/**
 * Fusion Technician Portal - Push Notification Registration
 * Registers service worker and subscribes to push notifications.
 * Include this script on technician portal pages.
 */

(function() {
    'use strict';

    // Only run on technician portal pages
    if (!document.querySelector('.tech-portal') && !window.location.pathname.startsWith('/my/technician')) {
        return;
    }

    // Get VAPID public key from meta tag or page data
    var vapidMeta = document.querySelector('meta[name="vapid-public-key"]');
    var vapidPublicKey = vapidMeta ? vapidMeta.content : null;

    if (!vapidPublicKey || !('serviceWorker' in navigator) || !('PushManager' in window)) {
        return;
    }

    function urlBase64ToUint8Array(base64String) {
        var padding = '='.repeat((4 - base64String.length % 4) % 4);
        var base64 = (base64String + padding).replace(/-/g, '+').replace(/_/g, '/');
        var rawData = window.atob(base64);
        var outputArray = new Uint8Array(rawData.length);
        for (var i = 0; i < rawData.length; ++i) {
            outputArray[i] = rawData.charCodeAt(i);
        }
        return outputArray;
    }

    async function registerPushSubscription() {
        try {
            // Register service worker
            var registration = await navigator.serviceWorker.register(
                '/fusion_portal/static/src/js/technician_sw.js',
                {scope: '/my/technician/'}
            );

            // Wait for service worker to be ready
            await navigator.serviceWorker.ready;

            // Check existing subscription
            var subscription = await registration.pushManager.getSubscription();

            if (!subscription) {
                // Request permission
                var permission = await Notification.requestPermission();
                if (permission !== 'granted') {
                    console.log('[TechPush] Notification permission denied');
                    return;
                }

                // Subscribe
                subscription = await registration.pushManager.subscribe({
                    userVisibleOnly: true,
                    applicationServerKey: urlBase64ToUint8Array(vapidPublicKey),
                });
            }

            // Send subscription to server
            var key = subscription.getKey('p256dh');
            var auth = subscription.getKey('auth');

            var response = await fetch('/my/technician/push/subscribe', {
                method: 'POST',
                headers: {'Content-Type': 'application/json'},
                body: JSON.stringify({
                    jsonrpc: '2.0',
                    method: 'call',
                    params: {
                        endpoint: subscription.endpoint,
                        p256dh: btoa(String.fromCharCode.apply(null, new Uint8Array(key))),
                        auth: btoa(String.fromCharCode.apply(null, new Uint8Array(auth))),
                    }
                }),
            });

            var data = await response.json();
            if (data.result && data.result.success) {
                console.log('[TechPush] Push subscription registered successfully');
            }
        } catch (error) {
            console.warn('[TechPush] Push registration failed:', error);
        }
    }

    // Register after page load
    if (document.readyState === 'complete') {
        registerPushSubscription();
    } else {
        window.addEventListener('load', registerPushSubscription);
    }
})();