#!/usr/bin/env node

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

function computeAveragePerMonth(articles) {
    let first = null;
    let last = null;

    for (const article of articles) {
        if (!article.date) continue;
        if (!first || article.date < first) first = article.date;
        if (!last || article.date > last) last = article.date;
    }

    if (!first || !last) {
        return { average: 0, months: 0 };
    }

    const monthSpan = Math.max(1, Math.round(last.diff(first.startOf("month"), "months").months) + 1);
    const total = articles.filter((a) => a.date).length;
    const average = total / monthSpan;

    return { average, months: monthSpan };
}

async function run({ contentDir }) {
    const articles = await loadArticles(contentDir || "content");
    const { average, months } = computeAveragePerMonth(articles);
    return { value: average.toFixed(2), meta: { months } };
}

module.exports = { run };