#!/usr/bin/env node

const { fetchGoAccessJson, aggregateLastNDays } = require("../lib/stats/goaccess");
const { loadToolsConfig } = require("../lib/config");

let cache = null;

async function loadData(url) {
    if (!cache) {
        cache = await fetchGoAccessJson(url);
    }
    return cache;
}

function latestMonthEntry(months) {
    if (!months || months.length === 0) return null;
    return months[months.length - 1];
}

async function run({ stat }) {
    const toolsConfig = await loadToolsConfig();
    const url = stat.url || toolsConfig.goaccess?.url || "";
    const metric = stat.metric || "hits";
    const windowDays = Number.isFinite(stat.days) ? stat.days : 30;
    const data = await loadData(url);
    const window = aggregateLastNDays(data, windowDays, { adjustCrawlers: true });
    if (!window || !window.to) return { value: 0 };

    const value = metric === "visitors" ? window.visitors : window.hits;
    return {
        value,
        meta: {
            from: window.from || null,
            to: window.to || null,
            days: windowDays,
            metric,
            raw: value,
        },
    };
}

module.exports = { run };