package middleware

import (
	"bytes"
	"io/ioutil"
	"net/http"
	"runtime/debug"
	"time"

	"gitee.com/xuyiping_admin/pkg/logger/zaplog"
	"github.com/gin-gonic/gin"
	"go.uber.org/zap"
)

type responseBodyWriter struct {
	gin.ResponseWriter
	body *bytes.Buffer
}

func (r responseBodyWriter) Write(b []byte) (int, error) {
	r.body.Write(b)
	return r.ResponseWriter.Write(b)
}

// GinLogger 接管gin框架默认的日志
func GinLogger() gin.HandlerFunc {
	return func(c *gin.Context) {
		// 获取 response 内容
		w := &responseBodyWriter{body: &bytes.Buffer{}, ResponseWriter: c.Writer}
		c.Writer = w

		var requestBody []byte
		if c.Request.Body != nil {
			requestBody, _ = ioutil.ReadAll(c.Request.Body)
			c.Request.Body = ioutil.NopCloser(bytes.NewBuffer(requestBody))
		}
		start := time.Now()
		c.Next()
		cost := time.Since(start)
		logFields := []zap.Field{
			zap.Int("status", c.Writer.Status()),
			zap.String("request", c.Request.Method+" "+c.Request.URL.String()),
			zap.String("query", c.Request.URL.RawQuery),
			zap.String("ip", c.ClientIP()),
			zap.String("user-agent", c.Request.UserAgent()),
			zap.String("time", cost.String()),
			zap.String("Request body", string(requestBody)),
			zap.String("Response body", w.body.String()),
			zap.String("x-request-id", c.GetHeader("X-Request-ID")),
		}
		if len(c.Errors) > 0 {
			logFields = append(logFields, zap.Any("stack", string(debug.Stack())))
			zaplog.Error("Http-Access-Error", logFields...)
			c.Abort()
		} else {
			zaplog.Info("Http-Access-Log", logFields...)
		}
	}
}

// GinRecovery recover掉我的项目可能呈现的panic
func GinRecovery(stack bool) gin.HandlerFunc {
	return func(c *gin.Context) {
		defer func() {
			if err := recover(); err != nil {
				body, _ := ioutil.ReadAll(c.Request.Body)
				// 获取 panic 发生的位置
				var stackTrace []byte
				if stack {
					// 获取调用栈
					stackTrace = debug.Stack()
				}
				zaplog.Error("panic",
					zap.Any("recover", err),
					zap.Any("url", c.Request.URL),
					zap.Any("stackTrace", string(stackTrace)),
					zap.Any("request", string(body)),
					zap.String("x-request-id", c.GetHeader("X-Request-ID")),
				)
				c.AbortWithStatus(http.StatusInternalServerError)
				c.Abort()
				return
			}
		}()
		c.Next()
	}
}