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'use strict';
 
var CACHE = 'ttss-app-v1';
var CACHE_RESOURCES = [
    '/version.php',
    '/',
    '/common.js',
    '/index.css',
    '/index.html',
    '/index.js',
    '/lang_en.js',
    '/lang_pl.js',
    '/map.css',
    '/map.html',
    '/map.js',
    '/serviceworker-install.js',
    'https://code.jquery.com/jquery-3.1.1.min.js',
    'https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList',
    'https://openlayers.org/en/v4.1.0/build/ol.js'
];
 
var self = this;
 
this.addEventListener('install', event => {
    event.waitUntil(
        caches.open(CACHE).then(cache => {
            return cache.addAll(CACHE_RESOURCES);
        })
    );
});
 
this.addEventListener('fetch', event => {
    event.respondWith(
        caches.match(event.request).then(response => response || fetch(event.request))
    );
    
    if(event.request.url.endsWith('/version.php')) {
        event.waitUntil(
            Promise.all([
                caches.open(CACHE),
                fetch(event.request)
            ]).then(results => {
                var cache = results[0];
                var v2 = results[1];
                var v2copy = v2.clone();
                
                return Promise.all([
                    cache.match(event.request).then(v1 => v1.json()),
                    v2copy.json()
                ]).then(results => {
                    var v1json = results[0];
                    var v2json = results[1];
                    
                    return updateCache(cache, v1json, v2json).then(_ => cache.put(event.request, v2)).then(function() {
                        console.log('Service Worker: update successful!');
                        self.skipWaiting();
                        postMessage({action: 'updated'});
                    });
                });
            }).catch(function(error) {
                console.log('Service Worker: update failed: ', error);
                postMessage({action: 'updateFailed'});
            })
        );
    }
});
 
this.addEventListener('activate', event => {
    event.waitUntil(
        caches.keys().then(keyList => Promise.all(
            keyList.map(key => {
                if (key != CACHE) {
                    return caches.delete(key);
                }
            })
        )).then(caches.open(CACHE)).then(cache => cache.keys()).then(keys => 
            console.log(keys)
        
            /*Promise.all(
            keys.map(key => {
                console.log(key);
                if(!(key in CACHE_RESOURCES)) {
                    //return cache.delete(key);
                }
            })*/
        )
    );
});
 
function postMessage(message) {
    self.clients.matchAll().then(clients => {
        clients.forEach(client => {
            client.postMessage(message);
        });
    });
}
 
function updateCache(cache, cachedVersion, currentVersion) {
    var remove = [];
    var add = [];
    
    for(var cachedFile in cachedVersion) {
        if(!currentVersion[cachedFile]) {
            remove.push('/' + cachedFile);
        } else if(cachedVersion[cachedFile] != currentVersion[cachedFile]) {
            add.push('/' + cachedFile);
        }
    }
    for(var currentFile in currentVersion) {
        if(CACHE_RESOURCES.indexOf('/' + currentFile) === -1) {
            continue;
        } else if(!cachedVersion[currentFile]) {
            add.push('/' + currentFile);
        }
    }
    
    console.log('Service Worker: updating files: ', add);
    console.log('Service Worker: deleting files: ', remove);
    
    return cache.addAll(add).then(function() {
        return Promise.all(
            remove.map(filename => {
                return caches.delete(filename)
            })
        );
    });
}
 
this.addEventListener('message', function(event) {
    switch(event.data.action) {
        case 'skipWaiting':
            self.skipWaiting();
        break;
    }
});