// Simple analytics tracking for ISSINFO.NET
// This script tracks page views and sends them to our analytics API

(function() {
    'use strict';

    // Generate a session ID for this browser session
    function generateSessionId() {
        let sessionId = sessionStorage.getItem('session_id');
        if (!sessionId) {
            sessionId = 'sess_' + Math.random().toString(36).substr(2, 9) + '_' + Date.now();
            sessionStorage.setItem('session_id', sessionId);
        }
        return sessionId;
    }

    // Get current page path
    function getCurrentPage() {
        return window.location.pathname;
    }

    // Get referrer (cleaned up)
    function getReferrer() {
        const referrer = document.referrer;
        if (!referrer) return '';
        try {
            const referrerUrl = new URL(referrer);
            // Don't track internal referrals
            if (referrerUrl.hostname === window.location.hostname) {
                return '';
            }
            return referrerUrl.hostname;
        } catch (e) {
            return '';
        }
    }

    // Get user agent
    function getUserAgent() {
        return navigator.userAgent;
    }

    // Get screen resolution
    function getScreenResolution() {
        return screen.width + 'x' + screen.height;
    }

    // Get user's location (with permission)
    function getUserLocation() {
        return new Promise((resolve) => {
            // Don't request GPS location - rely on IP-based geolocation instead
            resolve({ latitude: 0, longitude: 0 });
        });
    }

    // Track page view
    async function trackPageView(heartbeat = false) {
        try {
            const location = await getUserLocation();
            
            const data = {
                sessionId: generateSessionId(),
                page: getCurrentPage(),
                referrer: getReferrer(),
                userAgent: getUserAgent(),
                screen_resolution: getScreenResolution(),
                timestamp: new Date().toISOString(),
                latitude: location.latitude,
                longitude: location.longitude,
                heartbeat: heartbeat
            };

            // Send to analytics API
            fetch('/api/analytics/track', {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                },
                body: JSON.stringify(data)
            }).catch(err => {
                // Silently fail - don't block the page
                console.debug('Analytics tracking failed:', err);
            });
        } catch (error) {
            console.debug('Analytics error:', error);
        }
    }

    // Track initial page view
    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', () => trackPageView());
    } else {
        trackPageView();
    }

    // Track heartbeat every 30 seconds to show active sessions
    setInterval(() => {
        trackPageView(true);
    }, 30000);

    // Track page visibility changes
    document.addEventListener('visibilitychange', () => {
        if (!document.hidden) {
            trackPageView(true);
        }
    });

})();