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const urlParams = new URLSearchParams(window.location.search);
const currentSide = urlParams.get("side");
const Cassette = new Audio(`audio/2019-mix-side-${currentSide}.mp3`);
let TapeDeck = {
elem: document.getElementById("tape-deck"),
notes: document.getElementById("notes"),
trackData: [],
currentTrackIndex: 0,
hasStarted: false,
isPlaying: false,
images: { stop: "images/cool-deck.png", go: "images/cool-deck.gif" },
go: function () {
this.elem.src = this.images.go;
this.isPlaying = true;
},
stop: function () {
this.elem.src = this.images.stop;
this.isPlaying = false;
},
playButton: {
elem: document.getElementById("play-button"),
state: "off",
up: "images/play-button-up.png",
down: "images/play-button-down.png",
initSound: new Audio("audio/tape-start.mp3"),
pressSound: new Audio("audio/button-press.mp3"),
toggle: function () {
if (this.state === "off") {
this.elem.src = this.down;
this.state = "on";
} else {
this.elem.src = this.up;
this.state = "off";
}
}
}
};
function start() {
const btn = TapeDeck.playButton;
TapeDeck.hasStarted = true;
btn.toggle();
btn.initSound.onended = (event) => { Cassette.play(); };
btn.initSound.play();
}
function pause() {
const btn = TapeDeck.playButton;
btn.toggle();
btn.pressSound.play();
Cassette.pause();
TapeDeck.stop();
}
function resume() {
const btn = TapeDeck.playButton;
btn.pressSound.play();
btn.toggle();
Cassette.play();
}
// button onclick points here
function play() {
if (TapeDeck.isPlaying) { pause(); return; }
TapeDeck.hasStarted ? resume() : start();
TapeDeck.go();
}
function reset() {
Cassette.currentTime = 0;
}
function isLastTrack(current, tracks) {
return current + 1 === tracks.length;
}
function getTrack(time) {
const { currentTrackIndex, trackData } = TapeDeck;
const nextIndex = currentTrackIndex + 1;
const startTimes = trackData.map( t => t.start );
if (isLastTrack(currentTrackIndex, startTimes)) {
return trackData[trackData.length - 1];
} else {
if (time >= startTimes[nextIndex]) {
TapeDeck.currentTrackIndex = nextIndex;
}
return trackData[currentTrackIndex];
}
}
function formatTrackData(track) {
let string = `${track.title} - ${track.artist}`;
if (track.album) {
string = string.concat(` - ${track.album}`);
}
if (track.link) {
string = string.concat(` - ${track.link}`)
}
return string;
}
function loadTrackData() {
fetch(`side${currentSide}.json`)
.then(response => response.json())
.then((data) => {
TapeDeck.trackData = data;
});
}
function resumeMaybe() {
if (localStorage.getItem(currentSide)) {
Cassette.currentTime = localStorage.getItem(currentSide);
}
}
loadTrackData();
resumeMaybe();
Cassette.addEventListener("timeupdate", (event) => {
const time = Cassette.currentTime;
const currentTrack = getTrack(time);
localStorage.setItem(currentSide, time);
if (!currentTrack) return;
TapeDeck.notes.textContent = formatTrackData(currentTrack);
});
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