// Helpers for deploy/pair.mjs (kept separate so they are unit-testable).

/**
 * Set `refs.<ref>` in the text of a DSH `.credentials.yaml`, preserving everything else
 * (records, other refs, comments). Values are written as JSON strings (valid YAML scalars).
 */
export function setRefIn(text, ref, value) {
  if (!/^[A-Z][A-Z0-9_]*$/.test(ref)) throw new Error(`bad ref name ${ref}`)
  const q = JSON.stringify(String(value))
  const lines = (text || 'version: 1\n').split('\n')
  if (lines[lines.length - 1] === '') lines.pop()
  let refsAt = lines.findIndex((l) => /^refs:\s*(\{\})?\s*$/.test(l))
  if (refsAt === -1) { lines.push('refs:'); refsAt = lines.length - 1 } else lines[refsAt] = 'refs:'
  let end = refsAt + 1
  while (end < lines.length && /^\s+\S/.test(lines[end])) end++
  const existing = lines.slice(refsAt + 1, end).findIndex((l) => new RegExp(`^\\s+${ref}:`).test(l))
  if (existing >= 0) lines[refsAt + 1 + existing] = `  ${ref}: ${q}`
  else lines.splice(end, 0, `  ${ref}: ${q}`)
  return lines.join('\n') + '\n'
}

/** Read `refs.<ref>` from `.credentials.yaml` text (plain, quoted or JSON-quoted scalars). */
export function getRefIn(text, ref) {
  const m = String(text || '').match(new RegExp(`^\\s+${ref}:\\s*(.+)$`, 'm'))
  if (!m) return undefined
  const v = m[1].trim()
  if (v.startsWith('"')) { try { return JSON.parse(v) } catch { return v.slice(1, -1) } }
  return v.replace(/^'|'$/g, '')
}