package mtwmapi

import (
	"bytes"
	"crypto/md5"
	"fmt"
	"mime/multipart"
	"net/http"
	"net/url"
	"sort"
	"strings"
	"sync"
	"time"

	"git.rosy.net.cn/baseapi"
	"git.rosy.net.cn/baseapi/platformapi"
	"git.rosy.net.cn/baseapi/utils"
)

const (
	apiURL        = "https://waimaiopen.meituan.com/api/v1"
	sandboxAPIURL = "http://openapi.b.waimai.test.sankuai.com/api/v1"
	signKey       = "sig"
)

const (
	KeyAppPoiCode  = "app_poi_code"
	KeyAppPoiCodes = "app_poi_codes"
	KeyAppFoodCode = "app_food_code"
	KeyImgName     = "img_name"
	KeyImgData     = "img_data"
	KeyOrderID     = "order_id"
)

const (
	resultKeyData       = "data"
	resultKeyMsg        = "msg"
	resultKeySuccessMsg = "success_msg"
)
const (
	GeneralMaxLimit = 200 // 大多数的API的批处理最大条数
)

const (
	ErrCodeSysErr        = 700 // 系统错误，按美团外卖技术支持的说法，可当成需重试的错误
	ErrCodeAccessLimited = 711 // 接口调用过于频繁，触发流控，请降低调用频率

	ErrCodeNoAppFood           = 805  // 不存在此菜品
	ErrCodeNoSuchOrder         = 808  // 不存在此订单
	ErrCodeSkuCategoryNotExist = 1021 // 菜品分类不存在
	ErrCodeSkuCategoryExist    = 1037 // 菜品分类已存在
)

type API struct {
	platformapi.APICookie

	appID       string
	secret      string
	callbackURL string
	client      *http.Client
	config      *platformapi.APIConfig

	locker      sync.RWMutex
	userCookies map[string]string
}

var (
	canRetryCodes = map[int]int{
		ErrCodeSysErr:        1,
		ErrCodeAccessLimited: 1,
	}
)

func New(appID, secret, callbackURL string, config ...*platformapi.APIConfig) *API {
	curConfig := platformapi.DefAPIConfig
	if len(config) > 0 {
		curConfig = *config[0]
	}
	return &API{
		appID:       appID,
		secret:      secret,
		callbackURL: callbackURL,
		client:      &http.Client{Timeout: curConfig.ClientTimeout},
		config:      &curConfig,

		userCookies: make(map[string]string),
	}
}

func (a *API) genURL(cmd string) string {
	return apiURL + "/" + cmd
}

func (a *API) signParams(signURL string, params map[string]interface{}) string {
	keys := make([]string, 0)
	for k := range params {
		if k != signKey {
			keys = append(keys, k)
		}
	}

	sort.Strings(keys)
	finalStr := signURL
	kvPaires := make([]string, len(keys))
	for k, key := range keys {
		if params[key] != nil {
			kvPaires[k] = key + "=" + fmt.Sprintf("%v", params[key])
		}
	}
	finalStr += strings.Join(kvPaires, "&") + a.secret
	// baseapi.SugarLogger.Debug(finalStr)
	return fmt.Sprintf("%x", md5.Sum([]byte(finalStr)))
}

func (a *API) AccessAPI2(cmd string, isGet bool, bizParams map[string]interface{}, resultKey, trackInfo string) (retVal interface{}, err error) {
	params := make(map[string]interface{})
	params["timestamp"] = time.Now().Unix()
	params["app_id"] = a.appID
	params = utils.MergeMaps(params, bizParams)
	imgData := params[KeyImgData]
	if imgData != nil {
		delete(params, KeyImgData)
	}
	signURL := a.genURL(cmd) + "?"
	params[signKey] = a.signParams(signURL, params)
	err = platformapi.AccessPlatformAPIWithRetry(a.client,
		func() *http.Request {
			var request *http.Request
			if isGet {
				fullURL := utils.GenerateGetURL(apiURL, cmd, params)
				// baseapi.SugarLogger.Debug(fullURL)
				request, _ = http.NewRequest(http.MethodGet, fullURL, nil)
			} else {
				fullURL := a.genURL(cmd)
				// baseapi.SugarLogger.Debug(utils.Map2URLValues(params).Encode())
				if imgData == nil {
					request, _ = http.NewRequest(http.MethodPost, fullURL, strings.NewReader(utils.Map2URLValues(params).Encode()))
					request.Header.Set("Content-Type", "application/x-www-form-urlencoded")
				} else {
					var b bytes.Buffer
					w := multipart.NewWriter(&b)
					if fw, err := w.CreateFormFile("file", params[KeyImgName].(string)); err != nil {
						panic(err.Error())
					} else {
						fw.Write(imgData.([]byte))
					}
					for k, v := range params {
						fmt.Println(k, " ", v)
						w.WriteField(k, url.QueryEscape(fmt.Sprint(v)))
					}
					w.Close()
					// b.WriteString(utils.Map2URLValues(params).Encode())
					request, _ = http.NewRequest(http.MethodPost, fullURL, &b)
					request.Header.Set("Content-Type", w.FormDataContentType())
				}
				request.Header.Set("charset", "UTF-8")
			}
			if trackInfo != "" {
				request.Header.Set(platformapi.KeyTrackInfo, trackInfo)
			}
			// request.Close = true //todo 为了性能考虑还是不要关闭
			return request
		},
		a.config,
		func(response *http.Response, bodyStr string, jsonResult1 map[string]interface{}) (errLevel string, err error) {
			if jsonResult1 == nil {
				return platformapi.ErrLevelRecoverableErr, fmt.Errorf("mapData is nil")
			}
			retVal = jsonResult1[resultKey]
			if errObj, ok := jsonResult1["error"]; ok {
				baseapi.SugarLogger.Debugf("mtwm AccessAPI failed, jsonResult1:%s", utils.Format4Output(jsonResult1, true))
				errorInfo := errObj.(map[string]interface{})
				newErr := utils.NewErrorIntCode(errorInfo["msg"].(string), int(utils.MustInterface2Int64(errorInfo["code"])))
				if canRetryCodes[newErr.IntCode()] == 1 {
					return platformapi.ErrLevelExceedLimit, newErr
				}
				return platformapi.ErrLevelCodeIsNotOK, newErr
			}
			return platformapi.ErrLevelSuccess, nil
		})
	err = platformapi.RebuildError(err, bizParams, []string{
		KeyAppPoiCode,
		KeyAppPoiCodes,
		KeyAppFoodCode,
	})
	return retVal, err
}

func (a *API) AccessAPI(cmd string, isGet bool, bizParams map[string]interface{}) (retVal interface{}, err error) {
	return a.AccessAPI2(cmd, isGet, bizParams, resultKeyData, "")
}