/**
 * @file tests/unit/test_network.cpp
 * @brief Test src/network.*
 */

// test includes
#include "../tests_common.h"

// local includes
#include <src/network.h>

TEST(NetworkClassificationTest, DeducedNetworkListsPreserveAddressScopes) {
  EXPECT_EQ(net::from_address("127.0.0.1"), net::PC);
  EXPECT_EQ(net::from_address("192.168.1.2"), net::LAN);
  EXPECT_EQ(net::from_address("100.64.0.1"), net::LAN);
  EXPECT_EQ(net::from_address("169.254.1.2"), net::LAN);
  EXPECT_EQ(net::from_address("8.8.8.8"), net::WAN);
  EXPECT_EQ(net::from_address("::1"), net::PC);
  EXPECT_EQ(net::from_address("fc00::1"), net::LAN);
  EXPECT_EQ(net::from_address("fe80::1"), net::LAN);
  EXPECT_EQ(net::from_address("2001:4860:4860::8888"), net::WAN);
}

/**
 * @brief Loopback and documentation addresses retain their classification when mapped to IPv6.
 */
TEST(NetworkClassificationTest, ClassifiesMappedIpv4AddressesWithoutChangingSubsequentLookups) {
  for (const auto *address : {"127.0.0.1", "192.0.2.1", "198.51.100.2", "203.0.113.3"}) {
    const auto expected = net::from_address(address);
    EXPECT_EQ(net::from_address(std::string {"::ffff:"} + address), expected);
    EXPECT_EQ(net::from_address(address), expected);
  }
}

struct MdnsInstanceNameTest: BaseTest, testing::WithParamInterface<std::tuple<std::string, std::string>> {};

TEST_P(MdnsInstanceNameTest, Run) {
  auto [input, expected] = GetParam();
  ASSERT_EQ(net::mdns_instance_name(input), expected);
}

INSTANTIATE_TEST_SUITE_P(
  MdnsInstanceNameTests,
  MdnsInstanceNameTest,
  testing::Values(
    std::make_tuple("shortname-123", "shortname-123"),
    std::make_tuple("space 123", "space-123"),
    std::make_tuple("hostname.domain.test", "hostname"),
    std::make_tuple("&", "Sunshine"),
    std::make_tuple("", "Sunshine"),
    std::make_tuple("😁", "Sunshine"),
    std::make_tuple(std::string(128, 'a'), std::string(63, 'a'))
  )
);

/**
 * @brief Test fixture for bind_address tests with setup/teardown
 */
class BindAddressTest: public BaseTest {
protected:
  std::string original_bind_address;

  void SetUp() override {
    BaseTest::SetUp();
    // Save the original bind_address config
    original_bind_address = config::sunshine.bind_address;
  }

  void TearDown() override {
    // Restore the original bind_address config
    config::sunshine.bind_address = original_bind_address;
    BaseTest::TearDown();
  }
};

/**
 * @brief Test that get_bind_address returns wildcard when bind_address is not configured
 */
TEST_F(BindAddressTest, DefaultBehaviorIPv4) {
  // Clear bind_address to test the default behavior
  config::sunshine.bind_address = "";

  const auto bind_addr = net::get_bind_address(net::af_e::IPV4);
  ASSERT_EQ(bind_addr, "0.0.0.0");
}

/**
 * @brief Test that get_bind_address returns wildcard when bind_address is not configured (IPv6)
 */
TEST_F(BindAddressTest, DefaultBehaviorIPv6) {
  // Clear bind_address to test the default behavior
  config::sunshine.bind_address = "";

  const auto bind_addr = net::get_bind_address(net::af_e::BOTH);
  ASSERT_EQ(bind_addr, "::");
}

/**
 * @brief Test that an empty bind address preserves the configured address family.
 */
TEST_F(BindAddressTest, EmptyAddressPreservesConfiguredFamily) {
  config::sunshine.bind_address = "";

  EXPECT_EQ(net::get_effective_address_family(net::af_e::IPV4), net::af_e::IPV4);
  EXPECT_EQ(net::get_effective_address_family(net::af_e::BOTH), net::af_e::BOTH);
}

/**
 * @brief Test that an explicit IPv4 bind address selects an IPv4 socket.
 */
TEST_F(BindAddressTest, IPv4AddressSelectsIPv4Family) {
  config::sunshine.bind_address = "192.0.2.101";

  EXPECT_EQ(net::get_effective_address_family(net::af_e::IPV4), net::af_e::IPV4);
  EXPECT_EQ(net::get_effective_address_family(net::af_e::BOTH), net::af_e::IPV4);
}

/**
 * @brief Test that an explicit IPv6 bind address does not override the configured family.
 */
TEST_F(BindAddressTest, IPv6AddressPreservesConfiguredFamily) {
  config::sunshine.bind_address = "2001:db8::1";

  EXPECT_EQ(net::get_effective_address_family(net::af_e::IPV4), net::af_e::IPV4);
  EXPECT_EQ(net::get_effective_address_family(net::af_e::BOTH), net::af_e::BOTH);
}

/**
 * @brief Test that invalid bind addresses preserve the configured family for downstream error reporting.
 */
TEST_F(BindAddressTest, InvalidAddressPreservesConfiguredFamily) {
  config::sunshine.bind_address = "not-an-address";

  EXPECT_EQ(net::get_effective_address_family(net::af_e::IPV4), net::af_e::IPV4);
  EXPECT_EQ(net::get_effective_address_family(net::af_e::BOTH), net::af_e::BOTH);
}

/**
 * @brief Test that bind addresses are formatted for use as URL hosts.
 */
TEST_F(BindAddressTest, AddressFormatsAsUrlHost) {
  config::sunshine.bind_address = "";
  EXPECT_EQ(net::get_bind_address_url_host(), "localhost");

  config::sunshine.bind_address = "198.51.100.56";
  EXPECT_EQ(net::get_bind_address_url_host(), "198.51.100.56");

  config::sunshine.bind_address = "2001:db8::1";
  EXPECT_EQ(net::get_bind_address_url_host(), "[2001:db8::1]");

  config::sunshine.bind_address = "not-an-address";
  EXPECT_EQ(net::get_bind_address_url_host(), "not-an-address");
}

/**
 * @brief Test that get_bind_address returns configured IPv4 address
 */
TEST_F(BindAddressTest, ConfiguredIPv4Address) {
  // Set a specific IPv4 address
  config::sunshine.bind_address = "192.168.1.100";

  const auto bind_addr = net::get_bind_address(net::af_e::IPV4);
  ASSERT_EQ(bind_addr, "192.168.1.100");
}

/**
 * @brief Test that get_bind_address returns configured IPv6 address
 */
TEST_F(BindAddressTest, ConfiguredIPv6Address) {
  // Set a specific IPv6 address
  config::sunshine.bind_address = "::1";

  const auto bind_addr = net::get_bind_address(net::af_e::BOTH);
  ASSERT_EQ(bind_addr, "::1");
}

/**
 * @brief Test that get_bind_address returns configured address regardless of address family
 */
TEST_F(BindAddressTest, ConfiguredAddressOverridesFamily) {
  // Set a specific IPv6 address but request IPv4 family
  // The configured address should still be returned
  config::sunshine.bind_address = "2001:db8::1";

  const auto bind_addr = net::get_bind_address(net::af_e::IPV4);
  ASSERT_EQ(bind_addr, "2001:db8::1");
}

/**
 * @brief Test with loopback addresses
 */
TEST_F(BindAddressTest, LoopbackAddresses) {
  // Test IPv4 loopback
  config::sunshine.bind_address = "127.0.0.1";
  const auto bind_addr_v4 = net::get_bind_address(net::af_e::IPV4);
  ASSERT_EQ(bind_addr_v4, "127.0.0.1");

  // Test IPv6 loopback
  config::sunshine.bind_address = "::1";
  const auto bind_addr_v6 = net::get_bind_address(net::af_e::BOTH);
  ASSERT_EQ(bind_addr_v6, "::1");
}

/**
 * @brief Test with link-local addresses
 */
TEST_F(BindAddressTest, LinkLocalAddresses) {
  // Test IPv4 link-local
  config::sunshine.bind_address = "169.254.1.1";
  const auto bind_addr_v4 = net::get_bind_address(net::af_e::IPV4);
  ASSERT_EQ(bind_addr_v4, "169.254.1.1");

  // Test IPv6 link-local
  config::sunshine.bind_address = "fe80::1";
  const auto bind_addr_v6 = net::get_bind_address(net::af_e::BOTH);
  ASSERT_EQ(bind_addr_v6, "fe80::1");
}

/**
 * @brief Test that af_to_any_address_string still works correctly
 */
TEST_F(BindAddressTest, WildcardAddressFunction) {
  ASSERT_EQ(net::af_to_any_address_string(net::af_e::IPV4), "0.0.0.0");
  ASSERT_EQ(net::af_to_any_address_string(net::af_e::BOTH), "::");
}