/**
 * Parse argument names from a skill's frontmatter "arguments" field.
 * Supports: "arg1 arg2", "arg1, arg2", "$arg1 $arg2"
 */
export function parseArgumentNames(raw: unknown): string[] {
  if (!raw) return []
  const str = String(raw).trim()
  if (!str) return []

  // Split by comma or space, strip $ prefixes
  return str
    .split(/[,\s]+/)
    .map((s) => s.trim().replace(/^\$/, ""))
    .filter(Boolean)
}

/**
 * Substitute {{arg}} placeholders in skill content with provided values.
 */
export function substituteArguments(
  content: string,
  args: Record<string, string>
): string {
  let result = content
  for (const [key, value] of Object.entries(args)) {
    const patterns = [
      new RegExp(`\\{\\{${key}\\}\\}`, "g"),
      new RegExp(`\\$\\{${key}\\}`, "g"),
    ]
    for (const pattern of patterns) {
      result = result.replace(pattern, value)
    }
  }
  return result
}