'use client';
import { useEffect } from 'react';
import { gtag } from '../consent/googleConsent.js';
import { CONSENT_COOKIE, DEFAULT_CONSENT, parseConsent, setDefaultConsent } from '../consent/index.js';
const GTM_SCRIPT = (id)=>`https://www.googletagmanager.com/gtm.js?id=${id}`;
const GA4_SCRIPT = (id)=>`https://www.googletagmanager.com/gtag/js?id=${id}`;
/** Reads the current consent state from cookie, or defaults if none. */ function readConsent() {
    if (typeof document === 'undefined') {
        return DEFAULT_CONSENT;
    }
    const raw = document.cookie.split('; ').find((c)=>c.startsWith(`${CONSENT_COOKIE}=`))?.split('=')[1];
    return parseConsent(raw) ?? DEFAULT_CONSENT;
}
function injectScript(src) {
    if (document.querySelector(`script[src="${src}"]`)) {
        return;
    }
    const s = document.createElement('script');
    s.src = src;
    s.async = true;
    document.head.appendChild(s);
}
/**
 * Loads Google Analytics — GTM if a container ID is set, otherwise GA4 gtag.
 *
 * Consent Mode is initialised to the visitor's stored consent BEFORE the tag
 * loads (via setDefaultConsent from the consent module), so tags respect the
 * choice from the first hit; useConsent sends an update the moment the visitor
 * decides. IDs are public and come from SiteIntegrations, passed in as props
 * (the client project reads them server-side).
 *
 * Renders nothing — it only injects the scripts. Mount once, high in the tree
 * (e.g. root layout), inside ConsentProvider.
 */ export function Analytics({ ga4MeasurementId, gtmContainerId }) {
    useEffect(()=>{
        if (!ga4MeasurementId && !gtmContainerId) {
            return;
        }
        // 1. Consent Mode default = the visitor's stored choice, before tags load.
        setDefaultConsent(readConsent());
        // 2. Load the tag.
        if (gtmContainerId) {
            window.dataLayer = window.dataLayer || [];
            window.dataLayer.push({
                event: 'gtm.js',
                'gtm.start': Date.now()
            });
            injectScript(GTM_SCRIPT(gtmContainerId));
        } else if (ga4MeasurementId) {
            injectScript(GA4_SCRIPT(ga4MeasurementId));
            // Uses the shared gtag (pushes `arguments`, as Google's tags expect);
            // real gtag.js wires itself up once the script loads.
            gtag('js', new Date());
            gtag('config', ga4MeasurementId);
        }
    }, [
        ga4MeasurementId,
        gtmContainerId
    ]);
    return null;
} //# sourceMappingURL=Analytics.js.map

//# sourceMappingURL=Analytics.js.map