# All files / src index.ts

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     #!/usr/bin/env node
    /**
     * European Parliament MCP Server
     *
     * Model Context Protocol server providing access to European Parliament open data.
     *
     * **Intelligence Perspective:** Serves as the primary OSINT platform for EU parliamentary
     * intelligence—enabling MEP profiling, voting pattern analysis, coalition detection,
     * legislative monitoring, and political risk assessment through structured MCP tools.
     *
     * **Business Perspective:** Core product offering structured access to EU parliamentary
     * data via MCP protocol—targeting AI developers, civic tech platforms, journalists,
     * researchers, and enterprise government affairs teams.
     *
     * **Marketing Perspective:** First MCP server for European Parliament data—positioned
     * at the intersection of AI/LLM tooling and democratic transparency, targeting the
     * growing MCP ecosystem and EU civic tech market.
     *
     * @see https://data.europarl.europa.eu/
     * @see https://spec.modelcontextprotocol.io/
     */

    import { Server } from '@modelcontextprotocol/sdk/server/index.js';
    import { StdioServerTransport } from '@modelcontextprotocol/sdk/server/stdio.js';
    import {
      CallToolRequestSchema,
      ListToolsRequestSchema,
      ListPromptsRequestSchema,
      GetPromptRequestSchema,
      ListResourceTemplatesRequestSchema,
      ReadResourceRequestSchema,
    } from '@modelcontextprotocol/sdk/types.js';
    import { fileURLToPath } from 'url';
    import { resolve } from 'path';
    import { realpathSync } from 'fs';

    import { getToolMetadataArray, dispatchToolCall } from './server/toolRegistry.js';
    import { showHelp, showVersion, showHealth, parseCLIArgs } from './server/cli.js';
    import { handleToolError } from './tools/shared/errorHandler.js';
    import { SERVER_NAME, SERVER_VERSION } from './config.js';
    import { getPromptMetadataArray, handleGetPrompt } from './prompts/index.js';
    import { getResourceTemplateArray, handleReadResource } from './resources/index.js';
    /** Re-export all public types, branded identifiers, and error classes */
    export type * from './types/index.js';
    /** Re-export all runtime type guards, factory functions, and error utilities */
    export * from './types/index.js';
    /** Re-export tool registry for consumers */
    export { getToolMetadataArray } from './server/toolRegistry.js';
    /** Re-export CLI utilities */
    export { sanitizeUrl } from './server/cli.js';
    /** Re-export server types */
    export type { ToolHandler, ToolMetadata, ToolCategory, CLIOptions, ToolResult } from './server/types.js';
    /** Re-export DI token registry */
    export type { DIToken } from './di/tokens.js';
    /** Re-export DI container and default factory for consumers */
    export { createDefaultContainer } from './di/container.js';
    /** Re-export metric names and key type for consumers using the metrics service */
    export { MetricName } from './services/MetricsService.js';
    export type { MetricKey } from './services/MetricsService.js';
    /** Re-export performance thresholds, timeout defaults, and related config types for consumers */
    export { DEFAULT_PERFORMANCE_THRESHOLDS } from './utils/performance.js';
    export type { PerformanceThresholds } from './utils/performance.js';
    export { DEFAULT_TIMEOUTS } from './utils/timeout.js';
    export type { TimeoutConfig } from './utils/timeout.js';
    export type { RateLimiterConfig, RateLimiterStatus } from './utils/rateLimiter.js';
    export type { AuditEvent, AuditLogEntry, LogLevel } from './utils/auditLogger.js';
    /** Re-export audit sink public API for consumer-configurable pluggable sinks */
    export type {
      AuditFilter,
      AuditLoggerOptions,
      AuditSink,
      AuthToken,
      FileAuditSinkOptions,
    } from './utils/auditLogger.js';
    export {
      DEFAULT_SENSITIVE_KEYS,
      FileAuditSink,
      MemoryAuditSink,
      RetentionPolicy,
      sanitizeParams,
      StderrAuditSink,
      StructuredJsonSink,
    } from './utils/auditLogger.js';
    /** Re-export prompt argument schemas for integration tests and client validation */
    export {
      MepBriefingArgsSchema,
      CoalitionAnalysisArgsSchema,
      LegislativeTrackingArgsSchema,
      PoliticalGroupComparisonArgsSchema,
      CommitteeActivityArgsSchema,
      VotingPatternArgsSchema,
      CountryDelegationArgsSchema,
    } from './prompts/index.js';

    /** @internal Server name constant */
    export { SERVER_NAME, SERVER_VERSION } from './config.js';

    /**
     * Main MCP Server class for European Parliament data access
     *
     * Implements the Model Context Protocol (MCP) to provide AI assistants,
     * IDEs, and other MCP clients with structured access to European Parliament
     * open data, including information about MEPs, plenary sessions, committees,
     * legislative documents, and parliamentary questions.
     *
     * **Features:**
     * - MCP protocol implementation with tools, resources, and prompts
     * - Type-safe TypeScript implementation with strict mode
     * - GDPR-compliant data handling
     * - Rate limiting and security controls
     * - Comprehensive error handling
     *
     * **Data Sources:**
     * - European Parliament Open Data Portal (https://data.europarl.europa.eu/)
     * - API v2: https://data.europarl.europa.eu/api/v2/
     *
     * @example
     * ```typescript
     * const server = new EuropeanParliamentMCPServer();
     * await server.start();
     * ```
     *
     * @see https://spec.modelcontextprotocol.io/ - MCP specification
     * @see https://data.europarl.europa.eu/ - EP Open Data Portal
     * @see https://github.com/Hack23/ISMS-PUBLIC - ISMS compliance policies
     */
    export class EuropeanParliamentMCPServer {
      // eslint-disable-next-line @typescript-eslint/no-deprecated
      private readonly server: Server;

      constructor() {
        // eslint-disable-next-line @typescript-eslint/no-deprecated
        this.server = new Server(
          {
            name: SERVER_NAME,
            version: SERVER_VERSION,
          },
          {
            capabilities: {
              tools: {},
              resources: {},
              prompts: {},
            },
          }
        );

        this.setupHandlers();
      }

      /**
       * Set up MCP protocol handlers
       *
       * Registers handlers for:
       * - Tool listing: Returns available tools with schemas
       * - Tool execution: Routes tool calls to appropriate handlers
       *
       * **Security:**
       * - All inputs validated before processing
       * - Rate limiting applied per client
       * - GDPR compliance enforced
       * - Audit logging for all data access
       *
       * @throws {Error} If handler registration fails
       *
       * @internal
       */
      private setupHandlers(): void {
        this.server.setRequestHandler(ListToolsRequestSchema, () => {
          return Promise.resolve({
            tools: getToolMetadataArray(),
          });
        });

        this.server.setRequestHandler(CallToolRequestSchema, async (request) => {
          const { name, arguments: args } = request.params;

          try {
            return await this.dispatchToolCall(name, args);
          } catch (error: unknown) {
            console.error(`[ERROR] Tool ${name} failed:`, error);
            return handleToolError(error, name);
          }
        });

        this.server.setRequestHandler(ListPromptsRequestSchema, () => {
          return Promise.resolve({
            prompts: getPromptMetadataArray(),
          });
        });

        this.server.setRequestHandler(GetPromptRequestSchema, (request) => {
          const { name, arguments: args } = request.params;

          try {
            return Promise.resolve(handleGetPrompt(name, args));
          } catch (error: unknown) {
            console.error(`[ERROR] Prompt ${name} failed:`, error);
            Eif (error instanceof Error) {
              throw error;
            }
            throw new Error(`Prompt execution failed: ${String(error)}`);
          }
        });

        this.server.setRequestHandler(ListResourceTemplatesRequestSchema, () => {
          return Promise.resolve({
            resourceTemplates: getResourceTemplateArray(),
          });
        });

        this.server.setRequestHandler(ReadResourceRequestSchema, async (request) => {
          const { uri } = request.params;

          try {
            return await handleReadResource(uri);
          } catch (error: unknown) {
            console.error(`[ERROR] Resource ${uri} failed:`, error);
            Eif (error instanceof Error) {
              throw error;
            }
            throw new Error(`Resource read failed: ${String(error)}`);
          }
        });
      }

      /**
       * Dispatch tool calls to appropriate handlers
       *
       * @internal
       * @param name - Tool name
       * @param args - Tool arguments
       * @returns Tool execution result
       */
      private async dispatchToolCall(
        name: string,
        args: unknown
      ): Promise<{ content: { type: string; text: string }[] }> {
        return await dispatchToolCall(name, args);
      }

      /**
       * Start the MCP server
       *
       * Initializes the server with stdio transport and begins listening for
       * MCP protocol messages. The server communicates via standard input/output
       * following the MCP specification.
       *
       * **Lifecycle:**
       * 1. Create stdio transport
       * 2. Connect server to transport
       * 3. Log startup message to stderr
       * 4. Begin handling MCP requests
       *
       * @returns Promise that resolves when server is started
       *
       * @throws {Error} If server initialization fails
       *
       * @example
       * ```typescript
       * const server = new EuropeanParliamentMCPServer();
       * await server.start();
       * // Server now listening on stdio
       * ```
       *
       * @see https://spec.modelcontextprotocol.io/specification/architecture/
       */
      async start(): Promise<void> {
        const transport = new StdioServerTransport();

        try {
          await this.server.connect(transport);
        } catch (connectError: unknown) {
          console.error('[FATAL] Failed to connect MCP transport:', connectError);
          throw connectError instanceof Error
            ? connectError
            : new Error('Failed to connect MCP transport', { cause: connectError });
        }

        const tools = getToolMetadataArray();
        const coreToolCount = tools.filter(t => t.category === 'core').length;
        const nonCoreToolCount = tools.length - coreToolCount;
        const prompts = getPromptMetadataArray();
        const resourceTemplates = getResourceTemplateArray();

        console.error(`${SERVER_NAME} v${SERVER_VERSION} started`);
        console.error('Server ready to handle requests');
        console.error(`Available tools: ${String(tools.length)} (${String(coreToolCount)} core + ${String(nonCoreToolCount)} additional)`);
        console.error(`Available prompts: ${String(prompts.length)}`);
        console.error(`Available resource templates: ${String(resourceTemplates.length)}`);
      }
    }

    const isMainModule =
      process.argv[1] !== undefined &&
      realpathSync(resolve(fileURLToPath(import.meta.url))) === realpathSync(resolve(process.argv[1]));

    Iif (isMainModule) {
      const cliArgs = process.argv.slice(2);
      const opts = parseCLIArgs(cliArgs);

      if (opts.help === true) {
        showHelp();
        process.exit(0);
      }

      if (opts.version === true) {
        showVersion();
        process.exit(0);
      }

      if (opts.health === true) {
        showHealth();
        process.exit(0);
      }

      const server = new EuropeanParliamentMCPServer();

      function handleShutdownSignal(signal: string): void {
        console.error(`[${SERVER_NAME}] Received ${signal} — exiting`);
        process.exit(0);
      }

      process.once('SIGTERM', () => { handleShutdownSignal('SIGTERM'); });
      process.once('SIGINT', () => { handleShutdownSignal('SIGINT'); });

      server.start().catch((error: unknown) => {
        console.error('[FATAL] Server startup failed:', error);
        process.exit(1);
      });
    }