// (c) Copyright Ascensio System SIA 2010-2022
//
// This program is a free software product.
// You can redistribute it and/or modify it under the terms
// of the GNU Affero General Public License (AGPL) version 3 as published by the Free Software
// Foundation. In accordance with Section 7(a) of the GNU AGPL its Section 15 shall be amended
// to the effect that Ascensio System SIA expressly excludes the warranty of non-infringement of
// any third-party rights.
//
// This program is distributed WITHOUT ANY WARRANTY, without even the implied warranty
// of MERCHANTABILITY or FITNESS FOR A PARTICULAR  PURPOSE. For details, see
// the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
//
// You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia, EU, LV-1021.
//
// The  interactive user interfaces in modified source and object code versions of the Program must
// display Appropriate Legal Notices, as required under Section 5 of the GNU AGPL version 3.
//
// Pursuant to Section 7(b) of the License you must retain the original Product logo when
// distributing the program. Pursuant to Section 7(e) we decline to grant you any rights under
// trademark law for use of our trademarks.
//
// All the Product's GUI elements, including illustrations and icon sets, as well as technical writing
// content are licensed under the terms of the Creative Commons Attribution-ShareAlike 4.0
// International. See the License terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode

using Constants = ASC.Core.Users.Constants;

namespace ASC.Web.Studio.Core.SMS;

[Scope]
public class SmsManager
{
    private readonly UserManager _userManager;
    private readonly SecurityContext _securityContext;
    private readonly TenantManager _tenantManager;
    private readonly SmsKeyStorage _smsKeyStorage;
    private readonly SmsSender _smsSender;
    private readonly StudioSmsNotificationSettingsHelper _studioSmsNotificationSettingsHelper;
    private readonly CookiesManager _cookieManager;

    public SmsManager(
        UserManager userManager,
        SecurityContext securityContext,
        TenantManager tenantManager,
        SmsKeyStorage smsKeyStorage,
        SmsSender smsSender,
        StudioSmsNotificationSettingsHelper studioSmsNotificationSettingsHelper,
        CookiesManager cookieManager)
    {
        _userManager = userManager;
        _securityContext = securityContext;
        _tenantManager = tenantManager;
        _smsKeyStorage = smsKeyStorage;
        _smsSender = smsSender;
        _studioSmsNotificationSettingsHelper = studioSmsNotificationSettingsHelper;
        _cookieManager = cookieManager;
    }

    public Task<string> SaveMobilePhoneAsync(UserInfo user, string mobilePhone)
    {
        mobilePhone = SmsSender.GetPhoneValueDigits(mobilePhone);

        if (user == null || Equals(user, Constants.LostUser))
        {
            throw new Exception(Resource.ErrorUserNotFound);
        }

        if (string.IsNullOrEmpty(mobilePhone))
        {
            throw new Exception(Resource.ActivateMobilePhoneEmptyPhoneNumber);
        }

        if (!string.IsNullOrEmpty(user.MobilePhone) && user.MobilePhoneActivationStatus == MobilePhoneActivationStatus.Activated)
        {
            throw new Exception(Resource.MobilePhoneMustErase);
        }

        return InternalSaveMobilePhoneAsync(user, mobilePhone);
    }

    private async Task<string> InternalSaveMobilePhoneAsync(UserInfo user, string mobilePhone)
    {
        user.MobilePhone = mobilePhone;
        user.MobilePhoneActivationStatus = MobilePhoneActivationStatus.NotActivated;
        if (_securityContext.IsAuthenticated)
        {
            _userManager.SaveUserInfo(user, syncCardDav: true);
        }
        else
        {
            try
            {
                _securityContext.AuthenticateMeWithoutCookie(ASC.Core.Configuration.Constants.CoreSystem);
                _userManager.SaveUserInfo(user, syncCardDav: true);
            }
            finally
            {
                _securityContext.Logout();
            }
        }

        if (_studioSmsNotificationSettingsHelper.Enable)
        {
            await PutAuthCodeAsync(user, false);
        }

        return mobilePhone;
    }

    public Task PutAuthCodeAsync(UserInfo user, bool again)
    {
        if (user == null || Equals(user, Constants.LostUser))
        {
            throw new Exception(Resource.ErrorUserNotFound);
        }

        if (!_studioSmsNotificationSettingsHelper.IsVisibleAndAvailableSettings() || !_studioSmsNotificationSettingsHelper.Enable)
        {
            throw new MethodAccessException();
        }

        var mobilePhone = SmsSender.GetPhoneValueDigits(user.MobilePhone);

        if (_smsKeyStorage.ExistsKey(mobilePhone) && !again)
        {
            return Task.CompletedTask;
        }

        if (!_smsKeyStorage.GenerateKey(mobilePhone, out var key))
        {
            throw new Exception(Resource.SmsTooMuchError);
        }

        return InternalPutAuthCodeAsync(mobilePhone, key);
    }

    private async Task InternalPutAuthCodeAsync(string mobilePhone, string key)
    {
        if (await _smsSender.SendSMSAsync(mobilePhone, string.Format(Resource.SmsAuthenticationMessageToUser, key)))
        {
            _tenantManager.SetTenantQuotaRow(new TenantQuotaRow { Tenant = _tenantManager.GetCurrentTenant().Id, Path = "/sms", Counter = 1 }, true);
        }
    }

    public void ValidateSmsCode(UserInfo user, string code, bool isEntryPoint = false)
    {
        if (!_studioSmsNotificationSettingsHelper.IsVisibleAndAvailableSettings()
            || !_studioSmsNotificationSettingsHelper.Enable)
        {
            return;
        }

        if (user == null || Equals(user, Constants.LostUser))
        {
            throw new Exception(Resource.ErrorUserNotFound);
        }

        var valid = _smsKeyStorage.ValidateKey(user.MobilePhone, code);
        switch (valid)
        {
            case SmsKeyStorage.Result.Empty:
                throw new Exception(Resource.ActivateMobilePhoneEmptyCode);
            case SmsKeyStorage.Result.TooMuch:
                throw new BruteForceCredentialException(Resource.SmsTooMuchError);
            case SmsKeyStorage.Result.Timeout:
                throw new TimeoutException(Resource.SmsAuthenticationTimeout);
            case SmsKeyStorage.Result.Invalide:
                throw new ArgumentException(Resource.SmsAuthenticationMessageError);
        }
        if (valid != SmsKeyStorage.Result.Ok)
        {
            throw new Exception("Error: " + valid);
        }

        if (!_securityContext.IsAuthenticated)
        {
            var action = isEntryPoint ? MessageAction.LoginSuccessViaApiSms : MessageAction.LoginSuccessViaSms;
            _cookieManager.AuthenticateMeAndSetCookies(user.Tenant, user.Id, action);
        }

        if (user.MobilePhoneActivationStatus == MobilePhoneActivationStatus.NotActivated)
        {
            user.MobilePhoneActivationStatus = MobilePhoneActivationStatus.Activated;
            _userManager.SaveUserInfo(user);
        }
    }
}