package cloudbrain

import (
	"encoding/json"
	"errors"
	"io/ioutil"
	"net/http"
	"strings"

	"code.gitea.io/gitea/modules/log"
	"code.gitea.io/gitea/modules/setting"
)

const (
	GrantTypePassword = "password"
	ScopeRead = "read"
	TokenUrl = "/oauth/token"
)

type RespAuth struct {
	AccessToken string `json:"access_token"`
	RefreshToken string `json:"refresh_token"`
	TokenType string `json:"token_type"`
	ExpiresIn int `json:"expires_in"`
	Error string `json:"error"`
	ErrorDescription string `json:"error_description"`
}

type CloudBrainUser struct {
	UserName string `json:"username"`
	Email string `json:"email"`
}

func UserValidate(username string, password string) (string, error) {
	reqHttp := "client_id=" + setting.ClientID + "&client_secret=" + setting.ClientSecret +
		"&grant_type=" + GrantTypePassword + "&scope=" + ScopeRead + "&username=" + username +
		"&password=" + password
	resp, err := http.Post(setting.UserCeterHost + TokenUrl,
		"application/x-www-form-urlencoded",
		strings.NewReader(reqHttp))
	if err != nil {
		log.Error("req user center failed:" + err.Error())
		return "", err
	}

	body,err := ioutil.ReadAll(resp.Body)
	if err != nil {
		log.Error("read resp body failed:" + err.Error())
		return "", err
	}

	var respAuth RespAuth
	err = json.Unmarshal(body, &respAuth)
	if err != nil {
		log.Error("unmarshal resp failed:" + err.Error())
		return "", err
	}

	if respAuth.Error != "" {
		log.Error("req user_center for token failed:" + respAuth.Error + ":" + respAuth.ErrorDescription)
		return "", errors.New(respAuth.ErrorDescription)
	}

	return respAuth.AccessToken, nil
}

func GetUserInfo(username string, token string) (*CloudBrainUser, error) {
	user := &CloudBrainUser{}
	return user, nil
}