const SHA256_PATTERN = /^[a-f0-9]{64}$/;

function normalizeVersion(rawVersion, fallback = '0.0.0') {
  const value = String(rawVersion || '').trim();
  return value || fallback;
}

function compareLooseVersion(left, right) {
  const normalize = (value) => normalizeVersion(value, '0.0.0')
    .replace(/^v/i, '')
    .split('.')
    .map((part) => parseInt(part, 10))
    .map((num) => (Number.isFinite(num) ? num : 0));

  const a = normalize(left);
  const b = normalize(right);
  const size = Math.max(a.length, b.length);
  for (let i = 0; i < size; i += 1) {
    const av = a[i] || 0;
    const bv = b[i] || 0;
    if (av > bv) return 1;
    if (av < bv) return -1;
  }
  return 0;
}

function normalizeReleaseNotes(rawValue) {
  return String(rawValue || '')
    .replace(/\\r\\n/g, '\n')
    .replace(/\\n/g, '\n')
    .replace(/\\r/g, '\n')
    .trim();
}

function normalizeSha256(rawValue) {
  const digest = String(rawValue || '').trim().toLowerCase();
  return SHA256_PATTERN.test(digest) ? digest : '';
}

module.exports = {
  compareLooseVersion,
  normalizeReleaseNotes,
  normalizeSha256,
  normalizeVersion
};