"use client";

/**
 * Chip-bank movement sounds for the fixed Chip Bank card. Independent of the
 * table sound engines (the card lives on both the poker and blackjack pages,
 * outside any table). Best-effort autoplay: if the browser blocks the
 * AudioContext until a gesture, these simply stay silent.
 */

let ctx: AudioContext | null = null;

function getCtx(): AudioContext | null {
  if (typeof window === "undefined") return null;
  try {
    if (!ctx) {
      const Ctor =
        window.AudioContext ??
        (window as unknown as { webkitAudioContext?: typeof AudioContext }).webkitAudioContext;
      if (!Ctor) return null;
      ctx = new Ctor();
    }
    if (ctx.state === "suspended") {
      void ctx.resume().catch(() => undefined);
    }
    return ctx;
  } catch {
    return null;
  }
}

function tone(
  frequency: number,
  nextFrequency: number,
  duration: number,
  delay: number,
  volume = 0.14,
): void {
  const context = getCtx();
  if (!context) return;
  try {
    const start = context.currentTime + delay;
    const oscillator = context.createOscillator();
    const gain = context.createGain();
    oscillator.type = "sine";
    oscillator.frequency.setValueAtTime(frequency, start);
    oscillator.frequency.exponentialRampToValueAtTime(Math.max(1, nextFrequency), start + duration);
    gain.gain.setValueAtTime(0.0001, start);
    gain.gain.exponentialRampToValueAtTime(volume, start + 0.015);
    gain.gain.exponentialRampToValueAtTime(0.0001, start + duration);
    oscillator.connect(gain);
    gain.connect(context.destination);
    oscillator.start(start);
    oscillator.stop(start + duration + 0.05);
  } catch {
    // Sound is best-effort; never throw from a balance indicator.
  }
}

/** Chips arriving: short rising pair. */
export function playChipBankUp(): void {
  tone(523, 523, 0.09, 0);
  tone(784, 784, 0.12, 0.09);
}

/** Chips leaving: short falling pair. */
export function playChipBankDown(): void {
  tone(392, 392, 0.09, 0);
  tone(262, 262, 0.14, 0.09);
}