package gelf

import (
	"strconv"

	"github.com/asaskevich/govalidator"
	"github.com/juju/errors"
)

// ConfigStruct is the configuration for GELF Provider.
type ConfigStruct struct {
	Host         string                 `yaml:"host"`
	Port         int                    `yaml:"port"`
	ExtrasFields map[string]interface{} `yaml:"extra_fields"`
}

// IsValid will check that the Gelf configuration is valid.
func (c *ConfigStruct) IsValid() error {
	if c.Host == "" {
		return errors.NotValidf("Host is empty in GELF configuration")
	} else if !govalidator.IsDNSName(c.Host) && !govalidator.IsIP(c.Host) {
		return errors.NotValidf("Host is invalid in GELF configuration. Should be a DNS name or an IP")
	}

	if c.Port == 0 {
		return errors.NotValidf("Port is empty in GELF configuration")
	} else if !govalidator.IsPort(strconv.Itoa(c.Port)) {
		return errors.NotValidf("Port is invalid in GELF configuration")
	}

	return nil
}