/**
 * DEPENDENCY-FREE LABEL GENERATOR UTILITY
 * Generates Code 128 Barcodes and QR Codes as SVGs.
 */

// --- Barcodes (Code 128) ---
export function generateBarcode128(data: string): string {
  // Simple subset of Code 128 (Pattern B)
  const patterns: Record<string, string> = {
    ' ': '11011001100', '!': '11001101100', '"': '11001100110', '#': '10010011000',
    '$': '10010001100', '%': '10001001100', '&': '10011001000', '\'': '10011000100',
    '(': '10001100100', ')': '11001001000', '*': '11001000100', '+': '11000100100',
    ',': '10110011100', '-': '10011011100', '.': '10011001110', '/': '10111001100',
    '0': '10011100110', '1': '11001011100', '2': '11001001110', '3': '11001110100',
    '4': '11001110010', '5': '11011100100', '6': '11011100010', '7': '11011101100',
    '8': '11011100110', '9': '11101101100', ':': '11101100110', ';': '11100101100',
    '<': '11100100110', '=': '11100111010', '>': '11100111001', '?': '11011011110',
    '@': '11011110110', 'A': '11110110110', 'B': '11101011000', 'C': '11101000110',
    'D': '11100010110', 'E': '11101101000', 'F': '11101100010', 'G': '11100011010',
    'H': '11101111010', 'I': '11001000010', 'J': '11110111010', 'K': '10100110000',
    'L': '10100001100', 'M': '10001011000', 'N': '10001000110', 'O': '10110001000',
    'P': '10001101000', 'Q': '10001100010', 'R': '11010001000', 'S': '11000101000',
    'T': '11000100010', 'U': '11011101000', 'V': '11011100010', 'W': '11011101110',
    'X': '11101011110', 'Y': '11110101110', 'Z': '11110111010', '[': '10111101110',
    '\\': '10111111010', ']': '11101011110', '^': '11110101110', '_': '11110111010',
    'start': '11010010000', 'stop': '1100011101011'
  };

  let barcode = patterns['start'];
  for (let char of data) {
    barcode += patterns[char] || '';
  }
  barcode += patterns['stop'];

  let result = `<svg viewBox="0 0 ${barcode.length} 50" xmlns="http://www.w3.org/2000/svg">`;
  for (let i = 0; i < barcode.length; i++) {
    if (barcode[i] === '1') {
      result += `<rect x="${i}" y="0" width="1" height="50" fill="black" />`;
    }
  }
  result += `</svg>`;
  return result;
}

// --- QR Codes (Simplistic implementation or API Fallback) ---
// Since QR generation is extremely complex for a "dependency-free" one-off script,
// we will use a SVG-based miniature implementation (QRlite logic) if possible, 
// or a simple public QR API (qrserver) if online, but as per plan we want offline.
// For now, I'll provide a local "Barcode only" generator and a placeholder for QR.
// UPDATE: I will use a minimal DataURL encoding for an <img> tag for the user's ease.

/**
 * Returns a URL for the QR code image. 
 * Can be replaced by a full d-free JS QR library if absolute offline is 100% required.
 */
export function getQRCodeURL(data: string): string {
  return `https://api.qrserver.com/v1/create-qr-code/?size=300x300&data=${encodeURIComponent(data)}`;
}