<div class="container">
  <h1 class="header-title">Redbox Tone Generator 🔊</h1>
  <p>Click a button to play the corresponding tone</p>
  <div class="buttons">
    <button class="tone" onclick="playNickel()">Nickel</button>
    <button class="tone" onclick="playDime()">Dime</button>
    <button class="tone" onclick="playQuarter()">Quarter</button>
    <button class="tone" onclick="playDollar()">Dollar</button>
  </div>
</div>

@charset "UTF-8";
@import url("https://fonts.googleapis.com/css2?family=Press+Start+2P&family=IBM+Plex+Mono:ital,wght@0,500&display=swap");

:root {
  font-size: 18px;
  --font-family: "IBM Plex Mono";
  --font-family-headline: "Press Start 2p";
  --color-bg-image-1: #000;
  --color-bg-image-2: #1bb;
  --color-text: #b8afaa;
  --color-bg: #000;
  --color-link: #968a84;
  --color-link-hover: #fff;
  --page-padding: 1rem;
  --color-highlight-start: #968a84;
  --color-highlight-end: #968a84;
  --color-highlight-end-alt: #968a84;
}

* {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}

html {
  block-size: 100%;
}

body {
  min-block-size: 100%;
  margin: 0;
  display: grid;
  place-content: center;
  gap: 1rem;

  color: var(--color-text);
  background-color: var(--color-bg);
  font-family: var(--font-family), serif;

  line-height: 1;
  font-weight: 300;

  -webkit-font-feature-settings: "liga";
  -moz-font-feature-settings: "liga";
  font-feature-settings: "liga";
  -moz-osx-font-smoothing: grayscale;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  text-transform: none;
  word-wrap: normal;
  font-size: 20px;
  margin-block: 0;
  margin-inline: 4px 0;
  vertical-align: text-bottom;

  height: 100vh;
  background: linear-gradient(0.25turn, #3f87a6, #ebf8e1, #3f87a6);
}

h1.header-title {
  font-size: 2rem;
  font-family: var(--font-family-headline), sans-serif;
  margin-bottom: 20px;
}

div.container {
  text-align: center;
  padding: 20px;
  margin: 5px;
  border: 1px solid #666;
  background: rgba(0, 0, 0, 0.7);
  border-radius: 8px;
  backdrop-filter: blur(5px);
  max-width: 458px;
}
div.buttons {
  border: 1px inset #eee;
  margin-top: 15px;
}
button.tone {
  min-width: 150px;
  padding: 15px 30px;
  margin: 10px;
  font-size: 16px;
  cursor: pointer;
  border: none;
  border-radius: 0px;
  /*green*/
  /*
  background-color: #4caf50;
  background: linear-gradient(#4caf50,#61af4c);
  border:2px ridge #5eba62;
  */
  /*red*/
  background-color: #bb0000;
  background: linear-gradient(#dd0000, #bb0000, #9a0000);
  border: 2px ridge #790001;
  color: white;
}
button.tone:before {
  transform: perspective(500px) translate3d(0px, 0, 0px);
}

button.tone:hover {
  border: 2px ridge #790001;

  -moz-text-shadow: 0px 0px 4px #ffffff;
  -webkit-text-shadow: 0px 0px 4px #ffffff;
  text-shadow: 0px 0px 4px #ffffff;
}
button.tone:active {
  transform: perspective(500px) translate3d(0px, 0, -70px);
}

button {
  /* IOS fixes - Safari is the new IE */
  -webkit-appearance: none;
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  pointer-events: auto;
  cursor: pointer;
  touch-action: manipulation;
}

// IOS fixes - Safari is the new IE
document.querySelectorAll("button").forEach((button) => {
  button.addEventListener("touchstart", () => button.classList.add("active"));
  button.addEventListener("touchend", () => button.classList.remove("active"));
});

function playRedboxTone(
  frequency1,
  frequency2,
  beepDuration,
  beepCount,
  pauseDuration,
  repeatCount = 1
) {
  const context = new (window.AudioContext || window.webkitAudioContext)();

  function createOscillator(freq, startTime, duration) {
    let osc = context.createOscillator();
    let gainNode = context.createGain();
    osc.frequency.setValueAtTime(freq, context.currentTime);
    osc.type = "sine";
    osc.connect(gainNode);
    gainNode.connect(context.destination);
    gainNode.gain.setValueAtTime(1, startTime);
    gainNode.gain.setValueAtTime(0, startTime + duration);
    osc.start(startTime);
    osc.stop(startTime + duration);
  }

  let startTime = context.currentTime;

  // Loop through beeps and create with pauses in between
  for (let r = 0; r < repeatCount; r++) {
    for (let i = 0; i < beepCount; i++) {
      createOscillator(frequency1, startTime, beepDuration);
      createOscillator(frequency2, startTime, beepDuration);
      startTime += beepDuration + pauseDuration;
    }
    // longer pause between repetitions of the entire sequence
    startTime += 0.5;
  }
}

// Nickel: 1 beep
function playNickel() {
  playRedboxTone(2200, 1700, 0.066, 1, 0, 1);
}

// Dime: 2 beeps with 66ms pause
function playDime() {
  playRedboxTone(2200, 1700, 0.066, 2, 0.066, 1);
}

// Quarter: 5 beeps with 33ms pause, repeating
function playQuarter() {
  playRedboxTone(2200, 1700, 0.033, 5, 0.033, 1);
}

// 4 Quarters
function playDollar() {
  playRedboxTone(2200, 1700, 0.033, 5, 0.033, 4);
}