package nfs

import (
	"fmt"
	"os"

	"github.com/hpcng/warewulf/internal/pkg/util"
	"github.com/hpcng/warewulf/internal/pkg/warewulfconf"
	"github.com/hpcng/warewulf/internal/pkg/wwlog"

	"github.com/pkg/errors"
	"github.com/spf13/cobra"
)

func CobraRunE(cmd *cobra.Command, args []string) error {
	return Configure(SetShow)
}

func Configure(show bool) error {

	controller, err := warewulfconf.New()
	if err != nil {
		wwlog.Printf(wwlog.ERROR, "%s\n", err)
		os.Exit(1)
	}

	if controller.Network == "" {
		wwlog.Printf(wwlog.ERROR, "Network must be defined in warewulf.conf to configure NFS\n")
		os.Exit(1)
	}
	if controller.Netmask == "" {
		wwlog.Printf(wwlog.ERROR, "Netmask must be defined in warewulf.conf to configure NFS\n")
		os.Exit(1)
	}

	if !SetShow {

		if controller.Nfs.Enabled {
			exports, err := os.OpenFile("/etc/exports", os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
			if err != nil {
				wwlog.Printf(wwlog.ERROR, "%s\n", err)
				os.Exit(1)
			}
			defer exports.Close()

			fmt.Fprintf(exports, "# This file was written by Warewulf (wwctl configure nfs)\n")

			for _, export := range controller.Nfs.ExportsExtended {
				fmt.Fprintf(exports, "%s %s/%s(%s)\n", export.Path, controller.Network, controller.Netmask, export.ExportOptions)
			}

			fmt.Printf("Enabling and restarting the NFS services\n")
			if controller.Nfs.SystemdName == "" {
				err := util.SystemdStart("nfs-server")
				if err != nil {
					return errors.Wrap(err, "failed to start nfs-server")
				}
			} else {
				err := util.SystemdStart(controller.Nfs.SystemdName)
				if err != nil {
					return errors.Wrap(err, "failed to start")
				}
			}
		}
	} else {
		fmt.Printf("/etc/exports:\n")

		for _, export := range controller.Nfs.ExportsExtended {
			fmt.Printf("%s %s/%s\n", export.Path, controller.Network, controller.Netmask)
		}
		fmt.Printf("\n")
	}

	return nil
}