// Helpers for the FormField.options column, which is stored as a JSON-encoded
// string in SQLite (no native scalar lists). The client/API contract keeps
// `options` as a real string[] — these convert at the DB boundary.

export function parseOptions(raw: unknown): string[] {
  if (Array.isArray(raw)) return raw as string[]
  if (typeof raw !== 'string' || raw.length === 0) return []
  try {
    const v = JSON.parse(raw)
    return Array.isArray(v) ? v.map(String) : []
  } catch {
    return []
  }
}

export function serializeOptions(opts: unknown): string {
  return JSON.stringify(Array.isArray(opts) ? opts : [])
}

// Returns a shallow copy of a form with each field's `options` parsed to string[].
export function withParsedFields<T extends { fields?: any[] | null }>(form: T | null): T | null {
  if (!form) return form
  if (Array.isArray(form.fields)) {
    return {
      ...form,
      fields: form.fields.map(f => ({ ...f, options: parseOptions(f.options) })),
    }
  }
  return form
}