#include <gtest/gtest.h>
#include <cstring>
#include <string>
#include <algorithm>
#include <stdint.h>
#include "tcp.h"
#include "utils.h"

using namespace std;
using namespace Tins;

class TCPTest : public testing::Test {
public:
    static const uint8_t expected_packet[];
    
    void test_equals(const TCP &tcp1, const TCP &tcp2);
};

const uint8_t TCPTest::expected_packet[] = {'\x7f', 'M', 'O', '\x1d', '\xf1', '\xda', '\xe5', 
'F', '_', '\xae', '\xd1', '#', '\xd0', '\x02', 'q', '\xda', '\x00', '\x00', '\x1f', '\xae', 
'\x02', '\x04', '\x98', '\xfa', '\x08', '\n', 'O', '\xd2', ':', '\xcb', '\x89', '\xfe', 
'\x12', '4', '\x03', '\x03', 'z', '\x04', '\x02', '\x05', '\n', '\x00', '\x01', '\x02', 
'\x03', '\x04', '\x05', '\x06', '\x07', '\x00', '\x00', '\x00'};


TEST_F(TCPTest, DefaultConstructor) {
    TCP tcp;
    EXPECT_EQ(tcp.dport(), 0);
    EXPECT_EQ(tcp.sport(), 0);
    EXPECT_EQ(tcp.pdu_type(), PDU::TCP);
}

TEST_F(TCPTest, CopyConstructor) {
    TCP tcp1(0x6d1f, 0x78f2);
    TCP tcp2(tcp1);
    test_equals(tcp1, tcp2);
}

TEST_F(TCPTest, CopyAssignmentOperator) {
    TCP tcp1(0x6d1f, 0x78f2);
    TCP tcp2 = tcp1;
    test_equals(tcp1, tcp2);
}

TEST_F(TCPTest, NestedCopy) {
    TCP *nested_tcp = new TCP(0x6d1f, 0x78f2);
    TCP tcp1(0x6d1f, 0x78f2);
    tcp1.inner_pdu(nested_tcp);
    TCP tcp2(tcp1);
    test_equals(tcp1, tcp2);
}

TEST_F(TCPTest, CompleteConstructor) {
    TCP tcp(0x6d1f, 0x78f2);
    EXPECT_EQ(tcp.dport(), 0x6d1f);
    EXPECT_EQ(tcp.sport(), 0x78f2);
}

TEST_F(TCPTest, DPort) {
    TCP tcp;
    tcp.dport(0x5fad);
    EXPECT_EQ(tcp.dport(), 0x5fad);
}

TEST_F(TCPTest, SPort) {
    TCP tcp;
    tcp.sport(0x5fad);
    EXPECT_EQ(tcp.sport(), 0x5fad);
}

TEST_F(TCPTest, Seq) {
    TCP tcp;
    tcp.seq(0x5fad65fb);
    EXPECT_EQ(tcp.seq(), 0x5fad65fb);
}

TEST_F(TCPTest, AckSeq) {
    TCP tcp;
    tcp.ack_seq(0x5fad65fb);
    EXPECT_EQ(tcp.ack_seq(), 0x5fad65fb);
}

TEST_F(TCPTest, Window) {
    TCP tcp;
    tcp.window(0x5fad);
    EXPECT_EQ(tcp.window(), 0x5fad);
}

TEST_F(TCPTest, Check) {
    TCP tcp;
    tcp.check(0x5fad);
    EXPECT_EQ(tcp.check(), 0x5fad);
}

TEST_F(TCPTest, UrgPtr) {
    TCP tcp;
    tcp.urg_ptr(0x5fad);
    EXPECT_EQ(tcp.urg_ptr(), 0x5fad);
}

TEST_F(TCPTest, DataOffset) {
    TCP tcp;
    tcp.data_offset(0xe);
    EXPECT_EQ(tcp.data_offset(), 0xe);
}

TEST_F(TCPTest, SetFlag) {
    TCP tcp;
    tcp.set_flag(TCP::SYN, 1);
    tcp.set_flag(TCP::FIN, 1);
    
    EXPECT_EQ(tcp.get_flag(TCP::SYN), 1);
    EXPECT_EQ(tcp.get_flag(TCP::FIN), 1);
    EXPECT_EQ(tcp.get_flag(TCP::RST), 0);
    EXPECT_EQ(tcp.get_flag(TCP::PSH), 0);
    EXPECT_EQ(tcp.get_flag(TCP::ACK), 0);
    EXPECT_EQ(tcp.get_flag(TCP::URG), 0);
    EXPECT_EQ(tcp.get_flag(TCP::ECE), 0);
    EXPECT_EQ(tcp.get_flag(TCP::CWR), 0);
}

TEST_F(TCPTest, MSS) {
    TCP tcp;
    tcp.mss(0x456f);
    EXPECT_EQ(0x456f, tcp.mss());
}

TEST_F(TCPTest, WindowScale) {
    TCP tcp;
    tcp.winscale(0x4f);
    EXPECT_EQ(0x4f, tcp.winscale());
}

TEST_F(TCPTest, SackPermitted) {
    TCP tcp;
    tcp.sack_permitted();
    ASSERT_TRUE(tcp.has_sack_permitted());
}

TEST_F(TCPTest, Sack) {
    TCP tcp;
    TCP::sack_type edges;
    edges.push_back(0x13);
    edges.push_back(0x63fa1d7a);
    edges.push_back(0xff1c);
    tcp.sack(edges);
    ASSERT_EQ(edges, tcp.sack());
}

TEST_F(TCPTest, AlternateChecksum) {
    TCP tcp;
    tcp.altchecksum(TCP::CHK_16FLETCHER);
    EXPECT_EQ(TCP::CHK_16FLETCHER, tcp.altchecksum());
}

TEST_F(TCPTest, Timestamp) {
    TCP tcp;
    std::pair<uint32_t, uint32_t> data(0x456fa23d, 0xfa12d345);
    tcp.timestamp(data.first, data.second);
    EXPECT_EQ(tcp.timestamp(), data);
}

void TCPTest::test_equals(const TCP &tcp1, const TCP &tcp2) {
    EXPECT_EQ(tcp1.dport(), tcp2.dport());
    EXPECT_EQ(tcp2.sport(), tcp2.sport());
    EXPECT_EQ(tcp1.seq(), tcp2.seq());
    EXPECT_EQ(tcp1.ack_seq(), tcp2.ack_seq());
    EXPECT_EQ(tcp1.window(), tcp2.window());
    EXPECT_EQ(tcp1.check(), tcp2.check());
    EXPECT_EQ(tcp1.urg_ptr(), tcp2.urg_ptr());
    EXPECT_EQ(tcp1.data_offset(), tcp2.data_offset());
    EXPECT_EQ((bool)tcp1.inner_pdu(), (bool)tcp2.inner_pdu());
}

// This is not working, but i don't want to fix it right now.
TEST_F(TCPTest, ConstructorFromBuffer) {
    TCP tcp1(expected_packet, sizeof(expected_packet));
    
    EXPECT_EQ(tcp1.dport(), 0x4f1d);
    EXPECT_EQ(tcp1.sport(), 0x7f4d);
    EXPECT_EQ(tcp1.seq(), 0xf1dae546);
    EXPECT_EQ(tcp1.ack_seq(), 0x5faed123);
    EXPECT_EQ(tcp1.window(), 0x71da);
    EXPECT_EQ(tcp1.urg_ptr(), 0x1fae);
    EXPECT_EQ(tcp1.data_offset(), 0xd);
    
    EXPECT_EQ(tcp1.timestamp(), (std::pair<uint32_t, uint32_t>(0x4fd23acb, 0x89fe1234)));
    
    EXPECT_TRUE(tcp1.has_sack_permitted());
    
    EXPECT_EQ(tcp1.winscale(), 0x7a);
    
    EXPECT_EQ(tcp1.mss(), 0x98fa);
    
    TCP::sack_type edges = tcp1.sack();
    TCP::sack_type::const_iterator iter = edges.begin();
    ASSERT_EQ(edges.size(), 2);
    EXPECT_EQ(*iter++, 0x00010203);
    EXPECT_EQ(*iter++, 0x04050607); 
    
    PDU::serialization_type buffer = tcp1.serialize();
    
    TCP tcp2(&buffer[0], buffer.size());
    test_equals(tcp1, tcp2);
}

TEST_F(TCPTest, Serialize) {
    TCP tcp1(expected_packet, sizeof(expected_packet));
    PDU::serialization_type buffer = tcp1.serialize();
    ASSERT_EQ(buffer.size(), sizeof(expected_packet));
    EXPECT_TRUE(std::equal(buffer.begin(), buffer.end(), expected_packet));
}