION_TIMESTAMP_START));
    EXPECT_TRUE(session_get_timestamp(sess, SESSION_TIMESTAMP_LAST));
    EXPECT_TRUE(session_get0_current_packet(sess) == &pkt);
    EXPECT_TRUE(session_get_current_flow_direction(sess) == FLOW_DIRECTION_C2S);
    EXPECT_TRUE(session_get_first_packet(sess, FLOW_DIRECTION_C2S) != NULL);
    EXPECT_TRUE(session_get_first_packet(sess, FLOW_DIRECTION_S2C) == NULL);
    session_print(sess);

    // check stat
    stat = session_manager_stat(mgr);
    EXPECT_TRUE(stat);
    EXPECT_TRUE(stat->curr_nr_tcp_sess_used == 1);
    EXPECT_TRUE(stat->curr_nr_tcp_sess_opening == 0);
    EXPECT_TRUE(stat->curr_nr_tcp_sess_active == 1);
    EXPECT_TRUE(stat->curr_nr_tcp_sess_closing == 0);

    // expire session
    EXPECT_TRUE(session_manager_get_expired_session(mgr, 2 + opts.tcp_data_timeout) == NULL);
    sess = session_manager_get_expired_session(mgr, 2 + opts.tcp_data_timeout + opts.tcp_data_timeout);
    EXPECT_TRUE(sess);
    EXPECT_TRUE(session_get_current_state(sess) == SESSION_STATE_CLOSED);
    EXPECT_TRUE(session_get_closing_reason(sess) == CLOSING_BY_TIMEOUT);
    session_print(sess);
    // free session
    session_manager_free_session(mgr, sess);

    // check stat
    stat = session_manager_stat(mgr);
    EXPECT_TRUE(stat);
    EXPECT_TRUE(stat->curr_nr_tcp_sess_used == 0);
    EXPECT_TRUE(stat->curr_nr_tcp_sess_opening == 0);
    EXPECT_TRUE(stat->curr_nr_tcp_sess_active == 0);
    EXPECT_TRUE(stat->curr_nr_tcp_sess_closing == 0);

    session_manager_free(mgr);
}
#endif

/******************************************************************************
 * case: TCP opening -> active (by S2C DATA)
 ******************************************************************************/

#if 1
TEST(TCP_OPENING_TO_ACTIVE, BY_SYNACK_S2C_DATA)
{
    char buffer[1024] = {0};
    struct packet pkt;
    struct session *sess = NULL;
    struct session_manager *mgr = NULL;
    struct session_manager_stat *stat = NULL;

    mgr = session_manager_new(&opts, 1);
    EXPECT_TRUE(mgr != NULL);

    // S2C SYNACK Packet
    printf("\n=> Packet Parse: TCP S2C SYNACK packet\n");
    memset(&pkt, 0, sizeof(pkt));
    packet_parse(&pkt, (const char *)tcp_pkt2_s2c_syn_ack, sizeof(tcp_pkt2_s2c_syn_ack));
    printf("<= Packet Parse: done\n\n");

    // lookup session
    EXPECT_TRUE(session_manager_lookup_session_by_packet(mgr, &pkt) == NULL);
    // new session
    sess = session_manager_new_session(mgr, &pkt, 1);
    EXPECT_TRUE(sess);

    // S2C DATA Packet
    printf("\n=> Packet Parse: TCP S2C DATA packet\n");
    memset(&pkt, 0, sizeof(pkt));
    packet_parse(&pkt, (const char *)tcp_pkt6_s2c_http_resq_1, sizeof(tcp_pkt6_s2c_http_resq_1));
    printf("<= Packet Parse: done\n\n");

    // lookup session
    sess = session_manager_lookup_session_by_packet(mgr, &pkt);
    EXPECT_TRUE(sess);
    // update session
    EXPECT_TRUE(session_manager_update_session(mgr, sess, &pkt, 2) == 0);

    EXPECT_TRUE(session_get_id(sess) != 0);
    tuple6_to_str(session_get_tuple6(sess), buffer, sizeof(buffer));
    EXPECT_STREQ(buffer, "93.184.216.34:80-192.168.38.105:60111-6-0");
    EXPECT_TRUE(session_get_tuple6_direction(sess) == FLOW_DIRECTION_S2C);
    EXPECT_TRUE(session_get_current_state(sess) == SESSION_STATE_ACTIVE);
    EXPECT_TRUE(session_get_type(sess) == SESSION_TYPE_TCP);
    EXPECT_TRUE(session_has_duplicate_traffic(sess) == 0);
    EXPECT_TRUE(session_get_closing_reason(sess) == 0);
    EXPECT_TRUE(session_get_stat(sess, FLOW_DIRECTION_C2S, STAT_RAW_BYTES_RECEIVED) == 0);
    EXPECT_TRUE(session_get_stat(sess, FLOW_DIRECTION_S2C, STAT_RAW_BYTES_RECEIVED) == 74 + 1354);
    EXPECT_TRUE(session_get_stat(sess, FLOW_DIRECTION_C2S, STAT_RAW_PACKETS_RECEIVED) == 0);
    EXPECT_TRUE(session_get_stat(sess, FLOW_DIRECTION_S2C, STAT_RAW_PACKETS_RECEIVED) == 1 + 1);
    EXPECT_TRUE(session_get_timestamp(sess, SESSION_TIMESTAMP_START));
    EXPECT_TRUE(session_get_timestamp(sess, SESSION_TIMESTAMP_LAST));
    EXPECT_TRUE(session_get0_current_packet(sess) == &pkt);
    EXPECT_TRUE(session_get_current_flow_direction(sess) == FLOW_DIRECTION_S2C);
    EXPECT_TRUE(session_get_first_packet(sess, FLOW_DIRECTION_C2S) == NULL);
    EXPECT_TRUE(session_get_first_packet(sess, FLOW_DIRECTION_S2C) != NULL);
    session_print(sess);

    // check stat
    stat = session_manager_stat(mgr);
    EXPECT_TRUE(stat);
    EXPECT_TRUE(stat->curr_nr_tcp_sess_used == 1);
    EXPECT_TRUE(stat->curr_nr_tcp_sess_opening == 0);
    EXPECT_TRUE(stat->curr_nr_tcp_sess_active == 1);
    EXPECT_TRUE(stat->curr_nr_tcp_sess_closing == 0);

    // expire session
    EXPECT_TRUE(session_manager_get_expired_session(mgr, 2 + opts.tcp_data_timeout) == NULL);
    sess = session_manager_get_expired_session(mgr, 2 + opts.tcp_data_timeout + opts.tcp_data_timeout);
    EXPECT_TRUE(sess);
    EXPECT_TRUE(session_get_current_state(sess) == SESSION_STATE_CLOSED);
    EXPECT_TRUE(session_get_closing_reason(sess) == CLOSING_BY_TIMEOUT);
    session_print(sess);
    // free session
    session_manager_free_session(mgr, sess);

    // check stat
    stat = session_manager_stat(mgr);
    EXPECT_TRUE(stat);
    EXPECT_TRUE(stat->curr_nr_tcp_sess_used == 0);
    EXPECT_TRUE(stat->curr_nr_tcp_sess_opening == 0);
    EXPECT_TRUE(stat->curr_nr_tcp_sess_active == 0);
    EXPECT_TRUE(stat->curr_nr_tcp_sess_closing == 0);

    session_manager_free(mgr);
}
#endif

int main(int argc, char **argv)
{
    struct id_generator_options opt = {
        .snowflake_worker_id_base = 1,
        .snowflake_worker_id_offset = 2,
    };
    id_generator_init(&opt);
    ::testing::InitGoogleTest(&argc, argv);
    return RUN_ALL_TESTS();
}