#include <gtest/gtest.h>

#include "tuple.h"
#include "packet_private.h"
#include "packet_parser.h"
#include "session_private.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,
    .udp_discard_timeout = 0,

    // 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,
};

static uint64_t session_id_generator(uint64_t now_ms __attribute__((unused)))
{
    static uint64_t count = 0;
    return (++count);
}

#if 1
TEST(TIMEOUT, UDP_TIMEOUT_DATA1)
{
    struct packet pkt;
    struct session *sess = NULL;
    struct session_manager *mgr = NULL;

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

    // C2S REQ Packet
    printf("\n=> Packet Parse: UDP C2S REQ packet\n");
    memset(&pkt, 0, sizeof(pkt));
    packet_parse(&pkt, (const char *)udp_pkt1_dns_req, sizeof(udp_pkt1_dns_req));
    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);

    // expire session
    EXPECT_TRUE(session_manager_get_expired_session(mgr, 1 + opts.udp_data_timeout) == NULL);           // opening -> closing
    sess = session_manager_get_expired_session(mgr, 1 + opts.udp_data_timeout + opts.udp_data_timeout); // closing -> closed
    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);

    session_manager_free(mgr);
}
#endif

#if 1
TEST(TIMEOUT, UDP_TIMEOUT_DATA2)
{
    struct packet pkt;
    struct session *sess = NULL;
    struct session_manager *mgr = NULL;

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

    // C2S REQ Packet
    printf("\n=> Packet Parse: UDP C2S REQ packet\n");
    memset(&pkt, 0, sizeof(pkt));
    packet_parse(&pkt, (const char *)udp_pkt1_dns_req, sizeof(udp_pkt1_dns_req));
    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 RESP Packet
    printf("\n=> Packet Parse: UDP S2C RESP packet\n");
    memset(&pkt, 0, sizeof(pkt));
    packet_parse(&pkt, (const char *)udp_pkt2_dns_resp, sizeof(udp_pkt2_dns_resp));
    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);

    // expire session
    EXPECT_TRUE(session_manager_get_expired_session(mgr, 2 + opts.udp_data_timeout) == NULL);           // active -> closing
    sess = session_manager_get_expired_session(mgr, 2 + opts.udp_data_timeout + opts.udp_data_timeout); // closing -> closed
    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);

    session_manager_free(mgr);
}
#endif

int main(int argc, char **argv)
{
    ::testing::InitGoogleTest(&argc, argv);
    return RUN_ALL_TESTS();
}
