'use strict';

// Register the service worker
if ('serviceWorker' in navigator) {
    window.addEventListener('load', () => {
        navigator.serviceWorker.register('/service-worker.js')
            .then(registration => {
                console.log('ServiceWorker registration successful with scope: ', registration.scope);
            })
            .catch(err => {
                console.log('ServiceWorker registration failed: ', err);
            });
    });

    // Add message listener for SW communication
    navigator.serviceWorker.addEventListener('message', event => {
        if (event.data && event.data.type === 'SW_VERSION_MISMATCH') {
            console.log('Client received SW_VERSION_MISMATCH message:', event.data.payload);

            const SW_UNREGISTER_THROTTLE_MS = 15 * 60 * 1000; // 15 minutes
            const LAST_ATTEMPT_KEY = 'swLastUnregisterAttempt';

            const lastAttemptTimestamp = localStorage.getItem(LAST_ATTEMPT_KEY);
            const now = Date.now();

            if (lastAttemptTimestamp && (now - parseInt(lastAttemptTimestamp, 10) < SW_UNREGISTER_THROTTLE_MS)) {
                console.warn(`SW version mismatch detected, but throttling unregister attempt. Last attempt was less than ${SW_UNREGISTER_THROTTLE_MS / 1000}s ago.`);
                return; // Throttled
            }

            console.log('SW version mismatch detected. Attempting to unregister service worker and reload.');
            localStorage.setItem(LAST_ATTEMPT_KEY, now.toString());

            navigator.serviceWorker.getRegistration().then(registration => {
                if (registration) {
                    registration.unregister().then(unregistered => {
                        if (unregistered) {
                            console.log('Service worker unregistered successfully.');
                            // Force reload from network, bypassing cache
                            window.location.reload(true);
                        } else {
                            console.error('Failed to unregister service worker.');
                        }
                    }).catch(err => {
                        console.error('Error unregistering service worker:', err);
                    });
                } else {
                    console.warn('No active service worker registration found to unregister.');
                    // Still reload, might fix the issue if registration was stuck
                    window.location.reload(true);
                }
            });
        }
    });
}