package rtable

import (
	"errors"
	"fmt"
	"log"
	"os/exec"

	"github.com/crip/ripv2"
)

func Pass(r *ripv2.Routes) {
	var err error
	r.Lock()
	for k, route := range r.Routes {
		switch route.FIB {
		case ripv2.NEW:
			if err = command(ADD, &route); err != nil {
				log.Printf("rtable: failed to add route %d: %s", route.FIB, err)
			}
			route.FIB = ripv2.TABLE
		case ripv2.DELETE:
			if err = command(REMOVE, &route); err != nil {
				log.Printf("rtable: failed to remove route %d: %s", route.FIB, err)
			}
			delete(r.Routes, k)
		default:
			log.Println("unknown FIB type")
		}
	}
	r.Unlock()
}

func command(command COMMAND, r *ripv2.Route) error {
	var cmd *exec.Cmd
	switch command {
	case ADD, REMOVE:
		cmd = exec.Command("route", string(command), "-net", r.Addr.String(), r.Subnet.String(), r.NextHop.String(), "-hopcount", fmt.Sprint(r.Metric))
	default:
		return errors.New("command not supported")
	}
	return cmd.Run()
}