using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

using Sog;
using LitJson;

namespace HttpProxy
{
    public class GoogleAuth
    {
        private static readonly string AuthUrl = "https://www.googleapis.com/oauth2/v3/tokeninfo?id_token=";


        /// <summary>
        /// 返回验证成功后,如果验证失败返回空
        /// </summary>
        /// <param name="accountid"></param>
        /// <param name="token"></param>
        /// <param name="exception">是否Facebook服务器异常</param>
        /// <returns></returns>
        public static bool AuthToken(string accountid, string token, out bool exception, out string userid, out string name, out string icon, out string email)
        {
            userid = "";
            name = "";
            icon = "";
            email = "";

            string input_token = token;

            //成功,打印一下日志
            TraceLog.Debug("GoogleAuth.AuthToken, start accountid {0}", accountid);

            string fullUrl = AuthUrl + input_token;

            string strRet = HttpUtils.HttpGet(fullUrl, out exception, null);

            if (strRet == null)
            {
                TraceLog.Error("GoogleAuth.AuthToken, HttpGet return null query failed");
                return false;
            }

            TraceLog.Debug("GoogleAuth.AuthToken , http return strRet {0}", strRet);

            LitJson.JsonData jsonData = JsonMapper.ToObject(strRet);

            LitJson.JsonData aud = jsonData["aud"];
            if (aud == null)
            {
                TraceLog.Error("GoogleAuth.AuthToken, ret {0}, no aud", strRet);
                return false;
            }

            if(aud.ToString() != HttpProxyServerUtils.GetServerConfig().google_aud)
            {
                TraceLog.Error("GoogleAuth.AuthToken, aud invalid {0}", aud.ToString());
                return false;
            }

            LitJson.JsonData json_sub = jsonData["sub"];

            if (json_sub == null)
            {
                TraceLog.Error("GoogleAuth.AuthToken ,no valid json_sub");
                return false;
            }

            userid = json_sub.ToString();

            LitJson.JsonData json_name = jsonData["name"];
            LitJson.JsonData json_picture = jsonData["picture"];
            LitJson.JsonData json_email = jsonData["email"];

            if (json_name != null)
            {
                name = json_name.ToString();
            }

            if (json_picture != null)
            {
                icon = json_picture.ToString();
            }

            if(json_email != null)
            {
                email = json_email.ToString();
            }


            //成功,打印一下日志
            TraceLog.Debug("GoogleAuth.AuthToken ,ret {0}, accountid {1}", strRet, accountid);

            return true;
        }

    }
}