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// SPDX-License-Identifier: Apache-2.0
/**
* @module Generators/Strategies/MonthlyReviewStrategy
* @description Article strategy for the Month In Review article type.
* Fetches voting records, voting patterns, voting anomalies, and
* parliamentary questions from the past 30 days, then renders a
* comprehensive retrospective analysis article.
*/
import type { EuropeanParliamentMCPClient } from '../../mcp/ep-mcp-client.js';
import { ArticleCategory } from '../../types/index.js';
import type {
LanguageCode,
DateRange,
VotingRecord,
VotingPattern,
VotingAnomaly,
MotionsQuestion,
} from '../../types/index.js';
import { MONTHLY_REVIEW_TITLES, getLocalizedString } from '../../constants/languages.js';
import {
fetchVotingRecords,
fetchVotingPatterns,
fetchMotionsAnomalies,
fetchParliamentaryQuestionsForMotions,
} from '../pipeline/fetch-stage.js';
import { generateMotionsContent } from '../motions-content.js';
import type { ArticleStrategy, ArticleData, ArticleMetadata } from './article-strategy.js';
// ─── Data payload ─────────────────────────────────────────────────────────────
/** Data fetched and pre-processed by {@link MonthlyReviewStrategy} */
export interface MonthlyReviewArticleData extends ArticleData {
/** Review period date range (30 days) */
readonly dateRange: DateRange;
/** Voting records from the review period */
readonly votingRecords: readonly VotingRecord[];
/** Voting patterns analysis */
readonly votingPatterns: readonly VotingPattern[];
/** Detected voting anomalies */
readonly anomalies: readonly VotingAnomaly[];
/** Parliamentary questions from the period */
readonly questions: readonly MotionsQuestion[];
/** Start date string for display */
readonly dateFromStr: string;
/** Display label for the review month */
readonly monthLabel: string;
}
/** Keywords shared by all Monthly Review articles */
const MONTHLY_REVIEW_KEYWORDS = [
'European Parliament',
'monthly review',
'legislative output',
'coalition dynamics',
] as const;
// ─── Date-range helper ────────────────────────────────────────────────────────
/**
* Compute the review period covering the 30 days ending on `baseDate`.
*
* @param baseDate - ISO 8601 publication date (YYYY-MM-DD)
* @returns Date range covering the past 30 days
*/
function computeMonthlyReviewDateRange(baseDate: string): DateRange {
const end = new Date(`${baseDate}T00:00:00Z`);
const start = new Date(end);
start.setUTCDate(end.getUTCDate() - 30);
const startParts = start.toISOString().split('T');
const endParts = end.toISOString().split('T');
Iif (!startParts[0] || !endParts[0]) {
throw new Error('Invalid date format generated in computeMonthlyReviewDateRange');
}
return {
start: startParts[0],
end: endParts[0],
};
}
/**
* Format a month label from a date string (e.g. "February 2026").
*
* @param dateStr - ISO 8601 date
* @returns Human-readable month label, using the runtime's default locale
*/
function formatMonthLabel(dateStr: string): string {
const date = new Date(`${dateStr}T00:00:00Z`);
return date.toLocaleDateString(undefined, { month: 'long', year: 'numeric', timeZone: 'UTC' });
}
// ─── Strategy implementation ──────────────────────────────────────────────────
/**
* Article strategy for {@link ArticleCategory.MONTH_IN_REVIEW}.
* Fetches voting records, anomalies, patterns, and questions for the
* past 30 days and builds a comprehensive retrospective analysis.
*/
export class MonthlyReviewStrategy implements ArticleStrategy<MonthlyReviewArticleData> {
readonly type = ArticleCategory.MONTH_IN_REVIEW;
readonly requiredMCPTools = [
'get_voting_records',
'analyze_voting_patterns',
'detect_voting_anomalies',
'get_parliamentary_questions',
] as const;
/**
* Fetch monthly review data from MCP.
*
* @param client - MCP client or null
* @param date - ISO 8601 publication date
* @returns Populated monthly review data payload
*/
async fetchData(
client: EuropeanParliamentMCPClient | null,
date: string
): Promise<MonthlyReviewArticleData> {
const dateRange = computeMonthlyReviewDateRange(date);
console.log(` 📊 Monthly review range: ${dateRange.start} to ${dateRange.end}`);
const [votingRecords, votingPatterns, anomalies, questions] = await Promise.all([
fetchVotingRecords(client, dateRange.start, dateRange.end),
fetchVotingPatterns(client, dateRange.start, dateRange.end),
fetchMotionsAnomalies(client, dateRange.start, dateRange.end),
fetchParliamentaryQuestionsForMotions(client, dateRange.start, dateRange.end),
]);
const monthLabel = formatMonthLabel(dateRange.start);
return {
date,
dateRange,
dateFromStr: dateRange.start,
votingRecords,
votingPatterns,
anomalies,
questions,
monthLabel,
};
}
/**
* Build the monthly review HTML body for the specified language.
*
* @param data - Monthly review data payload
* @param lang - Target language code used for editorial strings
* @returns Article HTML body
*/
buildContent(data: MonthlyReviewArticleData, lang: LanguageCode): string {
return generateMotionsContent(
data.dateRange.start,
data.dateRange.end,
[...data.votingRecords],
[...data.votingPatterns],
[...data.anomalies],
[...data.questions],
lang
);
}
/**
* Return language-specific metadata for the monthly review article.
*
* @param data - Monthly review data payload
* @param lang - Target language code
* @returns Localised metadata
*/
getMetadata(data: MonthlyReviewArticleData, lang: LanguageCode): ArticleMetadata {
const titleFn = getLocalizedString(MONTHLY_REVIEW_TITLES, lang);
const { title, subtitle } = titleFn(data.monthLabel);
return {
title,
subtitle,
keywords: [...MONTHLY_REVIEW_KEYWORDS],
category: ArticleCategory.MONTH_IN_REVIEW,
sources: [],
};
}
}
/** Singleton instance for use by the strategy registry */
export const monthlyReviewStrategy = new MonthlyReviewStrategy();
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