package daemon

import (
	"context"
	"fmt"
	"isle/bootstrap"
	"isle/dnsmasq"
	"path/filepath"
	"sort"

	"code.betamike.com/micropelago/pmux/pmuxlib"
	"dev.mediocregopher.com/mediocre-go-lib.git/mlog"
)

func dnsmasqPmuxProcConfig(
	logger *mlog.Logger,
	runtimeDirPath, binDirPath string,
	hostBootstrap bootstrap.Bootstrap,
	daemonConfig Config,
) (
	pmuxlib.ProcessConfig, error,
) {
	confPath := filepath.Join(runtimeDirPath, "dnsmasq.conf")

	hostsSlice := make([]dnsmasq.ConfDataHost, 0, len(hostBootstrap.Hosts))
	for _, host := range hostBootstrap.Hosts {
		hostsSlice = append(hostsSlice, dnsmasq.ConfDataHost{
			Name: string(host.Name),
			IP:   host.IP().String(),
		})
	}

	sort.Slice(hostsSlice, func(i, j int) bool {
		return hostsSlice[i].IP < hostsSlice[j].IP
	})

	confData := dnsmasq.ConfData{
		Resolvers: daemonConfig.DNS.Resolvers,
		Domain:    hostBootstrap.NetworkCreationParams.Domain,
		IP:        hostBootstrap.ThisHost().IP().String(),
		Hosts:     hostsSlice,
	}

	if err := dnsmasq.WriteConfFile(confPath, confData); err != nil {
		return pmuxlib.ProcessConfig{}, fmt.Errorf("writing dnsmasq.conf to %q: %w", confPath, err)
	}

	return pmuxlib.ProcessConfig{
		Cmd:  filepath.Join(binDirPath, "dnsmasq"),
		Args: []string{"-d", "-C", confPath},
		StartAfterFunc: func(ctx context.Context) error {
			return waitForNebula(ctx, logger, hostBootstrap)
		},
	}, nil
}