/*
 *
 * (c) Copyright Ascensio System Limited 2010-2018
 *
 * This program is freeware. You can redistribute it and/or modify it under the terms of the GNU 
 * General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html). 
 * In accordance with Section 7(a) of the GNU GPL 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 more details, see GNU GPL at https://www.gnu.org/copyleft/gpl.html
 *
 * You can contact Ascensio System SIA by email at sales@onlyoffice.com
 *
 * The interactive user interfaces in modified source and object code versions of ONLYOFFICE must display 
 * Appropriate Legal Notices, as required under Section 5 of the GNU GPL version 3.
 *
 * Pursuant to Section 7 § 3(b) of the GNU GPL you must retain the original ONLYOFFICE logo which contains 
 * relevant author attributions when distributing the software. If the display of the logo in its graphic 
 * form is not reasonably feasible for technical reasons, you must include the words "Powered by ONLYOFFICE" 
 * in every copy of the program you distribute. 
 * Pursuant to Section 7 § 3(e) we decline to grant you any rights under trademark law for use of our trademarks.
 *
*/

namespace ASC.Notify;

[Singletone(Additional = typeof(NotifyServiceExtension))]
public class NotifyService : INotifyService, IDisposable
{
    private readonly ILog _logger;
    private readonly ICacheNotify<NotifyMessage> _cacheNotify;
    private readonly ICacheNotify<NotifyInvoke> _cacheInvoke;
    private readonly DbWorker _db;
    private readonly IServiceScopeFactory _serviceScopeFactory;

    public NotifyService(DbWorker db, IServiceScopeFactory serviceScopeFactory, ICacheNotify<NotifyMessage> cacheNotify, ICacheNotify<NotifyInvoke> cacheInvoke, IOptionsMonitor<ILog> options)
    {
        _db = db;
        _serviceScopeFactory = serviceScopeFactory;
        _cacheNotify = cacheNotify;
        _cacheInvoke = cacheInvoke;
        _logger = options.CurrentValue;
    }

    public void Start()
    {
        _cacheNotify.Subscribe((n) => SendNotifyMessage(n), CacheNotifyAction.InsertOrUpdate);
        _cacheInvoke.Subscribe((n) => InvokeSendMethod(n), CacheNotifyAction.InsertOrUpdate);
    }

    public void Stop()
    {
        _cacheNotify.Unsubscribe(CacheNotifyAction.InsertOrUpdate);
    }

    public void SendNotifyMessage(NotifyMessage notifyMessage)
    {
        try
        {
            _db.SaveMessage(notifyMessage);
        }
        catch (Exception e)
        {
            _logger.Error(e);
        }
    }

    public void InvokeSendMethod(NotifyInvoke notifyInvoke)
    {
        var service = notifyInvoke.Service;
        var method = notifyInvoke.Method;
        var tenant = notifyInvoke.Tenant;
        var parameters = notifyInvoke.Parameters;

        var serviceType = Type.GetType(service, true);

        using var scope = _serviceScopeFactory.CreateScope();

        var instance = scope.ServiceProvider.GetService(serviceType);
        if (instance == null)
        {
            throw new Exception("Service instance not found.");
        }

        var methodInfo = serviceType.GetMethod(method);
        if (methodInfo == null)
        {
            throw new Exception("Method not found.");
        }

        var scopeClass = scope.ServiceProvider.GetService<NotifyServiceScope>();
        var (tenantManager, tenantWhiteLabelSettingsHelper, settingsManager) = scopeClass;
        tenantManager.SetCurrentTenant(tenant);
        tenantWhiteLabelSettingsHelper.Apply(settingsManager.Load<TenantWhiteLabelSettings>(), tenant);
        methodInfo.Invoke(instance, parameters.ToArray());
    }

    public void Dispose()
    {
        _cacheNotify.Unsubscribe(CacheNotifyAction.InsertOrUpdate);
        _cacheInvoke.Unsubscribe(CacheNotifyAction.InsertOrUpdate);
    }
}

[Scope]
public class NotifyServiceScope
{
    private readonly TenantManager _tenantManager;
    private readonly TenantWhiteLabelSettingsHelper _tenantWhiteLabelSettingsHelper;
    private readonly SettingsManager _settingsManager;

    public NotifyServiceScope(TenantManager tenantManager, TenantWhiteLabelSettingsHelper tenantWhiteLabelSettingsHelper, SettingsManager settingsManager)
    {
        _tenantManager = tenantManager;
        _tenantWhiteLabelSettingsHelper = tenantWhiteLabelSettingsHelper;
        _settingsManager = settingsManager;
    }

    public void Deconstruct(out TenantManager tenantManager, out TenantWhiteLabelSettingsHelper tenantWhiteLabelSettingsHelper, out SettingsManager settingsManager)
    {
        tenantManager = _tenantManager;
        tenantWhiteLabelSettingsHelper = _tenantWhiteLabelSettingsHelper;
        settingsManager = _settingsManager;
    }
}

public static class NotifyServiceExtension
{
    public static void Register(DIHelper services)
    {
        services.TryAdd<NotifyServiceScope>();
    }
}