#include <gtest/gtest.h>

#include "sysmon/network_monitor.hpp"

TEST(NetworkMonitorTest, ReturnsVector) {

NetworkMonitor mon;

// First call initializes internal state (may return empty on first run)

auto result1 = mon.read();

auto result2 = mon.read();

// After two calls, we should have results

EXPECT_GE(result2.size(), 0u);

}

TEST(NetworkMonitorTest, InterfaceNameNotEmpty) {

NetworkMonitor mon;

mon.read(); // warm-up

auto result = mon.read();

for (const auto& n : result) {

EXPECT_FALSE(n.name.empty());

}

}

TEST(NetworkMonitorTest, RatesNonNegative) {

NetworkMonitor mon;

mon.read();

auto result = mon.read();

for (const auto& n : result) {

EXPECT_GE(n.rx_bytes_per_sec, 0.0);

EXPECT_GE(n.tx_bytes_per_sec, 0.0);

}

}

// ---------------------------------------------------------------------------

// Routing and resolver parsing

// ---------------------------------------------------------------------------

TEST(NetworkMonitorTest, ParsesDefaultGatewayFromProcNetRoute) {

// /proc/net/route stores addresses as little-endian hex words.

// 0101A8C0 == 192.168.1.1

const std::string content =

"Iface\tDestination\tGateway \tFlags\tRefCnt\tUse\tMetric\tMask\n"

"eth0\t0000A8C0\t00000000\t0001\t0\t0\t0\t00FFFFFF\n"

"eth0\t00000000\t0101A8C0\t0003\t0\t0\t100\t00000000\n";

EXPECT_EQ(NetworkMonitor::parse_proc_net_route(content), "192.168.1.1");

}

TEST(NetworkMonitorTest, NoDefaultRouteYieldsEmptyGateway) {

const std::string content =

"Iface\tDestination\tGateway \tFlags\tRefCnt\tUse\tMetric\tMask\n"

"eth0\t0000A8C0\t00000000\t0001\t0\t0\t0\t00FFFFFF\n";

EXPECT_TRUE(NetworkMonitor::parse_proc_net_route(content).empty());

EXPECT_TRUE(NetworkMonitor::parse_proc_net_route("").empty());

}

TEST(NetworkMonitorTest, ParsesNameserversAndSkipsComments) {

const std::string content =

"# generated by resolvconf\n"

"search example.com\n"

"nameserver 192.168.1.1\n"

"nameserver 8.8.8.8 # secondary\n"

"nameserver 192.168.1.1\n" // duplicate

"options edns0\n";

const auto servers = NetworkMonitor::parse_resolv_conf(content);

ASSERT_EQ(servers.size(), 2u);

EXPECT_EQ(servers[0], "192.168.1.1");

EXPECT_EQ(servers[1], "8.8.8.8");

}

TEST(NetworkMonitorTest, LinkSpeedIsEitherUnsetOrPlausible) {

NetworkMonitor monitor;

for (const auto& n : monitor.read()) {

if (!n.speed_mbps.has_value()) continue;

// A reported link speed must be a real one, not a zero placeholder.

EXPECT_GT(n.speed_mbps.value(), 0u) << n.name;

EXPECT_LE(n.speed_mbps.value(), 1'000'000u) << n.name;

}

}