using System;
using MinecraftClient.Mcp;
using MinecraftClient.Scripting;
using Tomlet.Attributes;

namespace MinecraftClient.ChatBots
{
    public class McpServer : ChatBot
    {
        public static Configs Config = new();

        [TomlDoNotInlineObject]
        public class Configs
        {
            [NonSerialized]
            private const string BotName = "McpServer";

            [TomlInlineComment("$ChatBot.McpServer.Enabled$")]
            public bool Enabled = false;

            [TomlPrecedingComment("$ChatBot.McpServer.Transport$")]
            public MccMcpTransportConfig Transport = new();

            [TomlPrecedingComment("$ChatBot.McpServer.Capabilities$")]
            public MccMcpCapabilityToggles Capabilities = new();

            public void OnSettingUpdate()
            {
                Transport ??= new MccMcpTransportConfig();
                Capabilities ??= new MccMcpCapabilityToggles();

                if (Transport.Port is < 1 or > 65535)
                    Transport.Port = 33333;

                if (string.IsNullOrWhiteSpace(Transport.BindHost))
                    Transport.BindHost = "127.0.0.1";

                if (string.IsNullOrWhiteSpace(Transport.Route))
                    Transport.Route = "/mcp";

                if (!Transport.Route.StartsWith('/'))
                    Transport.Route = "/" + Transport.Route;

                if (string.IsNullOrWhiteSpace(Transport.AuthTokenEnvVar))
                    Transport.AuthTokenEnvVar = "MCC_MCP_AUTH_TOKEN";
            }
        }

        private MccEmbeddedMcpHost? host;

        public override void Initialize()
        {
            Config.OnSettingUpdate();
        }

        public override void AfterGameJoined()
        {
            if (!Config.Enabled)
                return;

            MccMcpChatHistoryStore.Clear();

            MccMcpConfig mcpConfig = new()
            {
                Enabled = Config.Enabled,
                Transport = Config.Transport,
                Capabilities = Config.Capabilities
            };

            host ??= new MccEmbeddedMcpHost(mcpConfig, new MccMcpCapabilities(() => Config.Capabilities));

            if (host.IsRunning)
                return;

            LogToConsole(Translations.bot_mcpserver_starting);
            if (!host.Start(out string? error))
            {
                if (error == "missing_auth_token")
                    LogToConsole(string.Format(Translations.bot_mcpserver_missing_auth_token, Config.Transport.AuthTokenEnvVar));
                LogToConsole(string.Format(Translations.bot_mcpserver_start_failed, error ?? "unknown"));
                return;
            }

            LogToConsole(string.Format(Translations.bot_mcpserver_started, host.Endpoint));
        }

        public override bool OnDisconnect(DisconnectReason reason, string message)
        {
            StopHost();
            MccMcpChatHistoryStore.Clear();
            return false;
        }

        public override void OnUnload()
        {
            StopHost();
            MccMcpChatHistoryStore.Clear();
        }

        public override void GetText(string text, string? json)
        {
            string clean = GetVerbatim(text);
            if (string.IsNullOrWhiteSpace(clean))
                return;

            string kind = "system";
            string? sender = null;
            string? message = null;

            string parsedMessage = string.Empty;
            string parsedSender = string.Empty;
            if (IsPrivateMessage(clean, ref parsedMessage, ref parsedSender))
            {
                kind = "private";
                sender = parsedSender;
                message = parsedMessage;
            }
            else if (IsChatMessage(clean, ref parsedMessage, ref parsedSender))
            {
                kind = "chat";
                sender = parsedSender;
                message = parsedMessage;
            }

            MccMcpChatHistoryStore.Add(new MccMcpChatHistoryEntry
            {
                TimestampUtc = DateTimeOffset.UtcNow,
                Kind = kind,
                Text = clean,
                Sender = sender,
                Message = message,
                Json = json
            });
        }

        private void StopHost()
        {
            if (host is null || !host.IsRunning)
                return;

            if (host.Stop(out string? error))
                LogToConsole(Translations.bot_mcpserver_stopped);
            else
                LogToConsole(string.Format(Translations.bot_mcpserver_stop_failed, error ?? "unknown"));
        }
    }
}