/**
 * Internal shell-quoting and sandbox-result classification helpers.
 *
 * @module @deepseek-ai/dsh-bash-sandbox/helpers
 */

import type { BashRunResult } from '@deepseek-ai/dsh-bash'

/**
 * Quote one string as a single-quoted POSIX shell word.
 * @param text - raw argv element to preserve through the outer shell parse.
 * @returns the quoted shell word.
 */
export function shellQuote(text: string): string {
  return `'${text.replaceAll("'", String.raw`'\''`)}'`
}

/**
 * Classify a failed run against the selected backend's denial dialect.
 * @param result - settled foreground run.
 * @param signatures - case-insensitive denial substrings from the active wrap.
 * @returns whether the failed run matches that denial dialect.
 */
export function classifyDenial(result: BashRunResult, signatures: readonly string[]): boolean {
  return matchesSignature(result.exitCode, result.stderr.text, signatures)
}

/**
 * Classify a failed run against the selected backend's runner-failure dialect.
 * @param result - settled foreground run.
 * @param signatures - case-insensitive runner-failure substrings from the active wrap.
 * @returns whether the failed run matches that runner-failure dialect.
 */
export function classifyRunnerFailure(result: BashRunResult, signatures: readonly string[]): boolean {
  return matchesSignature(result.exitCode, result.stderr.text, signatures)
}

/**
 * Match a non-zero exit against case-insensitive stderr signatures.
 * @param exitCode - process exit code; null means signal termination.
 * @param stderr - collected stderr text.
 * @param signatures - substrings identifying the selected backend's dialect.
 * @returns whether this is a non-zero exit whose stderr matches a signature.
 */
export function matchesSignature(exitCode: number | null, stderr: string, signatures: readonly string[]): boolean {
  if (exitCode === null || exitCode === 0) return false
  const lowered = stderr.toLowerCase()
  return signatures.some(signature => lowered.includes(signature.toLowerCase()))
}