package auth

import (
	"fmt"

	"lone-services/pkg/utils"

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

const accessTokenURL = "https://api.weixin.qq.com/cgi-bin/token"

type AccessTokenResult struct {
	AccessToken string `json:"access_token"`
	ExpiresIn   int    `json:"expires_in"`
	ErrCode     int    `json:"errcode"`
	ErrMsg      string `json:"errmsg"`
}

func (c *Client) AccessToken() (*AccessTokenResult, error) {
	if c == nil || c.AppID == utils.StringEmpty || c.Secret == utils.StringEmpty {
		return nil, fmt.Errorf("wechat app config missing")
	}

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

	var result AccessTokenResult
	if err := jsoniter.UnmarshalFromString(body, &result); err != nil {
		return nil, err
	}
	if result.ErrCode != utils.NumberZero {
		return nil, fmt.Errorf("wechat access_token: %d %s", result.ErrCode, result.ErrMsg)
	}
	if result.AccessToken == utils.StringEmpty {
		return nil, fmt.Errorf("wechat access_token empty")
	}
	return &result, nil
}