/*************************************************************************
 *
 * Copyright (C) 2018-2025 Ruilin Peng (Nick) <pymumu@gmail.com>.
 *
 * smartdns is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * smartdns is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "client.h"
#include "smartdns/dns.h"
#include "include/utils.h"
#include "server.h"
#include "gtest/gtest.h"

class Cname : public ::testing::Test
{
  protected:
	virtual void SetUp() {}
	virtual void TearDown() {}
};

TEST_F(Cname, cname)
{
	smartdns::MockServer server_upstream;
	smartdns::Server server;

	server_upstream.Start("udp://0.0.0.0:61053", [](struct smartdns::ServerRequestContext *request) {
		if (request->qtype != DNS_T_A) {
			return smartdns::SERVER_REQUEST_SOA;
		}

		smartdns::MockServer::AddIP(request, request->domain.c_str(), "1.2.3.4", 611);
		EXPECT_EQ(request->domain, "e.com");
		return smartdns::SERVER_REQUEST_OK;
	});

	server.Start(R"""(bind [::]:60053
cname /a.com/b.com
cname /b.com/c.com
cname /c.com/d.com
cname /d.com/e.com
server 127.0.0.1:61053
)""");
	smartdns::Client client;
	ASSERT_TRUE(client.Query("a.com", 60053));
	std::cout << client.GetResult() << std::endl;
	ASSERT_EQ(client.GetAnswerNum(), 2);
	EXPECT_EQ(client.GetStatus(), "NOERROR");
	EXPECT_EQ(client.GetAnswer()[0].GetName(), "a.com");
	EXPECT_EQ(client.GetAnswer()[0].GetData(), "b.com.");
	EXPECT_EQ(client.GetAnswer()[1].GetData(), "1.2.3.4");
}

TEST_F(Cname, subdomain1)
{
	smartdns::MockServer server_upstream;
	smartdns::Server server;

	server_upstream.Start("udp://0.0.0.0:61053", [](struct smartdns::ServerRequestContext *request) {
		if (request->qtype != DNS_T_A) {
			return smartdns::SERVER_REQUEST_SOA;
		}

		if (request->domain == "s.a.com") {
			smartdns::MockServer::AddIP(request, request->domain.c_str(), "4.5.6.7", 700);
			return smartdns::SERVER_REQUEST_OK;
		}

		smartdns::MockServer::AddIP(request, request->domain.c_str(), "1.2.3.4", 611);
		return smartdns::SERVER_REQUEST_OK;
	});

	server.Start(R"""(bind [::]:60053
cname /a.com/s.a.com
server 127.0.0.1:61053
)""");
	smartdns::Client client;
	ASSERT_TRUE(client.Query("a.com", 60053));
	std::cout << client.GetResult() << std::endl;
	ASSERT_EQ(client.GetAnswerNum(), 2);
	EXPECT_EQ(client.GetStatus(), "NOERROR");
	EXPECT_EQ(client.GetAnswer()[0].GetName(), "a.com");
	EXPECT_EQ(client.GetAnswer()[0].GetData(), "s.a.com.");
	EXPECT_EQ(client.GetAnswer()[1].GetData(), "4.5.6.7");
}

TEST_F(Cname, subdomain2)
{
	smartdns::MockServer server_upstream;
	smartdns::Server server;

	server_upstream.Start("udp://0.0.0.0:61053", [](struct smartdns::ServerRequestContext *request) {
		if (request->qtype != DNS_T_A) {
			return smartdns::SERVER_REQUEST_SOA;
		}

		if (request->domain == "a.s.a.com") {
			smartdns::MockServer::AddIP(request, request->domain.c_str(), "4.5.6.7", 700);
			return smartdns::SERVER_REQUEST_OK;
		}

		smartdns::MockServer::AddIP(request, request->domain.c_str(), "1.2.3.4", 611);
		return smartdns::SERVER_REQUEST_OK;
	});

	server.Start(R"""(bind [::]:60053
cname /a.com/s.a.com
cname /s.a.com/a.s.a.com
server 127.0.0.1:61053
)""");
	smartdns::Client client;
	ASSERT_TRUE(client.Query("a.com", 60053));
	std::cout << client.GetResult() << std::endl;
	ASSERT_EQ(client.GetAnswerNum(), 2);
	EXPECT_EQ(client.GetStatus(), "NOERROR");
	EXPECT_EQ(client.GetAnswer()[0].GetName(), "a.com");
	EXPECT_EQ(client.GetAnswer()[0].GetData(), "s.a.com.");
	EXPECT_EQ(client.GetAnswer()[1].GetData(), "4.5.6.7");
}

TEST_F(Cname, loop)
{
	smartdns::MockServer server_upstream;
	smartdns::Server server;

	server_upstream.Start("udp://0.0.0.0:61053", [](struct smartdns::ServerRequestContext *request) {
		if (request->qtype != DNS_T_A) {
			return smartdns::SERVER_REQUEST_SOA;
		}

		if (request->domain == "s.a.com") {
			smartdns::MockServer::AddIP(request, request->domain.c_str(), "4.5.6.7", 700);
			return smartdns::SERVER_REQUEST_OK;
		}

		smartdns::MockServer::AddIP(request, request->domain.c_str(), "1.2.3.4", 611);
		return smartdns::SERVER_REQUEST_OK;
	});

	server.Start(R"""(bind [::]:60053
cname /a.com/c.a.com
cname /c.a.com/s.a.com
server 127.0.0.1:61053
)""");
	smartdns::Client client;
	ASSERT_TRUE(client.Query("a.com", 60053));
	std::cout << client.GetResult() << std::endl;
	ASSERT_EQ(client.GetAnswerNum(), 2);
	EXPECT_EQ(client.GetStatus(), "NOERROR");
	EXPECT_EQ(client.GetAnswer()[0].GetName(), "a.com");
	EXPECT_EQ(client.GetAnswer()[0].GetData(), "c.a.com.");
	EXPECT_EQ(client.GetAnswer()[1].GetData(), "4.5.6.7");
}

TEST_F(Cname, query_cname)
{
	smartdns::MockServer server_upstream;
	smartdns::Server server;

	server_upstream.Start("udp://0.0.0.0:61053", [](struct smartdns::ServerRequestContext *request) {
		if (request->qtype != DNS_T_A) {
			return smartdns::SERVER_REQUEST_SOA;
		}

		if (request->domain == "s.a.com") {
			smartdns::MockServer::AddIP(request, request->domain.c_str(), "4.5.6.7", 700);
			return smartdns::SERVER_REQUEST_OK;
		}

		smartdns::MockServer::AddIP(request, request->domain.c_str(), "1.2.3.4", 611);
		return smartdns::SERVER_REQUEST_OK;
	});

	server.Start(R"""(bind [::]:60053
cname /a.com/s.a.com
server 127.0.0.1:61053
)""");
	smartdns::Client client;
	ASSERT_TRUE(client.Query("s.a.com", 60053));
	std::cout << client.GetResult() << std::endl;
	ASSERT_EQ(client.GetAnswerNum(), 1);
	EXPECT_EQ(client.GetStatus(), "NOERROR");
	EXPECT_EQ(client.GetAnswer()[0].GetName(), "s.a.com");
	EXPECT_EQ(client.GetAnswer()[0].GetData(), "4.5.6.7");
}