class LinkBuildingTracker {
    constructor() {
        this.trackingData = JSON.parse(localStorage.getItem('linkTrackingData')) || {};
        this.init();
    }

    init() {
        // Traccia i click sui link esterni
        document.addEventListener('click', (e) => {
            const link = e.target.closest('a');
            if (link && this.isExternalLink(link.href)) {
                this.trackClick(link.href, 'click');
            }
        });

        // Traccia le impression (quando un link entra nella viewport)
        this.trackImpressions();
        
        // Salva i dati periodicamente
        setInterval(() => this.saveData(), 30000);
    }

    isExternalLink(url) {
        try {
            const domain = new URL(url).hostname;
            return domain !== window.location.hostname;
        } catch {
            return false;
        }
    }

    trackClick(url, type = 'click') {
        const domain = new URL(url).hostname;
        
        if (!this.trackingData[domain]) {
            this.trackingData[domain] = {
                clicks: 0,
                impressions: 0,
                lastInteraction: new Date().toISOString(),
                urls: {}
            };
        }

        if (!this.trackingData[domain].urls[url]) {
            this.trackingData[domain].urls[url] = {
                clicks: 0,
                impressions: 0,
                firstSeen: new Date().toISOString()
            };
        }

        this.trackingData[domain].urls[url].clicks++;
        this.trackingData[domain].clicks++;
        this.trackingData[domain].lastInteraction = new Date().toISOString();

        console.log(`Tracked ${type} on: ${url}`);
    }

    trackImpressions() {
        const observer = new IntersectionObserver((entries) => {
            entries.forEach(entry => {
                if (entry.isIntersecting) {
                    const link = entry.target;
                    if (this.isExternalLink(link.href)) {
                        this.trackImpression(link.href);
                    }
                }
            });
        }, { threshold: 0.1 });

        // Osserva tutti i link esterni
        document.querySelectorAll('a[href^="http"]').forEach(link => {
            if (this.isExternalLink(link.href)) {
                observer.observe(link);
            }
        });
    }

    trackImpression(url) {
        const domain = new URL(url).hostname;
        
        if (!this.trackingData[domain]) {
            this.trackingData[domain] = {
                clicks: 0,
                impressions: 0,
                lastInteraction: new Date().toISOString(),
                urls: {}
            };
        }

        if (!this.trackingData[domain].urls[url]) {
            this.trackingData[domain].urls[url] = {
                clicks: 0,
                impressions: 0,
                firstSeen: new Date().toISOString()
            };
        }

        this.trackingData[domain].urls[url].impressions++;
        this.trackingData[domain].impressions++;
    }

    saveData() {
        localStorage.setItem('linkTrackingData', JSON.stringify(this.trackingData));
    }

    getReport() {
        return this.trackingData;
    }

    exportData() {
        return JSON.stringify(this.trackingData, null, 2);
    }
}

// Inizializzazione
const linkTracker = new LinkBuildingTracker();