package elmapi

import (
	"crypto/md5"
	"fmt"
	"io/ioutil"
	"net/http"
	"net/url"
	"sort"
	"strings"
	"time"

	"git.rosy.net.cn/baseapi/platform/common"
	"git.rosy.net.cn/baseapi/utils"
	"go.uber.org/zap"
)

const (
	clientTimeout                     = time.Second * 10
	sleepSecondWhenLimited            = 6 * time.Second
	maxRetryCountWhenNetworkException = 3
	maxRetryCountWhenReachLimited     = 10
)

const (
	ELM_API_URL_SANDBOX = "https://open-api-sandbox.shop.ele.me/api/v1/"
	ELM_API_URL_PROD    = "https://open-api.shop.ele.me/api/v1/"
	signKey             = "signature"
)

type ELMResult struct {
	Id     string
	Result interface{}
	Error  map[string]interface{}
}

type ELMAPI struct {
	token       string
	appKey      string
	secret      string
	sugarLogger *zap.SugaredLogger
	url         *url.URL
	client      *http.Client
}

type ELMPayload struct {
	Token     string                 `json:"token"`
	Nop       string                 `json:"nop"`
	Metas     map[string]interface{} `json:"metas"`
	Params    map[string]interface{} `json:"params"`
	Action    string                 `json:"action"`
	Id        string                 `json:"id"`
	Signature string                 `json:"signature"`
}

func NewELMAPI(token, appKey, secret string, sugarLogger *zap.SugaredLogger, isProd bool) *ELMAPI {
	api := &ELMAPI{
		token:       token,
		appKey:      appKey,
		secret:      secret,
		sugarLogger: sugarLogger,
		client:      &http.Client{Timeout: clientTimeout},
	}

	if isProd {
		api.url, _ = url.Parse(ELM_API_URL_PROD)
	} else {
		api.url, _ = url.Parse(ELM_API_URL_SANDBOX)
	}
	return api
}

func (e *ELMAPI) signParamsMap(mapData map[string]interface{}, prefix string) string {
	keyValues := make([]string, 0)
	for k, v := range mapData {
		if k != signKey {
			vBytes := utils.MustMarshal(v)
			keyValues = append(keyValues, k+"="+string(vBytes))
		}
	}

	sort.Strings(keyValues)
	finalStr := prefix + strings.Join(keyValues, "") + e.secret
	// e.sugarLogger.Debugf("sign str:%v", finalStr)
	return fmt.Sprintf("%X", md5.Sum([]byte(finalStr)))
}

func (e *ELMAPI) signParams(action string, payload *ELMPayload) string {
	mapData := utils.MergeMaps(payload.Metas, payload.Params)
	return e.signParamsMap(mapData, action+e.token)
}

func (e *ELMAPI) AccessELM(action string, params map[string]interface{}) (retVal *ELMResult, err error) {
	if params == nil {
		params = make(map[string]interface{}, 0)
	}
	metas := map[string]interface{}{
		"app_key":   e.appKey,
		"timestamp": utils.GetCurTimestamp(),
	}

	payload := &ELMPayload{
		Token:  e.token,
		Nop:    "1.0.0",
		Metas:  metas,
		Params: params,
		Action: action,
		Id:     utils.GetUUID(),
	}

	payload.Signature = e.signParams(action, payload)

	apiAccess := &common.AccessPlatformAPIWithRetryParams{
		MaxExceedLimitRetryCount:   maxRetryCountWhenReachLimited,
		MaxRecoverableRetryCount:   maxRetryCountWhenNetworkException,
		SleepSecondWhenExceedLimit: sleepSecondWhenLimited,
		Client: e.client,
		Request: &http.Request{
			Method: "POST",
			URL:    e.url,
			Header: http.Header{
				"Content-Type":     []string{"application/json; charset=utf-8"},
				"Content-Encoding": []string{"gzip, deflate"},
				"User-Agent":       []string{"eleme-golang-api"},
				// "x-eleme-requestid": []string{payload.Id},
			},

			Body: ioutil.NopCloser(strings.NewReader(string(utils.MustMarshal(payload)))),
		},
		SugarLogger: e.sugarLogger,
	}

	err = common.AccessPlatformAPIWithRetry(apiAccess, func(response *http.Response) (result string, err error) {
		jsonResult1, err := utils.HttpResponse2Json(response)
		if err != nil {
			e.sugarLogger.Warnf("HttpResponse2Json return:%v", err)
			return common.PAErrorLevelGeneralFail, err
		}
		resultError, _ := jsonResult1["error"].(map[string]interface{})
		retVal = &ELMResult{
			Id:     jsonResult1["id"].(string),
			Error:  resultError,
			Result: jsonResult1["result"],
		}
		errinfoMap := retVal.Error
		if errinfoMap == nil {
			return common.PAErrorLevelSuccess, nil
		}
		errCode := errinfoMap["code"].(string)

		if errCode == "EXCEED_LIMIT" {
			return common.PAErrorLevelExceedLimit, nil
		} else if errCode == "SERVER_ERROR" || errCode == "BIZ_SYSTEM_ERROR" || errCode == "BIZ_1006" || errCode == "BUSINESS_ERROR" {
			return common.PAErrorLevelRecoverable, nil
		} else {
			return errCode, nil
		}
	})

	return retVal, err
}