package middleware

import (
	"bytes"
	"encoding/json"
	"fmt"
	"git.qianqiusoft.com/qianqiusoft/light-apiengine/config"
	"github.com/gin-gonic/gin"
	"github.com/gocql/gocql"
	"strings"
	"time"
)

var __logInfoChan chan *logInfo
// cassandra 配置
var _clusterCfg *gocql.ClusterConfig = nil
// app名称
var __appName string = ""

func init(){
	defer func() {
		if p := recover(); p != nil {
			fmt.Println("ecover", p)
		}
	}()

	// 设置app名称
	__appName = config.AppConfig.GetKey("app_name")

	__logInfoChan = make(chan *logInfo, 1000)

	// 设置cassandar 配置
	cassandra := config.AppConfig.GetKey("cassandra")
	keyspace := config.AppConfig.GetKey("keyspace")
	_clusterCfg = gocql.NewCluster(strings.Split(cassandra, ",")...)
	_clusterCfg.Keyspace = keyspace
	_clusterCfg.Consistency = gocql.Quorum
	//设置连接池的数量,默认是2个（针对每一个host,都建立起NumConns个连接）
	_clusterCfg.NumConns = 3

	session, err := _clusterCfg.CreateSession()
	if err != nil{
		fmt.Println("create session err", err.Error())
		return
	}
	time.Sleep(1 * time.Second) //Sleep so the fillPool can complete.
	defer session.Close()

	// 日志处理
	logProcess()
}

/**
 * 自定义日志响应类，主要是把resp的响应内容写入到body中
 */
type loggerRespWriter struct{
	gin.ResponseWriter
	respBody *bytes.Buffer
}

// 写字节数组
func (w loggerRespWriter) Write(b []byte) (int, error) {
	w.respBody.Write(b)	// 保存
	return w.ResponseWriter.Write(b)
}

// 写字符串
func (w loggerRespWriter) WriteString(s string) (int, error) {
	w.respBody.WriteString(s)	// 保存
	return w.ResponseWriter.WriteString(s)
}

/**
 * 日志信息
 */
type logInfo struct {
	ReqClientIp string
	ReqTime     time.Time
	ReqMethod   string
	ReqUrl      string
	ReqProto    string
	ReqUa       string
	ReqReferer  string
	ReqPostData string

	RespTime time.Time
	RespBody string
	RespCode string // 由 resp body 解析
	RespMsg  string // 由 resp body 解析
	RespData string // 由 resp body 解析

	CostTime int
}

func LoggerCassandra()gin.HandlerFunc{
	return func(c *gin.Context){
		respWriter := &loggerRespWriter{
			ResponseWriter: c.Writer,
			respBody: bytes.NewBuffer([]byte{}),
		}
		c.Writer = respWriter	// 注入自定writer

		logInfo := &logInfo{}
		logInfo.ReqTime = time.Now()

		// 下一个请求
		c.Next()

		// 设置对象
		logInfo.RespBody = respWriter.respBody.String()
		logInfo.RespTime = time.Now()

		logInfo.ReqMethod = c.Request.Method
		logInfo.ReqUrl = c.Request.RequestURI
		logInfo.ReqProto = c.Request.Proto
		logInfo.ReqUa = c.Request.UserAgent()
		logInfo.ReqReferer = c.Request.Referer()
		logInfo.ReqPostData = c.Request.PostForm.Encode()
		logInfo.ReqClientIp = c.ClientIP()

		__logInfoChan <- logInfo
	}
}

func logProcess(){
	go func(){
		for{
			select {
				case logInfo := <- __logInfoChan:
					insertLogInfo(logInfo)
			}
		}
	}()
}

func insertLogInfo(logInfo *logInfo){
	session, err := _clusterCfg.CreateSession()
	if err != nil{
		fmt.Println("创建cassandra session错误", err.Error())
		return
	}
	defer session.Close()

	var respBodyObj struct {
		Code string
		Msg  string
		Data string
	}
	if logInfo.RespBody != ""{
		err = json.Unmarshal([]byte(logInfo.RespBody), &respBodyObj)
		if err != nil{
			fmt.Println("json.Unmarshal 错误", err.Error())
		}else {
			logInfo.RespCode = respBodyObj.Code
			logInfo.RespMsg = respBodyObj.Msg
			logInfo.RespData = respBodyObj.Data
		}
	}
	logInfo.CostTime = int(logInfo.RespTime.Sub(logInfo.ReqTime))

	// 保存轨迹
	fmt.Println("保存轨迹")
	cqlformat := `insert into 
		log_info(app_name, req_date, req_time, req_method, req_url, req_proto, req_ua, req_referer, req_post_data, resp_time, resp_body, resp_code, resp_msg, resp_data, cost_time) 
		values(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?);`
	reqDate := logInfo.ReqTime.Format("20060102")
	q := session.Query(cqlformat, __appName, reqDate, logInfo.ReqTime.Format("2006-01-02 15:04:05"), logInfo.ReqMethod, logInfo.ReqUrl, logInfo.ReqProto, logInfo.ReqUa, logInfo.ReqReferer, logInfo.ReqPostData, logInfo.RespTime.Format("2006-01-02 15:04:05"), logInfo.RespBody, logInfo.RespCode, logInfo.RespMsg, logInfo.RespData, logInfo.CostTime)
	err = q.Exec()		// 应该可以使用批量插入
	if err != nil{
		fmt.Println("插入日志错误:", err)
		return
	}
}