//go:build linux

package tc

import (
	"fmt"
	"strings"

	"github.com/hashicorp/go-multierror"
	"github.com/vishvananda/netlink"
)

type Tc interface {
	Add() error
	Delete() error
	Replace() error
}

func Adder() func(commandList ...Tc) error {
	var err *multierror.Error
	return func(commandList ...Tc) error {
		for _, command := range commandList {
			err = multierror.Append(err, command.Add())
		}
		return err.ErrorOrNil()
	}
}

func Replacer() func(commandList ...Tc) error {
	var err *multierror.Error
	return func(commandList ...Tc) error {
		for _, command := range commandList {
			err = multierror.Append(err, command.Replace())
		}
		return err.ErrorOrNil()
	}
}

func errorIsNotFound(err error) bool {
	return strings.Contains(err.Error(), "not found") || strings.Contains(err.Error(), "no such file or directory")
}

func errorIsFileExists(err error) bool {
	return strings.Contains(err.Error(), "file exists")
}

func formatTcError(prefix string, linkIndex int, parent, handle uint32, tcErr error) error {
	link, err := netlink.LinkByIndex(linkIndex)
	if err != nil {
		return fmt.Errorf("failed to get link when handling err: %w", tcErr)
	}
	return fmt.Errorf(
		"%s with parent %s and handle %s (dev %s): %w",
		prefix,
		netlink.HandleStr(parent),
		netlink.HandleStr(handle),
		link.Attrs().Name,
		err,
	)
}