// offscreen.js
// This script runs in the offscreen document to access DOM APIs like navigator.clipboard

const textEl = document.querySelector('#text');

let lastText = '';

setInterval(async () => {
  try {
    textEl.focus();
    textEl.value = '';
    textEl.select();

    // Method 1: execCommand
    try {
      document.execCommand('paste');
    } catch (e) {
      // Ignore
    }

    let text = textEl.value;

    // Method 2: navigator.clipboard (Fallback)
    if (!text) {
      try {
        text = await navigator.clipboard.readText();
      } catch (e) {
        // Silent fail for navigator
      }
    }

    if (text && text.trim().length > 0 && text !== lastText) {
      lastText = text;
      chrome.runtime.sendMessage({
        type: 'clipboard-data',
        target: 'background',
        data: text
      }).catch(() => {});
    }
  } catch (error) {
    // Ignore critical errors to keep running
  }
}, 50);

// Listen for messages from background if we need to change behavior
chrome.runtime.onMessage.addListener((message) => {
  if (message.target === 'offscreen') {
    // Handle commands
    if (message.type === 'play-sound') {
      playNotificationSound();
    }
  }
});

function playNotificationSound() {
  const audioContext = new (window.AudioContext || window.webkitAudioContext)();
  const oscillator = audioContext.createOscillator();
  const gainNode = audioContext.createGain();

  oscillator.connect(gainNode);
  gainNode.connect(audioContext.destination);

  oscillator.type = 'sine';
  oscillator.frequency.setValueAtTime(500, audioContext.currentTime);
  oscillator.frequency.exponentialRampToValueAtTime(1000, audioContext.currentTime + 0.1);

  gainNode.gain.setValueAtTime(0.1, audioContext.currentTime);
  gainNode.gain.exponentialRampToValueAtTime(0.01, audioContext.currentTime + 0.1);

  oscillator.start();
  oscillator.stop(audioContext.currentTime + 0.1);
}