package middleware

import (
	"fmt"
	"net/http"
	"runtime"
	"strings"
	"time"

	"git.shuncheng.lu/bigthing/gocommon/pkg/internal/util"

	"git.shuncheng.lu/bigthing/gocommon/pkg/logger"
	"git.shuncheng.lu/bigthing/gocommon/pkg/trace"

	"git.shuncheng.lu/bigthing/gocommon/pkg/net/engines"
)

// 记录响应时常
func AccessLogMiddleware() engines.HandlerFunc {
	return func(c *engines.Context) {
		var (
			beginTime  = time.Now()
			statusCode = http.StatusOK
		)
		defer func() {
			// recover 一定要在最上面，同时记录错误的堆栈信息，记住堆栈信息从下往上看是调用过程
			if err := recover(); err != nil {
				statusCode = http.StatusInternalServerError
				stackBuffer := make([]byte, 64<<10) // 最多打印64k的堆栈信息
				stackBuffer = stackBuffer[:runtime.Stack(stackBuffer, false)]
				logger.Errorc(c, "[AccessLogMiddleware] panic err, path: %s, panic_info: %+v, stack trace:\n %s", c.Request.URL.Path, err, stackBuffer)
			}

			// spend time
			duration := time.Now().Sub(beginTime)

			// 超过20s 记录504 todo 变更可以进行设置
			if duration.Seconds() >= 20 {
				statusCode = http.StatusGatewayTimeout
				logger.Errorc(c, "[AccessLogMiddleware] timeout, path: %s, spend: %.4fs", c.Request.URL.Path, duration.Seconds())
			}

			// 记录access log
			logger.AccessInfof(`%s %s %s [%s] "%s %s %s" %d %s %d`,
				c.ClientIP(),
				"-",
				"-",
				time.Now().Format("02/Jan/2006:15:04:05 -0700"),
				c.Request.Method,
				c.Request.URL.Path,
				c.Request.Proto,
				statusCode,
				"0",
				int64(duration/time.Millisecond)+1, // 加1毫秒，防止go整除舍去导致记录为0
			)
		}()

		c.Next()
	}
}

// 添加trace-id
func AddTraceId() engines.HandlerFunc {
	return func(ctx *engines.Context) {
		traceIds := make([]string, 0, 2)
		skyWalkingTraceId := trace.GinGetTraceId(ctx)
		zipKinTraceId := getZipKinTraceId(ctx)
		if skyWalkingTraceId != "" {
			traceIds = append(traceIds, "s:"+skyWalkingTraceId)
		}
		if zipKinTraceId != "" {
			traceIds = append(traceIds, "z:"+zipKinTraceId)
		}
		if len(traceIds) == 0 {
			traceIds = append(traceIds, logger.GenerateTraceId())
		}
		ctx.Set(logger.TraceIdKey, strings.Join(traceIds, ","))
		ctx.Next()
	}
}

func getZipKinTraceId(ctx *engines.Context) string {
	return ctx.Request.Header.Get("x-b3-traceid")
}

//添加 skywalking
func SkyWalkingTracerMiddleware(engine *engines.Engine) engines.HandlerFunc {
	return func(ctx *engines.Context) {
		trace.GinMiddleware(engine, trace.GetSkyWalkingTracer())(ctx)
	}
}

/**
必须全部绑定，不然抛出异常(同时解码header，使用url_decoder)
*/
func MustBindHeaderMiddleware(headers ...string) func(ctx *engines.Context) {
	return func(ctx *engines.Context) {
		if headers == nil || len(headers) == 0 {
			ctx.Next()
			return
		}
		result, _ := ctx.Value(util.HeaderData).(map[string]string)
		if result == nil {
			result = make(map[string]string, len(headers))
		}
		for _, elem := range headers {
			header := ctx.GetHeader(elem)
			if header == "" {
				_ = ctx.JSON(util.HttpStatus, util.NewFailMessageHttpResponse(fmt.Sprintf("must bind header %s find err", elem)))
				ctx.Abort()
				return
			}
			result[header] = util.UrlDecode(elem)
		}
		ctx.Set(util.HeaderData, result)
		logger.Infoc(ctx, "[Middleware]  MustBindHeaderMiddleware  end, bind data: %v", result)
		ctx.Next()
		return
	}
}

/**
不需要全部绑定
*/
func ShouldBindHeaderMiddleware(headers ...string) func(ctx *engines.Context) {
	return func(ctx *engines.Context) {
		if headers == nil || len(headers) == 0 {
			ctx.Next()
			return
		}
		result, _ := ctx.Value(util.HeaderData).(map[string]string)
		if result == nil {
			result = make(map[string]string, len(headers))
		}
		for _, elem := range headers {
			header := ctx.GetHeader(elem)
			result[header] = util.UrlDecode(elem)
		}
		ctx.Set(util.HeaderData, result)
		logger.Infoc(ctx, "[Middleware]  ShouldBindHeaderMiddleware  end, bind data: %v", result)
		ctx.Next()
		return
	}
}