package verify

import (
	"fmt"
	"net"

	"quickip/internal/model"
)

type Service struct{}

func New() *Service { return &Service{} }

func (s *Service) Verify(input model.InterfaceConfig) error {
	iface, err := net.InterfaceByName(input.Interface)
	if err != nil {
		return err
	}
	addrs, err := iface.Addrs()
	if err != nil {
		return err
	}
	for _, addr := range addrs {
		ipNet, ok := addr.(*net.IPNet)
		if !ok || ipNet.IP.To4() == nil {
			continue
		}
		prefix, _ := ipNet.Mask.Size()
		if ipNet.IP.String() == input.IP && prefix == input.Prefix {
			return nil
		}
	}
	return fmt.Errorf("目标接口地址未按预期生效")
}