roadie/Roadie.Api.Services/GenreService.cs

using Microsoft.Extensions.Logging;
using Roadie.Library.Caching;
using Roadie.Library.Configuration;
using Roadie.Library.Encoding;
using Roadie.Library.Models;
using Roadie.Library.Models.Pagination;
using Roadie.Library.Models.Users;
using Roadie.Library.Utility;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Linq.Dynamic.Core;
using System.Threading.Tasks;
using data = Roadie.Library.Data;

namespace Roadie.Api.Services
{
    public class GenreService : ServiceBase, IGenreService
    {
        public GenreService(IRoadieSettings configuration,
            IHttpEncoder httpEncoder,
            IHttpContext httpContext,
            data.IRoadieDbContext dbContext,
            ICacheManager cacheManager,
            ILogger<GenreService> logger)
            : base(configuration, httpEncoder, dbContext, cacheManager, logger, httpContext)
        {
        }

        public Task<Library.Models.Pagination.PagedResult<GenreList>> List(User roadieUser, PagedRequest request,
            bool? doRandomize = false)
        {
            var sw = new Stopwatch();
            sw.Start();

            if (!string.IsNullOrEmpty(request.Sort))
            {
                request.Sort = request.Sort.Replace("createdDate", "createdDateTime");
                request.Sort = request.Sort.Replace("lastUpdated", "lastUpdatedDateTime");
            }

            var result = from g in DbContext.Genres
                         let releaseCount = (from rg in DbContext.ReleaseGenres
                                             where rg.GenreId == g.Id
                                             select rg.Id).Count()
                         let artistCount = (from rg in DbContext.ArtistGenres
                                            where rg.GenreId == g.Id
                                            select rg.Id).Count()
                         where request.FilterValue.Length == 0 || g.Name.Contains(request.FilterValue)
                         select new GenreList
                         {
                             DatabaseId = g.Id,
                             Id = g.RoadieId,
                             Genre = new DataToken
                             {
                                 Text = g.Name,
                                 Value = g.RoadieId.ToString()
                             },
                             ReleaseCount = releaseCount,
                             ArtistCount = artistCount,
                             CreatedDate = g.CreatedDate,
                             LastUpdated = g.LastUpdated
                         };

            GenreList[] rows;
            var rowCount = result.Count();
            if (doRandomize ?? false)
            {
                var randomLimit = roadieUser?.RandomReleaseLimit ?? 100;
                request.Limit = request.LimitValue > randomLimit ? randomLimit : request.LimitValue;
                rows = result.OrderBy(x => x.RandomSortId).Skip(request.SkipValue).Take(request.LimitValue).ToArray();
            }
            else
            {
                var sortBy = string.IsNullOrEmpty(request.Sort)
                    ? request.OrderValue(new Dictionary<string, string> { { "Genre.Text", "ASC" } })
                    : request.OrderValue();
                rows = result.OrderBy(sortBy).Skip(request.SkipValue).Take(request.LimitValue).ToArray();
            }

            sw.Stop();
            return Task.FromResult(new Library.Models.Pagination.PagedResult<GenreList>
            {
                TotalCount = rowCount,
                CurrentPage = request.PageValue,
                TotalPages = (int)Math.Ceiling((double)rowCount / request.LimitValue),
                OperationTime = sw.ElapsedMilliseconds,
                Rows = rows
            });
        }
    }
}