package main

import (
	"encoding"
	"fmt"
	"isle/nebula"
	"net/netip"
)

type textUnmarshaler[T any] interface {
	encoding.TextUnmarshaler
	*T
}

type textUnmarshalerFlag[T encoding.TextMarshaler, P textUnmarshaler[T]] struct {
	V T
}

func (f *textUnmarshalerFlag[T, P]) Set(v string) error {
	return P(&(f.V)).UnmarshalText([]byte(v))
}

func (f *textUnmarshalerFlag[T, P]) String() string {
	b, err := f.V.MarshalText()
	if err != nil {
		panic(fmt.Sprintf("calling MarshalText on %#v: %v", f.V, err))
	}
	return string(b)
}

func (f *textUnmarshalerFlag[T, P]) Type() string { return "string" }

////////////////////////////////////////////////////////////////////////////////

type (
	hostNameFlag = textUnmarshalerFlag[nebula.HostName, *nebula.HostName]
	ipNetFlag    = textUnmarshalerFlag[nebula.IPNet, *nebula.IPNet]
	ipFlag       = textUnmarshalerFlag[netip.Addr, *netip.Addr]
)