/*
 *
 * (c) Copyright Ascensio System Limited 2010-2020
 *
 * 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 System.Linq;

using ASC.AuditTrail.Mappers;
using ASC.Common;
using ASC.Common.Logging;
using ASC.Core.Common.EF;
using ASC.Core.Common.EF.Context;
using ASC.Core.Common.EF.Model;
using ASC.Core.Users;

using Microsoft.Extensions.Options;

using Newtonsoft.Json;

namespace ASC.AuditTrail.Data
{
    public class LoginEventsRepository
    {
        private UserFormatter UserFormatter { get; }
        private AuditTrailContext AuditTrailContext { get; }
        private AuditActionMapper AuditActionMapper { get; }

        public LoginEventsRepository(UserFormatter userFormatter, DbContextManager<AuditTrailContext> dbContextManager, AuditActionMapper auditActionMapper)
        {
            UserFormatter = userFormatter;
            AuditTrailContext = dbContextManager.Value;
            AuditActionMapper = auditActionMapper;
        }

        private class Query
        {
            public LoginEvents LoginEvents { get; set; }
            public User User { get; set; }
        }

        public IEnumerable<LoginEvent> GetLast(int tenant, int chunk)
        {
            var query =
                (from b in AuditTrailContext.LoginEvents
                 from p in AuditTrailContext.User.Where(p => b.UserId == p.Id).DefaultIfEmpty()
                 where b.TenantId == tenant
                 orderby b.Date descending
                 select new Query { LoginEvents = b, User = p })
                .Take(chunk);

            return query.AsEnumerable().Select(ToLoginEvent).ToList();
        }

        public IEnumerable<LoginEvent> Get(int tenant, DateTime fromDate, DateTime to)
        {
            var query =
                from q in AuditTrailContext.LoginEvents
                from p in AuditTrailContext.User.Where(p => q.UserId == p.Id).DefaultIfEmpty()
                where q.TenantId == tenant
                where q.Date >= fromDate
                where q.Date <= to
                orderby q.Date descending
                select new Query { LoginEvents = q, User = p };

            return query.AsEnumerable().Select(ToLoginEvent).ToList();
        }

        public int GetCount(int tenant, DateTime? from = null, DateTime? to = null)
        {
            var query = AuditTrailContext.LoginEvents
                .Where(l => l.TenantId == tenant);

            if (from.HasValue && to.HasValue)
            {
                query = query.Where(l => l.Date >= from & l.Date <= to);
            }

            return query.Count();
        }

        private LoginEvent ToLoginEvent(Query query)
        {
            var evt = new LoginEvent
            {
                Id = query.LoginEvents.Id,
                IP = query.LoginEvents.Ip,
                Login = query.LoginEvents.Login,
                Browser = query.LoginEvents.Browser,
                Platform = query.LoginEvents.Platform,
                Date = query.LoginEvents.Date,
                TenantId = query.LoginEvents.TenantId,
                UserId = query.LoginEvents.UserId,
                Page = query.LoginEvents.Page,
                Action = query.LoginEvents.Action
            };

            if (query.LoginEvents.Description != null)
            {
                evt.Description = JsonConvert.DeserializeObject<IList<string>>(
                    query.LoginEvents.Description,
                    new JsonSerializerSettings
                    {
                        DateTimeZoneHandling = DateTimeZoneHandling.Utc
                    });
            }
            evt.UserName = (!string.IsNullOrEmpty(query.User?.FirstName) && !string.IsNullOrEmpty(query.User?.LastName))
                                ? UserFormatter.GetUserName(query.User.FirstName, query.User.LastName)
                                : !string.IsNullOrWhiteSpace(evt.Login)
                                        ? evt.Login
                                        : evt.UserId == Core.Configuration.Constants.Guest.ID
                                            ? AuditReportResource.GuestAccount
                                            : AuditReportResource.UnknownAccount;

            evt.ActionText = AuditActionMapper.GetActionText(evt);
            return evt;
        }
    }

    public static class LoginEventsRepositoryExtension
    {
        public static DIHelper AddLoginEventsRepositoryService(this DIHelper services)
        {
            if (services.TryAddScoped<LoginEventsRepository>())
            {
                return services
                    .AddUserFormatter()
                    .AddAuditTrailContextService()
                    .AddAuditActionMapperService();
            }

            return services;
        }
    }
}