/**
 * CSA Advisory - Advanced Consent Manager (Google v2 + Audit)
 * * ARCHITECTURE:
 * 1. Default: All Google Tags are blocked (Denied).
 * 2. Interaction: User accepts via Banner.
 * 3. Action A (Marketing): Calls gtag('update', 'granted') -> Fires GA4/Ads.
 * 4. Action B (Legal): Sends Audit Log to Compliance API (Port 5007).
 */

const CONSENT_API = "http://localhost:5007/api/v1/audit/consent"; 
const COOKIE_NAME = "csa_consent_v2";

const CookieManager = {
    init: function() {
        // Check LocalStorage
        const saved = localStorage.getItem(COOKIE_NAME);
        if (!saved) {
            this.showBanner();
        } else {
            const consent = JSON.parse(saved);
            // Re-apply consent on every page load to ensure GTM catches it
            this.updateGoogle(consent.status);
        }
    },

    showBanner: function() {
        if(document.getElementById('csa-cookie-banner')) return;

        const banner = document.createElement('div');
        banner.id = 'csa-cookie-banner';
        banner.className = 'fixed-bottom bg-white border-top shadow-lg p-4 animate__animated animate__slideInUp';
        banner.style.zIndex = '99999';
        banner.innerHTML = `
            <div class="container">
                <div class="row align-items-center">
                    <div class="col-lg-8 mb-3 mb-lg-0">
                        <h5 class="fw-bold text-navy"><i class="fas fa-user-shield text-warning me-2"></i>Privacy Settings</h5>
                        <p class="small text-muted mb-0">
                            We use cookies to analyze traffic and personalize content (Google Ads/GA4). 
                            By clicking "Accept All", you consent to the use of all cookies and the transfer of data to Google.
                            We log your consent for legal compliance.
                            <a href="/legal.html#cookies" class="text-decoration-underline text-dark">Read Policy</a>.
                        </p>
                    </div>
                    <div class="col-lg-4 text-end d-flex gap-2 justify-content-end">
                        <button onclick="CookieManager.denyAll()" class="btn btn-outline-secondary btn-sm">Reject All</button>
                        <button onclick="CookieManager.acceptAll()" class="btn btn-dark btn-sm fw-bold px-4">Accept All</button>
                    </div>
                </div>
            </div>
        `;
        document.body.appendChild(banner);
    },

    acceptAll: function() {
        this.updateGoogle('granted');
        this.saveChoice('granted');
        this.logAudit('granted');
        this.hideBanner();
        // TRIGGER GTM EVENT: Needed if GTM is waiting for a custom event
        window.dataLayer.push({'event': 'consent_granted'});
    },

    denyAll: function() {
        this.updateGoogle('denied');
        this.saveChoice('denied');
        this.logAudit('denied');
        this.hideBanner();
    },

    updateGoogle: function(status) {
        console.log(`[CSA Consent] Setting Google Signals to: ${status}`);
        
        // Google Consent Mode v2 Command
        function gtag(){dataLayer.push(arguments);}
        gtag('consent', 'update', {
            'ad_storage': status,
            'ad_user_data': status,
            'ad_personalization': status,
            'analytics_storage': status
        });
    },

    saveChoice: function(status) {
        const data = { 
            status: status, 
            timestamp: new Date().toISOString(), 
            id: crypto.randomUUID() 
        };
        localStorage.setItem(COOKIE_NAME, JSON.stringify(data));
    },

    logAudit: function(status) {
        // Fire-and-forget audit log
        const saved = JSON.parse(localStorage.getItem(COOKIE_NAME));
        if(!saved) return;

        fetch(CONSENT_API, {
            method: 'POST',
            mode: 'cors',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({
                consentId: saved.id,
                status: status,
                userAgent: navigator.userAgent
            })
        }).catch(err => console.warn("Audit log unreachable (Dev Mode?)"));
    },

    hideBanner: function() {
        const el = document.getElementById('csa-cookie-banner');
        if(el) el.remove();
    }
};

document.addEventListener('DOMContentLoaded', () => {
    CookieManager.init();
});