package wechat

import (
	"encoding/json"
	"fmt"
)

var Wechat = &wechat{}

type wechat struct {
	appid  string
	secret string
}

type AuthAccessToken struct {
	AccessToken  string `json:"access_token"`
	ExpiresIn    int64  `json:"expires_in"`
	Openid       string `json:"openid"`
	RefreshToken string `json:"refresh_token"`
	Scope        string `json:"scope"`
}

// InitWechat @Title 初始化
func InitWechat(appid, secret string) *wechat {
	Wechat.appid = appid
	Wechat.secret = secret
	return Wechat
}

// GetOpenId @Title 获取openId
func (w *wechat) GetOpenId(code string) string {
	accessToken, err := w.GetAccessToken(code)
	if err != nil {
		return ""
	}
	return accessToken.Openid
}

// GetAccessToken @Title 获取微信验证结构体
func (w *wechat) GetAccessToken(code string) (*AuthAccessToken, error) {
	res, err := request(get, fmt.Sprintf("https://api.weixin.qq.com/sns/oauth2/access_token?appid=%v&secret=%v&code=%v&grant_type=authorization_code", w.appid, w.secret, code), "")
	if err != nil {
		return nil, err
	}
	result := AuthAccessToken{}
	if err := json.Unmarshal(res, &result); err != nil {
		return nil, err
	}
	return &result, nil
}

type UserInfo struct {
	City       string   `json:"city"`
	Country    string   `json:"country"`
	Headimgurl string   `json:"headimgurl"`
	Nickname   string   `json:"nickname"`
	Openid     string   `json:"openid"`
	Privilege  []string `json:"privilege"`
	Province   string   `json:"province"`
	Sex        uint     `json:"sex"`
	Unionid    string   `json:"unionid"`
}

// GetUserInfo @Title 获取微信登录会员信息
func (w *wechat) GetUserInfo(accessToken, openId string) (*UserInfo, error) {
	res, err := request(get, fmt.Sprintf("https://api.weixin.qq.com/sns/userinfo?access_token=%s&openid=%s&lang=zh_CN", accessToken, openId), "")
	if err != nil {
		return nil, err
	}
	result := UserInfo{}
	if err := json.Unmarshal(res, &result); err != nil {
		return nil, err
	}
	return &result, nil
}