package middleware

import (
	"bytes"
	"fmt"
	"gitee.com/wuzheng0709/backend-gopkg/infrastructure/pkg/code"
	"gitee.com/wuzheng0709/backend-gopkg/infrastructure/pkg/gin/log"
	"github.com/getsentry/sentry-go"
	"github.com/gin-gonic/gin"
	"go.uber.org/zap"
	"io/ioutil"
	"runtime"
)

var (
	dunno     = []byte("???")
	centerDot = []byte("·")
	dot       = []byte(".")
	slash     = []byte("/")
)

// RecoveryMiddleware 崩溃恢复中间件

func RecoveryMiddleware() gin.HandlerFunc {
	logger := zap.L()
	return log.Recovery(logger, true)
}
func RecoveryMiddlewareOld() gin.HandlerFunc {
	return func(c *gin.Context) {
		defer func() {
			if err := recover(); err != nil {
				stack := stack(3)
				sentry.CaptureMessage(string(stack))
				log.Info(string(stack))
				c.JSON(500, gin.H{"code": code.Crash_Error, "msg": "发生错误,已自动上报,正在修复中"})
				c.Abort()
				return
			}
		}()
		c.Next()
	}
}

// stack returns a nicely formatted stack frame, skipping skip frames.
func stack(skip int) []byte {
	buf := new(bytes.Buffer)
	var lines [][]byte
	var lastFile string
	for i := skip; ; i++ {
		pc, file, line, ok := runtime.Caller(i)
		if !ok {
			break
		}
		_, err := fmt.Fprintf(buf, "%s:%d (0x%x)\n", file, line, pc)
		if err != nil {
			continue
		}
		if file != lastFile {
			data, err := ioutil.ReadFile(file)
			if err != nil {
				continue
			}
			lines = bytes.Split(data, []byte{'\n'})
			lastFile = file
		}
		_, err = fmt.Fprintf(buf, "\t%s: %s\n", function(pc), source(lines, line))
		if err != nil {
			continue
		}
	}
	return buf.Bytes()
}

// source returns a space-trimmed slice of the n'th line.
func source(lines [][]byte, n int) []byte {
	n-- // in stack trace, lines are 1-indexed but our array is 0-indexed
	if n < 0 || n >= len(lines) {
		return dunno
	}
	return bytes.TrimSpace(lines[n])
}

// function returns, if possible, the name of the function containing the PC.
func function(pc uintptr) []byte {
	fn := runtime.FuncForPC(pc)
	if fn == nil {
		return dunno
	}
	name := []byte(fn.Name())
	if lastslash := bytes.LastIndex(name, slash); lastslash >= 0 {
		name = name[lastslash+1:]
	}
	if period := bytes.Index(name, dot); period >= 0 {
		name = name[period+1:]
	}
	name = bytes.Replace(name, centerDot, dot, -1)
	return name
}