# All files / src/clients/ep documentClient.ts

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     /**
     * @fileoverview Document sub-client for European Parliament API
     *
     * Handles all document-related API calls: plenary documents,
     * committee documents, plenary session documents, external documents,
     * and the generic documents search endpoint.
     *
     * @module clients/ep/documentClient
     */

    import { auditLogger } from '../../utils/auditLogger.js';
    import type {
      LegislativeDocument,
      PaginatedResponse,
    } from '../../types/europeanParliament.js';
    import {
      transformDocument as _transformDocument,
    } from './transformers.js';
    import {
      BaseEPClient,
      APIError,
      type EPClientConfig,
      type EPSharedResources,
      type JSONLDResponse,
    } from './baseClient.js';
    import { DEFAULT_TIMEOUTS } from '../../utils/timeout.js';

    /**
     * Sub-client for document EP API endpoints.
     *
     * @extends BaseEPClient
     * @public
     */
    export class DocumentClient extends BaseEPClient {
      constructor(config: EPClientConfig = {}, shared?: EPSharedResources) {
        super(config, shared);
      }

      private transformDocument(apiData: Record<string, unknown>): LegislativeDocument {
        return _transformDocument(apiData);
      }

      /**
       * Builds EP API parameters for document search.
       * @private
       */
      private buildDocumentSearchParams(params: {
        documentType?: string;
        dateFrom?: string;
        limit?: number;
        offset?: number;
      }): Record<string, unknown> {
        const apiParams: Record<string, unknown> = {};
        Eif (params.limit !== undefined) apiParams['limit'] = params.limit;
        if (params.offset !== undefined) apiParams['offset'] = params.offset;
        if (params.documentType !== undefined && params.documentType !== '') {
          const typeMap: Record<string, string> = {
            REPORT: 'REPORT_PLENARY',
            AMENDMENT: 'AMENDMENT_LIST',
            RESOLUTION: 'RESOLUTION_MOTION',
            ADOPTED: 'TEXT_ADOPTED',
            DECISION: 'DECISION',
            DIRECTIVE: 'DIRECTIVE_PROPOSAL',
            REGULATION: 'REGULATION',
            OPINION: 'OPINION',
          };
          apiParams['work-type'] =
            typeMap[params.documentType.toUpperCase()] ?? params.documentType;
        }
        if (params.dateFrom !== undefined && params.dateFrom !== '') {
          apiParams['year'] = params.dateFrom.substring(0, 4);
        }
        return apiParams;
      }

      /**
       * Applies client-side keyword, committee, and date-range filters to documents.
       * @private
       */
      private filterDocuments(
        documents: LegislativeDocument[],
        params: { keyword?: string; committee?: string; dateTo?: string }
      ): LegislativeDocument[] {
        let filtered = documents;
        Eif (params.keyword !== undefined && params.keyword !== '') {
          const keywordLower = params.keyword.toLowerCase();
          filtered = filtered.filter(
            (d) =>
              d.title.toLowerCase().includes(keywordLower) ||
              d.summary?.toLowerCase().includes(keywordLower) === true ||
              d.id.toLowerCase().includes(keywordLower)
          );
        }
        if (params.committee !== undefined && params.committee !== '') {
          const committeeLower = params.committee.toLowerCase();
          filtered = filtered.filter(
            (d) => d.committee?.toLowerCase().includes(committeeLower) === true
          );
        }
        Iif (params.dateTo !== undefined && params.dateTo !== '') {
          const dateTo = params.dateTo;
          filtered = filtered.filter((d) => d.date <= dateTo);
        }
        return filtered;
      }

      /**
       * Searches legislative documents by keyword, type, date, and committee.
       *
       * **EP API Endpoint:** `GET /documents`
       *
       * @param params - keyword, documentType, dateFrom, dateTo, committee, limit, offset
       * @returns Paginated legislative documents list
       * @security Audit logged per GDPR Article 30
       */
      async searchDocuments(params: {
        keyword: string;
        documentType?: string;
        dateFrom?: string;
        dateTo?: string;
        committee?: string;
        limit?: number;
        offset?: number;
      }): Promise<PaginatedResponse<LegislativeDocument>> {
        const action = 'search_documents';
        try {
          Iif (params.keyword.trim() === '') {
            throw new APIError('keyword is required and must not be empty', 400);
          }
          const requestedLimit = params.limit ?? 20;
          const currentOffset = params.offset ?? 0;

          const apiParams = this.buildDocumentSearchParams(params);
          apiParams['limit'] = requestedLimit;
          apiParams['offset'] = currentOffset;
          const response = await this.get<JSONLDResponse>('documents', apiParams);
          const pageSize = response.data.length;

          let documents = response.data.map((item) => this.transformDocument(item));
          documents = this.filterDocuments(documents, params);

          const hasMore = pageSize === requestedLimit;
          const filteredCount = documents.length;
          const result: PaginatedResponse<LegislativeDocument> = {
            data: documents,
            total: currentOffset + filteredCount + (hasMore ? 1 : 0),
            limit: requestedLimit,
            offset: currentOffset,
            hasMore,
          };

          auditLogger.logDataAccess(action, params, result.data.length);
          return result;
        } catch (error: unknown) {
          auditLogger.logError(
            action,
            params,
            error instanceof Error ? error.message : 'Unknown error'
          );
          throw error;
        }
      }

      /**
       * Returns plenary documents.
       * **EP API Endpoint:** `GET /plenary-documents`
       */
      async getPlenaryDocuments(params: {
        year?: number;
        limit?: number;
        offset?: number;
      } = {}): Promise<PaginatedResponse<LegislativeDocument>> {
        const limit = params.limit ?? 50;
        const offset = params.offset ?? 0;
        const apiParams: Record<string, unknown> = {
          format: 'application/ld+json',
          offset,
          limit,
        };
        if (params.year !== undefined) apiParams['year'] = params.year;

        const response = await this.get<JSONLDResponse>('plenary-documents', apiParams);
        const items = Array.isArray(response.data) ? response.data : [];
        const docs = items.map((item) => this.transformDocument(item));
        const hasMore = docs.length === limit;
        return { data: docs, total: docs.length + offset + (hasMore ? 1 : 0), limit, offset, hasMore };
      }

      /**
       * Returns committee documents.
       * **EP API Endpoint:** `GET /committee-documents`
       *
       * **Note:** The EP API `/committee-documents` endpoint does **not**
       * support a `year` query parameter per the OpenAPI spec.
       * Only pagination (limit/offset) is supported.
       */
      async getCommitteeDocuments(params: {
        limit?: number;
        offset?: number;
      } = {}): Promise<PaginatedResponse<LegislativeDocument>> {
        const limit = params.limit ?? 50;
        const offset = params.offset ?? 0;
        const apiParams: Record<string, unknown> = {
          format: 'application/ld+json',
          offset,
          limit,
        };

        const response = await this.get<JSONLDResponse>('committee-documents', apiParams);
        const items = Array.isArray(response.data) ? response.data : [];
        const docs = items.map((item) => this.transformDocument(item));
        const hasMore = docs.length === limit;
        return { data: docs, total: docs.length + offset + (hasMore ? 1 : 0), limit, offset, hasMore };
      }

      /**
       * Returns plenary session documents.
       * **EP API Endpoint:** `GET /plenary-session-documents`
       */
      async getPlenarySessionDocuments(params: {
        limit?: number;
        offset?: number;
      } = {}): Promise<PaginatedResponse<LegislativeDocument>> {
        const limit = params.limit ?? 50;
        const offset = params.offset ?? 0;

        const response = await this.get<JSONLDResponse>('plenary-session-documents', {
          format: 'application/ld+json',
          offset,
          limit,
        });

        const items = Array.isArray(response.data) ? response.data : [];
        const docs = items.map((item) => this.transformDocument(item));
        const hasMore = docs.length === limit;
        return { data: docs, total: docs.length + offset + (hasMore ? 1 : 0), limit, offset, hasMore };
      }

      /**
       * Returns all Plenary Session Document Items.
       * **EP API Endpoint:** `GET /plenary-session-documents-items`
       */
      async getPlenarySessionDocumentItems(params: {
        limit?: number;
        offset?: number;
      } = {}): Promise<PaginatedResponse<LegislativeDocument>> {
        const limit = params.limit ?? 50;
        const offset = params.offset ?? 0;

        const response = await this.get<JSONLDResponse>(
          'plenary-session-documents-items',
          { format: 'application/ld+json', offset, limit }
        );

        const items = Array.isArray(response.data) ? response.data : [];
        const docs = items.map((item) => this.transformDocument(item));
        const hasMore = docs.length === limit;
        return { data: docs, total: docs.length + offset + (hasMore ? 1 : 0), limit, offset, hasMore };
      }

      /**
       * Returns all External Documents.
       * **EP API Endpoint:** `GET /external-documents`
       *
       * **Note:** The EP API `/external-documents` endpoint does **not**
       * support a `year` query parameter per the OpenAPI spec.
       * Only pagination (limit/offset) is supported.
       */
      async getExternalDocuments(params: {
        limit?: number;
        offset?: number;
      } = {}): Promise<PaginatedResponse<LegislativeDocument>> {
        const limit = params.limit ?? 50;
        const offset = params.offset ?? 0;
        const apiParams: Record<string, unknown> = {
          format: 'application/ld+json',
          offset,
          limit,
        };

        const response = await this.get<JSONLDResponse>('external-documents', apiParams);
        const items = Array.isArray(response.data) ? response.data : [];
        const docs = items.map((item) => this.transformDocument(item));
        const hasMore = docs.length === limit;
        return { data: docs, total: docs.length + offset + (hasMore ? 1 : 0), limit, offset, hasMore };
      }

      /**
       * Retrieves recently updated documents via the feed endpoint.
       * **EP API Endpoint:** `GET /documents/feed`
       *
       * This is a **fixed-window feed** — the EP API does NOT accept a
       * `timeframe` parameter.  It returns updates from a server-defined
       * default window (typically one month).  Response times can exceed
       * 120 s, so an extended minimum timeout is applied automatically.
       */
      async getDocumentsFeed(): Promise<JSONLDResponse> {
        return this.get<JSONLDResponse>('documents/feed', {
          format: 'application/ld+json',
        }, DEFAULT_TIMEOUTS.EP_FEED_SLOW_REQUEST_MS);
      }

      /**
       * Retrieves recently updated plenary documents via the feed endpoint.
       * **EP API Endpoint:** `GET /plenary-documents/feed`
       *
       * Fixed-window feed — no `timeframe` parameter.
       * Extended timeout applied (120 s minimum).
       */
      async getPlenaryDocumentsFeed(): Promise<JSONLDResponse> {
        return this.get<JSONLDResponse>('plenary-documents/feed', {
          format: 'application/ld+json',
        }, DEFAULT_TIMEOUTS.EP_FEED_SLOW_REQUEST_MS);
      }

      /**
       * Retrieves recently updated committee documents via the feed endpoint.
       * **EP API Endpoint:** `GET /committee-documents/feed`
       *
       * Fixed-window feed — no `timeframe` parameter.
       * Extended timeout applied (120 s minimum).
       */
      async getCommitteeDocumentsFeed(): Promise<JSONLDResponse> {
        return this.get<JSONLDResponse>('committee-documents/feed', {
          format: 'application/ld+json',
        }, DEFAULT_TIMEOUTS.EP_FEED_SLOW_REQUEST_MS);
      }

      /**
       * Retrieves recently updated plenary session documents via the feed endpoint.
       * **EP API Endpoint:** `GET /plenary-session-documents/feed`
       *
       * Fixed-window feed — no `timeframe` parameter.
       * Extended timeout applied (120 s minimum).
       */
      async getPlenarySessionDocumentsFeed(): Promise<JSONLDResponse> {
        return this.get<JSONLDResponse>('plenary-session-documents/feed', {
          format: 'application/ld+json',
        }, DEFAULT_TIMEOUTS.EP_FEED_SLOW_REQUEST_MS);
      }

      /**
       * Retrieves recently updated external documents via the feed endpoint.
       * **EP API Endpoint:** `GET /external-documents/feed`
       *
       * This is a **configurable-window feed** that accepts `timeframe`,
       * `start-date`, and `work-type` parameters.
       * Extended timeout applied for `one-month` timeframe.
       */
      async getExternalDocumentsFeed(params: {
        timeframe?: string;
        startDate?: string;
        workType?: string;
      } = {}): Promise<JSONLDResponse> {
        const minimumTimeout = params.timeframe === 'one-month'
          ? DEFAULT_TIMEOUTS.EP_FEED_SLOW_REQUEST_MS
          : undefined;
        return this.get<JSONLDResponse>('external-documents/feed', {
          format: 'application/ld+json',
          ...(params.timeframe !== undefined ? { timeframe: params.timeframe } : {}),
          ...(params.startDate !== undefined ? { 'start-date': params.startDate } : {}),
          ...(params.workType !== undefined ? { 'work-type': params.workType } : {}),
        }, minimumTimeout);
      }

      /**
       * Returns a single document by ID.
       * **EP API Endpoint:** `GET /documents/{doc-id}`
       */
      async getDocumentById(docId: string): Promise<LegislativeDocument> {
        if (docId.trim() === '') throw new APIError('Document ID is required', 400);
        const response = await this.get<Record<string, unknown>>(
          `documents/${docId}`,
          { format: 'application/ld+json' }
        );
        return this.transformDocument(response);
      }

      /**
       * Returns a single plenary document by ID.
       * **EP API Endpoint:** `GET /plenary-documents/{doc-id}`
       */
      async getPlenaryDocumentById(docId: string): Promise<LegislativeDocument> {
        if (docId.trim() === '') throw new APIError('Document ID is required', 400);
        const response = await this.get<Record<string, unknown>>(
          `plenary-documents/${docId}`,
          { format: 'application/ld+json' }
        );
        return this.transformDocument(response);
      }

      /**
       * Returns a single plenary session document by ID.
       * **EP API Endpoint:** `GET /plenary-session-documents/{doc-id}`
       */
      async getPlenarySessionDocumentById(docId: string): Promise<LegislativeDocument> {
        if (docId.trim() === '') throw new APIError('Document ID is required', 400);
        const response = await this.get<Record<string, unknown>>(
          `plenary-session-documents/${docId}`,
          { format: 'application/ld+json' }
        );
        return this.transformDocument(response);
      }

      /**
       * Returns a single committee document by ID.
       * **EP API Endpoint:** `GET /committee-documents/{doc-id}`
       */
      async getCommitteeDocumentById(docId: string): Promise<LegislativeDocument> {
        if (docId.trim() === '') throw new APIError('Document ID is required', 400);
        const response = await this.get<Record<string, unknown>>(
          `committee-documents/${docId}`,
          { format: 'application/ld+json' }
        );
        return this.transformDocument(response);
      }

      /**
       * Returns a single external document by ID.
       * **EP API Endpoint:** `GET /external-documents/{doc-id}`
       */
      async getExternalDocumentById(docId: string): Promise<LegislativeDocument> {
        if (docId.trim() === '') throw new APIError('Document ID is required', 400);
        const response = await this.get<Record<string, unknown>>(
          `external-documents/${docId}`,
          { format: 'application/ld+json' }
        );
        return this.transformDocument(response);
      }
    }