# All files / src/tools/generateReport reportGenerators.ts

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     /**
     * Report generators for different report types
     *
     * ISMS Policy: SC-002 (Input Validation), AC-003 (Least Privilege)
     */

    import type { z } from 'zod';
    import type { GenerateReportSchema } from '../../schemas/europeanParliament.js';
    import { epClient } from '../../clients/europeanParliamentClient.js';
    import { APIError } from '../../clients/ep/baseClient.js';
    import { auditLogger, toErrorMessage } from '../../utils/auditLogger.js';
    import type { MEPDetails, Committee } from '../../types/europeanParliament.js';
    import type { Report } from './types.js';
    import { ToolError } from '../shared/errors.js';
    import {
      createVotingSection,
      createCommitteeSection,
      createParliamentaryQuestionsSection,
      createMeetingActivitySection,
      createLegislativeOutputSection,
      createMemberParticipationSection,
      createOverallVotingSection,
      createAdoptionRatesSection,
      createPoliticalGroupSection,
      createNewProposalsSection,
      createCompletedProceduresSection,
      createOngoingProceduresSection
    } from './reportBuilders.js';

    /**
     * Extract MEP data for report generation
     * Cyclomatic complexity: 1
     */
    function extractMEPData(
      params: z.infer<typeof GenerateReportSchema>,
      mep: MEPDetails | null
    ): {
      mepName: string;
      dateFrom: string;
      dateTo: string;
      totalVotes: number;
      committeesLength: number;
    } {
      return {
        mepName: mep?.name ?? 'Unknown MEP',
        dateFrom: params.dateFrom ?? '2024-01-01',
        dateTo: params.dateTo ?? '2024-12-31',
        totalVotes: mep?.votingStatistics?.totalVotes ?? 0,
        committeesLength: mep?.committees.length ?? 0
      };
    }

    /**
     * Sanitize a subject ID for inclusion in error messages.
     * Truncates to 100 chars and strips control characters to prevent log injection.
     */
    function sanitizeSubjectId(subjectId: string): string {
      return subjectId.replace(/[\x00-\x1F\x7F]/g, '').slice(0, 100);
    }

    /** Fetch MEP details (null if subjectId not provided; throws ToolError for 404) */
    async function fetchMEPDetails(subjectId: string | undefined): Promise<MEPDetails | null> {
      Iif (subjectId === undefined) return null;
      try {
        return await epClient.getMEPDetails(subjectId);
      } catch (error: unknown) {
        if (error instanceof APIError && error.statusCode === 404) {
          throw new ToolError({
            toolName: 'generate_report',
            operation: 'generateReport',
            message: `MEP not found: '${sanitizeSubjectId(subjectId)}' is not a valid MEP identifier`,
            isRetryable: false,
            errorCode: 'UPSTREAM_404',
            httpStatus: 404,
          });
        }
        auditLogger.logError('generate_report.fetch_mep_details', { subjectId }, toErrorMessage(error));
        return null;
      }
    }

    /** Fetch question count for an MEP (null if unavailable) */
    async function fetchQuestionCount(subjectId: string | undefined): Promise<number | null> {
      Iif (subjectId === undefined) return null;
      try {
        const questions = await epClient.getParliamentaryQuestions({ author: subjectId, limit: 100 });
        return questions.data.length;
      } catch (error: unknown) {
        auditLogger.logError('generate_report.fetch_question_count', { subjectId }, toErrorMessage(error));
        return null;
      }
    }

    /** Fetch committee info (null if subjectId not provided; throws ToolError for 404) */
    async function fetchCommitteeInfo(subjectId: string | undefined): Promise<Committee | null> {
      if (subjectId === undefined) return null;
      try {
        return await epClient.getCommitteeInfo({ id: subjectId });
      } catch (error: unknown) {
        if (error instanceof APIError && error.statusCode === 404) {
          throw new ToolError({
            toolName: 'generate_report',
            operation: 'generateReport',
            message: `Committee not found: '${sanitizeSubjectId(subjectId)}' is not a valid committee identifier`,
            isRetryable: false,
            errorCode: 'UPSTREAM_404',
            httpStatus: 404,
          });
        }
        auditLogger.logError('generate_report.fetch_committee_info', { subjectId }, toErrorMessage(error));
        return null;
      }
    }

    /** Fetch committee document count lower bound (first page only — EP API does not support year filtering or total counts) */
    async function fetchDocumentCountLowerBound(logContext: { year: number }): Promise<number | null> {
      try {
        const docs = await epClient.getCommitteeDocuments({ limit: 100 });
        return docs.data.length;
      } catch (error: unknown) {
        auditLogger.logError('generate_report.fetch_document_count_lower_bound', logContext, toErrorMessage(error));
        return null;
      }
    }

    /** Fetch adopted text count for a year (null if unavailable) */
    async function fetchAdoptedTextCount(year: number): Promise<number | null> {
      try {
        const adopted = await epClient.getAdoptedTexts({ year, limit: 100 });
        return adopted.data.length;
      } catch (error: unknown) {
        auditLogger.logError('generate_report.fetch_adopted_text_count', { year }, toErrorMessage(error));
        return null;
      }
    }

    /** Fetch plenary session count for a date range (null if unavailable) */
    async function fetchSessionCount(dateFrom: string, dateTo: string): Promise<number | null> {
      try {
        const year = parseInt(dateFrom.substring(0, 4), 10);
        const sessions = await epClient.getPlenarySessions({ year, limit: 100 });
        return sessions.data.length;
      } catch (error: unknown) {
        auditLogger.logError('generate_report.fetch_session_count', { dateFrom, dateTo }, toErrorMessage(error));
        return null;
      }
    }

    /** Fetch procedure count lower bound (first page only — EP API does not support year filtering or total counts) */
    async function fetchProcedureCountLowerBound(logContext: { year: number }): Promise<number | null> {
      try {
        const procedures = await epClient.getProcedures({ limit: 100 });
        return procedures.data.length;
      } catch (error: unknown) {
        auditLogger.logError('generate_report.fetch_procedure_count_lower_bound', logContext, toErrorMessage(error));
        return null;
      }
    }

    /** Build data quality warnings for MEP activity report */
    function buildMEPWarnings(
      mep: MEPDetails | null,
      questionsSubmitted: number | null,
      subjectIdProvided: boolean
    ): string[] {
      const warnings: string[] = [];
      if (mep === null) {
        warnings.push(subjectIdProvided
          ? 'MEP details unavailable from EP API; upstream data source failed.'
          : 'MEP details not available; subject ID was not provided.');
      }
      Iif (questionsSubmitted === null) {
        warnings.push('Parliamentary questions count unavailable from EP API.');
      }
      if (mep !== null && mep.votingStatistics === undefined) {
        warnings.push('Voting statistics not available for this MEP.');
      }
      warnings.push('Reports authored count is always zero; EP API does not provide per-MEP report authorship data.');
      return warnings;
    }

    /** Build data quality warnings for committee performance report */
    function buildCommitteeWarnings(
      committee: Committee | null,
      documentsProduced: number | null,
      reportsProduced: number | null,
      subjectIdProvided: boolean
    ): string[] {
      const warnings: string[] = [];
      Iif (committee === null) {
        warnings.push(subjectIdProvided
          ? 'Committee details unavailable from EP API; upstream data source failed.'
          : 'Committee details not available; subject ID was not provided.');
      }
      Iif (documentsProduced === null) {
        warnings.push('Committee documents count unavailable from EP API.');
      }
      Iif (reportsProduced === null) {
        warnings.push('Adopted texts count unavailable from EP API.');
      }
      warnings.push('Meeting count is always zero; EP API does not provide committee-specific meeting counts.');
      warnings.push('Document and adopted text counts are parliament-wide (first page), not filtered by committee.');
      return warnings;
    }

    /** Build data quality warnings for voting statistics report */
    function buildVotingWarnings(
      sessionCount: number | null,
      adoptedCount: number | null,
      dateFrom: string,
      dateTo: string
    ): string[] {
      const warnings: string[] = [];
      if (sessionCount === null) {
        warnings.push('Plenary session count unavailable from EP API.');
      }
      Iif (adoptedCount === null) {
        warnings.push('Adopted texts count unavailable from EP API.');
      }
      warnings.push('Average turnout is always zero; EP API does not provide turnout data.');
      warnings.push('Political group alignment requires the compare_political_groups tool for detailed analysis.');
      if (!isFullYearRange(dateFrom, dateTo)) {
        warnings.push(
          'Plenary session count and adopted texts count are based on the full year derived from dateFrom; '
          + 'partial-year date ranges are not applied to these EP API calls.'
        );
      }
      return warnings;
    }

    /** Check whether a date range spans an entire calendar year (Jan 1 – Dec 31). */
    function isFullYearRange(dateFrom: string, dateTo: string): boolean {
      return dateFrom.endsWith('-01-01') && dateTo.endsWith('-12-31')
        && dateFrom.substring(0, 4) === dateTo.substring(0, 4);
    }

    /**
     * Throw a ToolError when all EP API data fetches failed.
     * This prevents returning a successful-looking report with all-zero statistics,
     * which could mislead AI agents into treating empty data as valid.
     */
    function throwIfAllDataUnavailable(
      reportType: string,
      fetchResults: unknown[]
    ): void {
      if (fetchResults.every((r) => r === null)) {
        throw new ToolError({
          toolName: 'generate_report',
          operation: 'generateReport',
          message: `EP API data unavailable for ${reportType} report — all upstream data sources failed`,
          isRetryable: true,
          errorCode: 'UPSTREAM_503',
          httpStatus: 503,
        });
      }
    }

    /** Build data quality warnings for legislation progress report */
    function buildLegislationWarnings(
      procedureCount: number | null,
      completedCount: number | null,
      ongoingCount: number | null
    ): string[] {
      const warnings: string[] = [];
      Iif (procedureCount === null) {
        warnings.push('Legislative procedures count unavailable from EP API.');
      }
      if (completedCount === null) {
        warnings.push('Completed procedures (adopted texts) count unavailable from EP API.');
      }
      if (ongoingCount === null) {
        warnings.push('Ongoing procedures count could not be calculated due to missing data.');
      }
      warnings.push('Counts are lower bounds based on first page of API results (limit 100).');
      warnings.push('Ongoing count is estimated as total procedures minus adopted texts.');
      return warnings;
    }

    /**
     * Generate MEP activity report using real EP API data
     * Cyclomatic complexity: 2
     */
    export async function generateMEPActivityReport(
      params: z.infer<typeof GenerateReportSchema>
    ): Promise<Report> {
      const mep = await fetchMEPDetails(params.subjectId);
      const data = extractMEPData(params, mep);
      const questionsSubmitted = await fetchQuestionCount(params.subjectId);
      Eif (params.subjectId !== undefined) {
        throwIfAllDataUnavailable('MEP_ACTIVITY', [mep, questionsSubmitted]);
      }
      const warnings = buildMEPWarnings(mep, questionsSubmitted, params.subjectId !== undefined);

      return {
        reportType: 'MEP_ACTIVITY',
        subject: data.mepName,
        period: {
          from: data.dateFrom,
          to: data.dateTo
        },
        generatedAt: new Date().toISOString(),
        summary: `Activity report for ${data.mepName} covering the period from ${data.dateFrom} to ${data.dateTo}.`,
        sections: [
          createVotingSection(data.totalVotes, mep),
          createCommitteeSection(data.committeesLength, mep),
          createParliamentaryQuestionsSection(questionsSubmitted)
        ],
        statistics: {
          totalVotes: mep?.votingStatistics?.totalVotes ?? 0,
          attendanceRate: mep?.votingStatistics?.attendanceRate ?? 0,
          questionsSubmitted: questionsSubmitted ?? 0,
          reportsAuthored: 0
        },
        recommendations: [
          'Continue active participation in committee work',
          'Increase engagement with constituents',
          'Consider authoring legislation on key policy areas'
        ],
        dataQualityWarnings: warnings
      };
    }

    /**
     * Generate committee performance report using real EP API data
     * Cyclomatic complexity: 2
     */
    export async function generateCommitteePerformanceReport(
      params: z.infer<typeof GenerateReportSchema>
    ): Promise<Report> {
      const committee = await fetchCommitteeInfo(params.subjectId);
      const committeeName = committee?.name ?? 'Unknown Committee';
      const dateFrom = params.dateFrom ?? '2024-01-01';
      const dateTo = params.dateTo ?? '2024-12-31';
      const membersLength = committee?.members.length ?? 0;
      const year = parseInt(dateFrom.substring(0, 4), 10);

      const documentsProduced = await fetchDocumentCountLowerBound({ year });
      const reportsProduced = await fetchAdoptedTextCount(year);
      throwIfAllDataUnavailable('COMMITTEE_PERFORMANCE', [committee, documentsProduced, reportsProduced]);
      const warnings = buildCommitteeWarnings(committee, documentsProduced, reportsProduced, params.subjectId !== undefined);

      return {
        reportType: 'COMMITTEE_PERFORMANCE',
        subject: committeeName,
        period: {
          from: dateFrom,
          to: dateTo
        },
        generatedAt: new Date().toISOString(),
        summary: `Performance report for ${committeeName} committee. Note: document and adopted text counts are parliament-wide lower bounds (first page, not filtered by committee).`,
        sections: [
          createMeetingActivitySection(0),
          createLegislativeOutputSection(reportsProduced, documentsProduced),
          createMemberParticipationSection(membersLength)
        ],
        statistics: {
          meetingsHeld: 0,
          reportsProduced: reportsProduced ?? 0,
          opinionsIssued: 0,
          averageAttendance: 0,
          memberCount: membersLength
        },
        dataQualityWarnings: warnings
      };
    }

    /**
     * Generate voting statistics report using real EP API data
     * Cyclomatic complexity: 1
     */
    export async function generateVotingStatisticsReport(
      params: z.infer<typeof GenerateReportSchema>
    ): Promise<Report> {
      const dateFrom = params.dateFrom ?? '2024-01-01';
      const dateTo = params.dateTo ?? '2024-12-31';
      const year = parseInt(dateFrom.substring(0, 4), 10);

      const sessionCount = await fetchSessionCount(dateFrom, dateTo);
      const adoptedCount = await fetchAdoptedTextCount(year);
      throwIfAllDataUnavailable('VOTING_STATISTICS', [sessionCount, adoptedCount]);
      const warnings = buildVotingWarnings(sessionCount, adoptedCount, dateFrom, dateTo);

      return {
        reportType: 'VOTING_STATISTICS',
        subject: 'Parliament-wide Voting Analysis',
        period: {
          from: dateFrom,
          to: dateTo
        },
        generatedAt: new Date().toISOString(),
        summary: 'Comprehensive voting statistics for European Parliament based on EP Open Data.',
        sections: [
          createOverallVotingSection(sessionCount),
          createAdoptionRatesSection(adoptedCount),
          createPoliticalGroupSection()
        ],
        statistics: {
          totalSessions: sessionCount ?? 0,
          adopted: adoptedCount ?? 0,
          averageTurnout: 0
        },
        dataQualityWarnings: warnings
      };
    }

    /**
     * Generate legislation progress report using real EP API data
     * Cyclomatic complexity: 1
     */
    export async function generateLegislationProgressReport(
      params: z.infer<typeof GenerateReportSchema>
    ): Promise<Report> {
      const dateFrom = params.dateFrom ?? '2024-01-01';
      const dateTo = params.dateTo ?? '2024-12-31';
      const year = parseInt(dateFrom.substring(0, 4), 10);

      const procedureCount = await fetchProcedureCountLowerBound({ year });
      const completedCount = await fetchAdoptedTextCount(year);
      throwIfAllDataUnavailable('LEGISLATION_PROGRESS', [procedureCount, completedCount]);
      const ongoingCount = (procedureCount !== null && completedCount !== null)
        ? Math.max(0, procedureCount - completedCount)
        : null;
      const warnings = buildLegislationWarnings(procedureCount, completedCount, ongoingCount);

      return {
        reportType: 'LEGISLATION_PROGRESS',
        subject: 'Legislative Activity Overview',
        period: {
          from: dateFrom,
          to: dateTo
        },
        generatedAt: new Date().toISOString(),
        summary: 'Progress report on legislative procedures based on EP Open Data (lower bounds, first page).',
        sections: [
          createNewProposalsSection(procedureCount),
          createCompletedProceduresSection(completedCount),
          createOngoingProceduresSection(ongoingCount)
        ],
        statistics: {
          totalProcedures: procedureCount ?? 0,
          completed: completedCount ?? 0,
          ongoing: ongoingCount ?? 0
        },
        dataQualityWarnings: warnings
      };
    }