package weixin

import (
	"fmt"
	"github.com/tidwall/gjson"
	"io"
	"net/http"
	"sync"
	"time"
)

const (
	code2AccessTokenUrl  string = "https://api.weixin.qq.com/sns/oauth2/access_token"
	jscode2SessionUrl    string = "https://api.weixin.qq.com/sns/jscode2session"
	accessTokenUrl       string = "https://api.weixin.qq.com/cgi-bin/token"
	userPhoneNumberUrl   string = "https://api.weixin.qq.com/wxa/business/getuserphonenumber"
	getWxACodeUnLimitUrl string = "https://api.weixin.qq.com/wxa/getwxacodeunlimit"
	code2UserinfoUrl     string = "https://api.weixin.qq.com/sns/userinfo"
	oaQrCodeCreateUrl    string = "https://api.weixin.qq.com/cgi-bin/qrcode/create"
	userInfoByOpenid     string = "https://api.weixin.qq.com/cgi-bin/user/info"
)

type UserInfo struct {
	Openid      string
	Unionid     string
	AccessToken string
	Nickname    string
	HeadUrl     string
	Sex         int //1:为男性 2位女性
	Country     string
	City        string
	Province    string
}

type BaseSdk struct {
	appid       string
	secret      string
	accessToken string
	expireIn    int64
	lock        sync.Mutex
}

func (o *BaseSdk) getAccessToken() (string, error) {
	o.lock.Lock()
	defer o.lock.Unlock()
	if time.Now().Unix() < o.expireIn {
		return o.accessToken, nil
	}

	// 获取一个新token
	url := fmt.Sprintf("%s?grant_type=client_credential&appid=%s&secret=%s", accessTokenUrl, o.appid, o.secret)
	res, err := http.Get(url)
	if err != nil {
		return "", err
	}
	defer res.Body.Close()
	body, err := io.ReadAll(res.Body)
	if err != nil {
		return "", err
	}
	g := gjson.ParseBytes(body)

	accessToken := g.Get("access_token").String()
	if accessToken == "" {
		return "", fmt.Errorf("%d:%s", g.Get("errcode").Int(), g.Get("errmsg").String())
	}
	o.accessToken = accessToken
	o.expireIn = time.Now().Unix() + g.Get("expires_in").Int() - 10
	return o.accessToken, nil
}

func (o *BaseSdk) getUserInfoByCode(code string) (*UserInfo, error) {
	url := fmt.Sprintf("%s?appid=%s&secret=%s&code=%s&grant_type=authorization_code",
		code2AccessTokenUrl, o.appid, o.secret, code)
	res, err := http.Get(url)
	if err != nil {
		return nil, err
	}
	defer res.Body.Close()
	body, err := io.ReadAll(res.Body)
	if err != nil {
		return nil, err
	}

	g := gjson.ParseBytes(body)

	errcode := g.Get("errcode").Int()
	if errcode != 0 {
		return nil, fmt.Errorf("%d:%s", errcode, g.Get("errmsg").String())
	}

	var user UserInfo
	user.Unionid = g.Get("unionid").String()
	user.AccessToken = g.Get("access_token").String()
	user.Openid = g.Get("openid").String()

	err = o.getUserInfo(&user)
	if err != nil {
		return nil, err
	}

	return &user, nil
}

func (o *BaseSdk) getUserInfo(user *UserInfo) error {
	url := fmt.Sprintf("%s?access_token=%s&openid=%s&lang=zh_CN",
		code2UserinfoUrl, user.AccessToken, user.Openid)
	res, err := http.Get(url)
	if err != nil {
		return err
	}
	defer res.Body.Close()
	body, err := io.ReadAll(res.Body)
	if err != nil {
		return err
	}

	g := gjson.ParseBytes(body)
	errcode := g.Get("errcode").Int()
	if errcode != 0 {
		return fmt.Errorf("%d:%s", errcode, g.Get("errmsg").String())
	}

	user.Unionid = g.Get("unionid").String()
	user.Nickname = g.Get("nickname").String()
	user.HeadUrl = g.Get("headimgurl").String()
	user.Province = g.Get("province").String()
	user.City = g.Get("city").String()
	user.Country = g.Get("country").String()
	user.Sex = int(g.Get("sex").Int())
	return nil
}