using System.Collections.Immutable;
using System.Linq;
using System.Net;
using System.Text.Json;
using System.Threading;
using System.Threading.Tasks;
using Content.Server.Administration.Logs;
using Content.Server.Administration.Managers;
using Content.Shared.Administration.Logs;
using Content.Shared.Database;
using Content.Shared.Humanoid;
using Content.Shared.Humanoid.Markings;
using Content.Shared.Preferences;
using Microsoft.EntityFrameworkCore;
using Robust.Shared.Enums;
using Robust.Shared.Network;
using Robust.Shared.Utility;

namespace Content.Server.Database
{
    public abstract class ServerDbBase
    {
        #region Preferences
        public async Task<PlayerPreferences?> GetPlayerPreferencesAsync(NetUserId userId)
        {
            await using var db = await GetDb();

            var prefs = await db.DbContext
                .Preference
                .Include(p => p.Profiles).ThenInclude(h => h.Jobs)
                .Include(p => p.Profiles).ThenInclude(h => h.Antags)
                .Include(p => p.Profiles).ThenInclude(h => h.Traits)
                .AsSingleQuery()
                .SingleOrDefaultAsync(p => p.UserId == userId.UserId);

            if (prefs is null)
                return null;

            var maxSlot = prefs.Profiles.Max(p => p.Slot) + 1;
            var profiles = new Dictionary<int, ICharacterProfile>(maxSlot);
            foreach (var profile in prefs.Profiles)
            {
                profiles[profile.Slot] = ConvertProfiles(profile);
            }

            return new PlayerPreferences(profiles, prefs.SelectedCharacterSlot, Color.FromHex(prefs.AdminOOCColor));
        }

        public async Task SaveSelectedCharacterIndexAsync(NetUserId userId, int index)
        {
            await using var db = await GetDb();

            await SetSelectedCharacterSlotAsync(userId, index, db.DbContext);

            await db.DbContext.SaveChangesAsync();
        }

        public async Task SaveCharacterSlotAsync(NetUserId userId, ICharacterProfile? profile, int slot)
        {
            await using var db = await GetDb();

            if (profile is null)
            {
                await DeleteCharacterSlot(db.DbContext, userId, slot);
                await db.DbContext.SaveChangesAsync();
                return;
            }

            if (profile is not HumanoidCharacterProfile humanoid)
            {
                // TODO: Handle other ICharacterProfile implementations properly
                throw new NotImplementedException();
            }

            var oldProfile = db.DbContext.Profile
                .Include(p => p.Preference)
                .Where(p => p.Preference.UserId == userId.UserId)
                .Include(p => p.Jobs)
                .Include(p => p.Antags)
                .Include(p => p.Traits)
                .AsSplitQuery()
                .SingleOrDefault(h => h.Slot == slot);

            var newProfile = ConvertProfiles(humanoid, slot, oldProfile);
            if (oldProfile == null)
            {
                var prefs = await db.DbContext
                    .Preference
                    .Include(p => p.Profiles)
                    .SingleAsync(p => p.UserId == userId.UserId);

                prefs.Profiles.Add(newProfile);
            }

            await db.DbContext.SaveChangesAsync();
        }

        private static async Task DeleteCharacterSlot(ServerDbContext db, NetUserId userId, int slot)
        {
            var profile = await db.Profile.Include(p => p.Preference)
                .Where(p => p.Preference.UserId == userId.UserId && p.Slot == slot)
                .SingleOrDefaultAsync();

            if (profile == null)
            {
                return;
            }

            db.Profile.Remove(profile);
        }

        public async Task<PlayerPreferences> InitPrefsAsync(NetUserId userId, ICharacterProfile defaultProfile)
        {
            await using var db = await GetDb();

            var profile = ConvertProfiles((HumanoidCharacterProfile) defaultProfile, 0);
            var prefs = new Preference
            {
                UserId = userId.UserId,
                SelectedCharacterSlot = 0,
                AdminOOCColor = Color.Red.ToHex()
            };

            prefs.Profiles.Add(profile);

            db.DbContext.Preference.Add(prefs);

            await db.DbContext.SaveChangesAsync();

            return new PlayerPreferences(new[] {new KeyValuePair<int, ICharacterProfile>(0, defaultProfile)}, 0, Color.FromHex(prefs.AdminOOCColor));
        }

        public async Task DeleteSlotAndSetSelectedIndex(NetUserId userId, int deleteSlot, int newSlot)
        {
            await using var db = await GetDb();

            await DeleteCharacterSlot(db.DbContext, userId, deleteSlot);
            await SetSelectedCharacterSlotAsync(userId, newSlot, db.DbContext);

            await db.DbContext.SaveChangesAsync();
        }

        public async Task SaveAdminOOCColorAsync(NetUserId userId, Color color)
        {
            await using var db = await GetDb();
            var prefs = await db.DbContext
                .Preference
                .Include(p => p.Profiles)
                .SingleAsync(p => p.UserId == userId.UserId);
            prefs.AdminOOCColor = color.ToHex();

            await db.DbContext.SaveChangesAsync();

        }

        private static async Task SetSelectedCharacterSlotAsync(NetUserId userId, int newSlot, ServerDbContext db)
        {
            var prefs = await db.Preference.SingleAsync(p => p.UserId == userId.UserId);
            prefs.SelectedCharacterSlot = newSlot;
        }

        private static HumanoidCharacterProfile ConvertProfiles(Profile profile)
        {
            var jobs = profile.Jobs.ToDictionary(j => j.JobName, j => (JobPriority) j.Priority);
            var antags = profile.Antags.Select(a => a.AntagName);
            var traits = profile.Traits.Select(t => t.TraitName);

            var sex = Sex.Male;
            if (Enum.TryParse<Sex>(profile.Sex, true, out var sexVal))
                sex = sexVal;

            var clothing = ClothingPreference.Jumpsuit;
            if (Enum.TryParse<ClothingPreference>(profile.Clothing, true, out var clothingVal))
                clothing = clothingVal;

            var backpack = BackpackPreference.Backpack;
            if (Enum.TryParse<BackpackPreference>(profile.Backpack, true, out var backpackVal))
                backpack = backpackVal;

            var gender = sex == Sex.Male ? Gender.Male : Gender.Female;
            if (Enum.TryParse<Gender>(profile.Gender, true, out var genderVal))
                gender = genderVal;

            // ReSharper disable once ConditionalAccessQualifierIsNonNullableAccordingToAPIContract
            var markingsRaw = profile.Markings?.Deserialize<List<string>>();

            List<Marking> markings = new();
            if (markingsRaw != null)
            {
                foreach (var marking in markingsRaw)
                {
                    var parsed = Marking.ParseFromDbString(marking);

                    if (parsed is null) continue;

                    markings.Add(parsed);
                }
            }

            return new HumanoidCharacterProfile(
                profile.CharacterName,
                profile.FlavorText,
                profile.Species,
                profile.Age,
                sex,
                gender,
                new HumanoidCharacterAppearance
                (
                    profile.HairName,
                    Color.FromHex(profile.HairColor),
                    profile.FacialHairName,
                    Color.FromHex(profile.FacialHairColor),
                    Color.FromHex(profile.EyeColor),
                    Color.FromHex(profile.SkinColor),
                    markings
                ),
                clothing,
                backpack,
                jobs,
                (PreferenceUnavailableMode) profile.PreferenceUnavailable,
                antags.ToList(),
                traits.ToList()
            );
        }

        private static Profile ConvertProfiles(HumanoidCharacterProfile humanoid, int slot, Profile? profile = null)
        {
            profile ??= new Profile();
            var appearance = (HumanoidCharacterAppearance) humanoid.CharacterAppearance;
            List<string> markingStrings = new();
            foreach (var marking in appearance.Markings)
            {
                markingStrings.Add(marking.ToString());
            }
            var markings = JsonSerializer.SerializeToDocument(markingStrings);

            profile.CharacterName = humanoid.Name;
            profile.FlavorText = humanoid.FlavorText;
            profile.Species = humanoid.Species;
            profile.Age = humanoid.Age;
            profile.Sex = humanoid.Sex.ToString();
            profile.Gender = humanoid.Gender.ToString();
            profile.HairName = appearance.HairStyleId;
            profile.HairColor = appearance.HairColor.ToHex();
            profile.FacialHairName = appearance.FacialHairStyleId;
            profile.FacialHairColor = appearance.FacialHairColor.ToHex();
            profile.EyeColor = appearance.EyeColor.ToHex();
            profile.SkinColor = appearance.SkinColor.ToHex();
            profile.Clothing = humanoid.Clothing.ToString();
            profile.Backpack = humanoid.Backpack.ToString();
            profile.Markings = markings;
            profile.Slot = slot;
            profile.PreferenceUnavailable = (DbPreferenceUnavailableMode) humanoid.PreferenceUnavailable;

            profile.Jobs.Clear();
            profile.Jobs.AddRange(
                humanoid.JobPriorities
                    .Where(j => j.Value != JobPriority.Never)
                    .Select(j => new Job {JobName = j.Key, Priority = (DbJobPriority) j.Value})
            );

            profile.Antags.Clear();
            profile.Antags.AddRange(
                humanoid.AntagPreferences
                    .Select(a => new Antag {AntagName = a})
            );

            profile.Traits.Clear();
            profile.Traits.AddRange(
                humanoid.TraitPreferences
                        .Select(t => new Trait {TraitName = t})
            );

            return profile;
        }
        #endregion

        #region User Ids
        public async Task<NetUserId?> GetAssignedUserIdAsync(string name)
        {
            await using var db = await GetDb();

            var assigned = await db.DbContext.AssignedUserId.SingleOrDefaultAsync(p => p.UserName == name);
            return assigned?.UserId is { } g ? new NetUserId(g) : default(NetUserId?);
        }

        public async Task AssignUserIdAsync(string name, NetUserId netUserId)
        {
            await using var db = await GetDb();

            db.DbContext.AssignedUserId.Add(new AssignedUserId
            {
                UserId = netUserId.UserId,
                UserName = name
            });

            await db.DbContext.SaveChangesAsync();
        }
        #endregion

        #region Bans
        /*
         * BAN STUFF
         */
        /// <summary>
        ///     Looks up a ban by id.
        ///     This will return a pardoned ban as well.
        /// </summary>
        /// <param name="id">The ban id to look for.</param>
        /// <returns>The ban with the given id or null if none exist.</returns>
        public abstract Task<ServerBanDef?> GetServerBanAsync(int id);

        /// <summary>
        ///     Looks up an user's most recent received un-pardoned ban.
        ///     This will NOT return a pardoned ban.
        ///     One of <see cref="address"/> or <see cref="userId"/> need to not be null.
        /// </summary>
        /// <param name="address">The ip address of the user.</param>
        /// <param name="userId">The id of the user.</param>
        /// <param name="hwId">The HWId of the user.</param>
        /// <returns>The user's latest received un-pardoned ban, or null if none exist.</returns>
        public abstract Task<ServerBanDef?> GetServerBanAsync(
            IPAddress? address,
            NetUserId? userId,
            ImmutableArray<byte>? hwId);

        /// <summary>
        ///     Looks up an user's ban history.
        ///     This will return pardoned bans as well.
        ///     One of <see cref="address"/> or <see cref="userId"/> need to not be null.
        /// </summary>
        /// <param name="address">The ip address of the user.</param>
        /// <param name="userId">The id of the user.</param>
        /// <param name="hwId">The HWId of the user.</param>
        /// <param name="includeUnbanned">Include pardoned and expired bans.</param>
        /// <returns>The user's ban history.</returns>
        public abstract Task<List<ServerBanDef>> GetServerBansAsync(
            IPAddress? address,
            NetUserId? userId,
            ImmutableArray<byte>? hwId,
            bool includeUnbanned);

        public abstract Task AddServerBanAsync(ServerBanDef serverBan);
        public abstract Task AddServerUnbanAsync(ServerUnbanDef serverUnban);

        public async Task EditServerBan(int id, string reason, NoteSeverity severity, DateTime? expiration, Guid editedBy, DateTime editedAt)
        {
            await using var db = await GetDb();

            var ban = await db.DbContext.Ban.SingleOrDefaultAsync(b => b.Id == id);
            if (ban is null)
                return;
            ban.Severity = severity;
            ban.Reason = reason;
            ban.ExpirationTime = expiration;
            ban.LastEditedById = editedBy;
            ban.LastEditedAt = editedAt;
            await db.DbContext.SaveChangesAsync();
        }

        protected static async Task<ServerBanExemptFlags?> GetBanExemptionCore(DbGuard db, NetUserId? userId)
        {
            if (userId == null)
                return null;

            var exemption = await db.DbContext.BanExemption
                .SingleOrDefaultAsync(e => e.UserId == userId.Value.UserId);

            return exemption?.Flags;
        }

        public async Task UpdateBanExemption(NetUserId userId, ServerBanExemptFlags flags)
        {
            await using var db = await GetDb();

            if (flags == 0)
            {
                // Delete whatever is there.
                await db.DbContext.BanExemption.Where(u => u.UserId == userId.UserId).ExecuteDeleteAsync();
                return;
            }

            var exemption = await db.DbContext.BanExemption.SingleOrDefaultAsync(u => u.UserId == userId.UserId);
            if (exemption == null)
            {
                exemption = new ServerBanExemption
                {
                    UserId = userId
                };

                db.DbContext.BanExemption.Add(exemption);
            }

            exemption.Flags = flags;
            await db.DbContext.SaveChangesAsync();
        }

        public async Task<ServerBanExemptFlags> GetBanExemption(NetUserId userId)
        {
            await using var db = await GetDb();

            var flags = await GetBanExemptionCore(db, userId);
            return flags ?? ServerBanExemptFlags.None;
        }

        #endregion

        #region Role Bans
        /*
         * ROLE BANS
         */
        /// <summary>
        ///     Looks up a role ban by id.
        ///     This will return a pardoned role ban as well.
        /// </summary>
        /// <param name="id">The role ban id to look for.</param>
        /// <returns>The role ban with the given id or null if none exist.</returns>
        public abstract Task<ServerRoleBanDef?> GetServerRoleBanAsync(int id);

        /// <summary>
        ///     Looks up an user's role ban history.
        ///     This will return pardoned role bans based on the <see cref="includeUnbanned"/> bool.
        ///     Requires one of <see cref="address"/>, <see cref="userId"/>, or <see cref="hwId"/> to not be null.
        /// </summary>
        /// <param name="address">The IP address of the user.</param>
        /// <param name="userId">The NetUserId of the user.</param>
        /// <param name="hwId">The Hardware Id of the user.</param>
        /// <param name="includeUnbanned">Whether expired and pardoned bans are included.</param>
        /// <returns>The user's role ban history.</returns>
        public abstract Task<List<ServerRoleBanDef>> GetServerRoleBansAsync(IPAddress? address,
            NetUserId? userId,
            ImmutableArray<byte>? hwId,
            bool includeUnbanned);

        public abstract Task AddServerRoleBanAsync(ServerRoleBanDef serverRoleBan);
        public abstract Task AddServerRoleUnbanAsync(ServerRoleUnbanDef serverRoleUnban);

        public async Task EditServerRoleBan(int id, string reason, NoteSeverity severity, DateTime? expiration, Guid editedBy, DateTime editedAt)
        {
            await using var db = await GetDb();

            var ban = await db.DbContext.RoleBan.SingleOrDefaultAsync(b => b.Id == id);
            if (ban is null)
                return;
            ban.Severity = severity;
            ban.Reason = reason;
            ban.ExpirationTime = expiration;
            ban.LastEditedById = editedBy;
            ban.LastEditedAt = editedAt;
            await db.DbContext.SaveChangesAsync();
        }
        #endregion

        #region Playtime
        public async Task<List<PlayTime>> GetPlayTimes(Guid player)
        {
            await using var db = await GetDb();

            return await db.DbContext.PlayTime
                .Where(p => p.PlayerId == player)
                .ToListAsync();
        }

        public async Task UpdatePlayTimes(IReadOnlyCollection<PlayTimeUpdate> updates)
        {
            await using var db = await GetDb();

            // Ideally I would just be able to send a bunch of UPSERT commands, but EFCore is a pile of garbage.
            // So... In the interest of not making this take forever at high update counts...
            // Bulk-load play time objects for all players involved.
            // This allows us to semi-efficiently load all entities we need in a single DB query.
            // Then we can update & insert without further round-trips to the DB.

            var players = updates.Select(u => u.User.UserId).Distinct().ToArray();
            var dbTimes = (await db.DbContext.PlayTime
                    .Where(p => players.Contains(p.PlayerId))
                    .ToArrayAsync())
                .GroupBy(p => p.PlayerId)
                .ToDictionary(g => g.Key, g => g.ToDictionary(p => p.Tracker, p => p));

            foreach (var (user, tracker, time) in updates)
            {
                if (dbTimes.TryGetValue(user.UserId, out var userTimes)
                    && userTimes.TryGetValue(tracker, out var ent))
                {
                    // Already have a tracker in the database, update it.
                    ent.TimeSpent = time;
                    continue;
                }

                // No tracker, make a new one.
                var playTime = new PlayTime
                {
                    Tracker = tracker,
                    PlayerId = user.UserId,
                    TimeSpent = time
                };

                db.DbContext.PlayTime.Add(playTime);
            }

            await db.DbContext.SaveChangesAsync();
        }

        #endregion

        #region Player Records
        /*
         * PLAYER RECORDS
         */
        public async Task UpdatePlayerRecord(
            NetUserId userId,
            string userName,
            IPAddress address,
            ImmutableArray<byte> hwId)
        {
            await using var db = await GetDb();

            var record = await db.DbContext.Player.SingleOrDefaultAsync(p => p.UserId == userId.UserId);
            if (record == null)
            {
                db.DbContext.Player.Add(record = new Player
                {
                    FirstSeenTime = DateTime.UtcNow,
                    UserId = userId.UserId,
                });
            }

            record.LastSeenTime = DateTime.UtcNow;
            record.LastSeenAddress = address;
            record.LastSeenUserName = userName;
            record.LastSeenHWId = hwId.ToArray();

            await db.DbContext.SaveChangesAsync();
        }

        public async Task<PlayerRecord?> GetPlayerRecordByUserName(string userName, CancellationToken cancel)
        {
            await using var db = await GetDb();

            // Sort by descending last seen time.
            // So if, due to account renames, we have two people with the same username in the DB,
            // the most recent one is picked.
            var record = await db.DbContext.Player
                .OrderByDescending(p => p.LastSeenTime)
                .FirstOrDefaultAsync(p => p.LastSeenUserName == userName, cancel);

            return record == null ? null : MakePlayerRecord(record);
        }

        public async Task<PlayerRecord?> GetPlayerRecordByUserId(NetUserId userId, CancellationToken cancel)
        {
            await using var db = await GetDb();

            var record = await db.DbContext.Player
                .SingleOrDefaultAsync(p => p.UserId == userId.UserId, cancel);

            return record == null ? null : MakePlayerRecord(record);
        }

        protected abstract PlayerRecord MakePlayerRecord(Player player);
        #endregion

        #region Connection Logs
        /*
         * CONNECTION LOG
         */
        public abstract Task<int> AddConnectionLogAsync(
            NetUserId userId,
            string userName,
            IPAddress address,
            ImmutableArray<byte> hwId,
            ConnectionDenyReason? denied);

        public async Task AddServerBanHitsAsync(int connection, IEnumerable<ServerBanDef> bans)
        {
            await using var db = await GetDb();

            foreach (var ban in bans)
            {
                db.DbContext.ServerBanHit.Add(new ServerBanHit
                {
                    ConnectionId = connection, BanId = ban.Id!.Value
                });
            }

            await db.DbContext.SaveChangesAsync();
        }

        #endregion

        #region Admin Ranks
        /*
         * ADMIN RANKS
         */
        public async Task<Admin?> GetAdminDataForAsync(NetUserId userId, CancellationToken cancel)
        {
            await using var db = await GetDb();

            return await db.DbContext.Admin
                .Include(p => p.Flags)
                .Include(p => p.AdminRank)
                .ThenInclude(p => p!.Flags)
                .AsSplitQuery() // tests fail because of a random warning if you dont have this!
                .SingleOrDefaultAsync(p => p.UserId == userId.UserId, cancel);
        }

        public abstract Task<((Admin, string? lastUserName)[] admins, AdminRank[])>
            GetAllAdminAndRanksAsync(CancellationToken cancel);

        public async Task<AdminRank?> GetAdminRankDataForAsync(int id, CancellationToken cancel = default)
        {
            await using var db = await GetDb();

            return await db.DbContext.AdminRank
                .Include(r => r.Flags)
                .SingleOrDefaultAsync(r => r.Id == id, cancel);
        }

        public async Task RemoveAdminAsync(NetUserId userId, CancellationToken cancel)
        {
            await using var db = await GetDb();

            var admin = await db.DbContext.Admin.SingleAsync(a => a.UserId == userId.UserId, cancel);
            db.DbContext.Admin.Remove(admin);

            await db.DbContext.SaveChangesAsync(cancel);
        }

        public async Task AddAdminAsync(Admin admin, CancellationToken cancel)
        {
            await using var db = await GetDb();

            db.DbContext.Admin.Add(admin);

            await db.DbContext.SaveChangesAsync(cancel);
        }

        public async Task UpdateAdminAsync(Admin admin, CancellationToken cancel)
        {
            await using var db = await GetDb();

            var existing = await db.DbContext.Admin.Include(a => a.Flags).SingleAsync(a => a.UserId == admin.UserId, cancel);
            existing.Flags = admin.Flags;
            existing.Title = admin.Title;
            existing.AdminRankId = admin.AdminRankId;

            await db.DbContext.SaveChangesAsync(cancel);
        }

        public async Task RemoveAdminRankAsync(int rankId, CancellationToken cancel)
        {
            await using var db = await GetDb();

            var admin = await db.DbContext.AdminRank.SingleAsync(a => a.Id == rankId, cancel);
            db.DbContext.AdminRank.Remove(admin);

            await db.DbContext.SaveChangesAsync(cancel);
        }

        public async Task AddAdminRankAsync(AdminRank rank, CancellationToken cancel)
        {
            await using var db = await GetDb();

            db.DbContext.AdminRank.Add(rank);

            await db.DbContext.SaveChangesAsync(cancel);
        }

        public virtual async Task<int> AddNewRound(Server server, params Guid[] playerIds)
        {
            await using var db = await GetDb();

            var players = await db.DbContext.Player
                .Where(player => playerIds.Contains(player.UserId))
                .ToListAsync();

            var round = new Round
            {
                Players = players,
                ServerId = server.Id
            };

            db.DbContext.Round.Add(round);

            await db.DbContext.SaveChangesAsync();

            return round.Id;
        }

        public async Task<Round> GetRound(int id)
        {
            await using var db = await GetDb();

            var round = await db.DbContext.Round
                .Include(round => round.Players)
                .SingleAsync(round => round.Id == id);

            return round;
        }

        public async Task AddRoundPlayers(int id, Guid[] playerIds)
        {
            await using var db = await GetDb();

            // ReSharper disable once SuggestVarOrType_Elsewhere
            Dictionary<Guid, int> players = await db.DbContext.Player
                .Where(player => playerIds.Contains(player.UserId))
                .ToDictionaryAsync(player => player.UserId, player => player.Id);

            foreach (var player in playerIds)
            {
                await db.DbContext.Database.ExecuteSqlAsync($"""
INSERT INTO player_round (players_id, rounds_id) VALUES ({players[player]}, {id}) ON CONFLICT DO NOTHING
""");
            }

            await db.DbContext.SaveChangesAsync();
        }

        public async Task UpdateAdminRankAsync(AdminRank rank, CancellationToken cancel)
        {
            await using var db = await GetDb();

            var existing = await db.DbContext.AdminRank
                .Include(r => r.Flags)
                .SingleAsync(a => a.Id == rank.Id, cancel);

            existing.Flags = rank.Flags;
            existing.Name = rank.Name;

            await db.DbContext.SaveChangesAsync(cancel);
        }
        #endregion

        #region Admin Logs

        public async Task<(Server, bool existed)> AddOrGetServer(string serverName)
        {
            await using var db = await GetDb();
            var server = await db.DbContext.Server
                .Where(server => server.Name.Equals(serverName))
                .SingleOrDefaultAsync();

            if (server != default)
                return (server, true);

            server = new Server
            {
                Name = serverName
            };

            db.DbContext.Server.Add(server);

            await db.DbContext.SaveChangesAsync();

            return (server, false);
        }

        public async Task AddAdminLogs(List<AdminLog> logs)
        {
            DebugTools.Assert(logs.All(x => x.RoundId > 0), "Adding logs with invalid round ids.");
            await using var db = await GetDb();
            db.DbContext.AdminLog.AddRange(logs);
            await db.DbContext.SaveChangesAsync();
        }

        private static IQueryable<AdminLog> GetAdminLogsQuery(ServerDbContext db, LogFilter? filter = null)
        {
            IQueryable<AdminLog> query = db.AdminLog;

            if (filter == null)
            {
                return query.OrderBy(log => log.Date);
            }

            if (filter.Round != null)
            {
                query = query.Where(log => log.RoundId == filter.Round);
            }

            if (filter.Search != null)
            {
                query = query.Where(log => log.Message.Contains(filter.Search));
            }

            if (filter.Types != null)
            {
                query = query.Where(log => filter.Types.Contains(log.Type));
            }

            if (filter.Impacts != null)
            {
                query = query.Where(log => filter.Impacts.Contains(log.Impact));
            }

            if (filter.Before != null)
            {
                query = query.Where(log => log.Date < filter.Before);
            }

            if (filter.After != null)
            {
                query = query.Where(log => log.Date > filter.After);
            }

            if (filter.IncludePlayers)
            {
                if (filter.AnyPlayers != null)
                {
                    query = query.Where(log =>
                        log.Players.Any(p => filter.AnyPlayers.Contains(p.PlayerUserId)) ||
                        log.Players.Count == 0 && filter.IncludeNonPlayers);
                }

                if (filter.AllPlayers != null)
                {
                    query = query.Where(log =>
                        log.Players.All(p => filter.AllPlayers.Contains(p.PlayerUserId)) ||
                        log.Players.Count == 0 && filter.IncludeNonPlayers);
                }
            }
            else
            {
                query = query.Where(log => log.Players.Count == 0);
            }

            if (filter.LastLogId != null)
            {
                query = filter.DateOrder switch
                {
                    DateOrder.Ascending => query.Where(log => log.Id > filter.LastLogId),
                    DateOrder.Descending => query.Where(log => log.Id < filter.LastLogId),
                    _ => throw new ArgumentOutOfRangeException(nameof(filter),
                        $"Unknown {nameof(DateOrder)} value {filter.DateOrder}")
                };
            }

            query = filter.DateOrder switch
            {
                DateOrder.Ascending => query.OrderBy(log => log.Date),
                DateOrder.Descending => query.OrderByDescending(log => log.Date),
                _ => throw new ArgumentOutOfRangeException(nameof(filter),
                    $"Unknown {nameof(DateOrder)} value {filter.DateOrder}")
            };

            const int hardLogLimit = 500_000;
            if (filter.Limit != null)
            {
                query = query.Take(Math.Min(filter.Limit.Value, hardLogLimit));
            }
            else
            {
                query = query.Take(hardLogLimit);
            }

            return query;
        }

        public async IAsyncEnumerable<string> GetAdminLogMessages(LogFilter? filter = null)
        {
            await using var db = await GetDb();
            var query = GetAdminLogsQuery(db.DbContext, filter);

            await foreach (var log in query.Select(log => log.Message).AsAsyncEnumerable())
            {
                yield return log;
            }
        }

        public async IAsyncEnumerable<SharedAdminLog> GetAdminLogs(LogFilter? filter = null)
        {
            await using var db = await GetDb();
            var query = GetAdminLogsQuery(db.DbContext, filter);
            query = query.Include(log => log.Players);

            await foreach (var log in query.AsAsyncEnumerable())
            {
                var players = new Guid[log.Players.Count];
                for (var i = 0; i < log.Players.Count; i++)
                {
                    players[i] = log.Players[i].PlayerUserId;
                }

                yield return new SharedAdminLog(log.Id, log.Type, log.Impact, log.Date, log.Message, players);
            }
        }

        public async IAsyncEnumerable<JsonDocument> GetAdminLogsJson(LogFilter? filter = null)
        {
            await using var db = await GetDb();
            var query = GetAdminLogsQuery(db.DbContext, filter);

            await foreach (var json in query.Select(log => log.Json).AsAsyncEnumerable())
            {
                yield return json;
            }
        }

        public async Task<int> CountAdminLogs(int round)
        {
            await using var db = await GetDb();
            return await db.DbContext.AdminLog.CountAsync(log => log.RoundId == round);
        }

        #endregion

        #region Whitelist

        public async Task<bool> GetWhitelistStatusAsync(NetUserId player)
        {
            await using var db = await GetDb();

            return await db.DbContext.Whitelist.AnyAsync(w => w.UserId == player);
        }

        public async Task AddToWhitelistAsync(NetUserId player)
        {
            await using var db = await GetDb();

            db.DbContext.Whitelist.Add(new Whitelist { UserId = player });
            await db.DbContext.SaveChangesAsync();
        }

        public async Task RemoveFromWhitelistAsync(NetUserId player)
        {
            await using var db = await GetDb();
            var entry = await db.DbContext.Whitelist.SingleAsync(w => w.UserId == player);
            db.DbContext.Whitelist.Remove(entry);
            await db.DbContext.SaveChangesAsync();
        }

        public async Task<DateTime?> GetLastReadRules(NetUserId player)
        {
            await using var db = await GetDb();

            return await db.DbContext.Player
                .Where(dbPlayer => dbPlayer.UserId == player)
                .Select(dbPlayer => dbPlayer.LastReadRules)
                .SingleOrDefaultAsync();
        }

        public async Task SetLastReadRules(NetUserId player, DateTime date)
        {
            await using var db = await GetDb();

            var dbPlayer = await db.DbContext.Player.Where(dbPlayer => dbPlayer.UserId == player).SingleOrDefaultAsync();
            if (dbPlayer == null)
            {
                return;
            }

            dbPlayer.LastReadRules = date;
            await db.DbContext.SaveChangesAsync();
        }

        #endregion

        #region Uploaded Resources Logs

        public async Task AddUploadedResourceLogAsync(NetUserId user, DateTime date, string path, byte[] data)
        {
            await using var db = await GetDb();

            db.DbContext.UploadedResourceLog.Add(new UploadedResourceLog() { UserId = user, Date = date, Path = path, Data = data });
            await db.DbContext.SaveChangesAsync();
        }

        public async Task PurgeUploadedResourceLogAsync(int days)
        {
            await using var db = await GetDb();

            var date = DateTime.Now.Subtract(TimeSpan.FromDays(days));

            await foreach (var log in db.DbContext.UploadedResourceLog
                               .Where(l => date > l.Date)
                               .AsAsyncEnumerable())
            {
                db.DbContext.UploadedResourceLog.Remove(log);
            }

            await db.DbContext.SaveChangesAsync();
        }

        #endregion

        #region Admin Notes

        public virtual async Task<int> AddAdminNote(AdminNote note)
        {
            await using var db = await GetDb();
            db.DbContext.AdminNotes.Add(note);
            await db.DbContext.SaveChangesAsync();
            return note.Id;
        }

        public virtual async Task<int> AddAdminWatchlist(AdminWatchlist watchlist)
        {
            await using var db = await GetDb();
            db.DbContext.AdminWatchlists.Add(watchlist);
            await db.DbContext.SaveChangesAsync();
            return watchlist.Id;
        }

        public virtual async Task<int> AddAdminMessage(AdminMessage message)
        {
            await using var db = await GetDb();
            db.DbContext.AdminMessages.Add(message);
            await db.DbContext.SaveChangesAsync();
            return message.Id;
        }

        public async Task<AdminNote?> GetAdminNote(int id)
        {
            await using var db = await GetDb();
            return await db.DbContext.AdminNotes
                .Where(note => note.Id == id)
                .Include(note => note.Round)
                .ThenInclude(r => r!.Server)
                .Include(note => note.CreatedBy)
                .Include(note => note.LastEditedBy)
                .Include(note => note.DeletedBy)
                .Include(note => note.Player)
                .SingleOrDefaultAsync();
        }

        public async Task<AdminWatchlist?> GetAdminWatchlist(int id)
        {
            await using var db = await GetDb();
            return await db.DbContext.AdminWatchlists
                .Where(note => note.Id == id)
                .Include(note => note.Round)
                .ThenInclude(r => r!.Server)
                .Include(note => note.CreatedBy)
                .Include(note => note.LastEditedBy)
                .Include(note => note.DeletedBy)
                .Include(note => note.Player)
                .SingleOrDefaultAsync();
        }

        public async Task<AdminMessage?> GetAdminMessage(int id)
        {
            await using var db = await GetDb();
            return await db.DbContext.AdminMessages
                .Where(note => note.Id == id)
                .Include(note => note.Round)
                .ThenInclude(r => r!.Server)
                .Include(note => note.CreatedBy)
                .Include(note => note.LastEditedBy)
                .Include(note => note.DeletedBy)
                .Include(note => note.Player)
                .SingleOrDefaultAsync();
        }

        public async Task<ServerBanNote?> GetServerBanAsNoteAsync(int id)
        {
            await using var db = await GetDb();

            var ban = await db.DbContext.Ban
                .Include(ban => ban.Unban)
                .Include(ban => ban.Round)
                .ThenInclude(r => r!.Server)
                .Include(ban => ban.CreatedBy)
                .Include(ban => ban.LastEditedBy)
                .Include(ban => ban.Unban)
                .SingleOrDefaultAsync(b => b.Id == id);

            if (ban is null)
                return null;

            var player = await db.DbContext.Player.SingleOrDefaultAsync(p => p.UserId == ban.PlayerUserId);
            return new ServerBanNote(ban.Id, ban.RoundId, ban.Round, ban.PlayerUserId, player,
                ban.PlaytimeAtNote, ban.Reason, ban.Severity, ban.CreatedBy, ban.BanTime,
                ban.LastEditedBy, ban.LastEditedAt, ban.ExpirationTime, ban.Hidden,
                ban.Unban?.UnbanningAdmin == null
                    ? null
                    : await db.DbContext.Player.SingleOrDefaultAsync(p =>
                        p.UserId == ban.Unban.UnbanningAdmin.Value),
                ban.Unban?.UnbanTime);
        }

        public async Task<ServerRoleBanNote?> GetServerRoleBanAsNoteAsync(int id)
        {
            await using var db = await GetDb();

            var ban = await db.DbContext.RoleBan
                .Include(b => b.Unban)
                .SingleOrDefaultAsync(b => b.Id == id);

            if (ban is null)
                return null;

            var player = await db.DbContext.Player.SingleOrDefaultAsync(p => p.UserId == ban.PlayerUserId);
            var unbanningAdmin =
                ban.Unban is null
                ? null
                : await db.DbContext.Player.SingleOrDefaultAsync(b => b.UserId == ban.Unban.UnbanningAdmin);
            return new ServerRoleBanNote(ban.Id, ban.RoundId, ban.Round, ban.PlayerUserId,
                player, ban.PlaytimeAtNote, ban.Reason, ban.Severity, ban.CreatedBy,
                ban.BanTime, ban.LastEditedBy, ban.LastEditedAt, ban.ExpirationTime,
                ban.Hidden, new [] { ban.RoleId.Replace(BanManager.JobPrefix, null) },
                unbanningAdmin, ban.Unban?.UnbanTime);
        }

        public async Task<List<IAdminRemarksCommon>> GetAllAdminRemarks(Guid player)
        {
            await using var db = await GetDb();
            List<IAdminRemarksCommon> notes = new();
            notes.AddRange(
                await (from note in db.DbContext.AdminNotes
                       where note.PlayerUserId == player &&
                             !note.Deleted &&
                             (note.ExpirationTime == null || DateTime.UtcNow < note.ExpirationTime)
                       select note)
                .Include(note => note.Round)
                .ThenInclude(r => r!.Server)
                .Include(note => note.CreatedBy)
                .Include(note => note.LastEditedBy)
                .Include(note => note.Player)
                .ToListAsync());
            notes.AddRange(await GetActiveWatchlistsImpl(db, player));
            notes.AddRange(await GetMessagesImpl(db, player));
            notes.AddRange(await GetServerBansAsNotesForUser(db, player));
            notes.AddRange(await GetGroupedServerRoleBansAsNotesForUser(db, player));
            return notes;
        }
        public async Task EditAdminNote(int id, string message, NoteSeverity severity, bool secret, Guid editedBy, DateTime editedAt, DateTime? expiryTime)
        {
            await using var db = await GetDb();

            var note = await db.DbContext.AdminNotes.Where(note => note.Id == id).SingleAsync();
            note.Message = message;
            note.Severity = severity;
            note.Secret = secret;
            note.LastEditedById = editedBy;
            note.LastEditedAt = editedAt;
            note.ExpirationTime = expiryTime;

            await db.DbContext.SaveChangesAsync();
        }

        public async Task EditAdminWatchlist(int id, string message, Guid editedBy, DateTime editedAt, DateTime? expiryTime)
        {
            await using var db = await GetDb();

            var note = await db.DbContext.AdminWatchlists.Where(note => note.Id == id).SingleAsync();
            note.Message = message;
            note.LastEditedById = editedBy;
            note.LastEditedAt = editedAt;
            note.ExpirationTime = expiryTime;

            await db.DbContext.SaveChangesAsync();
        }

        public async Task EditAdminMessage(int id, string message, Guid editedBy, DateTime editedAt, DateTime? expiryTime)
        {
            await using var db = await GetDb();

            var note = await db.DbContext.AdminMessages.Where(note => note.Id == id).SingleAsync();
            note.Message = message;
            note.LastEditedById = editedBy;
            note.LastEditedAt = editedAt;
            note.ExpirationTime = expiryTime;

            await db.DbContext.SaveChangesAsync();
        }

        public async Task DeleteAdminNote(int id, Guid deletedBy, DateTime deletedAt)
        {
            await using var db = await GetDb();

            var note = await db.DbContext.AdminNotes.Where(note => note.Id == id).SingleAsync();

            note.Deleted = true;
            note.DeletedById = deletedBy;
            note.DeletedAt = deletedAt;

            await db.DbContext.SaveChangesAsync();
        }

        public async Task DeleteAdminWatchlist(int id, Guid deletedBy, DateTime deletedAt)
        {
            await using var db = await GetDb();

            var watchlist = await db.DbContext.AdminWatchlists.Where(note => note.Id == id).SingleAsync();

            watchlist.Deleted = true;
            watchlist.DeletedById = deletedBy;
            watchlist.DeletedAt = deletedAt;

            await db.DbContext.SaveChangesAsync();
        }

        public async Task DeleteAdminMessage(int id, Guid deletedBy, DateTime deletedAt)
        {
            await using var db = await GetDb();

            var message = await db.DbContext.AdminMessages.Where(note => note.Id == id).SingleAsync();

            message.Deleted = true;
            message.DeletedById = deletedBy;
            message.DeletedAt = deletedAt;

            await db.DbContext.SaveChangesAsync();
        }

        public async Task HideServerBanFromNotes(int id, Guid deletedBy, DateTime deletedAt)
        {
            await using var db = await GetDb();

            var ban = await db.DbContext.Ban.Where(ban => ban.Id == id).SingleAsync();

            ban.Hidden = true;
            ban.LastEditedById = deletedBy;
            ban.LastEditedAt = deletedAt;

            await db.DbContext.SaveChangesAsync();
        }

        public async Task HideServerRoleBanFromNotes(int id, Guid deletedBy, DateTime deletedAt)
        {
            await using var db = await GetDb();

            var roleBan = await db.DbContext.RoleBan.Where(roleBan => roleBan.Id == id).SingleAsync();

            roleBan.Hidden = true;
            roleBan.LastEditedById = deletedBy;
            roleBan.LastEditedAt = deletedAt;

            await db.DbContext.SaveChangesAsync();
        }

        public async Task<List<IAdminRemarksCommon>> GetVisibleAdminRemarks(Guid player)
        {
            await using var db = await GetDb();
            List<IAdminRemarksCommon> notesCol = new();
            notesCol.AddRange(
                await (from note in db.DbContext.AdminNotes
                       where note.PlayerUserId == player &&
                             !note.Secret &&
                             !note.Deleted &&
                             (note.ExpirationTime == null || DateTime.UtcNow < note.ExpirationTime)
                       select note)
                .Include(note => note.Round)
                .ThenInclude(r => r!.Server)
                .Include(note => note.CreatedBy)
                .Include(note => note.Player)
                .ToListAsync());
            notesCol.AddRange(await GetMessagesImpl(db, player));
            return notesCol;
        }

        public async Task<List<AdminWatchlist>> GetActiveWatchlists(Guid player)
        {
            await using var db = await GetDb();
            return await GetActiveWatchlistsImpl(db, player);
        }

        protected async Task<List<AdminWatchlist>> GetActiveWatchlistsImpl(DbGuard db, Guid player)
        {
            return await (from watchlist in db.DbContext.AdminWatchlists
                          where watchlist.PlayerUserId == player &&
                                !watchlist.Deleted &&
                                (watchlist.ExpirationTime == null || DateTime.UtcNow < watchlist.ExpirationTime)
                          select watchlist)
                .Include(note => note.Round)
                .ThenInclude(r => r!.Server)
                .Include(note => note.CreatedBy)
                .Include(note => note.LastEditedBy)
                .Include(note => note.Player)
                .ToListAsync();
        }

        public async Task<List<AdminMessage>> GetMessages(Guid player)
        {
            await using var db = await GetDb();
            return await GetMessagesImpl(db, player);
        }

        protected async Task<List<AdminMessage>> GetMessagesImpl(DbGuard db, Guid player)
        {
            return await (from message in db.DbContext.AdminMessages
                          where message.PlayerUserId == player &&
                                !message.Deleted &&
                                (message.ExpirationTime == null || DateTime.UtcNow < message.ExpirationTime)
                          select message)
                .Include(note => note.Round)
                .ThenInclude(r => r!.Server)
                .Include(note => note.CreatedBy)
                .Include(note => note.LastEditedBy)
                .Include(note => note.Player)
                .ToListAsync();
        }

        public async Task MarkMessageAsSeen(int id)
        {
            await using var db = await GetDb();
            var message = await db.DbContext.AdminMessages.SingleAsync(m => m.Id == id);
            message.Seen = true;
            await db.DbContext.SaveChangesAsync();
        }

        // These two are here because they get converted into notes later
        protected async Task<List<ServerBanNote>> GetServerBansAsNotesForUser(DbGuard db, Guid user)
        {
            // You can't group queries, as player will not always exist. When it doesn't, the
            // whole query returns nothing
            var player = await db.DbContext.Player.SingleOrDefaultAsync(p => p.UserId == user);
            var bans = await db.DbContext.Ban
                .Where(ban => ban.PlayerUserId == user && !ban.Hidden)
                .Include(ban => ban.Unban)
                .Include(ban => ban.Round)
                .ThenInclude(r => r!.Server)
                .Include(ban => ban.CreatedBy)
                .Include(ban => ban.LastEditedBy)
                .Include(ban => ban.Unban)
                .ToArrayAsync();

            var banNotes = new List<ServerBanNote>();
            foreach (var ban in bans)
            {
                var banNote = new ServerBanNote(ban.Id, ban.RoundId, ban.Round, ban.PlayerUserId, player,
                    ban.PlaytimeAtNote, ban.Reason, ban.Severity, ban.CreatedBy, ban.BanTime,
                    ban.LastEditedBy, ban.LastEditedAt, ban.ExpirationTime, ban.Hidden,
                    ban.Unban?.UnbanningAdmin == null
                        ? null
                        : await db.DbContext.Player.SingleOrDefaultAsync(
                            p => p.UserId == ban.Unban.UnbanningAdmin.Value),
                    ban.Unban?.UnbanTime);

                banNotes.Add(banNote);
            }

            return banNotes;
        }

        protected async Task<List<ServerRoleBanNote>> GetGroupedServerRoleBansAsNotesForUser(DbGuard db, Guid user)
        {
            // Server side query
            var bansQuery = await db.DbContext.RoleBan
                .Where(ban => ban.PlayerUserId == user && !ban.Hidden)
                .Include(ban => ban.Unban)
                .Include(ban => ban.Round)
                .ThenInclude(r => r!.Server)
                .Include(ban => ban.CreatedBy)
                .Include(ban => ban.LastEditedBy)
                .Include(ban => ban.Unban)
                .ToArrayAsync();

            // Client side query, as EF can't do groups yet
            var bansEnumerable = bansQuery
                    .GroupBy(ban => new { ban.BanTime, CreatedBy = (Player?)ban.CreatedBy, ban.Reason, Unbanned = ban.Unban == null })
                    .Select(banGroup => banGroup)
                    .ToArray();

            List<ServerRoleBanNote> bans = new();
            var player = await db.DbContext.Player.SingleOrDefaultAsync(p => p.UserId == user);
            foreach (var banGroup in bansEnumerable)
            {
                var firstBan = banGroup.First();
                Player? unbanningAdmin = null;

                if (firstBan.Unban?.UnbanningAdmin is not null)
                    unbanningAdmin = await db.DbContext.Player.SingleOrDefaultAsync(p => p.UserId == firstBan.Unban.UnbanningAdmin.Value);

                bans.Add(new ServerRoleBanNote(firstBan.Id, firstBan.RoundId, firstBan.Round, firstBan.PlayerUserId,
                    player, firstBan.PlaytimeAtNote, firstBan.Reason, firstBan.Severity, firstBan.CreatedBy,
                    firstBan.BanTime, firstBan.LastEditedBy, firstBan.LastEditedAt, firstBan.ExpirationTime,
                    firstBan.Hidden, banGroup.Select(ban => ban.RoleId.Replace(BanManager.JobPrefix, null)).ToArray(),
                    unbanningAdmin, firstBan.Unban?.UnbanTime));
            }

            return bans;
        }

        #endregion

        protected abstract Task<DbGuard> GetDb();

        protected abstract class DbGuard : IAsyncDisposable
        {
            public abstract ServerDbContext DbContext { get; }

            public abstract ValueTask DisposeAsync();
        }
    }
}