# All files / src/tools/trackLegislation procedureTracker.ts

100% Statements 57/57
96.77% Branches 60/62
100% Functions 13/13
100% Lines 52/52

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     /**
     * Procedure tracker for legislative data
     *
     * Transforms real EP API Procedure data into structured legislative
     * tracking output. Most fields are derived from the API response.
     * Amendment counts and voting records are placeholder zeros/empty arrays
     * because the single-procedure endpoint does not provide them; these
     * are flagged via {@link LegislativeProcedure.dataQualityWarnings}.
     *
     * ISMS Policy: SC-002 (Input Validation)
     */

    import type { Procedure, EPEvent } from '../../types/europeanParliament.js';
    import type { LegislativeProcedure } from './types.js';

    /**
     * Derive a timeline from the procedure's date fields.
     * All dates come from the real EP API response.
     */
    function buildTimeline(procedure: Procedure): LegislativeProcedure['timeline'] {
      const events: LegislativeProcedure['timeline'] = [];

      if (procedure.dateInitiated) {
        events.push({
          date: procedure.dateInitiated,
          stage: 'Initiated',
          description: `Procedure ${procedure.reference || procedure.id} initiated`,
        });
      }

      if (procedure.dateLastActivity && procedure.dateLastActivity !== procedure.dateInitiated) {
        events.push({
          date: procedure.dateLastActivity,
          stage: procedure.stage || 'Latest activity',
          description: `Latest recorded activity for ${procedure.reference || procedure.id}`,
        });
      }

      return events;
    }

    /**
     * Build timeline entries from EP procedure events.
     * Events come from the `/procedures/{process-id}/events` endpoint,
     * where `process-id` is the EP procedure process identifier.
     * The returned entries are not sorted here; {@link mergeAndSortTimeline}
     * performs the final chronological sort on the merged list.
     */
    function buildTimelineFromEvents(events: EPEvent[]): LegislativeProcedure['timeline'] {
      return events
        .filter((event) => Boolean(event.date))
        .map((event) => ({
          date: event.date,
          stage: event.type || 'Event',
          description: event.title || event.id,
          ...(event.organizer ? { responsible: event.organizer } : {}),
        }));
    }

    /**
     * Derive committee assignments from the procedure data.
     */
    function buildCommittees(procedure: Procedure): LegislativeProcedure['committees'] {
      if (!procedure.responsibleCommittee) {
        return [];
      }
      const assignment: LegislativeProcedure['committees'][number] = {
        abbreviation: procedure.responsibleCommittee,
        role: 'LEAD' as const,
      };
      if (procedure.rapporteur) {
        assignment.rapporteur = procedure.rapporteur;
      }
      return [assignment];
    }

    /**
     * Derive next steps from the current stage.
     */
    function buildNextSteps(procedure: Procedure): string[] {
      const steps: string[] = [];
      if (procedure.stage) {
        steps.push(`Current stage: ${procedure.stage}`);
      }
      if (procedure.status) {
        steps.push(`Status: ${procedure.status}`);
      }
      return steps;
    }

    /**
     * Build per-field data-quality warnings from the procedure response.
     */
    function buildDataQualityWarnings(procedure: Procedure): string[] {
      const warnings: string[] = [
        'Amendment statistics not available from single procedure endpoint; proposed/adopted/rejected counts are zero.',
        'Voting records not available from single procedure endpoint; voting array is empty.',
      ];
      if (!procedure.dateInitiated) {
        warnings.push('Procedure initiation date is missing from EP API response.');
      }
      if (!procedure.dateLastActivity) {
        warnings.push('Last activity date is missing from EP API response.');
      }
      if (!procedure.responsibleCommittee) {
        warnings.push('Responsible committee is not assigned or missing from EP API response.');
      }
      if (!procedure.rapporteur) {
        warnings.push('Rapporteur is not assigned or missing from EP API response.');
      }
      return warnings;
    }

    /**
     * Determine which internal enrichment sub-steps could not be resolved from the
     * procedure payload. `basicMetadata` is added only when no usable timeline
     * entry exists (neither procedure dates nor dated events produced any entry).
     */
    function collectInternalEnrichmentFailures(
      procedure: Procedure,
      eventsTimelineLength: number
    ): string[] {
      const failures: string[] = [];
      if (!procedure.responsibleCommittee) failures.push('committeeResolve');
      if (!procedure.rapporteur) failures.push('rapporteurResolve');
      if (procedure.documents.length === 0) failures.push('documentResolve');
      if (!procedure.dateInitiated && !procedure.dateLastActivity && eventsTimelineLength === 0) {
        failures.push('basicMetadata');
      }
      return failures;
    }

    /**
     * Merge procedure-date timeline and events timeline, deduplicate by
     * `date:stage` key (procedure-date entries take precedence), and sort
     * chronologically by date so consumers receive a time-ordered sequence.
     */
    function mergeAndSortTimeline(
      procedureTimeline: LegislativeProcedure['timeline'],
      eventsTimeline: LegislativeProcedure['timeline']
    ): LegislativeProcedure['timeline'] {
      const seenKeys = new Set<string>();
      const deduped = [...procedureTimeline, ...eventsTimeline].filter((entry) => {
        const key = `${entry.date}:${entry.stage}`;
        if (seenKeys.has(key)) return false;
        seenKeys.add(key);
        return true;
      });
      return deduped.sort((a, b) => a.date.localeCompare(b.date));
    }

    /**
     * Build a legislative tracking result from a real EP API Procedure.
     *
     * Most fields are derived directly from the API response. Amendment counts
     * and voting records are placeholders (zeros / empty array) because the
     * single-procedure endpoint does not supply them; these are surfaced in
     * {@link LegislativeProcedure.dataQualityWarnings}.
     *
     * Per-step enrichment failures are tracked and returned in
     * {@link LegislativeProcedure.enrichmentFailures} so that consumers can
     * identify exactly which data dimensions are incomplete and weight
     * per-field confidence accordingly.
     *
     * @param procedure - Real procedure data from EP API
     * @param events - Optional events from `/procedures/{process-id}/events` endpoint for timeline enrichment
     * @param externalEnrichmentFailures - Named sub-steps that already failed before this call
     *   (e.g. `["events-lookup"]` when the events API call threw an error)
     * @returns Structured legislative tracking data
     */
    export function buildLegislativeTracking(
      procedure: Procedure,
      events: EPEvent[] = [],
      externalEnrichmentFailures: string[] = []
    ): LegislativeProcedure {
      const procedureTimeline = buildTimeline(procedure);
      const eventsTimeline = buildTimelineFromEvents(events);
      const timeline = mergeAndSortTimeline(procedureTimeline, eventsTimeline);

      const enrichmentFailures = [
        ...externalEnrichmentFailures,
        ...collectInternalEnrichmentFailures(procedure, eventsTimeline.length),
      ];

      const confidenceLevel: LegislativeProcedure['confidenceLevel'] =
        timeline.length > 0 && Boolean(procedure.responsibleCommittee) ? 'MEDIUM' : 'LOW';

      return {
        procedureId: procedure.id,
        title: procedure.title,
        type: procedure.type,
        status: procedure.status || 'COMMITTEE',
        currentStage: procedure.stage || 'Unknown',
        timeline,
        committees: buildCommittees(procedure),
        amendments: { proposed: 0, adopted: 0, rejected: 0 },
        voting: [],
        documents: procedure.documents.map((docRef) => ({
          id: docRef,
          type: 'Document',
          date: procedure.dateLastActivity || procedure.dateInitiated || '',
          title: `Reference: ${docRef}`,
        })),
        nextSteps: buildNextSteps(procedure),
        confidenceLevel,
        methodology: 'Real-time data from EP API /procedures endpoint. '
          + 'Procedure details (title, type, stage, status, dates, committee, rapporteur, documents) '
          + 'are sourced directly from the European Parliament open data API. '
          + 'Timeline is enriched with events from /procedures/{process-id}/events when available. '
          + 'Amendment and voting statistics require separate API calls and are not yet populated. '
          + 'Data source: https://data.europarl.europa.eu/api/v2/procedures',
        dataQualityWarnings: buildDataQualityWarnings(procedure),
        ...(enrichmentFailures.length > 0 ? { enrichmentFailures } : {}),
      };
    }