#!/usr/bin/env node

const { loadArticles } = require("../lib/stats/articles");
const { renderWithPython } = require("../lib/stats/python");

function groupByYear(articles) {
    const counts = new Map();
    let first = null;
    let last = null;

    for (const article of articles) {
        if (!article.date) continue;
        const year = article.date.year;
        counts.set(year, (counts.get(year) || 0) + 1);
        if (!first || article.date < first) first = article.date;
        if (!last || article.date > last) last = article.date;
    }

    const entries = Array.from(counts.entries()).sort((a, b) => a[0] - b[0]);
    const labels = entries.map(([year]) => `${year}`);
    const values = entries.map(([, value]) => value);

    return { labels, values, first, last };
}

async function run({ contentDir, outputPath, publicPath }) {
    if (!outputPath) {
        throw new Error("outputPath manquant pour articles_per_year");
    }

    const articles = await loadArticles(contentDir || "content");
    const { labels, values, first, last } = groupByYear(articles);

    await renderWithPython({
        type: "articles_per_year",
        outputPath,
        data: {
            labels,
            values,
            title: "Articles par an",
        },
    });

    return {
        image: publicPath,
        meta: {
            from: first ? first.toISODate() : null,
            to: last ? last.toISODate() : null,
            years: labels.length,
        },
    };
}

module.exports = { run };