namespace Yw
{
    /// <summary>
    /// AccessToken
    /// </summary>
    public sealed partial class BIMFaceClient
    {
        private string _accessToken;//令牌
        private const string _accessTokenUrl = @"https://api.bimface.com/oauth2/token";//令牌请求地址
        private readonly AccessTokenExpireHelper _accessTokenExpireHelper = new(); //access token 过期辅助类


        /// <summary>
        /// 获取AccessToken
        /// </summary>
        public async Task<string> GetAccessToken()
        {
            if (string.IsNullOrEmpty(_accessToken) || _accessTokenExpireHelper.IsExpire())
            {
                await GetAccessTokenAsync();
            }
            return _accessToken;
        }

        //获取AccessToken，内部调用
        private async Task GetAccessTokenAsync()
        {
            var request = new FlurlRequest(_accessTokenUrl);
            var header = HeaderHelper.GetHeader(_appKey, _appSecret);
            request.WithHeader(header.Key, header.Value);
            var response = await request.PostAsync();
            var jsonString = await response.GetStringAsync();
            var result = JsonHelper.Json2Object<AccessTokenResponse>(jsonString);
            result.TryThrowException();
            _accessToken = result.Data.Token;
            _accessTokenExpireHelper.SetExpireTime(result.Data.ExpireTime);
        }













    }

}