package main

import (
	"fmt"
	"os"
	"time"

	rotatelogs "github.com/lestrrat-go/file-rotatelogs"
	"github.com/rifflock/lfshook"
	"github.com/sirupsen/logrus"
)

/*
注意，当天文件放项目根目录下

env LOGLEVEL=debug
*/
func init() {
	//日志初始化
	level := os.Getenv("LOGLEVEL")

	switch level {
	case "debug":
		logrus.SetLevel(logrus.DebugLevel)
	case "info":
		logrus.SetLevel(logrus.InfoLevel)
	case "warn":
		logrus.SetLevel(logrus.WarnLevel)
	case "error":
		logrus.SetLevel(logrus.ErrorLevel)
	case "fatal":
		logrus.SetLevel(logrus.FatalLevel)
	default:
		logrus.SetLevel(logrus.PanicLevel)
	}

	logrus.AddHook(newLfsHook(72))
}

func newLfsHook(maxRemainCnt uint) logrus.Hook {
	//检查与创建日志文件夹
	_, err := os.Stat("logs")
	if os.IsNotExist(err) {
		os.Mkdir("logs", 0755)
	}

	logName := fmt.Sprintf(`logs/%s`, "device-wg")
	writer, err := rotatelogs.New(
		logName+"%Y%m%d.log",
		// WithLinkName为最新的日志建立软连接，以方便随着找到当前日志文件
		rotatelogs.WithLinkName(logName),

		// WithRotationTime设置日志分割的时间，这里设置为一小时分割一次
		rotatelogs.WithRotationTime(24*time.Hour),

		// WithMaxAge和WithRotationCount二者只能设置一个，
		// WithMaxAge设置文件清理前的最长保存时间，
		// WithRotationCount设置文件清理前最多保存的个数。
		//rotatelogs.WithMaxAge(time.Hour*24),
		rotatelogs.WithRotationCount(maxRemainCnt),
	)

	if err != nil {
		panic("config local file system for logger error: " + err.Error())
	}

	lfsHook := lfshook.NewHook(lfshook.WriterMap{
		logrus.DebugLevel: writer,
		logrus.InfoLevel:  writer,
		logrus.WarnLevel:  writer,
		logrus.ErrorLevel: writer,
		logrus.FatalLevel: writer,
		logrus.PanicLevel: writer,
	}, &logrus.TextFormatter{DisableColors: true})

	return lfsHook
}