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// SPDX-License-Identifier: Apache-2.0
/**
* @module Generators/Strategies/MonthAheadStrategy
* @description Article strategy for the Month Ahead article type.
* Fetches plenary sessions, committee meetings, documents, and legislative
* pipeline data for the upcoming 30 days, then renders a forward-looking
* strategic outlook article.
*/
import type { EuropeanParliamentMCPClient } from '../../mcp/ep-mcp-client.js';
import { ArticleCategory } from '../../types/index.js';
import type { LanguageCode, DateRange, WeekAheadData } from '../../types/index.js';
import { MONTH_AHEAD_TITLES, getLocalizedString } from '../../constants/languages.js';
import { fetchWeekAheadData } from '../pipeline/fetch-stage.js';
import { buildWeekAheadContent, buildKeywords } from '../week-ahead-content.js';
import type { ArticleStrategy, ArticleData, ArticleMetadata } from './article-strategy.js';
// ─── Data payload ─────────────────────────────────────────────────────────────
/** Data fetched and pre-processed by {@link MonthAheadStrategy} */
export interface MonthAheadArticleData extends ArticleData {
/** Month-ahead date range (30 days) */
readonly dateRange: DateRange;
/** Aggregated month-ahead domain data */
readonly monthData: WeekAheadData;
/** SEO keywords derived from the data */
readonly keywords: readonly string[];
/** Display label for the target month */
readonly monthLabel: string;
}
/** Keywords shared by all Month Ahead articles */
const MONTH_AHEAD_KEYWORDS = [
'European Parliament',
'month ahead',
'strategic outlook',
'legislative calendar',
] as const;
// ─── Date-range helper ────────────────────────────────────────────────────────
/**
* Compute the month-ahead date range spanning 30 days from the day after `baseDate`.
*
* @param baseDate - ISO 8601 publication date (YYYY-MM-DD)
* @returns Date range spanning the next 30 days
*/
function computeMonthAheadDateRange(baseDate: string): DateRange {
const base = new Date(`${baseDate}T00:00:00Z`);
const startDate = new Date(base);
startDate.setUTCDate(base.getUTCDate() + 1);
const endDate = new Date(startDate);
endDate.setUTCDate(startDate.getUTCDate() + 30);
const startParts = startDate.toISOString().split('T');
const endParts = endDate.toISOString().split('T');
Iif (!startParts[0] || !endParts[0]) {
throw new Error('Invalid date format generated in computeMonthAheadDateRange');
}
return {
start: startParts[0],
end: endParts[0],
};
}
/**
* Format a month label from a date string (e.g. "February 2026").
*
* @param dateStr - ISO 8601 date
* @returns Human-readable month label, using the runtime's default locale
*/
function formatMonthLabel(dateStr: string): string {
const date = new Date(`${dateStr}T00:00:00Z`);
return date.toLocaleDateString(undefined, { month: 'long', year: 'numeric', timeZone: 'UTC' });
}
// ─── Strategy implementation ──────────────────────────────────────────────────
/**
* Article strategy for {@link ArticleCategory.MONTH_AHEAD}.
* Fetches plenary, committee, document, and pipeline data then builds
* a forward-looking 30-day strategic outlook of parliamentary activity.
*/
export class MonthAheadStrategy implements ArticleStrategy<MonthAheadArticleData> {
readonly type = ArticleCategory.MONTH_AHEAD;
readonly requiredMCPTools = [
'get_plenary_sessions',
'get_committee_info',
'search_documents',
'monitor_legislative_pipeline',
'get_parliamentary_questions',
'get_events',
] as const;
/**
* Fetch month-ahead data from MCP.
*
* @param client - MCP client or null
* @param date - ISO 8601 publication date
* @returns Populated month-ahead data payload
*/
async fetchData(
client: EuropeanParliamentMCPClient | null,
date: string
): Promise<MonthAheadArticleData> {
const dateRange = computeMonthAheadDateRange(date);
console.log(` 📆 Month-ahead range: ${dateRange.start} to ${dateRange.end}`);
const monthData = await fetchWeekAheadData(client, dateRange);
const keywords = [...MONTH_AHEAD_KEYWORDS, ...buildKeywords(monthData)];
const monthLabel = formatMonthLabel(dateRange.start);
return { date, dateRange, monthData, keywords, monthLabel };
}
/**
* Build the month-ahead HTML body for the specified language.
*
* @param data - Month-ahead data payload
* @param lang - Target language code used for editorial strings
* @returns Article HTML body
*/
buildContent(data: MonthAheadArticleData, lang: LanguageCode): string {
const base = buildWeekAheadContent(data.monthData, data.dateRange, lang);
return base.replace('<!-- /article-content -->', '');
}
/**
* Return language-specific metadata for the month-ahead article.
*
* @param data - Month-ahead data payload
* @param lang - Target language code
* @returns Localised metadata
*/
getMetadata(data: MonthAheadArticleData, lang: LanguageCode): ArticleMetadata {
const titleFn = getLocalizedString(MONTH_AHEAD_TITLES, lang);
const { title, subtitle } = titleFn(data.monthLabel);
return {
title,
subtitle,
keywords: data.keywords,
category: ArticleCategory.MONTH_AHEAD,
sources: [],
};
}
}
/** Singleton instance for use by the strategy registry */
export const monthAheadStrategy = new MonthAheadStrategy();
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