using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Runtime.InteropServices;
using Content.Server.Administration.Logs;
using Content.Server.Administration.Managers;
using Content.Server.Administration.Systems;
using Content.Server.MoMMI;
using Content.Server.Players.RateLimiting;
using Content.Server.Preferences.Managers;
using Content.Shared.Administration;
using Content.Shared.CCVar;
using Content.Shared.Chat;
using Content.Shared.Database;
using Content.Shared.Mind;
using Robust.Shared.Configuration;
using Robust.Shared.Network;
using Robust.Shared.Player;
using Robust.Shared.Replays;
using Robust.Shared.Utility;

namespace Content.Server.Chat.Managers
{
    /// <summary>
    ///     Dispatches chat messages to clients.
    /// </summary>
    internal sealed partial class ChatManager : IChatManager
    {
        private static readonly Dictionary<string, string> PatronOocColors = new()
        {
            // I had plans for multiple colors and those went nowhere so...
            { "nuclear_operative", "#aa00ff" },
            { "syndicate_agent", "#aa00ff" },
            { "revolutionary", "#aa00ff" }
        };

        [Dependency] private readonly IReplayRecordingManager _replay = default!;
        [Dependency] private readonly IServerNetManager _netManager = default!;
        [Dependency] private readonly IMoMMILink _mommiLink = default!;
        [Dependency] private readonly IAdminManager _adminManager = default!;
        [Dependency] private readonly IAdminLogManager _adminLogger = default!;
        [Dependency] private readonly IServerPreferencesManager _preferencesManager = default!;
        [Dependency] private readonly IConfigurationManager _configurationManager = default!;
        [Dependency] private readonly INetConfigurationManager _netConfigManager = default!;
        [Dependency] private readonly IEntityManager _entityManager = default!;
        [Dependency] private readonly PlayerRateLimitManager _rateLimitManager = default!;

        /// <summary>
        /// The maximum length a player-sent message can be sent
        /// </summary>
        public int MaxMessageLength => _configurationManager.GetCVar(CCVars.ChatMaxMessageLength);

        private bool _oocEnabled = true;
        private bool _adminOocEnabled = true;

        private readonly Dictionary<NetUserId, ChatUser> _players = new();

        public void Initialize()
        {
            _netManager.RegisterNetMessage<MsgChatMessage>();
            _netManager.RegisterNetMessage<MsgDeleteChatMessagesBy>();

            _configurationManager.OnValueChanged(CCVars.OocEnabled, OnOocEnabledChanged, true);
            _configurationManager.OnValueChanged(CCVars.AdminOocEnabled, OnAdminOocEnabledChanged, true);

            RegisterRateLimits();
        }

        private void OnOocEnabledChanged(bool val)
        {
            if (_oocEnabled == val) return;

            _oocEnabled = val;
            DispatchServerAnnouncement(Loc.GetString(val ? "chat-manager-ooc-chat-enabled-message" : "chat-manager-ooc-chat-disabled-message"));
        }

        private void OnAdminOocEnabledChanged(bool val)
        {
            if (_adminOocEnabled == val) return;

            _adminOocEnabled = val;
            DispatchServerAnnouncement(Loc.GetString(val ? "chat-manager-admin-ooc-chat-enabled-message" : "chat-manager-admin-ooc-chat-disabled-message"));
        }

        public void DeleteMessagesBy(ICommonSession player)
        {
            if (!_players.TryGetValue(player.UserId, out var user))
                return;

            var msg = new MsgDeleteChatMessagesBy { Key = user.Key, Entities = user.Entities };
            _netManager.ServerSendToAll(msg);
        }

        [return: NotNullIfNotNull(nameof(author))]
        public ChatUser? EnsurePlayer(NetUserId? author)
        {
            if (author == null)
                return null;

            ref var user = ref CollectionsMarshal.GetValueRefOrAddDefault(_players, author.Value, out var exists);
            if (!exists || user == null)
                user = new ChatUser(_players.Count);

            return user;
        }

        #region Server Announcements

        public void DispatchServerAnnouncement(string message, Color? colorOverride = null)
        {
            var wrappedMessage = Loc.GetString("chat-manager-server-wrap-message", ("message", FormattedMessage.EscapeText(message)));
            ChatMessageToAll(ChatChannel.Server, message, wrappedMessage, EntityUid.Invalid, hideChat: false, recordReplay: true, colorOverride: colorOverride);
            Logger.InfoS("SERVER", message);

            _adminLogger.Add(LogType.Chat, LogImpact.Low, $"Server announcement: {message}");
        }

        public void DispatchServerMessage(ICommonSession player, string message, bool suppressLog = false)
        {
            var wrappedMessage = Loc.GetString("chat-manager-server-wrap-message", ("message", FormattedMessage.EscapeText(message)));
            ChatMessageToOne(ChatChannel.Server, message, wrappedMessage, default, false, player.Channel);

            if (!suppressLog)
                _adminLogger.Add(LogType.Chat, LogImpact.Low, $"Server message to {player:Player}: {message}");
        }

        public void SendAdminAnnouncement(string message, AdminFlags? flagBlacklist, AdminFlags? flagWhitelist)
        {
            var clients = _adminManager.ActiveAdmins.Where(p =>
            {
                var adminData = _adminManager.GetAdminData(p);

                DebugTools.AssertNotNull(adminData);

                if (adminData == null)
                    return false;

                if (flagBlacklist != null && adminData.HasFlag(flagBlacklist.Value))
                    return false;

                return flagWhitelist == null || adminData.HasFlag(flagWhitelist.Value);

            }).Select(p => p.Channel);

            var wrappedMessage = Loc.GetString("chat-manager-send-admin-announcement-wrap-message",
                ("adminChannelName", Loc.GetString("chat-manager-admin-channel-name")), ("message", FormattedMessage.EscapeText(message)));

            ChatMessageToMany(ChatChannel.Admin, message, wrappedMessage, default, false, true, clients);
            _adminLogger.Add(LogType.Chat, LogImpact.Low, $"Admin announcement: {message}");
        }

        public void SendAdminAnnouncementMessage(ICommonSession player, string message, bool suppressLog = true)
        {
            var wrappedMessage = Loc.GetString("chat-manager-send-admin-announcement-wrap-message",
                ("adminChannelName", Loc.GetString("chat-manager-admin-channel-name")),
                ("message", FormattedMessage.EscapeText(message)));
            ChatMessageToOne(ChatChannel.Admin, message, wrappedMessage, default, false, player.Channel);
        }

        public void SendAdminAlert(string message)
        {
            var clients = _adminManager.ActiveAdmins.Select(p => p.Channel);

            var wrappedMessage = Loc.GetString("chat-manager-send-admin-announcement-wrap-message",
                ("adminChannelName", Loc.GetString("chat-manager-admin-channel-name")), ("message", FormattedMessage.EscapeText(message)));

            ChatMessageToMany(ChatChannel.AdminAlert, message, wrappedMessage, default, false, true, clients);
        }

        public void SendAdminAlert(EntityUid player, string message)
        {
            var mindSystem = _entityManager.System<SharedMindSystem>();
            if (!mindSystem.TryGetMind(player, out var mindId, out var mind))
            {
                SendAdminAlert(message);
                return;
            }

            var adminSystem = _entityManager.System<AdminSystem>();
            var antag = mind.UserId != null && (adminSystem.GetCachedPlayerInfo(mind.UserId.Value)?.Antag ?? false);

            SendAdminAlert($"{mind.Session?.Name}{(antag ? " (ANTAG)" : "")} {message}");
        }

        public void SendHookOOC(string sender, string message)
        {
            if (!_oocEnabled && _configurationManager.GetCVar(CCVars.DisablingOOCDisablesRelay))
            {
                return;
            }
            var wrappedMessage = Loc.GetString("chat-manager-send-hook-ooc-wrap-message", ("senderName", sender), ("message", FormattedMessage.EscapeText(message)));
            ChatMessageToAll(ChatChannel.OOC, message, wrappedMessage, source: EntityUid.Invalid, hideChat: false, recordReplay: true);
            _adminLogger.Add(LogType.Chat, LogImpact.Low, $"Hook OOC from {sender}: {message}");
        }

        #endregion

        #region Public OOC Chat API

        /// <summary>
        ///     Called for a player to attempt sending an OOC, out-of-game. message.
        /// </summary>
        /// <param name="player">The player sending the message.</param>
        /// <param name="message">The message.</param>
        /// <param name="type">The type of message.</param>
        public void TrySendOOCMessage(ICommonSession player, string message, OOCChatType type)
        {
            if (HandleRateLimit(player) != RateLimitStatus.Allowed)
                return;

            // Check if message exceeds the character limit
            if (message.Length > MaxMessageLength)
            {
                DispatchServerMessage(player, Loc.GetString("chat-manager-max-message-length-exceeded-message", ("limit", MaxMessageLength)));
                return;
            }

            switch (type)
            {
                case OOCChatType.OOC:
                    SendOOC(player, message);
                    break;
                case OOCChatType.Admin:
                    SendAdminChat(player, message);
                    break;
            }
        }

        #endregion

        #region Private API

        private void SendOOC(ICommonSession player, string message)
        {
            if (_adminManager.IsAdmin(player))
            {
                if (!_adminOocEnabled)
                {
                    return;
                }
            }
            else if (!_oocEnabled)
            {
                return;
            }

            Color? colorOverride = null;
            var wrappedMessage = Loc.GetString("chat-manager-send-ooc-wrap-message", ("playerName",player.Name), ("message", FormattedMessage.EscapeText(message)));
            if (_adminManager.HasAdminFlag(player, AdminFlags.Admin))
            {
                var prefs = _preferencesManager.GetPreferences(player.UserId);
                colorOverride = prefs.AdminOOCColor;
            }
            if (  _netConfigManager.GetClientCVar(player.Channel, CCVars.ShowOocPatronColor) && player.Channel.UserData.PatronTier is { } patron && PatronOocColors.TryGetValue(patron, out var patronColor))
            {
                wrappedMessage = Loc.GetString("chat-manager-send-ooc-patron-wrap-message", ("patronColor", patronColor),("playerName", player.Name), ("message", FormattedMessage.EscapeText(message)));
            }

            //TODO: player.Name color, this will need to change the structure of the MsgChatMessage
            ChatMessageToAll(ChatChannel.OOC, message, wrappedMessage, EntityUid.Invalid, hideChat: false, recordReplay: true, colorOverride: colorOverride, author: player.UserId);
            _mommiLink.SendOOCMessage(player.Name, message.Replace("@", "\\@").Replace("<", "\\<")); // @ and < are both problematic for discord
            _adminLogger.Add(LogType.Chat, LogImpact.Low, $"OOC from {player:Player}: {message}");
        }

        private void SendAdminChat(ICommonSession player, string message)
        {
            if (!_adminManager.IsAdmin(player))
            {
                _adminLogger.Add(LogType.Chat, LogImpact.Extreme, $"{player:Player} attempted to send admin message but was not admin");
                return;
            }

            var clients = _adminManager.ActiveAdmins.Select(p => p.Channel);
            var wrappedMessage = Loc.GetString("chat-manager-send-admin-chat-wrap-message",
                                            ("adminChannelName", Loc.GetString("chat-manager-admin-channel-name")),
                                            ("playerName", player.Name), ("message", FormattedMessage.EscapeText(message)));

            foreach (var client in clients)
            {
                var isSource = client != player.Channel;
                ChatMessageToOne(ChatChannel.AdminChat,
                    message,
                    wrappedMessage,
                    default,
                    false,
                    client,
                    audioPath: isSource ? _netConfigManager.GetClientCVar(client, CCVars.AdminChatSoundPath) : default,
                    audioVolume: isSource ? _netConfigManager.GetClientCVar(client, CCVars.AdminChatSoundVolume) : default,
                    author: player.UserId);
            }

            _adminLogger.Add(LogType.Chat, $"Admin chat from {player:Player}: {message}");
        }

        #endregion

        #region Utility

        public void ChatMessageToOne(ChatChannel channel, string message, string wrappedMessage, EntityUid source, bool hideChat, INetChannel client, Color? colorOverride = null, bool recordReplay = false, string? audioPath = null, float audioVolume = 0, NetUserId? author = null)
        {
            var user = author == null ? null : EnsurePlayer(author);
            var netSource = _entityManager.GetNetEntity(source);
            user?.AddEntity(netSource);

            var msg = new ChatMessage(channel, message, wrappedMessage, netSource, user?.Key, hideChat, colorOverride, audioPath, audioVolume);
            _netManager.ServerSendMessage(new MsgChatMessage() { Message = msg }, client);

            if (!recordReplay)
                return;

            if ((channel & ChatChannel.AdminRelated) == 0 ||
                _configurationManager.GetCVar(CCVars.ReplayRecordAdminChat))
            {
                _replay.RecordServerMessage(msg);
            }
        }

        public void ChatMessageToMany(ChatChannel channel, string message, string wrappedMessage, EntityUid source, bool hideChat, bool recordReplay, IEnumerable<INetChannel> clients, Color? colorOverride = null, string? audioPath = null, float audioVolume = 0, NetUserId? author = null)
            => ChatMessageToMany(channel, message, wrappedMessage, source, hideChat, recordReplay, clients.ToList(), colorOverride, audioPath, audioVolume, author);

        public void ChatMessageToMany(ChatChannel channel, string message, string wrappedMessage, EntityUid source, bool hideChat, bool recordReplay, List<INetChannel> clients, Color? colorOverride = null, string? audioPath = null, float audioVolume = 0, NetUserId? author = null)
        {
            var user = author == null ? null : EnsurePlayer(author);
            var netSource = _entityManager.GetNetEntity(source);
            user?.AddEntity(netSource);

            var msg = new ChatMessage(channel, message, wrappedMessage, netSource, user?.Key, hideChat, colorOverride, audioPath, audioVolume);
            _netManager.ServerSendToMany(new MsgChatMessage() { Message = msg }, clients);

            if (!recordReplay)
                return;

            if ((channel & ChatChannel.AdminRelated) == 0 ||
                _configurationManager.GetCVar(CCVars.ReplayRecordAdminChat))
            {
                _replay.RecordServerMessage(msg);
            }
        }

        public void ChatMessageToManyFiltered(Filter filter, ChatChannel channel, string message, string wrappedMessage, EntityUid source,
            bool hideChat, bool recordReplay, Color? colorOverride = null, string? audioPath = null, float audioVolume = 0)
        {
            if (!recordReplay && !filter.Recipients.Any())
                return;

            var clients = new List<INetChannel>();
            foreach (var recipient in filter.Recipients)
            {
                clients.Add(recipient.Channel);
            }

            ChatMessageToMany(channel, message, wrappedMessage, source, hideChat, recordReplay, clients, colorOverride, audioPath, audioVolume);
        }

        public void ChatMessageToAll(ChatChannel channel, string message, string wrappedMessage, EntityUid source, bool hideChat, bool recordReplay, Color? colorOverride = null, string? audioPath = null, float audioVolume = 0, NetUserId? author = null)
        {
            var user = author == null ? null : EnsurePlayer(author);
            var netSource = _entityManager.GetNetEntity(source);
            user?.AddEntity(netSource);

            var msg = new ChatMessage(channel, message, wrappedMessage, netSource, user?.Key, hideChat, colorOverride, audioPath, audioVolume);
            _netManager.ServerSendToAll(new MsgChatMessage() { Message = msg });

            if (!recordReplay)
                return;

            if ((channel & ChatChannel.AdminRelated) == 0 ||
                _configurationManager.GetCVar(CCVars.ReplayRecordAdminChat))
            {
                _replay.RecordServerMessage(msg);
            }
        }

        public bool MessageCharacterLimit(ICommonSession? player, string message)
        {
            var isOverLength = false;

            // Non-players don't need to be checked.
            if (player == null)
                return false;

            // Check if message exceeds the character limit if the sender is a player
            if (message.Length > MaxMessageLength)
            {
                var feedback = Loc.GetString("chat-manager-max-message-length-exceeded-message", ("limit", MaxMessageLength));

                DispatchServerMessage(player, feedback);

                isOverLength = true;
            }

            return isOverLength;
        }

        #endregion
    }

    public enum OOCChatType : byte
    {
        OOC,
        Admin
    }
}