namespace AxCopilot.Services.Agent;

/// <summary>
/// 사용 가능한 에이전트 도구/스킬을 관리하는 레지스트리.
/// 도구 목록을 LLM function calling에 전달하고, 이름으로 도구를 찾습니다.
/// </summary>
public class ToolRegistry : IDisposable
{
    private readonly Dictionary<string, IAgentTool> _tools = new(StringComparer.OrdinalIgnoreCase);
    private readonly List<IDisposable> _ownedResources = new();
    private readonly Dictionary<string, McpClientService> _mcpClients = new(StringComparer.OrdinalIgnoreCase);

    /// <summary>등록된 모든 도구 목록.</summary>
    public IReadOnlyCollection<IAgentTool> All => _tools.Values;

    /// <summary>도구를 이름으로 찾습니다.</summary>
    public IAgentTool? Get(string name) =>
        _tools.TryGetValue(AgentToolCatalog.Canonicalize(name), out var tool) ? tool : null;

    /// <summary>도구를 등록합니다.</summary>
    public void Register(IAgentTool tool) => _tools[tool.Name] = tool;

    public IReadOnlyCollection<McpClientService> GetMcpClients() => _mcpClients.Values.ToList().AsReadOnly();

    public async Task<int> RegisterMcpToolsAsync(IEnumerable<Models.McpServerEntry>? servers, CancellationToken ct = default)
    {
        if (servers == null) return 0;

        var registered = 0;
        foreach (var server in servers)
        {
            if (server == null || !server.Enabled) continue;

            if (!string.Equals(server.Transport, "stdio", StringComparison.OrdinalIgnoreCase))
            {
                LogService.Warn($"MCP '{server.Name}': unsupported transport '{server.Transport}'.");
                continue;
            }

            var client = new McpClientService(server);
            if (!await client.ConnectAsync(ct).ConfigureAwait(false))
            {
                client.Dispose();
                continue;
            }

            _ownedResources.Add(client);
            _mcpClients[server.Name] = client;
            foreach (var def in client.Tools)
            {
                Register(new McpTool(client, def));
                registered++;
            }
        }

        McpSkillCatalog.RefreshFromClients(_mcpClients.Values);
        return registered;
    }

    /// <summary>비활성 도구를 제외한 활성 도구 목록을 반환합니다.</summary>
    public IReadOnlyCollection<IAgentTool> GetActiveTools(IEnumerable<string>? disabledNames = null)
    {
        if (disabledNames == null) return All;
        var disabled = new HashSet<string>(AgentToolCatalog.CanonicalizeMany(disabledNames), StringComparer.OrdinalIgnoreCase);
        if (disabled.Count == 0) return All;
        return OrderToolsForExposure(_tools.Values.Where(t => !disabled.Contains(t.Name)))
            .ToList()
            .AsReadOnly();
    }

    /// <summary>비활성 도구를 제외하고 현재 탭에 해당하는 도구만 반환합니다.</summary>
    public IReadOnlyCollection<IAgentTool> GetActiveToolsForTab(string activeTab, IEnumerable<string>? disabledNames = null)
    {
        var disabled = disabledNames != null
            ? new HashSet<string>(AgentToolCatalog.CanonicalizeMany(disabledNames), StringComparer.OrdinalIgnoreCase)
            : null;

        return OrderToolsForExposure(_tools.Values.Where(t =>
        {
            if (disabled != null && disabled.Contains(t.Name)) return false;
            return IsToolAvailableForTab(t, activeTab);
        })).ToList().AsReadOnly();
    }

    private static IEnumerable<IAgentTool> OrderToolsForExposure(IEnumerable<IAgentTool> tools)
    {
        return tools
            .OrderBy(GetToolExposureBucket)
            .ThenBy(t => t.Name, StringComparer.OrdinalIgnoreCase);
    }

    private static int GetToolExposureBucket(IAgentTool tool)
    {
        return AgentToolCatalog.GetExposureBucket(tool.Name);
    }

    /// <summary>도구가 해당 탭에서 사용 가능한지 확인합니다.</summary>
    private static bool IsToolAvailableForTab(IAgentTool tool, string activeTab)
    {
        var category = ResolveTabCategory(tool);
        if (string.IsNullOrEmpty(category)) return true; // null = 모든 탭
        // 쉼표 구분 복수 탭: "Cowork,Code"
        foreach (var part in category.Split(',', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries))
        {
            if (string.Equals(part, activeTab, StringComparison.OrdinalIgnoreCase))
                return true;
        }
        return false;
    }

    /// <summary>
    /// 도구별 탭 카테고리 오버라이드.
    /// IAgentTool.TabCategory가 null인 도구는 이 맵을 참조합니다.
    /// 키: 도구 이름, 값: 허용 탭 (쉼표 구분). 맵에 없으면 = 모든 탭.
    /// </summary>
    /// <summary>도구의 실질 탭 카테고리를 결정합니다 (IAgentTool.TabCategory → 오버라이드 맵 순).</summary>
    private static string? ResolveTabCategory(IAgentTool tool)
    {
        // 도구 자체에 TabCategory가 명시되어 있으면 우선
        if (!string.IsNullOrEmpty(tool.TabCategory))
            return tool.TabCategory;

        return AgentToolCatalog.GetTabCategory(tool.Name);
    }

    /// <summary>IDisposable 도구를 모두 해제합니다.</summary>
    public void Dispose()
    {
        foreach (var tool in _tools.Values)
        {
            if (tool is IDisposable disposable)
                disposable.Dispose();
        }
        foreach (var resource in _ownedResources)
            resource.Dispose();
        _ownedResources.Clear();
        _mcpClients.Clear();
        _tools.Clear();
    }

    /// <summary>기본 도구 + 내장 스킬을 모두 등록한 레지스트리를 생성합니다.</summary>
    public static ToolRegistry CreateDefault()
    {
        var registry = new ToolRegistry();

        // 기본 도구 (파일/검색/프로세스)
        registry.Register(new FileReadTool());
        registry.Register(new FileWriteTool());
        registry.Register(new FileEditTool());
        registry.Register(new GlobTool());
        registry.Register(new GrepTool());
        registry.Register(new ProcessTool());
        registry.Register(new FolderMapTool());
        registry.Register(new DocumentReaderTool());

        // 내장 스킬 (문서 생성)
        registry.Register(new ExcelSkill());
        registry.Register(new DocxSkill());
        registry.Register(new CsvSkill());
        registry.Register(new MarkdownSkill());
        registry.Register(new HtmlSkill());
        registry.Register(new ChartSkill());
        registry.Register(new BatchSkill());
        registry.Register(new PptxSkill());

        // 멀티패스 문서 엔진
        registry.Register(new DocumentPlannerTool());
        registry.Register(new DocumentAssemblerTool());

        // 문서 품질 검증 & 포맷 변환
        registry.Register(new DocumentReviewTool());
        registry.Register(new FormatConvertTool());

        // Code 탭: 개발 환경 감지 & 빌드/테스트 & Git
        registry.Register(new DevEnvDetectTool());
        registry.Register(new BuildRunTool());
        registry.Register(new GitTool());
        registry.Register(new LspTool());
        registry.Register(new SubAgentTool());
        registry.Register(new SpawnAgentsTool());
        registry.Register(new WaitAgentsTool());
        registry.Register(new CodeSearchTool());
        registry.Register(new TestLoopTool());
        registry.Register(new ToolSearchTool(() => registry.All));

        // 코드 리뷰 + 프로젝트 규칙
        registry.Register(new CodeReviewTool());
        registry.Register(new ProjectRuleTool());

        // 스킬 시스템
        registry.Register(new SkillManagerTool());

        // 에이전트 메모리
        registry.Register(new MemoryTool());

        // 데이터 처리 + 시스템 유틸리티
        registry.Register(new JsonTool());
        registry.Register(new RegexTool());
        registry.Register(new DiffTool());
        registry.Register(new ClipboardTool());
        registry.Register(new NotifyTool());
        registry.Register(new EnvTool());
        registry.Register(new ZipTool());
        registry.Register(new HttpTool());
        registry.Register(new SqlTool());
        registry.Register(new Base64Tool());
        registry.Register(new HashTool());
        registry.Register(new DateTimeTool());

        // 코드 품질
        registry.Register(new SnippetRunnerTool());

        // 데이터 분석 + 문서 자동화
        registry.Register(new DataPivotTool());
        registry.Register(new TemplateRenderTool());
        registry.Register(new TextSummarizeTool());

        // 파일 모니터링 + 이미지 분석
        registry.Register(new FileWatchTool());
        registry.Register(new ImageAnalyzeTool());

        // 파일 관리 + 메타데이터 + 멀티리드
        registry.Register(new FileManageTool());
        registry.Register(new FileInfoTool());
        registry.Register(new MultiReadTool());

        // 사용자 질문
        registry.Register(new UserAskTool());

        // MCP 리소스
        registry.Register(new McpListResourcesTool(() => registry.GetMcpClients()));
        registry.Register(new McpReadResourceTool(() => registry.GetMcpClients()));

        // 외부 열기 + 수학 + XML + 인코딩
        registry.Register(new OpenExternalTool());
        registry.Register(new MathTool());
        registry.Register(new XmlTool());
        registry.Register(new EncodingTool());

        // 태스크 추적
        registry.Register(new TaskTrackerTool());
        registry.Register(new TodoWriteTool());
        registry.Register(new TaskCreateTool());
        registry.Register(new TaskGetTool());
        registry.Register(new TaskListTool());
        registry.Register(new TaskUpdateTool());
        registry.Register(new TaskStopTool());
        registry.Register(new TaskOutputTool());
        registry.Register(new EnterWorktreeTool());
        registry.Register(new ExitWorktreeTool());
        registry.Register(new TeamCreateTool());
        registry.Register(new TeamDeleteTool());
        registry.Register(new CronCreateTool());
        registry.Register(new CronDeleteTool());
        registry.Register(new CronListTool());

        // 워크플로우 도구
        registry.Register(new SuggestActionsTool());
        registry.Register(new DiffPreviewTool());
        registry.Register(new CheckpointTool());
        registry.Register(new PlaybookTool());

        return registry;
    }
}