async function addHexFromClipboard() {
  try {
    const text = await navigator.clipboard.readText();
    const hex = text.trim();

    // Parse hex color
    const color = parseHexColor(hex);
    if (!color) {
      alert('Invalid hex color in clipboard. Expected format: #RRGGBB or #RRGGBBAA');
      return;
    }

    // Add row to table
    addColorRow(hex, color);

    // Show table if hidden
    document.getElementById('colorTable').classList.remove('hidden');
  } catch (err) {
    alert('Failed to read from clipboard: ' + err.message);
  }
}

document.getElementById('addHexBtn').addEventListener('click', addHexFromClipboard);

document.getElementById('showHiddenBtn').addEventListener('click', () => {
  const rows = document.querySelectorAll('#colorTableBody tr.hidden');
  rows.forEach(row => row.classList.remove('hidden'));
  updateShowHiddenButton();
});

document.addEventListener('keydown', (e) => {
  if (e.key === 'p' || e.key === 'P') {
    addHexFromClipboard();
  }
});

function parseHexColor(hex) {
  // Remove leading hash if present
  const cleanHex = hex.startsWith('#') ? hex.slice(1) : hex;

  // Validate hex string (6 or 8 characters)
  if (!/^[0-9A-Fa-f]{6}([0-9A-Fa-f]{2})?$/.test(cleanHex)) {
    return null;
  }

  // Parse components
  const r = parseInt(cleanHex.slice(0, 2), 16) / 255;
  const g = parseInt(cleanHex.slice(2, 4), 16) / 255;
  const b = parseInt(cleanHex.slice(4, 6), 16) / 255;
  const a = cleanHex.length === 8 ? parseInt(cleanHex.slice(6, 8), 16) / 255 : 1.0;

  return { r, g, b, a, hex: '#' + cleanHex };
}

function addColorRow(originalHex, color) {
  const tbody = document.getElementById('colorTableBody');
  const row = tbody.insertRow();

  // Preview cell
  const previewCell = row.insertCell();
  const preview = document.createElement('div');
  preview.style.width = '40px';
  preview.style.height = '40px';
  preview.style.backgroundColor = `rgba(${color.r * 255}, ${color.g * 255}, ${color.b * 255}, ${color.a})`;
  preview.style.border = '1px solid #ccc';
  preview.style.borderRadius = '4px';
  previewCell.appendChild(preview);

  // Hex cell
  const hexCell = row.insertCell();
  hexCell.textContent = color.hex;

  // Normalized components cell
  const normalizedCell = row.insertCell();
  const normalizedText = `${color.r.toFixed(1)}, ${color.g.toFixed(1)}, ${color.b.toFixed(1)}, ${color.a.toFixed(1)}`;
  normalizedCell.textContent = normalizedText;

  // Action cell with copy and hide buttons
  const actionCell = row.insertCell();

  const copyBtn = document.createElement('button');
  copyBtn.textContent = 'Copy';
  copyBtn.className = 'secondary';
  copyBtn.addEventListener('click', () => {
    navigator.clipboard.writeText(normalizedText).then(() => {
      const originalText = copyBtn.textContent;
      copyBtn.textContent = 'Copied!';
      setTimeout(() => {
        copyBtn.textContent = originalText;
      }, 1500);
    }).catch(err => {
      alert('Failed to copy: ' + err.message);
    });
  });
  actionCell.appendChild(copyBtn);

  const hideBtn = document.createElement('button');
  hideBtn.textContent = 'Hide';
  hideBtn.className = 'secondary';
  hideBtn.addEventListener('click', () => {
    row.classList.add('hidden');
    updateShowHiddenButton();
  });
  actionCell.appendChild(hideBtn);
}

function updateShowHiddenButton() {
  const hiddenRows = document.querySelectorAll('#colorTableBody tr.hidden');
  const showHiddenBtn = document.getElementById('showHiddenBtn');

  if (hiddenRows.length > 0) {
    showHiddenBtn.classList.remove('hidden');
  } else {
    showHiddenBtn.classList.add('hidden');
  }
}