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* JSON-LD parsing helpers for European Parliament API data.
*
* Pure utility functions for extracting and converting values from
* EP API JSON-LD responses. Used by transform functions and the
* EP client to safely handle heterogeneous API field formats.
*
* @module clients/ep/jsonLdHelpers
*/
import type { DocumentType, DocumentStatus } from '../../types/europeanParliament.js';
// ─── Primitive helpers ──────────────────────────────────────────
/**
* Safely converts an unknown value to a string.
*
* @param value - Value to convert
* @returns String representation or empty string for unsupported types
*/
export function toSafeString(value: unknown): string {
if (typeof value === 'string') return value;
if (typeof value === 'number') return String(value);
if (typeof value === 'boolean') return String(value);
return '';
}
/**
* Returns the first non-undefined value from a record, looked up by key list.
*
* @param data - Record to search
* @param keys - Field names to try in order
* @returns First non-undefined value, or `undefined` if none found
*/
export function firstDefined(data: Record<string, unknown>, ...keys: string[]): unknown {
for (const k of keys) {
if (data[k] !== undefined) return data[k];
}
return undefined;
}
// ─── Field extraction ───────────────────────────────────────────
/**
* Extracts a string value from the first matching field name.
*
* @param data - Record to search
* @param fields - Field names to try in order
* @returns String value from first matching field, or empty string
*/
export function extractField(data: Record<string, unknown>, fields: string[]): string {
for (const field of fields) {
const value = data[field];
if (value !== undefined && value !== null) {
return toSafeString(value);
}
}
return '';
}
// ─── Date handling ──────────────────────────────────────────────
/**
* Extracts an ISO 8601 date string from various EP API date formats.
*
* @param dateField - Raw date field from EP API
* @returns `YYYY-MM-DD` string, or empty string if not parseable
*/
export function extractDateValue(dateField: unknown): string {
if (dateField === null || dateField === undefined) return '';
if (typeof dateField === 'string') {
const parts = dateField.split('T');
return parts[0] ?? '';
}
if (typeof dateField === 'object' && '@value' in dateField) {
const val = (dateField as Record<string, unknown>)['@value'];
if (typeof val === 'string') {
const parts = val.split('T');
return parts[0] ?? '';
}
}
return '';
}
/**
* Extracts a date from activity-specific EP API date formats.
*
* @param activityDate - Raw activity_date field from EP API
* @returns `YYYY-MM-DD` string, or empty string
*/
export function extractActivityDate(activityDate: unknown): string {
if (activityDate === null || activityDate === undefined) return '';
if (typeof activityDate === 'object' && '@value' in activityDate) {
const dateValue = (activityDate as Record<string, unknown>)['@value'];
if (typeof dateValue === 'string') {
const parts = dateValue.split('T');
return parts[0] ?? '';
}
}
return '';
}
// ─── Multilingual text ──────────────────────────────────────────
/**
* Extracts preferred-language text from an array of language-tagged objects.
* Prefers English (`en`) or multilingual (`mul`).
*
* @param items - Array of JSON-LD language-tagged objects
* @returns Text in preferred language, or first available
*/
export function extractTextFromLangArray(items: unknown[]): string {
let fallback = '';
for (const item of items) {
if (typeof item !== 'object' || item === null) continue;
const obj = item as Record<string, unknown>;
const lang = toSafeString(obj['@language']);
const value = toSafeString(obj['@value']);
if (lang === 'en' || lang === 'mul') return value;
if (fallback === '') fallback = value;
}
return fallback;
}
/**
* Extracts a multilingual text value from an EP API JSON-LD field.
*
* Handles plain strings, language-tagged objects, and arrays of language variants.
*
* @param field - Raw field from EP API
* @returns Extracted text string, or empty string
*/
export function extractMultilingualText(field: unknown): string {
if (field === null || field === undefined) return '';
if (typeof field === 'string') return field;
if (typeof field === 'number' || typeof field === 'boolean') return String(field);
if (Array.isArray(field)) return extractTextFromLangArray(field);
Eif (typeof field === 'object') {
const obj = field as Record<string, unknown>;
return toSafeString(obj['en'] ?? obj['@value'] ?? obj['mul']);
}
return '';
}
// ─── Member / Author extraction ─────────────────────────────────
/**
* Extracts member IDs from EP API membership data.
*
* @param memberships - Raw membership field from EP API
* @returns Array of member ID strings
*/
export function extractMemberIds(memberships: unknown): string[] {
const members: string[] = [];
if (!Array.isArray(memberships)) return members;
for (const m of memberships) {
if (typeof m === 'string') {
members.push(m);
E} else if (typeof m === 'object' && m !== null) {
const mObj = m as Record<string, unknown>;
const memberId = toSafeString(mObj['person'] ?? mObj['id'] ?? mObj['@id']);
if (memberId !== '') members.push(memberId);
}
}
return members;
}
/**
* Extracts author ID from EP API author field.
*
* @param authorField - Raw author/attributed-to field
* @returns Author ID string or empty string
*/
export function extractAuthorId(authorField: unknown): string {
if (typeof authorField === 'string') return authorField;
if (Array.isArray(authorField) && authorField.length > 0) {
return toSafeString(authorField[0]);
}
if (typeof authorField === 'object' && authorField !== null) {
const obj = authorField as Record<string, unknown>;
return toSafeString(obj['@id'] ?? obj['id']);
}
return '';
}
/**
* Extracts document reference strings from EP API document fields.
*
* @param docs - Raw document reference field
* @returns Array of document reference strings
*/
export function extractDocumentRefs(docs: unknown): string[] {
if (docs === null || docs === undefined) return [];
if (typeof docs === 'string') return [docs];
Eif (Array.isArray(docs)) {
return docs.map(d => {
if (typeof d === 'string') return d;
Eif (typeof d === 'object' && d !== null) {
const obj = d as Record<string, unknown>;
return toSafeString(obj['id'] ?? obj['identifier'] ?? '');
}
return '';
}).filter(s => s !== '');
}
return [];
}
// ─── Document type / status mapping ─────────────────────────────
/**
* Maps a raw work-type string to a valid DocumentType.
*
* @param rawType - Raw type string from EP API
* @returns Valid DocumentType
*/
export function mapDocumentType(rawType: string): DocumentType {
const normalized = (rawType !== '' ? rawType : 'REPORT').replace(/.*\//, '').toUpperCase();
const validTypes: DocumentType[] = ['REPORT', 'RESOLUTION', 'DECISION', 'DIRECTIVE', 'REGULATION', 'OPINION', 'AMENDMENT'];
return validTypes.find(t => normalized.includes(t)) ?? 'REPORT';
}
/**
* Maps a raw status string to a valid DocumentStatus.
*
* @param rawStatus - Raw status string from EP API
* @returns Valid DocumentStatus
*/
export function mapDocumentStatus(rawStatus: string): DocumentStatus {
const validStatuses: DocumentStatus[] = ['DRAFT', 'SUBMITTED', 'IN_COMMITTEE', 'PLENARY', 'ADOPTED', 'REJECTED'];
return validStatuses.find(s => rawStatus.toUpperCase().includes(s)) ?? 'SUBMITTED';
}
// ─── Location extraction ────────────────────────────────────────
/**
* Extracts location string from EP API locality URL.
*
* @param localityUrl - Raw locality URL or string
* @returns Human-readable location string
*/
export function extractLocation(localityUrl: string): string {
if (localityUrl.includes('FRA_SXB')) return 'Strasbourg';
if (localityUrl.includes('BEL_BRU')) return 'Brussels';
return 'Unknown';
}
// ─── Vote helpers ───────────────────────────────────────────────
/**
* Extracts a numeric vote count from an EP API value.
*
* @param value - Raw vote count value
* @returns Parsed integer count, or 0
*/
export function extractVoteCount(value: unknown): number {
if (value === null || value === undefined) return 0;
if (typeof value === 'number') return value;
if (typeof value === 'string') {
const parsed = parseInt(value, 10);
return isNaN(parsed) ? 0 : parsed;
}
if (Array.isArray(value)) return value.length;
const objValue = (value as Record<string, unknown>)['@value'];
if (objValue !== undefined) {
return extractVoteCount(objValue);
}
return 0;
}
/**
* Determines vote outcome from EP API decision string.
*
* @param decisionStr - Raw decision string from EP API
* @param votesFor - Number of votes for
* @param votesAgainst - Number of votes against
* @returns `'ADOPTED'` or `'REJECTED'`
*/
export function determineVoteOutcome(
decisionStr: string,
votesFor: number,
votesAgainst: number
): 'ADOPTED' | 'REJECTED' {
if (decisionStr.includes('ADOPTED') || decisionStr.includes('APPROVED')) return 'ADOPTED';
if (decisionStr.includes('REJECTED')) return 'REJECTED';
return votesFor >= votesAgainst ? 'ADOPTED' : 'REJECTED';
}
/**
* Maps raw question type string to normalized question type.
*
* @param workType - Raw work type string from EP API
* @returns `'WRITTEN'` or `'ORAL'`
*/
export function mapQuestionType(workType: string): 'WRITTEN' | 'ORAL' {
if (workType.includes('ORAL') || workType.includes('INTERPELLATION') || workType.includes('QUESTION_TIME')) {
return 'ORAL';
}
return 'WRITTEN';
}
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