package log

import (
	"go.uber.org/zap"
	"go.uber.org/zap/zapcore"
	"gopkg.in/natefinch/lumberjack.v2"
	"os"
	"time"
)

func NewLog(console, env, lv, lp string) *zap.Logger {
	//目录不存在则创建
	if _, err := os.Stat(lp); err != nil {
		err := os.MkdirAll(lp, os.ModePerm)
		if err != nil {
			panic(err)
		}
	}

	var level zapcore.Level
	//debug<info<warn<error<fatal<panic
	switch lv {
	case "debug":
		level = zap.DebugLevel
	case "info":
		level = zap.InfoLevel
	case "warn":
		level = zap.WarnLevel
	case "error":
		level = zap.ErrorLevel
	default:
		level = zap.InfoLevel
	}
	//创建了一个 lumberjack.Logger 实例，用于配置日志文件的存储。
	hook := lumberjack.Logger{
		Filename:   lp,   // Log file path 日志文件的路径
		MaxSize:    1024, // Maximum size unit for each log file: M 每个日志最大大小
		MaxBackups: 30,   // The maximum number of backups that can be saved for log files 可以保存的日志文件数量
		MaxAge:     7,    // Maximum number of days the file can be saved 日志文件保存的最大天数
		Compress:   true, // Compression or not 是否对日志文件进行压缩
	}

	//encoder：这是一个 zapcore.Encoder 实例，用于定义日志的格式。
	//定义一个打印格式 json还是console
	//console := "console"
	var encoder zapcore.Encoder
	if console == "console" {
		encoder = zapcore.NewConsoleEncoder(zapcore.EncoderConfig{
			TimeKey:        "ts",
			LevelKey:       "level",
			NameKey:        "Logger",
			CallerKey:      "caller",
			MessageKey:     "msg",
			StacktraceKey:  "stacktrace",
			LineEnding:     zapcore.DefaultLineEnding,
			EncodeLevel:    zapcore.LowercaseColorLevelEncoder,
			EncodeTime:     timeEncoder,
			EncodeDuration: zapcore.SecondsDurationEncoder,
			EncodeCaller:   zapcore.FullCallerEncoder,
		})
	} else {
		encoder = zapcore.NewJSONEncoder(zapcore.EncoderConfig{
			TimeKey:        "ts",
			LevelKey:       "level",
			NameKey:        "logger",
			CallerKey:      "caller",
			FunctionKey:    zapcore.OmitKey,
			MessageKey:     "msg",
			StacktraceKey:  "stacktrace",
			LineEnding:     zapcore.DefaultLineEnding,
			EncodeLevel:    zapcore.LowercaseLevelEncoder,
			EncodeTime:     zapcore.EpochTimeEncoder,
			EncodeDuration: zapcore.SecondsDurationEncoder,
			EncodeCaller:   zapcore.ShortCallerEncoder,
		})
	}
	core := zapcore.NewCore(
		encoder,
		//通过（NewMultiWriteSyncer）它将日志输出到多个目标。
		//zapcore.NewMultiWriteSyncer(zapcore.AddSync(os.Stdout), zapcore.AddSync(&hook)), // 同时讲日志输出到控制台和文件
		zapcore.NewMultiWriteSyncer(zapcore.AddSync(&hook)), // Print to file
		level,
	)
	//定义一个环境生产环境还是开发环境
	//env := "local"
	var log *zap.Logger

	if env != "prod" {
		// 开发模式下 Zap 会记录更详细的日志信息，包括调用者信息和错误级别的堆栈跟踪
		log = zap.New(core, zap.Development(), zap.AddCaller(), zap.AddStacktrace(zap.ErrorLevel))
	} else {
		//如果是生产环境，创建一个 Logger 实例，仅记录调用者信息和错误级别的堆栈跟踪
		log = zap.New(core, zap.AddCaller(), zap.AddStacktrace(zap.ErrorLevel))
	}
	zap.ReplaceGlobals(log)

	return log
}

// timeEncoder 格式化一下当前实际
func timeEncoder(t time.Time, enc zapcore.PrimitiveArrayEncoder) {
	//enc.AppendString(t.Format("2006-01-02 15:04:05"))
	enc.AppendString(t.Format("2006-01-02 15:04:05.000000000"))
}