package access_token

import (
	"encoding/json"
	"errors"
	"net/http"
	"time"

	"git.valavala.com/vala/development-kit-sdk/utils"
	"git.valavala.com/vala/development-kit-sdk/wechat-sdk/structs"
)

var wechatStableAccessToken []*structs.WechatStableAccessToken

type wechatStableAccessTokenMgr struct {
}

func NewWechatStableAccessTokenMgr() *wechatStableAccessTokenMgr {
	return &wechatStableAccessTokenMgr{}
}

func (m *wechatStableAccessTokenMgr) GetStableAccessToken(appConf *structs.WechatConf) (string, error) {
	if appConf == nil {
		return "", errors.New("conf is empty")
	}

	for i := range wechatStableAccessToken {
		if wechatStableAccessToken[i].Appid == appConf.AppId {
			if wechatStableAccessToken[i].AccessTokenExpiresAt > time.Now().Unix() && wechatStableAccessToken[i].AccessToken != "" {
				return wechatStableAccessToken[i].AccessToken, nil
			}
			break
		}
	}
	url := "https://api.weixin.qq.com/cgi-bin/stable_token"
	params := map[string]string{
		"grant_type": "client_credential",
		"appid":      appConf.AppId,
		"secret":     appConf.AppSecret,
	}
	body, _ := json.Marshal(params)
	header := map[string]string{
		"Content-Type": "application/json",
	}
	resp, err := utils.HttpRequest(http.MethodPost, url, header, body)
	if err != nil {
		return "", err
	}
	thisToken := &structs.WechatStableAccessToken{}
	_ = json.Unmarshal(resp, thisToken)
	thisToken.AccessTokenExpiresAt = time.Now().Unix() + int64(thisToken.ExpiresIn)
	thisToken.Appid = appConf.AppId
	if thisToken.AccessToken == "" {
		return "", errors.New(appConf.AppId + " access_token is empty")
	}

	var newTokens []*structs.WechatStableAccessToken
	for i := range wechatStableAccessToken {
		if wechatStableAccessToken[i].Appid == appConf.AppId {
			newTokens = append(newTokens, thisToken)
			continue
		}
		newTokens = append(newTokens, wechatStableAccessToken[i])
	}
	wechatStableAccessToken = newTokens

	return thisToken.AccessToken, nil
}