/* Geonet Console — PWA service worker (Fase B: install + login shell cache) */
var CACHE_VERSION = 'geonet-console-v3';
var PRECACHE_URLS = [
    '/offline.html',
    '/css/app-ui.css',
    '/js/theme-init.js',
    '/js/theme.js',
    '/js/pwa-register.js',
    '/js/pwa-install.js',
    '/js/pwa-login-shell.js',
    '/js/ui-feedback.js',
    '/icons/icon.svg',
    '/icons/icon-maskable.svg',
    '/manifest.webmanifest'
];

var LOGIN_SHELL_PATHS = ['/login', '/password/forgot'];

function shouldSkip(request) {
    if (request.method !== 'GET') {
        return true;
    }

    var url = new URL(request.url);

    if (url.origin !== self.location.origin) {
        return true;
    }

    if (url.pathname.indexOf('/api/') === 0) {
        return true;
    }

    if (url.pathname.indexOf('/audit/') === 0) {
        return true;
    }

    if (url.pathname.indexOf('/oauth/') === 0) {
        return true;
    }

    return false;
}

function isNavigation(request) {
    if (request.mode === 'navigate') {
        return true;
    }

    var accept = request.headers.get('accept') || '';
    return accept.indexOf('text/html') !== -1;
}

function isLoginShellPath(pathname) {
    var path = pathname.replace(/\/$/, '') || '/';
    return LOGIN_SHELL_PATHS.indexOf(path) !== -1;
}

function isStaticAsset(pathname) {
    return /\.(css|js|svg|webmanifest|png|jpg|jpeg|webp|woff2?)$/i.test(pathname)
        || pathname === '/offline.html'
        || pathname === '/manifest.webmanifest';
}

function staleWhileRevalidate(request) {
    return caches.open(CACHE_VERSION).then(function (cache) {
        return cache.match(request).then(function (cached) {
            var networkFetch = fetch(request).then(function (response) {
                if (response && response.status === 200) {
                    cache.put(request, response.clone());
                }
                return response;
            }).catch(function () {
                return null;
            });

            if (cached) {
                networkFetch.then(function () {});
                return cached;
            }

            return networkFetch.then(function (response) {
                return response || caches.match('/offline.html');
            });
        });
    });
}

self.addEventListener('install', function (event) {
    event.waitUntil(
        caches.open(CACHE_VERSION).then(function (cache) {
            return cache.addAll(PRECACHE_URLS);
        }).then(function () {
            return self.skipWaiting();
        })
    );
});

self.addEventListener('activate', function (event) {
    event.waitUntil(
        caches.keys().then(function (keys) {
            return Promise.all(
                keys.filter(function (key) {
                    return key.indexOf('geonet-console-') === 0 && key !== CACHE_VERSION;
                }).map(function (key) {
                    return caches.delete(key);
                })
            );
        }).then(function () {
            return self.clients.claim();
        })
    );
});

self.addEventListener('fetch', function (event) {
    var request = event.request;

    if (shouldSkip(request)) {
        return;
    }

    var url = new URL(request.url);

    if (isNavigation(request)) {
        if (isLoginShellPath(url.pathname)) {
            event.respondWith(staleWhileRevalidate(request));
            return;
        }

        event.respondWith(
            fetch(request).catch(function () {
                return caches.match('/offline.html');
            })
        );
        return;
    }

    if (isStaticAsset(url.pathname)) {
        event.respondWith(
            caches.match(request).then(function (cached) {
                var networkFetch = fetch(request).then(function (response) {
                    if (response && response.status === 200) {
                        var copy = response.clone();
                        caches.open(CACHE_VERSION).then(function (cache) {
                            cache.put(request, copy);
                        });
                    }
                    return response;
                });

                return cached || networkFetch;
            })
        );
    }
});