//go:build !windows && !nacl && !plan9

package syslog

import (
	"fmt"
	"log/syslog"
	"os"

	"github.com/sirupsen/logrus"
)

// SyslogHook to send logs via syslog.
type SyslogHook struct {
	Writer        *syslog.Writer
	SyslogNetwork string
	SyslogRaddr   string
}

var _ logrus.Hook = (*SyslogHook)(nil)

// NewSyslogHook creates a hook to be added to an instance of logger.
//
// This is called with:
//
//	hook, err := NewSyslogHook("udp", "localhost:514", syslog.LOG_DEBUG, "")
//	if err == nil {
//		log.Hooks.Add(hook)
//	}
func NewSyslogHook(network, raddr string, priority syslog.Priority, tag string) (*SyslogHook, error) {
	w, err := syslog.Dial(network, raddr, priority, tag)
	return &SyslogHook{w, network, raddr}, err
}

func (hook *SyslogHook) Fire(entry *logrus.Entry) error {
	line, err := entry.String()
	if err != nil {
		_, _ = fmt.Fprintf(os.Stderr, "Unable to read entry, %v", err)
		return err
	}

	switch entry.Level {
	case logrus.PanicLevel:
		return hook.Writer.Crit(line)
	case logrus.FatalLevel:
		return hook.Writer.Crit(line)
	case logrus.ErrorLevel:
		return hook.Writer.Err(line)
	case logrus.WarnLevel:
		return hook.Writer.Warning(line)
	case logrus.InfoLevel:
		return hook.Writer.Info(line)
	case logrus.DebugLevel, logrus.TraceLevel:
		return hook.Writer.Debug(line)
	default:
		return nil
	}
}

func (hook *SyslogHook) Levels() []logrus.Level {
	return logrus.AllLevels
}
