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/**

* Tiny UI blip for the terminal, synthesised on a shared AudioContext.

* Used when the `beeps` setting is enabled. No-ops gracefully if Web Audio

* is unavailable or before any user gesture.

*/

let ctx = null;

export function playBeep(volume = 0.3, freq = 660) {

try {

const AudioCtx = window.AudioContext || window.webkitAudioContext;

if (!AudioCtx) return;

if (!ctx) ctx = new AudioCtx();

if (ctx.state === 'suspended') ctx.resume();

const osc = ctx.createOscillator();

const gain = ctx.createGain();

osc.type = 'square';

osc.frequency.value = freq;

const v = Math.max(0, Math.min(0.3, volume * 0.4));

const now = ctx.currentTime;

gain.gain.setValueAtTime(0.0001, now);

gain.gain.exponentialRampToValueAtTime(v, now + 0.005);

gain.gain.exponentialRampToValueAtTime(0.0001, now + 0.08);

osc.connect(gain);

gain.connect(ctx.destination);

osc.start(now);

osc.stop(now + 0.09);

} catch {

/* ignore */

}

}