package dhcp

import (
	"net/netip"

	"git.wntrmute.dev/kyle/kdhcp/leases"
)

func NewOffer(request *Packet, server *leases.Server, lease *leases.Info) (offer *Packet, err error) {
	packet := &Packet{
		MessageType:     MessageTypeBootResponse,
		HardwareType:    request.HardwareType,
		HardwareAddress: request.HardwareAddress,
		Hops:            0,
		TransactionID:   request.TransactionID,
		SecondsElapsed:  0,
		Flags:           request.Flags,
		ServerName:      "",
		FileName:        "",
		ClientIP:        request.ClientIP,
		YourIP:          lease.Addr,
		NextIP:          netip.IPv4Unspecified(),
		RelayIP:         netip.IPv4Unspecified(),
		DHCPType:        DHCPMessageTypeOffer,
		HostName:        "",
		ClientID:        request.ClientID,
		Parameters:      []Parameter{},
	}

	packet.AddParameter(ParameterDNS(server.Network.DNS))
	packet.AddParameter(ParameterHostName(lease.HostName))
	packet.AddParameter(ParameterRouter(server.Network.Gateway))
	packet.AddParameter(ParameterSubnetMask(server.Network.Mask))

	return packet, nil
}