package log

import (
	"fmt"
	"github.com/natefinch/lumberjack"
	"go.uber.org/zap"
	"go.uber.org/zap/zapcore"
	"os"
)

var (
	defaultLog *SLogger

	defLevel       = zapcore.InfoLevel
	defMaxSize     = 10
	defMaxAge      = 30
	defMaxBackups  = 360
	defCompressing = true

	levelMap = map[string]zapcore.Level{
		"trace":   zapcore.DebugLevel,
		"debug":   zapcore.DebugLevel,
		"info":    zapcore.InfoLevel,
		"warning": zapcore.WarnLevel,
		"error":   zapcore.ErrorLevel,
		"panic":   zapcore.PanicLevel,
		"fatal":   zapcore.FatalLevel,
	}
)

type SLoggerOption func(*SLogger)

func WithSinks(sinks ...zap.Sink) SLoggerOption {
	return func(l *SLogger) {
		l.sinks = sinks
	}
}

func WithConsole(console bool) SLoggerOption {
	return func(l *SLogger) {
		l.console = console
	}
}

func WithCompress(compress bool) SLoggerOption {
	return func(l *SLogger) {
		l.settings.Compress = compress
	}
}

func WithMaxSizeSingleFile(maxsize int) SLoggerOption {
	return func(l *SLogger) {
		if maxsize < 1 {
			maxsize = defMaxSize
		}
		l.settings.MaxSize = maxsize
	}
}

func WithMaxAge(maxage int) SLoggerOption {
	return func(l *SLogger) {
		if maxage < 1 {
			maxage = defMaxAge
		}
		l.settings.MaxAge = maxage
	}
}

func WithMaxBackups(maxbackups int) SLoggerOption {
	return func(l *SLogger) {
		if maxbackups < 1 {
			maxbackups = defMaxBackups
		}
		l.settings.MaxBackups = maxbackups
	}
}

/// means log in a single file

///  默认配置:
///  json 格式
///  单文件最大 10 m
/// 最多保留1个月
/// 压缩备份
type SLogger struct {
	f        string
	lg       *zap.Logger
	settings lumberjack.Logger
	console  bool
	sinks    []zap.Sink
}

// @console: 是否输出到 console
// @path: 路径
// @level: 日志等级
// @sinks: 日志额外的输出
func NewSLogger(path string, level string, options ...SLoggerOption) *SLogger {
	slogger := &SLogger{
		f:  path,
		lg: nil,
		settings: lumberjack.Logger{
			Filename:   path,
			MaxSize:    defMaxSize,    //M
			MaxAge:     defMaxAge,     //d
			MaxBackups: defMaxBackups, //numbers
			Compress:   true,
		},
		console: true,
	}

	for _, opt := range options {
		opt(slogger)
	}

	encoderConf := zapcore.EncoderConfig{
		MessageKey:     "msg",
		LevelKey:       "level",
		TimeKey:        "ts",
		NameKey:        "logger",
		CallerKey:      "caller",
		StacktraceKey:  "trace",
		LineEnding:     zapcore.DefaultLineEnding,
		EncodeLevel:    zapcore.LowercaseLevelEncoder,
		EncodeTime:     zapcore.ISO8601TimeEncoder,
		EncodeDuration: zapcore.SecondsDurationEncoder,
		EncodeCaller:   zapcore.ShortCallerEncoder,
	}
	// level
	corelevel, ok := levelMap[level]
	if !ok {
		fmt.Println("Warning: invalid log level: ", level)
		corelevel = defLevel
	}
	atom := zap.NewAtomicLevelAt(corelevel)
	wss := []zapcore.WriteSyncer{zapcore.AddSync(&slogger.settings)}
	if slogger.console {
		wss = append(wss, zapcore.AddSync(os.Stdout))
	}
	for _, sink := range slogger.sinks {
		wss = append(wss, zapcore.AddSync(sink))
	}
	// writeSyncer
	ws := zapcore.NewMultiWriteSyncer(wss...)
	// core
	core := zapcore.NewCore(zapcore.NewJSONEncoder(encoderConf), ws, atom)
	caller := zap.AddCaller()
	callerSkip := zap.AddCallerSkip(2)
	dev := zap.Development()
	stack := zap.AddStacktrace(zapcore.ErrorLevel)

	slogger.lg = zap.New(core, caller, callerSkip, dev, stack)

	return slogger
}

func (self *SLogger) Debug(msg string, fields ...zap.Field) {
	self.lg.Debug(msg, fields...)
}

func (self *SLogger) Info(msg string, fields ...zap.Field) {
	self.lg.Info(msg, fields...)
}

func (self *SLogger) Warn(msg string, fields ...zap.Field) {
	self.lg.Warn(msg, fields...)
}

func (self *SLogger) Error(msg string, fields ...zap.Field) {
	self.lg.Error(msg, fields...)
}

func (self *SLogger) Panic(msg string, fields ...zap.Field) {
	self.lg.Panic(msg, fields...)
}

func (self *SLogger) Fatal(msg string, fields ...zap.Field) {
	self.lg.Fatal(msg, fields...)
}

func (self *SLogger) Sync() {
	_ = self.lg.Sync()
}

func SetDefaultLogger(logger *SLogger) {
	defaultLog = logger
}

func Debug(msg string, fields ...zap.Field) {
	defaultLog.Debug(msg, fields...)
}

func Info(msg string, fields ...zap.Field) {
	defaultLog.Info(msg, fields...)
}

func Warn(msg string, fields ...zap.Field) {
	defaultLog.Warn(msg, fields...)
}

func Error(msg string, fields ...zap.Field) {
	defaultLog.Error(msg, fields...)
}

func Panic(msg string, fields ...zap.Field) {
	defaultLog.Panic(msg, fields...)
}

func Fatal(msg string, fields ...zap.Field) {
	defaultLog.Fatal(msg, fields...)
}

func Sync() {
	defaultLog.Sync()
}