package server

import (
	"bytes"
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"io/ioutil"
	"log"
	"net/http"
	"net/url"
	"os"
	"reflect"
	"strconv"
	"strings"

	httptransport "github.com/go-kit/kit/transport/http"
)

func (err Response) Error() string {
	b, _ := json.Marshal(err)
	return string(b)
}

func validateAPIToken(r *http.Request, clientid string) (interface{}, error) {
	//验证token是否有效
	headerAuth := r.Header.Get("Authorization")
	authArr := strings.Split(headerAuth, " ")
	if len(authArr) != 2 {
		return nil, Response{
			Errno:  1003,
			Errmsg: "auth failed",
		}
	}
	if authArr[0] != "Bearer" {
		return nil, Response{
			Errno:  1004,
			Errmsg: "wrong auth method",
		}
	}
	if err := ValidateToken(authArr[1], clientid); err != nil {
		return nil, Response{
			Errno:  1005,
			Errmsg: err.Error(),
		}
	}
	return nil, nil

}

func touchSessionToken(r *http.Request) {
	sessionId := r.Header.Get("SESSIONID")
	if sessionId != "" {
		go func() {
			_, err := TouchSessionToken(sessionId)
			if err != nil {
				log.Println(err)
			}
		}()
	}
}

// DecodeRequest decodes the request from the provided HTTP request, simply
// by JSON decoding from the request body. It's designed to be used in
// transport/http.Server.
func DecodeRequest(r *http.Request, ptype reflect.Type, shouldLogin ...bool) (interface{}, error) {
	var pl interface{}
	if ptype == nil {
		pl = make(map[string]interface{})
	} else {
		pl = reflect.New(ptype).Interface()
	}

	var reqItem = Request{
		Payload: pl,
	}
	//TODO 优化reader sync.Pool
	buf, _ := ioutil.ReadAll(r.Body)
	log.Println(r.RequestURI, string(buf))
	err := json.NewDecoder(bytes.NewReader(buf)).Decode(&reqItem)
	if err != nil {
		return nil, Response{
			Errno:  101,
			Errmsg: err.Error(), //"wrong json fromat",
		}
	}
	//attach defualt wx_type
	if reqItem.Extra == nil {
		reqItem.Extra = map[string]interface{}{}
	}
	if _, ok := reqItem.Extra["wx_type"]; !ok {
		reqItem.Extra["wx_type"] = ""
	}
	if reqItem.ClientId == "" {
		return nil, Response{
			Errno:  100,
			Errmsg: "param clientid required",
		}
	}
	//验证token是否有效
	_, err = validateAPIToken(r, reqItem.ClientId)
	if err != nil {
		return nil, err
	}
	/*headerAuth := r.Header.Get("Authorization")
	authArr := strings.Split(headerAuth, " ")
	if len(authArr) != 2 {
		return nil, Response{
			Errno:  1003,
			Errmsg: "auth failed",
		}
	}
	if authArr[0] != "Bearer" {
		return nil, Response{
			Errno:  1004,
			Errmsg: "wrong auth method",
		}
	}
	if err := ValidateToken(authArr[1]); err != nil {
		return nil, Response{
			Errno:  1005,
			Errmsg: err.Error(),
		}
	}*/
	//根据sessionid 判断若用户已经登录，则刷新登录token
	//touchSessionToken(r)
	//判断是否需要登录
	if len(shouldLogin) > 0 && shouldLogin[0] {
		//验证是否已经登录
		sessionId := r.Header.Get("SESSIONID")
		if sessionId == "" {
			return nil, Response{
				Errno:  1006,
				Errmsg: "miss session param",
			}
		}
		stoken, err := GetLoginSession(sessionId)
		if err != nil {
			return nil, Response{
				Errno:  1007,
				Errmsg: "user should login",
			}
		}
		udata := stoken.Data.(string)
		udatas := strings.Split(udata, "-")
		if len(udatas) >= 2 {
			uid, _ := strconv.ParseInt(udatas[0], 10, 0)
			reqItem.UserId = int(uid)
			fmt.Println(udata, reqItem.UserId)
			reqItem.Mobile = udatas[1]
		}
	}
	return reqItem, err
}

// EncodeResponse encodes the response to the provided HTTP response
// writer, simply by JSON encoding to the writer. It's designed to be used in
// transport/http.Server.
func EncodeResponse(ctx context.Context, w http.ResponseWriter, response interface{}) error {
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	wr := io.MultiWriter(w, os.Stdout)
	jencoder := json.NewEncoder(wr)
	jencoder.SetEscapeHTML(false)
	return jencoder.Encode(response)
}

// 20220719 不打印日志，部分信息并没有太大意义。免得日志文件增长过快
func EncodeResponseNoLog(ctx context.Context, w http.ResponseWriter, response interface{}) error {
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	//wr := io.MultiWriter(w, os.Stdout)
	jencoder := json.NewEncoder(w)
	jencoder.SetEscapeHTML(false)
	return jencoder.Encode(response)
}

func MakeDecodeRequest(ptype reflect.Type, shouldLogin ...bool) httptransport.DecodeRequestFunc {
	return func(ctx context.Context, r *http.Request) (interface{}, error) {
		return DecodeRequest(r, ptype, shouldLogin...)
	}
}

// EncodeRequest encodes the request to the provided HTTP request, simply
// by JSON encoding to the request body. It's designed to be used in
// transport/http.Client.
func EncodeRequest(r *http.Request, request interface{}) error {
	var buf bytes.Buffer
	if err := json.NewEncoder(&buf).Encode(request); err != nil {
		return err
	}
	r.Body = ioutil.NopCloser(&buf)
	return nil
}

// DecodeResponse decodes the response from the provided HTTP response,
// simply by JSON decoding from the response body. It's designed to be used in
// transport/http.Client.
func DecodeResponse(resp *http.Response, payload interface{}) (interface{}, error) {
	return nil, nil
}

func DecodeAuthRequest(ctx context.Context, req *http.Request) (interface{}, error) {
	rbytes, err := ioutil.ReadAll(req.Body)
	if err != nil {
		return nil, err
	}
	strReqData := string(rbytes)
	kv, err := url.ParseQuery(strReqData)
	if err != nil {
		return nil, err
	}
	tokenStr := kv.Get("assertion")
	if tokenStr == "" {
		return nil, errors.New("request auth data not found")
	}
	return tokenStr, nil
}

func DecodeFileRequest(ctx context.Context, req *http.Request) (interface{}, error) {
	touchSessionToken(req)
	clientId := req.Header.Get("clientid")
	if clientId == "" {
		return nil, Response{
			Errno:  100,
			Errmsg: "param clientid required",
		}
	}
	_, err := validateAPIToken(req, clientId)
	if err != nil {
		return nil, err
	}
	req.ParseForm()
	file, _, _ := req.FormFile("file")
	return file, nil
}