// (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.
//
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// distributing the program. Pursuant to Section 7(e) we decline to grant you any rights under
// trademark law for use of our trademarks.
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// 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

namespace ASC.Data.Storage;

[Singletone(Additional = typeof(StorageConfigExtension))]
public class StorageFactoryConfig
{
    private readonly Configuration.Storage _section;
    private readonly ConfigurationExtension _configurationExtension;

    public StorageFactoryConfig(Configuration.Storage storage, ConfigurationExtension configurationExtension)
    {
        _section = storage;
        _configurationExtension = configurationExtension;
    }

    public IEnumerable<string> GetModuleList(string region = "current", bool exceptDisabledMigration = false)
    {
        return GetStorage(region).Module
                .Where(x => x.Visible && (!exceptDisabledMigration || !x.DisableMigrate))
            .Select(x => x.Name);
    }

    public IEnumerable<string> GetDomainList(string modulename, string region = "current")
    {
        var section = GetStorage(region);
        if (section == null)
        {
            throw new ArgumentException("config section not found");
        }

        return section.Module
            .Single(x => x.Name.Equals(modulename, StringComparison.OrdinalIgnoreCase))
            .Domain
            .Where(x => x.Visible)
            .Select(x => x.Name);
    }

    public Configuration.Storage GetStorage(string region)
    {
        return region == "current" ? _section : _configurationExtension.GetSetting<Configuration.Storage>($"regions:{region}:storage");
    }
}

public static class StorageFactoryExtenstion
{
    public static void InitializeHttpHandlers(this IEndpointRouteBuilder builder, string config = null)
    {
        //TODO:
        //if (!HostingEnvironment.IsHosted)
        //{
        //    throw new InvalidOperationException("Application not hosted.");
        //}

        var section = builder.ServiceProvider.GetService<Configuration.Storage>();
        var pathUtils = builder.ServiceProvider.GetService<PathUtils>();
        if (section != null)
        {
            if (section.Module != null)
            {
                foreach (var m in section.Module)
                {
                    //todo: add path criterion
                    if (m.Type == "disc" || !m.Public || m.Path.Contains(Constants.StorageRootParam))
                    {
                        builder.RegisterStorageHandler(
                            m.Name,
                            string.Empty,
                            m.Public);
                    }

                    //todo: add path criterion
                    if (m.Domain != null)
                    {
                        foreach (var d in m.Domain.Where(d => d.Path.Contains(Constants.StorageRootParam)))
                        {
                            builder.RegisterStorageHandler(
                                m.Name,
                                d.Name,
                                d.Public);
                        }
                    }
                }
            }
        }
    }
}

[Scope(Additional = typeof(StorageFactoryExtension))]
public class StorageFactory
{
    private const string DefaultTenantName = "default";

    private readonly StorageFactoryConfig _storageFactoryConfig;
    private readonly SettingsManager _settingsManager;
    private readonly StorageSettingsHelper _storageSettingsHelper;
    private readonly CoreBaseSettings _coreBaseSettings;
    private readonly IServiceProvider _serviceProvider;

    public StorageFactory(
        IServiceProvider serviceProvider,
        StorageFactoryConfig storageFactoryConfig,
        SettingsManager settingsManager,
        StorageSettingsHelper storageSettingsHelper,
        CoreBaseSettings coreBaseSettings)
    {
        _serviceProvider = serviceProvider;
        _storageFactoryConfig = storageFactoryConfig;
        _settingsManager = settingsManager;
        _storageSettingsHelper = storageSettingsHelper;
        _coreBaseSettings = coreBaseSettings;
    }

    public IDataStore GetStorage(int? tenant, string module, string region = "current")
    {
        var tenantQuotaController = _serviceProvider.GetService<TenantQuotaController>();
        tenantQuotaController.Init(tenant.GetValueOrDefault());

        return GetStorage(tenant, module, tenantQuotaController, region);
    }

    public IDataStore GetStorage(int? tenant, string module, IQuotaController controller, string region = "current")
    {
        var tenantPath = tenant != null ? TenantPath.CreatePath(tenant.Value) : TenantPath.CreatePath(DefaultTenantName);

        tenant = tenant ?? -2;

        var section = _storageFactoryConfig.GetStorage(region);
        if (section == null)
        {
            throw new InvalidOperationException("config section not found");
        }

        var settings = _settingsManager.Load<StorageSettings>(tenant.Value);
        //TODO:GetStoreAndCache
        return GetDataStore(tenantPath, module, _storageSettingsHelper.DataStoreConsumer(settings), controller, region);
    }

    public IDataStore GetStorageFromConsumer(int? tenant, string module, DataStoreConsumer consumer, string region = "current")
    {
        var tenantPath = tenant != null ? TenantPath.CreatePath(tenant.Value) : TenantPath.CreatePath(DefaultTenantName);

        var section = _storageFactoryConfig.GetStorage(region);
        if (section == null)
        {
            throw new InvalidOperationException("config section not found");
        }

        var tenantQuotaController = _serviceProvider.GetService<TenantQuotaController>();
        tenantQuotaController.Init(tenant.GetValueOrDefault());

        return GetDataStore(tenantPath, module, consumer, tenantQuotaController);
    }

    private IDataStore GetDataStore(string tenantPath, string module, DataStoreConsumer consumer, IQuotaController controller, string region = "current")
    {
        var storage = _storageFactoryConfig.GetStorage(region);
        var moduleElement = storage.GetModuleElement(module);
        if (moduleElement == null)
        {
            throw new ArgumentException("no such module", module);
        }

        var handler = storage.GetHandler(moduleElement.Type);
        Type instanceType;
        IDictionary<string, string> props;

        if (_coreBaseSettings.Standalone &&
            !moduleElement.DisableMigrate &&
            consumer.IsSet)
        {
            instanceType = consumer.HandlerType;
            props = consumer;
        }
        else
        {
            instanceType = Type.GetType(handler.Type, true);
            props = handler.Property.ToDictionary(r => r.Name, r => r.Value);
        }


        return ((IDataStore)ActivatorUtilities.CreateInstance(_serviceProvider, instanceType))
            .Configure(tenantPath, handler, moduleElement, props)
            .SetQuotaController(moduleElement.Count ? controller : null
            /*don't count quota if specified on module*/);
    }
}

public static class StorageFactoryExtension
{
    public static void Register(DIHelper services)
    {
        services.TryAdd<DiscDataStore>();
        services.TryAdd<GoogleCloudStorage>();
        services.TryAdd<RackspaceCloudStorage>();
        services.TryAdd<S3Storage>();
        services.TryAdd<TenantQuotaController>();
    }
}