package monitor

import (
	"testing"
)

// TestNewMonitor tests the creation of a new Monitor
func TestNewMonitor(t *testing.T) {
	// Test that we can create a monitor without errors
	mon := NewMonitor([]IfaceSpec{
		{Name: "test0", Label: "Test Interface A"},
		{Name: "test1", Label: "Test Interface B"},
	}, "/tmp/test.log")

	if mon == nil {
		t.Fatal("NewMonitor returned nil")
	}

	// Check interfaces
	if len(mon.interfaces) != 2 {
		t.Fatalf("Expected 2 interfaces, got %d", len(mon.interfaces))
	}

	if mon.interfaces[0].Name != "test0" {
		t.Errorf("Expected interfaces[0].Name to be 'test0', got '%s'", mon.interfaces[0].Name)
	}

	if mon.interfaces[1].Name != "test1" {
		t.Errorf("Expected interfaces[1].Name to be 'test1', got '%s'", mon.interfaces[1].Name)
	}

	// Check default configuration
	if mon.ICMPTimeout.Milliseconds() != 500 {
		t.Errorf("Expected ICMPTimeout to be 500ms, got %dms", mon.ICMPTimeout.Milliseconds())
	}

	if mon.PacketLossPings != 20 {
		t.Errorf("Expected PacketLossPings to be 20, got %d", mon.PacketLossPings)
	}

	// Check that host lists are initialized
	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")
	}
}

// TestNewMonitorSingle verifies a monitor can be built with one interface.
func TestNewMonitorSingle(t *testing.T) {
	mon := NewMonitor([]IfaceSpec{{Name: "eth0", Label: "default route"}}, "")

	if len(mon.interfaces) != 1 {
		t.Fatalf("Expected 1 interface, got %d", len(mon.interfaces))
	}

	if mon.interfaces[0].Name != "eth0" {
		t.Errorf("Expected interfaces[0].Name to be 'eth0', got '%s'", mon.interfaces[0].Name)
	}
}

// TestAddHosts tests adding hosts to the monitor
func TestAddHosts(t *testing.T) {
	mon := NewMonitor([]IfaceSpec{
		{Name: "test0", Label: "Test A"},
		{Name: "test1", Label: "Test B"},
	}, "")

	// Test adding reachability hosts
	mon.AddReachabilityHost("8.8.8.8")
	mon.AddReachabilityHost("google.com")

	if len(mon.reachabilityHosts) != 2 {
		t.Errorf("Expected 2 reachability hosts, got %d", len(mon.reachabilityHosts))
	}

	// Test adding packet loss hosts
	mon.AddPacketLossHost("github.com")

	if len(mon.packetLossHosts) != 1 {
		t.Errorf("Expected 1 packet loss host, got %d", len(mon.packetLossHosts))
	}

	// Test adding TCP hosts
	mon.AddTCPHost("google.com:443")
	mon.AddTCPHost("github.com:443")

	if len(mon.tcpHosts) != 2 {
		t.Errorf("Expected 2 TCP hosts, got %d", len(mon.tcpHosts))
	}
}

// TestMinMaxAvgStd tests the statistics calculation function
func TestMinMaxAvgStd(t *testing.T) {
	tests := []struct {
		name                      string
		data                      []float64
		wantMin, wantMax, wantAvg float64
	}{
		{
			name:    "empty slice",
			data:    []float64{},
			wantMin: 0, wantMax: 0, wantAvg: 0,
		},
		{
			name:    "single value",
			data:    []float64{5.0},
			wantMin: 5.0, wantMax: 5.0, wantAvg: 5.0,
		},
		{
			name:    "multiple values",
			data:    []float64{1.0, 2.0, 3.0, 4.0, 5.0},
			wantMin: 1.0, wantMax: 5.0, wantAvg: 3.0,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			min, max, avg, _ := MinMaxAvgStd(tt.data)

			if min != tt.wantMin {
				t.Errorf("MinMaxAvgStd() min = %v, want %v", min, tt.wantMin)
			}
			if max != tt.wantMax {
				t.Errorf("MinMaxAvgStd() max = %v, want %v", max, tt.wantMax)
			}
			if avg != tt.wantAvg {
				t.Errorf("MinMaxAvgStd() avg = %v, want %v", avg, tt.wantAvg)
			}
		})
	}
}