package monitor_test

import (
	"testing"

	"git.eeqj.de/sneak/rtnetmon/internal/monitor"
)

// Interface names and hosts reused across the monitor package tests.
const (
	ifaceTest0 = "test0"
	ifaceTest1 = "test1"
	ifaceEth0  = "eth0"
	host8888   = "8.8.8.8"
)

func TestNewMonitor(t *testing.T) {
	t.Parallel()

	mon := monitor.NewMonitor([]monitor.IfaceSpec{
		{Name: ifaceTest0, Label: "Test Interface A"},
		{Name: ifaceTest1, Label: "Test Interface B"},
	}, "/tmp/test.log")

	ifaces := mon.Interfaces()
	if len(ifaces) != 2 {
		t.Fatalf("interfaces = %d, want 2", len(ifaces))
	}

	if ifaces[0].Name != ifaceTest0 {
		t.Errorf("interfaces[0].Name = %q, want %q", ifaces[0].Name, ifaceTest0)
	}

	if ifaces[1].Name != ifaceTest1 {
		t.Errorf("interfaces[1].Name = %q, want %q", ifaces[1].Name, ifaceTest1)
	}

	if mon.ICMPTimeout.Milliseconds() != 500 {
		t.Errorf("ICMPTimeout = %dms, want 500ms", mon.ICMPTimeout.Milliseconds())
	}

	if mon.PacketLossPings != 20 {
		t.Errorf("PacketLossPings = %d, want 20", mon.PacketLossPings)
	}

	if mon.ReachabilityHosts() == nil {
		t.Error("reachabilityHosts is nil")
	}

	if mon.PacketLossHosts() == nil {
		t.Error("packetLossHosts is nil")
	}

	if mon.TCPHosts() == nil {
		t.Error("tcpHosts is nil")
	}
}

func TestNewMonitorSingle(t *testing.T) {
	t.Parallel()

	mon := monitor.NewMonitor(
		[]monitor.IfaceSpec{{Name: ifaceEth0, Label: "default route"}}, "")

	ifaces := mon.Interfaces()
	if len(ifaces) != 1 {
		t.Fatalf("interfaces = %d, want 1", len(ifaces))
	}

	if ifaces[0].Name != ifaceEth0 {
		t.Errorf("interfaces[0].Name = %q, want %q", ifaces[0].Name, ifaceEth0)
	}
}

func TestAddHosts(t *testing.T) {
	t.Parallel()

	mon := monitor.NewMonitor([]monitor.IfaceSpec{
		{Name: ifaceTest0, Label: "Test A"},
		{Name: ifaceTest1, Label: "Test B"},
	}, "")

	mon.AddReachabilityHost(host8888)
	mon.AddReachabilityHost("google.com")

	if len(mon.ReachabilityHosts()) != 2 {
		t.Errorf("reachability hosts = %d, want 2", len(mon.ReachabilityHosts()))
	}

	mon.AddPacketLossHost("github.com")

	if len(mon.PacketLossHosts()) != 1 {
		t.Errorf("packet loss hosts = %d, want 1", len(mon.PacketLossHosts()))
	}

	mon.AddTCPHost("google.com:443")
	mon.AddTCPHost("github.com:443")

	if len(mon.TCPHosts()) != 2 {
		t.Errorf("tcp hosts = %d, want 2", len(mon.TCPHosts()))
	}
}

func TestMinMaxAvgStd(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name                      string
		data                      []float64
		wantMin, wantMax, wantAvg float64
	}{
		{"empty slice", []float64{}, 0, 0, 0},
		{"single value", []float64{5.0}, 5.0, 5.0, 5.0},
		{"multiple values", []float64{1.0, 2.0, 3.0, 4.0, 5.0}, 1.0, 5.0, 3.0},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()

			mn, mx, avg, _ := monitor.MinMaxAvgStd(tt.data)
			if mn != tt.wantMin {
				t.Errorf("min = %v, want %v", mn, tt.wantMin)
			}

			if mx != tt.wantMax {
				t.Errorf("max = %v, want %v", mx, tt.wantMax)
			}

			if avg != tt.wantAvg {
				t.Errorf("avg = %v, want %v", avg, tt.wantAvg)
			}
		})
	}
}