package config

import "fmt"

type ProxyARP struct {
	// Address is the IP address to proxy ARP for.
	Address string `yaml:"address"`

	// Interface is the local interface where the proxied host resides.
	Interface string `yaml:"interface,omitempty"`

	// External is the external-facing interface.
	External string `yaml:"external"`

	// HaveRoute indicates that a route to the address already exists,
	// so no interface is required.
	HaveRoute bool `yaml:"haveroute,omitempty"`

	// Persistent survives firewall restarts.
	Persistent bool `yaml:"persistent,omitempty"`

	Comment string `yaml:"comment,omitempty"`
}

func (c *Config) validateProxyARP() error {
	for i, p := range c.ProxyARP {
		if p.Address == "" {
			return fmt.Errorf("proxyarp[%d]: address required", i)
		}
		if p.External == "" {
			return fmt.Errorf("proxyarp[%d]: external required", i)
		}
		if p.Interface == "" && !p.HaveRoute {
			return fmt.Errorf("proxyarp[%d]: interface required unless haveroute is set", i)
		}
	}
	return nil
}