### JavaScript: Load and Play Audio Tracks with Web Audio API

Source: https://context7.com/dmvjs/kwyjibo/llms.txt

This code example shows how to load audio buffers and schedule precise playback using the Web Audio API. It involves getting the audio context, fetching track data for specific song IDs, and using a BufferLoader to manage the loading and playback process, including tempo information.

```javascript
import { BufferLoader } from './js/BufferLoader.js';
import { getContext } from './js/context.js';
import { getTracks } from './js/tracks.js';

// Get the audio context
const audioContext = getContext();

// Get track URLs for two specific song IDs
const trackData = getTracks(42, 137, false, false);
// Returns: { bpm: 94, list: ['../music/00000042-lead.mp3', '../music/00000137-lead.mp3', ...] }

// Load and play the tracks
const bufferLoader = new BufferLoader(
  audioContext,
  trackData,
  (bufferList, tempo) => {
    // Create audio source
    const source = audioContext.createBufferSource();
    source.buffer = bufferList[0];
    source.connect(audioContext.destination);
    source.start(audioContext.currentTime);

    console.log(`Playing at ${tempo} BPM`);
  }
);

bufferLoader.load();
```

--------------------------------

### Initialize Web Audio API Context (JavaScript)

Source: https://context7.com/dmvjs/kwyjibo/llms.txt

Creates and manages the Web Audio API context, essential for precise audio playback. It provides a singleton instance of the audio context and handles resuming it after user interaction. The example also demonstrates setting up a basic audio processing chain and scheduling precise playback using `audioContext.currentTime`.

```javascript
import { getContext } from './js/context.js';

// Get singleton audio context instance
const audioContext = getContext();
console.log(audioContext.state); // 'suspended', 'running', or 'closed'

// Resume context (required after user interaction)
audioContext.resume().then(() => {
  console.log('Audio context running');
});

// Create audio processing chain
const source = audioContext.createBufferSource();
const gainNode = audioContext.createGain();
const compressor = audioContext.createDynamicsCompressor();

source.connect(gainNode);
gainNode.connect(compressor);
compressor.connect(audioContext.destination);

// Schedule precise playback
const startTime = audioContext.currentTime + 0.1;
source.start(startTime)
```

--------------------------------

### JavaScript: Generate Quantum and Cryptographic Random Numbers

Source: https://context7.com/dmvjs/kwyjibo/llms.txt

This example showcases methods for generating random numbers, prioritizing quantum random number generation (QRNG) for unpredictability and falling back to cryptographic randomness if necessary. It includes functions for generating random floats, integers within a range, and selecting random elements from an array.

```javascript
import { quantumRandom, cryptoRandom } from './js/cryptoRandom.js';
import { QRNG } from './js/qrng.js';

// Get a quantum random float (0-1)
const randomValue = quantumRandom();
console.log(randomValue); // 0.7234812... (truly random from quantum source)

// Use for song selection
const songIndex = Math.floor(quantumRandom() * availableSongs.length);
const selectedSong = availableSongs[songIndex];

// Create a QRNG instance for more control
const qrng = new QRNG(2048); // cache size

qrng.onReady = () => {
  console.log('Quantum random number generator ready');
};

// Get quantum random integer
const diceRoll = qrng.getInteger(1, 7);
console.log(`Rolled: ${diceRoll}`); // 1-6

// Get random choice from array
const keys = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12];
const randomKey = qrng.getChoice(keys);
console.log(`Starting key: ${randomKey}`);
```

--------------------------------

### Define and Access Song Data (JavaScript)

Source: https://context7.com/dmvjs/kwyjibo/llms.txt

Defines and provides access to song metadata, including tempo, key, artist, and title. It includes functions to retrieve songs by ID, remove them from a playlist, and reset the entire song library. The example shows the structure of a song object and how to interact with the song data.

```javascript
import { songdata } from './js/songdata.js';
import { getSongById, removeSongFromListById, resetSongs } from './js/song.js';

// Song data structure (excerpt from full 273+ song library)
// Each song has: id, bpm, key, artist, title, computedKey (optional)
const exampleSong = {
  id: 42,
  bpm: 94,
  key: 5,
  artist: 'Daft Punk',
  title: 'Around The World',
  computedKey: 6 // optional: key after time-shifting
};

// Get total song count
console.log(`Library size: ${songdata.length} songs`);

// Find song by ID
const song = getSongById(42);
console.log(`${song.artist} - ${song.title} [${song.key}] @ ${song.bpm}bpm`);

// Remove song from active playlist (prevents replays)
removeSongFromListById(42);

// Reset song list (restore all songs)
resetSongs()
```

--------------------------------

### Generate Track File Paths (JavaScript)

Source: https://context7.com/dmvjs/kwyjibo/llms.txt

Generates audio file paths with support for lead/body distinction and automatic format detection based on the environment. It uses a utility function `file` to construct paths and `filetype` to determine the appropriate audio format (.mp3 on production, .wav on localhost). Prefetching tracks is also demonstrated for smoother playback.

```javascript
import { file } from './js/utils.js';
import { filetype } from './js/filetype.js';

// Get lead (intro) track - 16 beats
const leadTrack = file(42, true);
console.log(leadTrack); // '../music/00000042-lead.mp3'

// Get body (main) track - 64 beats
const bodyTrack = file(42, false);
console.log(bodyTrack); // '../music/00000042-body.mp3'

// File type determined by environment
console.log(filetype); // '.mp3' on production, '.wav' on localhost

// Prefetch tracks for smooth playback
fetch(file(42, true));
fetch(file(42, false))
```

--------------------------------

### JavaScript: Filter and Select Songs by Tempo and Key

Source: https://context7.com/dmvjs/kwyjibo/llms.txt

This snippet demonstrates how to retrieve songs based on tempo and musical key constraints, including fallback to compatible adjacent keys. It utilizes functions to set active tempo and key, and then fetches matching songs. It also shows how to select a specific song while excluding certain artists to prevent repetition.

```javascript
import { getSongs, getSong } from './js/getSongs.js';
import { setActiveTempo } from './js/tempo.js';
import { setActiveKey } from './js/key.js';

// Set the active tempo and key
setActiveTempo(94);
setActiveKey(5);

// Get all songs matching current tempo and key (including adjacent keys)
const { thisKeySongs, thisTempoSongs } = getSongs();
console.log(`Found ${thisKeySongs.length} songs in compatible keys`);
console.log(`Found ${thisTempoSongs.length} songs at 94 BPM`);

// Get a specific song with artist exclusion to avoid repetition
const nextSong = getSong(5, 'Daft Punk');
console.log(`Selected: ${nextSong.artist} - ${nextSong.id}`);
// Output: { artist: 'Justice', id: 42 }
```

--------------------------------

### Basic HTML and Body Styling for Kwyjibo DJ

Source: https://github.com/dmvjs/kwyjibo/blob/main/index.html

Defines fundamental styles for the HTML and body elements, setting a dark background with a repeating background image, a specific font, and text alignment for the Kwyjibo DJ application. It also includes a media query for small screens to prevent horizontal overflow.

```css
html, body {
  font-family: 'Helvetica Neue', 'Arial Nova', Helvetica, Arial, sans-serif;
  color: black;
  text-align: center;
  line-height: 1.375;
  letter-spacing: -1px;
  font-size: 18px;
  background: black;
  height: 100%;
  margin: 0;
  padding: 0;
  background: url("bg-2048.jpg");
  background-color: #090911;
  background-repeat: no-repeat;
  background-size: cover;
}

@media only screen and (max-width: 320px) {
  body {
    overflow-x: hidden;
    max-width: 100%;
  }
}
```

--------------------------------

### JavaScript: Navigate Musical Keys and Sort by Compatibility

Source: https://context7.com/dmvjs/kwyjibo/llms.txt

This snippet demonstrates functionalities for traversing musical keys, including automatic wrapping around the 12 keys and forward/reverse progression. It also includes a keySort function to arrange songs based on their harmonic compatibility, prioritizing closer keys.

```javascript
import { getNextKey, keySort, setActiveKey } from './js/key.js';

// Start at key 7
setActiveKey(7);

// Get the next key (forward progression)
const nextKey = getNextKey(7);
console.log(nextKey); // 8

// Get the previous key (reverse progression)
const prevKey = getNextKey(7, true);
console.log(prevKey); // 6

// Wrap around boundaries
const wrapped = getNextKey(12);
console.log(wrapped); // 1

// Sort songs by key compatibility
const songs = [
  { id: 1, key: 7, title: 'Track A' },
  { id: 2, key: 8, title: 'Track B' },
  { id: 3, key: 3, title: 'Track C' }
];
songs.sort(keySort);
// Most compatible keys (7, 8, 6) will be sorted first
```

--------------------------------

### Display Area Styling for Kwyjibo DJ

Source: https://github.com/dmvjs/kwyjibo/blob/main/index.html

Styles the 'Now Playing' and 'On Deck' sections of the Kwyjibo DJ application, creating a semi-transparent dark background with rounded corners. It also includes styles for song titles within these sections.

```css
#now-playing, #on-deck {
  display: none;
  letter-spacing: 1px;
  text-shadow: 1px 1px 1px rgba(0,0,0,1);
  background: rgba(0,0,0,0.85);
  padding: 16px 24px;
  border-radius: 8px;
  max-width: 250px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 16px;
  margin-top: 16px;
}

#now-playing h3, #on-deck h3 {
  margin-bottom: 8px;
}

#first-song-label, #second-song-label {
  margin-bottom: 8px;
  line-height: 1.1;
  font-size: 1.125rem;
  font-style: normal;
}
```

--------------------------------

### Parse Track Sequences from URL (JavaScript)

Source: https://context7.com/dmvjs/kwyjibo/llms.txt

Parses track sequences from URL parameters, supporting both comma-dash notation and JSON array notation. The `parseTracks` utility function handles these formats, converting them into a structured array of track pairs. It also demonstrates accessing parsed tracks directly from URL parameters.

```javascript
import { parseTracks } from './js/utils.js';
import { tracksFromURL, parsedTracks } from './js/init.js';

// Parse comma-dash notation: 1,2-3,4-5,6
// Format: pairs separated by dash, songs separated by comma
const url = '1,2-3,4-5,6';
const parsed = parseTracks(url);
console.log(parsed);
// Output: [[1,2], [3,4], [5,6]]

// Parse JSON array notation
const jsonUrl = '[[10,20],[30,40]]';
const jsonParsed = parseTracks(jsonUrl);
console.log(jsonParsed);
// Output: [[10,20], [30,40]]

// Access via URL parameter
// URL: ?tracks=1,2-3,4-5,6
console.log(tracksFromURL); // '1,2-3,4-5,6'
console.log(parsedTracks); // [[1,2], [3,4], [5,6]]
```

--------------------------------

### Audio Buffer Management in JavaScript

Source: https://context7.com/dmvjs/kwyjibo/llms.txt

Manages audio buffer sources by pre-allocating and reusing them for efficient memory usage. It involves setting buffer padding for scheduling and replenishing the buffer pool.

```javascript
import { getBuffer, replenishBuffers, setBufferPadding, bufferPadding } from './js/buffers.js';
import { getContext } from './js/context.js';

// Get a pre-allocated buffer source
const source = getBuffer();
source.buffer = audioBuffer; // Set your decoded audio buffer
source.connect(getContext().destination);

// Schedule with buffer padding (accumulated time offset)
console.log(bufferPadding); // Current time offset
source.start(bufferPadding);

// Update padding for next track
const trackDuration = audioBuffer.duration;
setBufferPadding(bufferPadding + trackDuration);

// Replenish buffer pool after use
replenishBuffers(4); // Pre-create 4 new buffer sources
```

--------------------------------

### Dynamic Track Selection in JavaScript

Source: https://context7.com/dmvjs/kwyjibo/llms.txt

Enables dynamic track selection based on user input and countdown timers. It populates select elements with songs and retrieves user-selected song IDs for playback.

```javascript
import { getSelectedSongIds, loadSongsIntoSelect } from './js/tracks.js';
import { deck1Select, deck2Select } from './js/dom.js';

// Populate deck selects with available songs
loadSongsIntoSelect();
// Fills <select> elements with songs matching current tempo/key
// Pre-selects two compatible songs from current key

// Get user-selected songs
const [firstSong, secondSong] = getSelectedSongIds();
if (firstSong && secondSong) {
  console.log(`Deck 1: ${firstSong.artist} - ${firstSong.title}`);
  console.log(`Deck 2: ${secondSong.artist} - ${secondSong.title}`);
  // Load and play selected tracks
} else {
  console.log('Using automatic selection');
}
```

--------------------------------

### Interactive Element Styling for Kwyjibo DJ

Source: https://github.com/dmvjs/kwyjibo/blob/main/index.html

Styles interactive elements like radio button labels and buttons within the Kwyjibo DJ application. This includes defining background colors for selected radio options, styling for play and share buttons, and a dropdown select element.

```css
#key-radio input:checked#key-1 + label {
  background-color: rgba(86,241,218,1);
  color: black;
}
#key-radio input:checked#key-2 + label {
  background-color: rgba(125,242,170,1);
  color: black;
}
#key-radio input:checked#key-3 + label {
  background-color: rgba(174,245,137,1);
  color: black;
}
#key-radio input:checked#key-4 + label {
  background-color: rgba(232,218,161,1);
  color: black;
}
#key-radio input:checked#key-5 + label {
  background-color: rgba(253,191,167,1);
  color: black;
}
#key-radio input:checked#key-6 + label {
  background-color: rgba(253,175,183,1);
  color: black;
}
#key-radio input:checked#key-7 + label {
  background-color: rgba(253,170,204,1);
  color: black;
}
#key-radio input:checked#key-8 + label {
  background-color: rgba(242,171,228,1);
  color: black;
}
#key-radio input:checked#key-9 + label {
  background-color:rgba(221,180,253,1);
  color: black;
}
#key-radio input:checked#key-10 + label {
  background-color:rgba(190,205,253,1);
  color: black;
}
#key-radio input:checked#key-11 + label {
  background-color:rgba(142,228,249,1);
  color: black;
}
#key-radio input:checked#key-12 + label {
  background-color: rgba(85,240,240,1);
  color: black;
}

button {
  border-radius: 4px;
  color: dodgerblue;
  font-weight: 700;
  font-size: 1.1rem;
  padding: 0.5rem;
  margin: 8px 4px;
  display: inline-block;
  max-height: 48px;
  background-color: black;
  cursor: pointer;
  border: none;
}

button a {
  color: dodgerblue;
  text-decoration: none;
  display: inline-block;
}

#play-button {
  height: 60px;
  border: 2px solid dodgerblue;
  border-radius: 8px;
  padding: 16px 24px;
  line-height: 0;
  font-size: 1.5rem;
  font-weight: 900;
  width: 300px;
  margin-left: auto;
  margin-right: auto;
  display: block;
  margin-top: 8px;
}

#play-button:active, #play-button:focus {
  border: 2px solid blue;
  color: blue;
}

#share-button {
  height: 60px;
  display: block !important;
  border: 2px solid orangered;
  border-radius: 8px;
  padding: 16px 24px;
  line-height: 0;
  font-size: 1.5rem;
  font-weight: 900;
  width: 300px;
  margin-left: auto;
  margin-right: auto;
  color: orangered;
  margin-top: 0;
}

#share-button:active, #share-button:focus {
  border: 2px solid darkorange;
  color: darkorange;
}

select {
  border-radius: 8px;
  background-color: black;
  color: dodgerblue;
  border: 2px solid dodgerblue;
  width: 300px;
  cursor: pointer;
  height: 48px;
  font-size: 14px;
  line-height: 16px;
  -webkit-appearance: menulist-button;
  -moz-appearance: none;
  margin-bottom: 8px;
}
```

--------------------------------

### Shuffle Arrays with Quantum Randomness (JavaScript)

Source: https://context7.com/dmvjs/kwyjibo/llms.txt

Shuffles arrays using quantum randomness for unpredictable ordering. This function is added as a prototype method to all arrays. It relies on the `quantumRandom` function for generating sort values, ensuring true unpredictability beyond pseudorandom methods. Be aware that this method modifies the original array in place.

```javascript
import './js/shuffle.js';
import { quantumRandom } from './js/cryptoRandom.js';

// Prototype method added to all arrays
const songs = [
  { id: 1, title: 'Song A' },
  { id: 2, title: 'Song B' },
  { id: 3, title: 'Song C' }
];

const shuffled = songs._shuffle();
console.log(shuffled);
// Output: [{ id: 3, ... }, { id: 1, ... }, { id: 2, ... }]

// The shuffle is quantum-random, not pseudorandom
// Implementation uses quantumRandom() for sort values
```

--------------------------------

### Manage Playback Tempo (JavaScript)

Source: https://context7.com/dmvjs/kwyjibo/llms.txt

Controls audio playback tempo with automatic transitions and UI synchronization. It allows setting the active tempo, extracting available tempos from song data, and locking the tempo via URL parameters to prevent automatic changes. The code calculates bar durations based on the active tempo.

```javascript
import { setActiveTempo, activeTempo, tempos } from './js/tempo.js';
import { songdata } from './js/songdata.js';

// Available tempos extracted from song data
console.log(tempos); // [84, 94, 102]

// Set the active tempo
setActiveTempo(94);
console.log(activeTempo); // 94

// Lock tempo via URL parameter
// URL: ?bpm=94&lock=true
// This prevents automatic tempo changes

// Calculate bar duration for timing
const barDuration = 60 / activeTempo; // seconds per beat
const sixteenBars = barDuration * 16;
console.log(`16 bars at ${activeTempo}bpm = ${sixteenBars}s`)
```

--------------------------------

### Radio Button Group Styling for Kwyjibo DJ

Source: https://github.com/dmvjs/kwyjibo/blob/main/index.html

Styles radio button groups, specifically for tempo and key selection in the Kwyjibo DJ application. It uses flexbox for layout and defines styles for hidden inputs and their associated labels, including visual feedback on selection and hover states.

```css
#tempo-radio {
  display: flex;
  max-width: 300px;
  margin-left: auto;
  margin-right: auto;
  cursor: pointer;
}

.radio {
  flex: 1 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  cursor: pointer;
}

#tempo-radio, #key-radio {
  display: flex;
  margin-bottom: 16px;
  overflow: hidden;
}

#tempo-radio input, #key-radio input {
  position: absolute !important;
  clip: rect(0, 0, 0, 0);
  height: 1px;
  width: 1px;
  border: 0;
  overflow: hidden;
}

#tempo-radio label, #key-radio label {
  font-style: normal;
  background-color: #222;
  color: #CCC;
  font-size: 14px;
  line-height: 1;
  text-align: center;
  padding: 8px;
  margin-right: -1px;
  border: 1px solid rgba(0, 0, 0, 0.2);
  box-shadow: inset 0 1px 3px black, 0 1px rgba(255, 255, 255, 0.1);
  transition: a
```

--------------------------------

### UI Update and Track Display in JavaScript

Source: https://context7.com/dmvjs/kwyjibo/llms.txt

Updates the user interface with currently playing tracks and visual indicators. It uses a UI update function to modify elements like background color, labels, and button colors.

```javascript
import { updateUI, fsID, ssID } from './js/tracks.js';
import { activeKey } from './js/key.js';

// Create UI update function for track transition
const uiUpdater = updateUI(
  5,           // key
  42,          // first song ID
  137,         // second song ID
  2,           // track index
  false        // isFromCountdown
);

// Execute UI update (call when playback starts)
requestAnimationFrame(uiUpdater);
// Updates:
// - Body background color based on key
// - Now playing labels with artist/title
// - Button colors
// - Track history (window.playedSongs)

// Access currently playing IDs
console.log(`Playing: ${fsID}, ${ssID}`);
```

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