// Copyright 2025, IPng Networks GmbH, Pim van Pelt <pim@ipng.ch>

package vpp

import (
	"go.fd.io/govpp/binapi/interface_types"
	"testing"
)

func TestNewInterfaceManager(t *testing.T) {
	client := NewVPPClient()
	manager := NewInterfaceManager(client)

	if manager == nil {
		t.Fatal("NewInterfaceManager() returned nil")
	}

	if manager.client != client {
		t.Error("InterfaceManager should store the provided client")
	}

	if manager.eventCallback != nil {
		t.Error("InterfaceManager should have nil callback initially")
	}
}

func TestInterfaceManagerSetEventCallback(t *testing.T) {
	client := NewVPPClient()
	manager := NewInterfaceManager(client)

	var callbackCalled bool
	var receivedDetails []InterfaceDetails

	callback := func(details []InterfaceDetails) {
		callbackCalled = true
		receivedDetails = details
	}

	manager.SetEventCallback(callback)

	if manager.eventCallback == nil {
		t.Error("SetEventCallback() should store the callback")
	}

	// Test callback execution
	testDetails := []InterfaceDetails{
		{
			SwIfIndex:     1,
			InterfaceName: "test-interface",
			MacAddress:    []byte{0xde, 0xad, 0xbe, 0xef, 0x00, 0x01},
			Speed:         1000000000,
			AdminStatus:   true,
			OperStatus:    true,
			MTU:           1500,
		},
	}

	manager.eventCallback(testDetails)

	if !callbackCalled {
		t.Error("Callback should have been called")
	}

	if len(receivedDetails) != 1 {
		t.Errorf("Expected 1 interface detail, got %d", len(receivedDetails))
	}

	if receivedDetails[0].InterfaceName != "test-interface" {
		t.Errorf("Expected interface name 'test-interface', got %q", receivedDetails[0].InterfaceName)
	}
}

func TestInterfaceManagerGetAllInterfaceDetailsWithoutConnection(t *testing.T) {
	client := NewVPPClient()
	manager := NewInterfaceManager(client)

	_, err := manager.GetAllInterfaceDetails()
	if err == nil {
		t.Error("GetAllInterfaceDetails() should return error when not connected")
	}

	vppErr, ok := err.(*VPPError)
	if !ok {
		t.Errorf("Expected VPPError, got %T", err)
	}

	if vppErr.Message != "VPP client not connected" {
		t.Errorf("Expected specific error message, got: %s", vppErr.Message)
	}
}

func TestInterfaceManagerStartEventWatcherWithoutConnection(t *testing.T) {
	client := NewVPPClient()
	manager := NewInterfaceManager(client)

	err := manager.StartEventWatcher()
	if err == nil {
		t.Error("StartEventWatcher() should return error when not connected")
	}

	vppErr, ok := err.(*VPPError)
	if !ok {
		t.Errorf("Expected VPPError, got %T", err)
	}

	if vppErr.Message != "VPP client not connected" {
		t.Errorf("Expected specific error message, got: %s", vppErr.Message)
	}
}

func TestInterfaceManagerHandleInterfaceEventWithoutCallback(t *testing.T) {
	client := NewVPPClient()
	manager := NewInterfaceManager(client)

	// Should not panic when callback is nil
	manager.handleInterfaceEvent()
}

func TestInterfaceDetails(t *testing.T) {
	details := InterfaceDetails{
		SwIfIndex:     interface_types.InterfaceIndex(42),
		InterfaceName: "GigabitEthernet0/8/0",
		MacAddress:    []byte{0x02, 0xfe, 0x3c, 0x4d, 0x5e, 0x6f},
		Speed:         10000000000, // 10 Gbps
		AdminStatus:   true,
		OperStatus:    false,
		MTU:           9000,
	}

	if details.SwIfIndex != 42 {
		t.Errorf("Expected SwIfIndex 42, got %d", details.SwIfIndex)
	}

	if details.InterfaceName != "GigabitEthernet0/8/0" {
		t.Errorf("Expected interface name 'GigabitEthernet0/8/0', got %q", details.InterfaceName)
	}

	if len(details.MacAddress) != 6 {
		t.Errorf("Expected MAC address length 6, got %d", len(details.MacAddress))
	}

	if details.Speed != 10000000000 {
		t.Errorf("Expected speed 10000000000, got %d", details.Speed)
	}

	if !details.AdminStatus {
		t.Error("Expected AdminStatus true")
	}

	if details.OperStatus {
		t.Error("Expected OperStatus false")
	}

	if details.MTU != 9000 {
		t.Errorf("Expected MTU 9000, got %d", details.MTU)
	}
}

func TestInterfaceEventCallback(t *testing.T) {
	var callbackInvoked bool
	var callbackDetails []InterfaceDetails

	callback := InterfaceEventCallback(func(details []InterfaceDetails) {
		callbackInvoked = true
		callbackDetails = details
	})

	testDetails := []InterfaceDetails{
		{SwIfIndex: 1, InterfaceName: "test1"},
		{SwIfIndex: 2, InterfaceName: "test2"},
	}

	callback(testDetails)

	if !callbackInvoked {
		t.Error("Callback should have been invoked")
	}

	if len(callbackDetails) != 2 {
		t.Errorf("Expected 2 interface details, got %d", len(callbackDetails))
	}

	if callbackDetails[0].InterfaceName != "test1" {
		t.Errorf("Expected first interface 'test1', got %q", callbackDetails[0].InterfaceName)
	}

	if callbackDetails[1].InterfaceName != "test2" {
		t.Errorf("Expected second interface 'test2', got %q", callbackDetails[1].InterfaceName)
	}
}