using Serilog;
using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using Xamarin.Essentials;

namespace TINK.Model.User.Account
{
    public class Store : IStore
    {
        /// <summary> Holds id of the debug level key. </summary>
        private const string KEY_DEBUGLEVEL = "DebugLevel";

        /// <summary> Holds the id of the session. </summary>
        private const string KEY_SESSIONCOOKIE = "SessionCookie";

        /// <summary> Holds id of the mail address key. </summary>
        private const string KEY_MAILADDRESS = "MailAddress";

        /// <summary> Holds key for flag is agb acknowledged. </summary>
        private const string KEY_ISAGBACKNOWLEDGED = "IsAgbAcknowledged";

        public IAccount Delete(IAccount account)
        {
            SecureStorage.RemoveAll();
            return new EmptyAccount();
        }

        public async Task<IAccount> Load()
        {

            var mail = string.Empty;
            var isAgbAcknowledged = Account.DEFAULTISAGBACKNOWLEDGED;
            var sessionCookie = string.Empty;
            var debugLevel = Permissions.None;

            try
            {
                mail = await SecureStorage.GetAsync(KEY_MAILADDRESS);
                bool.TryParse(await SecureStorage.GetAsync(KEY_ISAGBACKNOWLEDGED), out isAgbAcknowledged);
                sessionCookie = await SecureStorage.GetAsync(KEY_SESSIONCOOKIE);
                Enum.TryParse(await SecureStorage.GetAsync(KEY_DEBUGLEVEL), out debugLevel);
            }
            catch (Exception exception)
            {
                Log.ForContext<Store>().Error("Loading account from store failed. {Exception}", exception);
            }

            return new Account(
                mail,
                string.Empty,
                isAgbAcknowledged,
                sessionCookie,
                new List<string>(),
                debugLevel);
        }

        public async Task Save(IAccount mailAndPwd)
        {
            try
            {
                await SecureStorage.SetAsync(KEY_MAILADDRESS, mailAndPwd.Mail);
                await SecureStorage.SetAsync(KEY_ISAGBACKNOWLEDGED, mailAndPwd.IsAgbAcknowledged.ToString());
                await SecureStorage.SetAsync(KEY_SESSIONCOOKIE, mailAndPwd.SessionCookie);
                await SecureStorage.SetAsync(KEY_DEBUGLEVEL, mailAndPwd.DebugLevel.ToString());
            }
            catch (Exception exception)
            {
                Log.ForContext<Store>().Error("Saving account from store failed. {Exception}", exception);
            }
        }
    }
}