package logger

import (
	"net"
	"net/http"
	"net/http/httputil"
	"os"
	"runtime/debug"
	"strings"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/natefinch/lumberjack"
	"github.com/spf13/viper"
	"go.uber.org/zap"
	"go.uber.org/zap/zapcore"
)

func Init() (err error) {
	writerSyncer := getLogWriter(
		viper.GetString("logger.name"),
		viper.GetInt("logger.max_sizes"),
		viper.GetInt("logger.max_age"),
		viper.GetInt("logger.max_backups"),
	)
	encoder := getEncoder()
	var l = new(zapcore.Level)
	err = l.UnmarshalText([]byte(viper.GetString("logger.level")))
	if err != nil {
		return
	}
	core := zapcore.NewCore(encoder, writerSyncer, zapcore.DebugLevel)

	lg := zap.New(core, zap.AddCaller())
	//用 lg 来代替全局 logger
	zap.ReplaceGlobals(lg)
	return
}

func getEncoder() zapcore.Encoder {
	// return zapcore.NewJSONEncoder(zap.NewProductionEncoderConfig())
	encoder := zapcore.EncoderConfig{
		TimeKey:        "ts",
		LevelKey:       "level",
		NameKey:        "logger",
		CallerKey:      "caller",
		FunctionKey:    zapcore.OmitKey,
		MessageKey:     "msg",
		StacktraceKey:  "stacktrace",
		LineEnding:     zapcore.DefaultLineEnding,
		EncodeLevel:    zapcore.CapitalLevelEncoder,
		EncodeTime:     zapcore.ISO8601TimeEncoder,
		EncodeDuration: zapcore.SecondsDurationEncoder,
		EncodeCaller:   zapcore.ShortCallerEncoder,
	}
	// encoder.EncodeTime = zapcore.ISO8601TimeEncoder
	// encoder.EncodeLevel = zapcore.CapitalLevelEncoder
	return zapcore.NewConsoleEncoder(encoder)
}

func getLogWriter(filename string, maxSize int, maxBackups int, maxAge int) zapcore.WriteSyncer {
	lumberjackLogger := &lumberjack.Logger{
		Filename:   filename,
		MaxSize:    maxSize,    // 最大大小，单位是M
		MaxBackups: maxBackups, //最大备份数量，在上个文件达到最大大小时，开始备份文件
		MaxAge:     maxAge,     //最大保持备份天数
		Compress:   false,      //是否压缩
	}
	return zapcore.AddSync(lumberjackLogger)
}

func GinLogger() gin.HandlerFunc {
	return func(c *gin.Context) {
		start := time.Now()
		path := c.Request.URL.Path
		query := c.Request.URL.RawQuery
		ip := c.ClientIP()
		user_agent := c.Request.UserAgent()
		err := c.Errors.ByType(gin.ErrorTypePrivate).String()
		c.Next()

		cost := time.Since(start)

		zap.L().Info(
			path,
			zap.Int("status", c.Writer.Status()),
			zap.String("method", c.Request.Method),
			zap.String("path", path),
			zap.String("query", query),
			zap.String("ip", ip),
			zap.String("user-agent", user_agent),
			zap.String("errors", err),
			zap.Duration("cost", cost),
		)
	}
}

func GinRecovery(stack bool) gin.HandlerFunc {
	return func(c *gin.Context) {
		defer func() {
			if err := recover(); err != nil {
				// Check for a broken connection, as it is not really a
				// condition that warrants a panic stack trace.
				var brokenPipe bool
				if ne, ok := err.(*net.OpError); ok {
					if se, ok := ne.Err.(*os.SyscallError); ok {
						if strings.Contains(strings.ToLower(se.Error()), "broken pipe") || strings.Contains(strings.ToLower(se.Error()), "connection reset by peer") {
							brokenPipe = true
						}
					}
				}

				httpRequest, _ := httputil.DumpRequest(c.Request, false)
				if brokenPipe {
					zap.L().Error(c.Request.URL.Path,
						zap.Any("error", err),
						zap.String("request", string(httpRequest)),
					)
					// If the connection is dead, we can't write a status to it.
					c.Error(err.(error)) // nolint: errcheck
					c.Abort()
					return
				}

				if stack {
					zap.L().Error("[Recovery from panic]",
						zap.Any("error", err),
						zap.String("request", string(httpRequest)),
						zap.String("stack", string(debug.Stack())),
					)
				} else {
					zap.L().Error("[Recovery from panic]",
						zap.Any("error", err),
						zap.String("request", string(httpRequest)),
					)
				}
				c.AbortWithStatus(http.StatusInternalServerError)
			}
		}()
		c.Next()
	}
}