using RSecurityBackend.DbContext;
using RSecurityBackend.Models.Audit.Db;
using RSecurityBackend.Models.Auth.Db;
using RSecurityBackend.Models.Generic;
using System;
using System.Linq;
using System.Threading.Tasks;

namespace RSecurityBackend.Services.Implementation
{
    /// <summary>
    /// Audit Log Service Implementation
    /// </summary>
    public class AuditLogServiceEF : IAuditLogService
    {
        /// <summary>
        /// get all  audit logs ordered by time
        /// </summary>
        /// <param name="paging"></param>
        /// <param name="userName">empty means unfiltered</param>
        /// <param name="orderByTimeDescending"></param>
        /// <returns></returns>
        public async Task<RServiceResult<(PaginationMetadata PagingMeta, REvent[] Items)>> GetAll(PagingParameterModel paging, string userName, bool orderByTimeDescending)
        {
            try
            {
                userName = userName == null ? "" : userName.Trim();
                var source =
                    orderByTimeDescending ?
                     _context.AuditLogs
                     .Where(l => string.IsNullOrEmpty(userName) || l.UserName == userName)
                    .OrderByDescending(l => l.StartDate)
                    .AsQueryable()
                    :
                    _context.AuditLogs
                     .Where(l => string.IsNullOrEmpty(userName) || l.UserName == userName)
                    .OrderBy(l => l.StartDate)
                    .AsQueryable();


                (PaginationMetadata PagingMeta, REvent[] Items) paginatedResult =
                    await QueryablePaginator<REvent>.Paginate(source, paging);



                return new RServiceResult<(PaginationMetadata PagingMeta, REvent[] Items)>(paginatedResult);
            }
            catch (Exception exp)
            {
                return new RServiceResult<(PaginationMetadata PagingMeta, REvent[] Items)>((PagingMeta: null, Items: null), exp.ToString());
            }
        }

        /// <summary>
        /// Database Contetxt
        /// </summary>
        protected readonly RSecurityDbContext<RAppUser, RAppRole, Guid> _context;

        /// <summary>
        /// constuctor
        /// </summary>
        /// <param name="context"></param>
        public AuditLogServiceEF(RSecurityDbContext<RAppUser, RAppRole, Guid> context)
        {
            _context = context;
        }
    }
}