// abhsplit-tracker.js
(function() {
    const ABHSPLIT_SERVER = 'https://advancedbiohealth.com/AbhSplit';
    
    function generateUUID() {
        const uuid = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
            var r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8);
            return v.toString(16);
        });
        console.log('Generated UUID:', uuid);
        return uuid;
    }

    function getOrCreateVisitorId(pageType) {
        let visitorId = localStorage.getItem('abhsplit_visitor_id');
        console.log('Existing visitor ID from localStorage:', visitorId);
        
        // Only generate new ID if it's a landing page and no ID exists
        if (!visitorId && pageType === 'landing') {
            visitorId = generateUUID();
            localStorage.setItem('abhsplit_visitor_id', visitorId);
            console.log('Created new visitor ID:', visitorId);
        }
        
        return visitorId;
    }

    function setCookie(name, value, days) {
        let expires = '';
        if (days) {
            const date = new Date();
            date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
            expires = '; expires=' + date.toUTCString();
        }
        document.cookie = name + '=' + (value || '') + expires + '; path=/; Secure; SameSite=Lax';
        console.log(`Cookie set: ${name}=${value}`);
    }

    async function trackPageView(experimentId, pageType) {
        console.log('TrackPageView called with:', { experimentId, pageType });
        
        const visitorId = getOrCreateVisitorId(pageType);
        
        // If this is an upsell page and no visitor ID exists, it's a direct visit - ignore it
        if (pageType === 'upsell' && !visitorId) {
            console.log('Direct upsell page visit detected - tracking aborted');
            return;
        }
        
        console.log('Active visitor ID:', visitorId);
        
        // Check if we already have a version assigned
        const existingVersion = localStorage.getItem('abhsplit_version_' + experimentId);
        console.log('Existing version:', existingVersion);
        
        // Store experiment info only if we have a valid visitor ID
        if (visitorId) {
            localStorage.setItem('abhsplit_experiment_' + experimentId, visitorId);
            setCookie('abhsplit_exp_' + experimentId, visitorId, 365);
        }

        const currentUrl = window.location.href;
        console.log('Current URL:', currentUrl);

        try {
            console.log('Sending request to server...');
            const response = await fetch(`${ABHSPLIT_SERVER}/track.php`, {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                },
                body: JSON.stringify({
                    visitor_id: visitorId,
                    experiment_id: experimentId,
                    page_type: pageType,
                    url: currentUrl,
                    existing_version: existingVersion || null
                }),
                credentials: 'include'
            });

            const data = await response.json();
            console.log('Server response:', data);

            if (data.success) {
				window.isRedirect = false;
                // Store the assigned version only if we have a valid visitor ID
                if (visitorId) {
                    localStorage.setItem('abhsplit_version_' + experimentId, data.version);
                    setCookie('abhsplit_ver_' + experimentId, data.version, 365);
                }
                
                // Only handle redirects for landing pages
                if (pageType === 'landing' && data.version === 'variant' && data.redirect_url && currentUrl !== data.redirect_url) {
                    console.log('Redirecting to variant:', data.redirect_url);
					window.isRedirect = true;
					console.log('Setting isRedirect flag to true');					
                    // Use replace to avoid breaking the back button
                    window.location.replace(data.redirect_url);
                } else {
                    console.log('No redirect needed. Version:', data.version);
                }
            } else {
                console.error('Server returned error:', data.error);
            }
        } catch (error) {
            console.error('AbhSplit tracking error:', error);
        }
    }

    // Expose globally
    window.AbhSplit = {
        track: trackPageView
    };

    console.log('AbhSplit tracker initialized');
})();