#!/usr/bin/env node

const fs = require("fs/promises");
const { renderChart, makeBarConfig } = require("../lib/stats/charts");
const { fetchGoAccessJson, groupVisitsByMonth } = require("../lib/stats/goaccess");
const { loadToolsConfig } = require("../lib/config");

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

    const toolsConfig = await loadToolsConfig();
    const url = stat.url || toolsConfig.goaccess?.url || "";
    const data = await fetchGoAccessJson(url);
    const months = groupVisitsByMonth(data, { adjustCrawlers: true });

    const labels = months.map((entry) => entry.month);
    const values = months.map((entry) => entry.visitors);

    const buffer = await renderChart(
        makeBarConfig({
            labels,
            data: values,
            title: "Visiteurs uniques par mois (hors crawlers)",
            color: "rgba(239, 68, 68, 0.8)",
        }),
    );

    await fs.writeFile(outputPath, buffer);

    const latest = months[months.length - 1];

    return {
        image: publicPath,
        meta: {
            month: latest?.month || null,
            visitors: latest?.visitors || 0,
        },
    };
}

module.exports = { run };