//go:build darwin

package netdetect

import (
	"context"
	"fmt"
	"os/exec"
	"time"
)

// routeQueryTimeout bounds the external route-table query.
const routeQueryTimeout = 2 * time.Second

// DefaultRoutes returns the host's IPv4 default routes, read from the macOS
// routing table.
func DefaultRoutes() ([]Route, error) {
	ctx, cancel := context.WithTimeout(context.Background(), routeQueryTimeout)
	defer cancel()

	out, err := exec.CommandContext(ctx, "netstat", "-rn", "-f", "inet").Output()
	if err != nil {
		return nil, fmt.Errorf("running netstat: %w", err)
	}

	return parseNetstat(string(out)), nil
}