/*
 *
 * (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.
 *
*/


using System;
using System.Collections.Generic;

using ASC.Common;
using ASC.Common.Threading.Progress;
using ASC.Core.Users;

using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Options;
using Microsoft.Extensions.Primitives;

namespace ASC.Data.Reassigns
{
    public class QueueWorker
    {
        public static IDictionary<string, StringValues> GetHttpHeaders(HttpRequest httpRequest)
        {
            return httpRequest?.Headers;
        }
    }
    public class QueueWorker<T> where T : class, IProgressItem
    {
        protected readonly ProgressQueue<T> Queue;

        public IHttpContextAccessor HttpContextAccessor { get; }
        public IServiceProvider ServiceProvider { get; }

        public QueueWorker(
            IHttpContextAccessor httpContextAccessor,
            IServiceProvider serviceProvider,
            ProgressQueueOptionsManager<T> optionsQueue)
        {
            HttpContextAccessor = httpContextAccessor;
            ServiceProvider = serviceProvider;
            Queue = optionsQueue.Value;
        }

        public string GetProgressItemId(int tenantId, Guid userId)
        {
            return string.Format("{0}_{1}_{2}", tenantId, userId, typeof(T).Name);
        }

        public T GetProgressItemStatus(int tenantId, Guid userId)
        {
            var id = GetProgressItemId(tenantId, userId);
            return Queue.GetStatus(id) as T;
        }

        public void Terminate(int tenantId, Guid userId)
        {
            var item = GetProgressItemStatus(tenantId, userId);

            if (item != null)
                Queue.Remove(item);
        }

        protected IProgressItem Start(int tenantId, Guid userId, Func<T> constructor)
        {
            lock (Queue.SynchRoot)
            {
                var task = GetProgressItemStatus(tenantId, userId);

                if (task != null && task.IsCompleted)
                {
                    Queue.Remove(task);
                    task = null;
                }

                if (task == null)
                {
                    task = constructor();
                    Queue.Add(task);
                }

                if (!Queue.IsStarted)
                    Queue.Start(x => x.RunJob());

                return task;
            }
        }
    }

    public class QueueWorkerReassign : QueueWorker<ReassignProgressItem>
    {
        public QueueWorkerRemove QueueWorkerRemove { get; }
        public QueueWorkerReassign(
            IHttpContextAccessor httpContextAccessor,
            IServiceProvider serviceProvider,
            QueueWorkerRemove queueWorkerRemove,
            ProgressQueueOptionsManager<ReassignProgressItem> optionsQueue) :
            base(httpContextAccessor, serviceProvider, optionsQueue)
        {
            QueueWorkerRemove = queueWorkerRemove;
        }

        public ReassignProgressItem Start(int tenantId, Guid fromUserId, Guid toUserId, Guid currentUserId, bool deleteProfile)
        {
            return Start(tenantId, fromUserId, () => new ReassignProgressItem(ServiceProvider, HttpContextAccessor.HttpContext, this, QueueWorkerRemove, tenantId, fromUserId, toUserId, currentUserId, deleteProfile)) as ReassignProgressItem;
        }
    }
    public class QueueWorkerRemove : QueueWorker<RemoveProgressItem>
    {
        public QueueWorkerRemove(
            IHttpContextAccessor httpContextAccessor,
            IServiceProvider serviceProvider,
            ProgressQueueOptionsManager<RemoveProgressItem> optionsQueue) :
            base(httpContextAccessor, serviceProvider, optionsQueue)
        {
        }

        public RemoveProgressItem Start(int tenantId, UserInfo user, Guid currentUserId, bool notify)
        {
            return Start(tenantId, user.ID, () => new RemoveProgressItem(ServiceProvider, HttpContextAccessor.HttpContext, this, tenantId, user, currentUserId, notify)) as RemoveProgressItem;
        }
    }

    public static class QueueExtension
    {
        public static DIHelper AddQueueWorkerRemoveService(this DIHelper services)
        {
            services.TryAddSingleton<ProgressQueueOptionsManager<RemoveProgressItem>>();
            services.TryAddSingleton<ProgressQueue<RemoveProgressItem>>();
            services.AddSingleton<IPostConfigureOptions<ProgressQueue<RemoveProgressItem>>, ConfigureProgressQueue<RemoveProgressItem>>();
            services.TryAddScoped<QueueWorkerRemove>();

            return services;
        }
        public static DIHelper AddQueueWorkerReassignService(this DIHelper services)
        {
            services.TryAddSingleton<ProgressQueueOptionsManager<ReassignProgressItem>>();
            services.TryAddSingleton<ProgressQueue<ReassignProgressItem>>();
            services.AddSingleton<IPostConfigureOptions<ProgressQueue<ReassignProgressItem>>, ConfigureProgressQueue<ReassignProgressItem>>();
            services.TryAddScoped<QueueWorkerReassign>();

            return services
                .AddQueueWorkerRemoveService();
        }
    }
}