# All files / src/tools getMEPs.ts

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     /**
     * MCP Tool: get_meps
     *
     * Retrieve Members of European Parliament with filtering options
     *
     * **Intelligence Perspective:** Foundation for MEP profiling, political group cohesion analysis,
     * national delegation mapping, and cross-party alliance detection via OSINT methodologies.
     *
     * **Business Perspective:** Core data product for B2G/B2B customers requiring MEP contact
     * databases, political risk assessments, and stakeholder mapping services.
     *
     * **Marketing Perspective:** Primary showcase tool demonstrating API value proposition
     * to journalists, researchers, and civic tech developers seeking structured MEP data.
     *
     * ISMS Policy: SC-002 (Input Validation), AC-003 (Least Privilege)
     */

    import { GetMEPsSchema, MEPSchema, PaginatedResponseSchema } from '../schemas/europeanParliament.js';
    import { epClient } from '../clients/europeanParliamentClient.js';
    import { buildToolResponse } from './shared/responseBuilder.js';
    import { buildApiParams } from './shared/paramBuilder.js';
    import { ToolError } from './shared/errors.js';
    import { z } from 'zod';
    import type { ToolResult } from './shared/types.js';

    /**
     * Handles the get_meps MCP tool request.
     *
     * Retrieves Members of European Parliament with optional filtering by country, political
     * group, committee, and active status. Results are paginated and GDPR-compliant.
     *
     * **Intelligence Use Cases:** Filter by country for national delegation analysis, by group for
     * cohesion studies, by committee for policy domain expertise mapping.
     *
     * **Business Use Cases:** Power stakeholder mapping products, political risk dashboards,
     * and MEP engagement tracking for corporate affairs teams.
     *
     * **Marketing Use Cases:** Demo-ready endpoint for showcasing EP data access to potential
     * API consumers, journalists, and civic tech developers.
     *
     * @param args - Raw tool arguments, validated against {@link GetMEPsSchema}
     * @returns MCP tool result containing a paginated list of MEP records with name, country,
     *   political group, committee memberships, and contact information
     * @throws {ToolError} With `operation: 'validateInput'` if `args` fails Zod schema validation
     *   (e.g., country code not 2 uppercase letters, limit out of range 1–100)
     * @throws {ToolError} With `operation: 'validateOutput'` if the EP API response does not match
     *   the expected schema shape
     * @throws {ToolError} With `operation: 'fetchData'` if the European Parliament API is
     *   unreachable or returns an error response
     *
     * @example
     * ```typescript
     * const result = await handleGetMEPs({ country: 'SE', limit: 10 });
     * // Returns up to 10 Swedish MEPs with group and committee details
     * ```
     *
     * @example
     * ```typescript
     * // Get active EPP group members
     * const result = await handleGetMEPs({ group: "EPP", active: true, limit: 50 });
     * ```
     *
     * @security - Input is validated with Zod before any API call.
     * - Errors are sanitized to avoid exposing internal implementation details.
     * - Personal data in responses is minimised per GDPR Article 5(1)(c).
     * - Personal data access is audit-logged per GDPR Article 30.
     * - All requests are rate-limited and audit-logged per ISMS Policy AU-002.
     * - ISMS Policy: SC-002 (Input Validation), AC-003 (Least Privilege)
     * @since 0.8.0
     * @see {@link getMEPsToolMetadata} for MCP schema registration
     * @see {@link handleGetMEPDetails} for retrieving full details of a single MEP
     */
    export async function handleGetMEPs(
      args: unknown
    ): Promise<ToolResult> {
      let params: ReturnType<typeof GetMEPsSchema.parse>;
      try {
        params = GetMEPsSchema.parse(args);
      } catch (error: unknown) {
        Eif (error instanceof z.ZodError) {
          const fieldErrors = error.issues.map(e => `${e.path.join('.')}: ${e.message}`).join('; ');
          throw new ToolError({
            toolName: 'get_meps',
            operation: 'validateInput',
            message: `Invalid parameters: ${fieldErrors}`,
            isRetryable: false,
            cause: error,
          });
        }
        throw error;
      }

      try {
        const apiParams = {
          active: params.active,
          limit: params.limit,
          offset: params.offset,
          ...buildApiParams(params, [
            { from: 'country', to: 'country' },
            { from: 'group', to: 'group' },
            { from: 'committee', to: 'committee' },
          ]),
        };

        const result = await epClient.getMEPs(apiParams);

        const outputSchema = PaginatedResponseSchema(MEPSchema);
        const validated = outputSchema.parse(result);

        return buildToolResponse(validated);
      } catch (error: unknown) {
        Iif (error instanceof z.ZodError) {
          const fieldErrors = error.issues.map(e => `${e.path.join('.')}: ${e.message}`).join('; ');
          throw new ToolError({
            toolName: 'get_meps',
            operation: 'validateOutput',
            message: `Unexpected EP API response format: ${fieldErrors}`,
            isRetryable: false,
            cause: error,
          });
        }
        throw new ToolError({
          toolName: 'get_meps',
          operation: 'fetchData',
          message: 'Failed to retrieve MEPs',
          isRetryable: true,
          cause: error,
        });
      }
    }

    /**
     * Tool metadata for MCP registration
     */
    export const getMEPsToolMetadata = {
      name: 'get_meps',
      description: 'Retrieve Members of European Parliament with optional filters (country, political group, committee, active status). Returns paginated results with MEP details including name, country, political group, committees, and contact information.',
      inputSchema: {
        type: 'object' as const,
        properties: {
          country: {
            type: 'string',
            description: 'ISO 3166-1 alpha-2 country code (e.g., "SE" for Sweden)',
            pattern: '^[A-Z]{2}$',
            minLength: 2,
            maxLength: 2
          },
          group: {
            type: 'string',
            description: 'Political group identifier (e.g., "EPP", "S&D", "Greens/EFA")',
            minLength: 1,
            maxLength: 50
          },
          committee: {
            type: 'string',
            description: 'Committee identifier (e.g., "ENVI", "AGRI")',
            minLength: 1,
            maxLength: 100
          },
          active: {
            type: 'boolean',
            description: 'Filter by active status',
            default: true
          },
          limit: {
            type: 'number',
            description: 'Maximum number of results to return (1-100)',
            minimum: 1,
            maximum: 100,
            default: 50
          },
          offset: {
            type: 'number',
            description: 'Pagination offset',
            minimum: 0,
            default: 0
          }
        }
      }
    };