package children

import (
	"errors"
	"fmt"
	"isle/bootstrap"
	"isle/daemon/daecommon"
	"reflect"
)

// ReloadDiff describes which children had their configurations changed as part
// of a change in the bootstrap.
type ReloadDiff struct {
	NebulaChanged bool
	DNSChanged    bool
}

// CalculateReloadDiff calculates a ReloadDiff based on an old and new
// bootstrap.
func CalculateReloadDiff(
	daemonConfig daecommon.Config,
	prevBootstrap, nextBootstrap bootstrap.Bootstrap,
) (
	diff ReloadDiff, err error,
) {
	{
		prevNebulaConfig, prevErr := nebulaConfig(daemonConfig, prevBootstrap)
		nextNebulaConfig, nextErr := nebulaConfig(daemonConfig, nextBootstrap)
		if err = errors.Join(prevErr, nextErr); err != nil {
			err = fmt.Errorf("calculating nebula config: %w", err)
			return
		}

		diff.NebulaChanged = !reflect.DeepEqual(
			prevNebulaConfig, nextNebulaConfig,
		)
	}

	{
		diff.DNSChanged = !reflect.DeepEqual(
			dnsmasqConfig(daemonConfig, prevBootstrap),
			dnsmasqConfig(daemonConfig, nextBootstrap),
		)
	}

	return
}