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debris-slide.js
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debris-slide.js
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const StoredObjectFactory = (args) => {
return new Proxy(args.type, {
construct: (target, [options]) => {
let instance = new args.type(args.parse(options.storage.getItem(options.key)));
args.mutables.map(m => args.type.prototype[m]).forEach(method => {
instance[method.name] = function () {
let result = method.bind(instance)(...arguments);
options.storage.setItem(options.key, args.stringify(instance)); // make this async?
return result;
};
});
return new Proxy(instance, {
get: (obj, prop) => {
if (typeof obj[prop] === "function") return obj[prop].bind(obj);
else return obj[prop];
}
});
}
});
};
class StoredLog {
constructor(options) { this.map = new StoredMap(options) }
add(item, timestamp = new Date()) { this.map.set(timestamp, item) }
entries() { return this.map.entries() }
}
const StoredMap = StoredObjectFactory({
mutables: ['clear', 'delete', 'set'],
parse: function (string) { return JSON.parse(string || '[]') },
stringify: function (map) { return JSON.stringify(Array.from(map)) },
type: Map
});
class StoredQueue {
constructor(options) { this.map = new StoredMap(options) }
enqueue(item, index = (new Date().getTime())) {
while (this.map.has(index)) index += 1; // silly hack
return this.map.set(index, item);
}
dequeue() {
let iter = this.map.entries().next();
if (iter.done) return;
let [index, value] = iter.value;
this.map.delete(index);
return value;
}
peek() {
let iter = this.map.entries().next();
if (iter.done) return;
return iter.value[1];
}
}
const StoredSet = StoredObjectFactory({
mutables: ['add', 'clear', 'delete'],
parse: function (string) { return JSON.parse(string || '[]') },
stringify: function (set) { return JSON.stringify(Array.from(set)) },
type: Set
});
class DebrisLibrary {
constructor(key = "debris-lib", store = window.localStorage) {
this.key = key
this.store = store;
}
toArray() { return JSON.parse(this.store.getItem(this.key) || '[]') }
toSet() { return new Set(this.toArray()) }
add(item) {
let set = this.toSet();
set.add(item);
this.store.setItem(this.key, JSON.stringify(Array.from(set)));
}
delete(item) {
let set = this.toSet();
set.delete(item);
this.store.setItem(this.key, JSON.stringify(Array.from(set)));
}
}
class DebrisTrack {
constructor(args) {
if (typeof(args) == "string") {
this.url = url;
this.hasTags = false;
this.storeTags();
}
else if (typeof(args) == "object") {
this.url = args.url;
this.album = args.album;
this.artist = args.artist;
this.track = args.track;
this.hasTags = true;
}
else {
throw "argument must either be a string or an object";
}
}
storeTags() {
let self = this;
this.fetchTags().then(result => {
self.album = result.tags.album;
self.artist = result.tags.artist;
self.track = result.tags.track;
self.hasTags = true;
});
}
async fetchTags() {
let url = this.url;
return new Promise((resolve, reject) => {
jsmediatags.read(url, { onSuccess: resolve, onError: reject });
});
}
toString() {
return this.url;
}
}
// The play queue is where the "next" always comes from. This is a StoredQueue.
// When something is played, it's pushed to the log right at the start. This is a StoredLog.
// The play list is just an Array. Logic goes like this:
// Hit play. Pull the next track from the StoredQueue. Push it to the StoredLog and playList.
// If the user hits backwards, go backward in the playList, play it and push it to the StoredLog
// If the user hits forward:
// If there's something "next" in the playList, play it and push it to the StoredLog
// If there's nothing "next":
// Grab the "next" from the StoredQueue
// If there's nothing "next" do nothing
// Else push it to the StoreLog and playList and play it
class DebrisPlayer {
constructor(element, playQueue, playLog) {
this.element = element;
this.playQueue = playQueue;
this.playLog = playLog;
this.playList = [];
this.playPosition = -1;
this.stopPlaying = false;
this.initEventHandlers();
}
initEventHandlers() {
let self = this;
this.element.addEventListener('ended', (event) => {
if (self.stopPlaying) {
self.stopPlaying = false;
console.debug('Stopping the playlist');
}
else self.playNext();
});
this.element.addEventListener('onchange', (event) => {
console.log("change!", event.target.src)
});
let srcObserver = new MutationObserver((mutations, observer) => {
mutations.forEach(mutation => {
document.getElementById('track_url').innerText = mutation.target.src;
});
});
srcObserver.observe(this.element, { attributes: true });
this.element.addEventListener('timeupdate', (event) => {
document.getElementById('current_time').innerText = event.target.currentTime;
});
this.element.addEventListener('volumechange', (event) => {
document.getElementById('volume').innerText = event.target.volume;
});
}
get currentTrack() {
if (this.playPosition >= 0) return this.playList[this.playPosition];
}
playNext(delta) {
delta ||= 1
if (!this.playList[this.playPosition + delta]) { // TODO: this really only works for delta == 1
let nextEntry = this.playQueue.dequeue();
if (nextEntry) this.playList.push(nextEntry)
else return console.debug('the playQueue is empty!');
}
let playListLength = this.playList.length;
this.playPosition += delta;
let nextTrack = this.playList[this.playPosition];
this.element.src = nextTrack;
this.playLog.add(nextTrack);
console.debug(`Now playing ${nextTrack}`);
}
}
window.addEventListener('load', (event) => {
let log = new StoredLog({ key: "debrisLog", storage: window.localStorage });
let queue = new StoredQueue({ key: "debrisQueue", storage: window.localStorage });
window.player = new DebrisPlayer(document.getElementById("player"), queue, log);
});