using Microsoft.EntityFrameworkCore;
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.Statistics;
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 UserService : ServiceBase, IUserService
    {
        public UserService(IRoadieSettings configuration,
                             IHttpEncoder httpEncoder,
                             IHttpContext httpContext,
                             data.IRoadieDbContext context,
                             ICacheManager cacheManager,
                             ILogger<ArtistService> logger,
                             ICollectionService collectionService,
                             IPlaylistService playlistService)
            : base(configuration, httpEncoder, context, cacheManager, logger, httpContext)
        {
        }

        public async Task<Library.Models.Pagination.PagedResult<UserList>> List(PagedRequest request)
        {
            var sw = new Stopwatch();
            sw.Start();

            if (!string.IsNullOrEmpty(request.Sort))
            {
                request.Sort = request.Sort.Replace("createdDate", "createdDateTime");
                request.Sort = request.Sort.Replace("lastLogin", "lastUpdatedDateTime");
                request.Sort = request.Sort.Replace("lastApiAccess", "lastApiAccessDateTime");
                request.Sort = request.Sort.Replace("registeredOn", "registeredDateTime");
            }

            var result = (from u in this.DbContext.Users
                          where (request.FilterValue.Length == 0 || (request.FilterValue.Length > 0 && (u.Username.Contains(request.FilterValue))))
                          select new UserList
                          {
                              DatabaseId = u.Id,
                              Id = u.RoadieId,
                              User = new DataToken
                              {
                                  Text = u.UserName,
                                  Value = u.RoadieId.ToString()
                              },
                              IsEditor = u.UserRoles.Any(x => x.Role.Name == "Editor"),
                              IsPrivate = u.IsPrivate,
                              Thumbnail = this.MakeUserThumbnailImage(u.RoadieId),
                              CreatedDate = u.CreatedDate,
                              LastUpdated = u.LastUpdated,
                              RegisteredDate = u.RegisteredOn,
                              LastLoginDate = u.LastLogin,
                              LastApiAccessDate = u.LastApiAccess
                          });

            UserList[] rows = null;
            var rowCount = result.Count();
            var sortBy = string.IsNullOrEmpty(request.Sort) ? request.OrderValue(new Dictionary<string, string> { { "User.Text", "ASC" } }) : request.OrderValue(null);
            rows = result.OrderBy(sortBy).Skip(request.SkipValue).Take(request.LimitValue).ToArray();

            if (rows.Any())
            {
                foreach (var row in rows)
                {
                    var userArtists = this.DbContext.UserArtists.Include(x => x.Artist).Where(x => x.UserId == row.DatabaseId).ToArray();
                    var userReleases = this.DbContext.UserReleases.Include(x => x.Release).Where(x => x.UserId == row.DatabaseId).ToArray();
                    var userTracks = this.DbContext.UserTracks.Include(x => x.Track).Where(x => x.UserId == row.DatabaseId).ToArray();

                    var mostPlayedArtist = (from a in this.DbContext.Artists
                                            join r in this.DbContext.Releases on a.Id equals r.ArtistId
                                            join rm in this.DbContext.ReleaseMedias on r.Id equals rm.ReleaseId
                                            join t in this.DbContext.Tracks on rm.Id equals t.ReleaseMediaId
                                            join ut in this.DbContext.UserTracks on t.Id equals ut.TrackId
                                            where ut.UserId == row.DatabaseId
                                            select new { a, ut.PlayedCount })
                                             .GroupBy(a => a.a)
                                             .Select(x => new DataToken
                                             {
                                                 Text = x.Key.Name,
                                                 Value = x.Key.RoadieId.ToString(),
                                                 Data = x.Sum(t => t.PlayedCount)
                                             })
                                             .OrderByDescending(x => x.Data)
                                             .FirstOrDefault();

                    var mostPlayedRelease = (from r in this.DbContext.Releases
                                             join rm in this.DbContext.ReleaseMedias on r.Id equals rm.ReleaseId
                                             join t in this.DbContext.Tracks on rm.Id equals t.ReleaseMediaId
                                             join ut in this.DbContext.UserTracks on t.Id equals ut.TrackId
                                             where ut.UserId == row.DatabaseId
                                             select new { r, ut.PlayedCount })
                                             .GroupBy(r => r.r)
                                             .Select(x => new DataToken
                                             {
                                                 Text = x.Key.Title,
                                                 Value = x.Key.RoadieId.ToString(),
                                                 Data = x.Sum(t => t.PlayedCount)
                                             })
                                             .OrderByDescending(x => x.Data)
                                             .FirstOrDefault();

                    var mostPlayedTrack = userTracks
                                          .OrderByDescending(x => x.PlayedCount)
                                          .Select(x => new DataToken
                                          {
                                              Text = x.Track.Title,
                                              Value = x.Track.RoadieId.ToString(),
                                              Data = x.PlayedCount
                                          })
                                          .FirstOrDefault();

                    row.Statistics = new UserStatistics
                    {
                        MostPlayedArtist = mostPlayedArtist,
                        MostPlayedRelease = mostPlayedRelease,
                        MostPlayedTrack = mostPlayedTrack,
                        RatedArtists = userArtists.Where(x => x.Rating > 0).Count(),
                        FavoritedArtists = userArtists.Where(x => x.IsFavorite ?? false).Count(),
                        DislikedArtists = userArtists.Where(x => x.IsDisliked ?? false).Count(),
                        RatedReleases = userReleases.Where(x => x.Rating > 0).Count(),
                        FavoritedReleases = userReleases.Where(x => x.IsFavorite ?? false).Count(),
                        DislikedReleases = userReleases.Where(x => x.IsDisliked ?? false).Count(),
                        RatedTracks = userTracks.Where(x => x.Rating > 0).Count(),
                        PlayedTracks = userTracks.Where(x => x.PlayedCount.HasValue).Select(x => x.PlayedCount).Sum(),
                        FavoritedTracks = userTracks.Where(x => x.IsFavorite ?? false).Count(),
                        DislikedTracks = userTracks.Where(x => x.IsDisliked ?? false).Count()
                    };
                }
            }
            sw.Stop();
            return new Library.Models.Pagination.PagedResult<UserList>
            {
                TotalCount = rowCount,
                CurrentPage = request.PageValue,
                TotalPages = (int)Math.Ceiling((double)rowCount / request.LimitValue),
                OperationTime = sw.ElapsedMilliseconds,
                Rows = rows
            };
        }
    }
}