package middleware

import (
	"bytes"
	"io/ioutil"

	"net"
	"net/http"
	"net/http/httputil"
	"os"
	"runtime/debug"
	"strings"
	"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("errors", c.Errors.ByType(gin.ErrorTypePrivate).String()),
			zap.String("time", cost.String()),
			zap.String("x-request-id", c.Request.Header.Get("X-Request-Id")),
		}
		logFields = append(logFields, zap.String("Request body", string(requestBody)))
		logFields = append(logFields, zap.String("Response body", w.body.String()))
		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 {
				// 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 {
					zaplog.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 {
					zaplog.Error("[Recovery from panic]",
						zap.Any("error", err),
						zap.String("request", string(httpRequest)),
						zap.String("stack", string(debug.Stack())),
					)
				} else {
					zaplog.Error("[Recovery from panic]",
						zap.Any("error", err),
						zap.String("request", string(httpRequest)),
					)
				}
				c.AbortWithStatus(http.StatusInternalServerError)
			}
		}()
		c.Next()
	}
}