package gelf

import (
	"fmt"

	"github.com/juju/errors"
	"github.com/sirupsen/logrus"

	graylog "github.com/gemnasium/logrus-graylog-hook/v3"
)

// NewHook will create a Gelf Hook for logrus.
func NewHook(c *ConfigStruct) (logrus.Hook, error) {

	err := c.IsValid()
	if err != nil {
		return nil, errors.Trace(err)
	}

	hook := graylog.NewAsyncGraylogHook(
		fmt.Sprintf("%s:%d", c.Host, c.Port),
		c.ExtrasFields,
	)

	defer hook.Flush()

	return hook, nil
}