package auth

import (
	"fmt"

	"lone-services/pkg/utils"

	jsoniter "github.com/json-iterator/go"
)

const code2SessionURL = "https://api.weixin.qq.com/sns/jscode2session"

type Session struct {
	OpenID     string `json:"openid"`
	UnionID    string `json:"unionid"`
	SessionKey string `json:"session_key"`
	ErrCode    int    `json:"errcode"`
	ErrMsg     string `json:"errmsg"`
}

func (c *Client) Code2Session(code string) (*Session, error) {
	if c == nil || c.AppID == utils.StringEmpty || c.Secret == utils.StringEmpty {
		return nil, fmt.Errorf("wechat app config missing")
	}
	if code == utils.StringEmpty {
		return nil, fmt.Errorf("wechat code empty")
	}

	body, err := utils.Curl(code2SessionURL).SetData(map[string]string{
		"appid":      c.AppID,
		"secret":     c.Secret,
		"js_code":    code,
		"grant_type": "authorization_code",
	}).Get("")
	if err != nil {
		return nil, err
	}

	var session Session
	if err := jsoniter.UnmarshalFromString(body, &session); err != nil {
		return nil, err
	}
	if session.ErrCode != utils.NumberZero {
		return nil, fmt.Errorf("wechat code2session: %d %s", session.ErrCode, session.ErrMsg)
	}
	if session.OpenID == utils.StringEmpty {
		return nil, fmt.Errorf("wechat openid empty")
	}
	return &session, nil
}