package utils

import (
	"io"
	"os"
	"path/filepath"
	"strings"
	"time"

	"github.com/natefinch/lumberjack"
	"github.com/sirupsen/logrus"
)

var Logger *logrus.Logger

func InitLogger(logDir string, levelConf string) {
	Logger = logrus.New()

	// --- 目录准备（和之前一样） ---
	cwd, err := os.Getwd()
	if err != nil {
		panic(err)
	}
	fullLogDir := filepath.Join(cwd, logDir)
	if err := os.MkdirAll(fullLogDir, 0755); err != nil {
		panic(err)
	}

	// --- 滚动文件 + stdout ---
	currentDate := time.Now().Format("20060102")
	fileWriter := &lumberjack.Logger{
		Filename:   filepath.Join(fullLogDir, "policy-service-"+currentDate+".log"),
		MaxSize:    100,
		MaxBackups: 30,
		MaxAge:     30,
		Compress:   true,
		LocalTime:  true,
	}
	mw := io.MultiWriter(fileWriter, os.Stdout)
	Logger.SetOutput(mw)
	Logger.SetFormatter(&logrus.JSONFormatter{
		TimestampFormat: time.RFC3339,
	})

	// --- 解析环境变量里的多个级别 ---
	if levelConf == "" {
		levelConf = "info"
	}
	levelStrs := strings.Split(levelConf, ",")
	var desired []logrus.Level
	for _, s := range levelStrs {
		if lvl, err := logrus.ParseLevel(strings.TrimSpace(s)); err == nil {
			desired = append(desired, lvl)
		} else {
			Logger.Warnf("忽略无效日志级别：%q", s)
		}
	}
	if len(desired) == 0 {
		desired = []logrus.Level{logrus.InfoLevel}
	}

	// --- 在 desired 里找到“数值最大的那个”（也就是最低阈值） ---
	threshold := desired[0]
	for _, lvl := range desired[1:] {
		if lvl > threshold {
			threshold = lvl
		}
	}
	Logger.SetLevel(threshold)
	Logger.Infof("日志阈值已设置为 %s", threshold.String())
}