package conf

import (
	"fmt"
	"net"
	"regexp"
)

var rePathName = regexp.MustCompile(`^[0-9a-zA-Z_\-/]+$`)

// CheckPathName check if a path name is valid.
func CheckPathName(name string) error {
	if name == "" {
		return fmt.Errorf("cannot be empty")
	}

	if name[0] == '/' {
		return fmt.Errorf("can't begin with a slash")
	}

	if name[len(name)-1] == '/' {
		return fmt.Errorf("can't end with a slash")
	}

	if !rePathName.MatchString(name) {
		return fmt.Errorf("can contain only alfanumeric characters, underscore, minus or slash")
	}

	return nil
}

func parseIPCidrList(in []string) ([]interface{}, error) {
	if len(in) == 0 {
		return nil, nil
	}

	var ret []interface{}
	for _, t := range in {
		_, ipnet, err := net.ParseCIDR(t)
		if err == nil {
			ret = append(ret, ipnet)
			continue
		}

		ip := net.ParseIP(t)
		if ip != nil {
			ret = append(ret, ip)
			continue
		}

		return nil, fmt.Errorf("unable to parse ip/network '%s'", t)
	}
	return ret, nil
}