package lxlog

import (
	"fmt"
	"os"
	"runtime"
	"strconv"
	"time"
)

// 异步写日志

var MyLog *FileLog

const (
	LogSplitTypeHour = iota
	LogSplitTypeSize
	logPath  = "myLog"
	logName  = "myLog"
	chanSize = 5000
)

type FileLog struct {
	logPath       string
	logName       string
	file          *os.File //普通日志
	warnFile      *os.File //错误日志 级别低
	logDataChan   chan *LogData
	logSplitType  int   //分割类型
	logSplitSize  int64 //分割体积
	lastSplitHour int   //分割时间
}

type LogData struct {
	Message  string
	TimeStr  string
	LevelStr string
	IsWarn   bool
	File     string
}

// _ = tools.InitLog()
func InitLog() (log *FileLog) {
	config := make(map[string]string, 8)
	config["log_path"] = "."
	config["log_name"] = "server"
	config["log_chan_size"] = "50000" //chan size 可以不用
	config["log_split_type"] = "size"
	config["log_split_size"] = strconv.Itoa(1024 * 1024 * 1024) // 1g
	log, err := NewFileLog(config)
	if err != nil {
		panic("init log err")
	}
	MyLog = log
	return log
}

func NewFileLog(config map[string]string) (logFile *FileLog, err error) {

	var logSplitType = LogSplitTypeSize
	var logSplitSize int64

	splitType, ok := config["log_split_type"]
	if !ok {
		splitType = "hour"
	} else {
		if splitType == "size" {
			splitSize, ok := config["log_split_size"]
			if !ok {
				splitSize = "104857600" //100M 以文字来讲很多了
			}

			logSplitSize, err = strconv.ParseInt(splitSize, 10, 64)
			if err != nil {
				logSplitSize = 104857600
			}

			logSplitType = LogSplitTypeSize
		} else {
			logSplitType = LogSplitTypeHour
		}
	}
	//打开日志文件
	exist, err := PathIsExists(logPath)
	if err != nil {
		fmt.Printf("get dir error![%v]\n", err)
		return
	}
	if !exist {
		err = os.Mkdir(logPath, os.ModePerm)
		if err != nil {
			fmt.Printf("mkdir failed![%v]\n", err)
			return
		} else {
			fmt.Printf("mkdir success!\n")
		}
	}
	//正常日志
	fileName := fmt.Sprintf("%s/%s.log", logPath, logName)
	file, err := os.OpenFile(fileName, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0755)
	//错误日志
	fileNameWarn := fmt.Sprintf("%s/%s.log.err", logPath, logName)
	fileWarn, err := os.OpenFile(fileNameWarn, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0755)
	if err != nil {
		return
	}
	logFile = &FileLog{
		logPath:       logPath,
		logName:       logName,
		logDataChan:   make(chan *LogData, chanSize),
		file:          file,
		warnFile:      fileWarn,
		logSplitType:  logSplitType,
		logSplitSize:  logSplitSize,
		lastSplitHour: time.Now().Hour(),
	}
	go logFile.writeLogBackGround()
	return
}

// 判断文件夹是否存在
func PathIsExists(path string) (bool, error) {
	_, err := os.Stat(path)
	if err == nil {
		return true, nil
	}
	if os.IsNotExist(err) {
		return false, nil
	}
	return false, err
}

func (f *FileLog) Info(message string) {
	_, file, line, _ := runtime.Caller(1)
	fi := file + ":" + strconv.Itoa(line)
	f.print(message, "info", fi)
}
func (f *FileLog) Debug(message string) {
	_, file, line, _ := runtime.Caller(1)
	fi := file + ":" + strconv.Itoa(line)
	f.print(message, "debug", fi)
}
func (f *FileLog) Warn(message string) {
	_, file, line, _ := runtime.Caller(1)
	fi := file + ":" + strconv.Itoa(line)
	f.print(message, "warn", fi)
}
func (f *FileLog) Error(message string) {
	_, file, line, _ := runtime.Caller(1)
	fi := file + ":" + strconv.Itoa(line)
	f.print(message, "error", fi)
}

func (f *FileLog) print(message, Type string, file string) {
	isWarn := false
	if Type == "error" {
		isWarn = true
	}
	msg := &LogData{
		Message:  message,
		TimeStr:  time.Now().Format("2006-01-02 15:04:05"),
		LevelStr: Type,
		IsWarn:   isWarn,
		File:     file,
	}
	// 怕chan满了插不进去
	select {
	case f.logDataChan <- msg:
	default:

	}
}

func (f *FileLog) writeLogBackGround() {
	for logData := range f.logDataChan {
		var file = f.file
		if logData.IsWarn {
			file = f.warnFile
		}

		f.checkSplitFile(logData.IsWarn) // 检查文件分割类型
		fmt.Fprintf(file, "%s %s %s %s\n", logData.TimeStr, logData.LevelStr, logData.Message, logData.File)
	}
}

func (f *FileLog) checkSplitFile(isWarn bool) {
	if f.logSplitType == LogSplitTypeHour {
		f.splitHour(isWarn)
		return
	}
	f.splitSize(isWarn)
}

// 根据时间切割
func (f *FileLog) splitHour(isWarn bool) {

	now := time.Now()
	hour := now.Hour()

	if hour == f.lastSplitHour {
		return
	}

	f.lastSplitHour = hour

	var backupFileName string
	var fileName string

	if isWarn {
		backupFileName = fmt.Sprintf("%s/%s.log.err_%s", f.logPath, f.logName, now.Format("20060102150405"))
		fileName = fmt.Sprintf("%s/%s.log.err", f.logPath, f.logName)
	} else {
		backupFileName = fmt.Sprintf("%s/%s.log_%s", f.logPath, f.logName, now.Format("20060102150405"))
		fileName = fmt.Sprintf("%s/%s.log", f.logPath, f.logName)
	}

	file := f.file
	if isWarn {
		file = f.warnFile
	}
	file.Close()
	os.Rename(fileName, backupFileName)

	file, err := os.OpenFile(fileName, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0755)
	if err != nil {
		return
	}

	if isWarn {
		f.warnFile = file
	} else {
		f.file = file
	}

}

// 根据文件大小来分割
func (f *FileLog) splitSize(isWarn bool) {
	file := f.file
	if isWarn {
		file = f.warnFile
	}
	fileInfo, err := file.Stat() // 可以得到文件的参数
	if err != nil {
		return
	}

	fileSize := fileInfo.Size()
	if fileSize <= f.logSplitSize {
		return
	}

	var backupFileName string
	var fileName string

	now := time.Now()

	if isWarn {
		backupFileName = fmt.Sprintf("%s/%s.log.err_%s", f.logPath, f.logName, now.Format("20060102150405"))
		fileName = fmt.Sprintf("%s/%s.log.err", f.logPath, f.logName)
	} else {
		backupFileName = fmt.Sprintf("%s/%s.log_%s", f.logPath, f.logName, now.Format("20060102150405"))
		fileName = fmt.Sprintf("%s/%s.log", f.logPath, f.logName)
	}

	file.Close()
	os.Rename(fileName, backupFileName)

	file, err = os.OpenFile(fileName, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0755)
	if err != nil {
		return
	}

	if isWarn {
		f.warnFile = file
	} else {
		f.file = file
	}
}