package wechat

import (
	"net/url"
)

func keyMini(appid string) string {
	return "wechat:mini:" + appid
}

// NewMiniClient new mini client
func NewMiniClient(appID, appSecret string) *MiniClient {
	key := keyMini(appID)
	if v, ok := cache.Load(key); ok {
		return v.(*MiniClient)
	}
	c := &MiniClient{AppID: appID, AppSecret: appSecret}
	cache.Store(key, c)
	return c
}

// GetMiniOpenID get openid by code
func (wc *MiniClient) GetMiniOpenID(frm FormCode) (openid string, err error) {
	uri := BaseURL + "/sns/jscode2session?"

	args := url.Values{}
	args.Add("grant_type", "authorization_code")
	args.Add("appid", wc.AppID)
	args.Add("secret", wc.AppSecret)
	args.Add("js_code", frm.Code)

	uri += args.Encode()
	var res Response
	if res, err = getJSON(uri); err == nil {
		openid = res.OpenID
	}
	return
}