using log4net;
using OT.COM.ArsenalDB;
using System;
using System.Collections.Concurrent;

namespace CounsellorBL.Helper
{
    public class APIURLHelper
    {
        private ILog Logger { get; } = LogManager.GetLogger(typeof(APIURLHelper));
        private string ApiVersion { get; set; }

        public APIURLHelper()
        {
            const string error_information = "API version initial failed";

            try
            {
                ConcurrentDictionary<string, string> dicSetting = CustomizeDBMgr.SettingData;
                ApiVersion = dicSetting.ContainsKey("FB_API_VERSION") ? dicSetting["FB_API_VERSION"] : "v7.0";

                if (string.IsNullOrWhiteSpace(ApiVersion)) throw new Exception(error_information);
            }
            catch(Exception ex)
            {
                Logger.Error($"{error_information}, Excepiton: {ex.ToString()}");
                throw ex;
            }
        }

        public string SendMessage(string access_token_) => $"https://graph.facebook.com/{ApiVersion}/me/messages?access_token={access_token_}";

        public string CheckAccessToken(string access_token_) => $"https://graph.facebook.com/{ApiVersion}/debug_token?input_token={access_token_}&access_token={access_token_}";

        public string GetUserAccessToken(string user_access_token_, string app_id_, string app_secret) => 
            $"https://graph.facebook.com/{ApiVersion}/oauth/access_token?grant_type=fb_exchange_token&client_id={app_id_}&client_secret={app_secret}&fb_exchange_token={user_access_token_}";

        public string GetPageAccessToken(string user_id_, string long_lived_user_access_token) => $"https://graph.facebook.com/{ApiVersion}/{user_id_}/accounts?access_token={long_lived_user_access_token}";

        public string GetGroupPublicDescription(string group_id_, string user_access_token_) => $"https://graph.facebook.com/{ApiVersion}/{group_id_}?access_token={user_access_token_}";
    }
}