//importScripts('lib/localforage.min.js');

var CACHE_NAME = 'epube-v1';

self.addEventListener('install', function(event) {
  event.waitUntil(
    caches.open(CACHE_NAME).then(function(cache) {
		var urls = [
			'read.html',
			'js/common.js',
			'js/read.js',
			'js/offline.js',
			'js/swipes.js',
			'js/dict.js',
			'css/read.css',
			'css/reader.css',
			'css/index.css',
			'css/transitions.css',
			'offline.html',
			'themes/default.css',
			'themes/mocca.css',
			'themes/night.css',
			'themes/plan9.css',
			'lib/promise.js',
			'lib/fetch.js',
			'lib/zip.min.js',
			'lib/epub.js',
			'lib/localforage.min.js',
			'lib/holder.min.js',
			'lib/smartimages.js',
			'lib/jquery.mobile.custom.js',
			'lib/bootstrap/v3/css/bootstrap-theme.min.css',
			'lib/bootstrap/v3/css/bootstrap.min.css',
			'lib/bootstrap/v3/js/jquery.js',
			'lib/bootstrap/v3/js/bootstrap.min.js',
			'lib/bootstrap/v3/fonts/glyphicons-halflings-regular.woff2',
			'lib/qtip2/jquery.qtip.min.css',
			'lib/qtip2/jquery.qtip.min.js',
		];

		return cache.addAll(urls.map(url => new Request(url, {credentials: 'same-origin'})));
    })
  );
});

function send_message(client, msg) {
	client.postMessage(msg);
}

function send_broadcast(msg) {
	clients.matchAll().then(clients => {
		clients.forEach(client => {
			send_message(client, msg);
		})
	})
}

self.addEventListener('message', function(event){
	if (event.data == 'refresh-cache') {
		console.log("refreshing cache...");

		caches.open(CACHE_NAME).then(function(cache) {
			var promises = [];

			cache.keys().then(function(keys) {
				for (var i = 0; i < keys.length; i++) {

					if (keys[i].url.match("backend.php"))
						continue;

					//console.log(keys[i]);

					var promise = fetch(keys[i]).then(function(resp) {
						if (resp.status == 200) {
							cache.put(resp.url, resp);
						} else if (resp.status == 404) {
							cache.delete(resp.url);
						}
					});

					promises.push(promise);

				}
			});

			Promise.all(promises).then(function() {
				console.log('all done');
				send_broadcast('client-reload');
			});

		});
	}
});

this.addEventListener('fetch', function(event) {
	var req = event.request.clone();

	event.respondWith(
		caches.match(req).then(function(resp) {

			if (resp) {
				return resp;
			}

			if (req.url.match("read.html")) {
				return caches.match("read.html");
			}

			if (req.url.match("offline.html")) {
				return caches.match("offline.html");
			}

			return fetch(req).then(function(resp) {

				if (resp.status == 200) {
					if (resp.url.match("backend.php\\?op=(cover|getinfo)")) {
						return caches.open(CACHE_NAME).then(function(cache) {
							cache.put(resp.url, resp.clone());
							return resp;
						});
					}
				}

				return resp;
			}).catch(function() {
				if (req.url[req.url.length-1] == "/" || req.url.match("index.php")) {
					return caches.match("offline.html");
				}
			});
		})
	);
});