// config.js

let path = require('path');

// 日志根目錄
let baseLogPath = path.resolve(__dirname, '../../../logs');
// 請求日志目錄
let reqPath = '/request';
// 請求日志文件名
let reqFileName = 'request';
// 請求日志

// 先安裝log4js

// log4.js

const log4Config = require('./config')
const log4js = require('log4js')

// 調用配置文件
log4js.configure(log4Config)


class CommonHandle {
 constructor(){}
 // 格式化請求日志
 static formatReqLog(ctx, time){
 let text = '------------request start------------'
 let method = ctx.method
 text += `request method: ${method} \n request url: ${ctx.originalUrl } \n`

 if(method = 'GET'){
 text += `request data: ${JSON.stringify(ctx.query)} \n`
 }else{
 text += `request data: ${JSON.stringify(ctx.body)} \n`
 }
 text += `ctx all: ${JSON.stringify(ctx)}`
 return text
 }
 // 格式化相應日志
 static formatResLog(ctx,time){
 let text = '------------response start------------'
 text += `response result: ${JSON.stringify(ctx.response.body)} \n`

 text += `response all: ${JSON.stringify(ctx)} \n`

 text += `response time: ${time} \n`
 return text
 }
 // 格式化錯誤日志
 static formatErrorLog(ctx,error,time){
 let text = '------------error start------------'
 text += this.formatResLog(ctx,time)
 text += `error content: ${JSON.stringify(error)}`

 return text
 }
}

class HandleLogger extends CommonHandle{
 constructor(){
 super()
 }

 // 請求日志
 static reqLogger(ctx){
 log4js.getLogger('reqLogger').info(this.formatReqLog(ctx))
 }

 // 相應日志
 static resLogger(ctx, time){
 log4js.getLogger('resLogger').info(this.formatResLog(ctx,time))
 }

 // 錯誤日志
 static errorLogger(ctx, error, time){
 log4js.getLogger('errLogger').info(this.formatErrorLog(ctx,error,time))
 }

}





module.exports = (options) => {
 return async (ctx,next) => {
 const startTime = new Date()
 let period;
 try{
 // 請求日志
 HandleLogger.reqLogger(ctx)
 await next()
 period = new Date() - startTime
 // 響應日志
 HandleLogger.resLogger(ctx,period)
 }catch(err){
 period = new Date() - startTime
 // 錯誤日志
 HandleLogger.errorLogger(ctx, err, period)
 }
 }
}

// app.js

const Koa = require('koa')
const app = new Koa()
const LogJS = require('./common/log/log4')

// log4.js引入
app.use(LogJS())