/**
 * LighthouseA11yToolsNudge — mid-run reminder when the user asked for
 * lighthouse or accessibility (a11y) audits but no matching exec has run yet.
 *
 * Soft: max 1 fire. Pairs with evaluateInventedLighthouseA11yCompletionGate.
 */

export const LIGHTHOUSE_A11Y_TOOLS_NUDGE_MAX_ATTEMPTS = 1;

const LIGHTHOUSE_A11Y_USER_RE =
  /(?:\blighthouse\b|\ba11y\b|\baccessibility\b|\baxe\b|\bpa11y\b|无障碍|跑 lighthouse)/iu;

const EXEC_TOOLS = new Set(['exec', 'exec_background']);

export interface LighthouseA11yToolsNudgeRequest {
  userText: string;
  toolCallsByName: Record<string, number>;
  messages?: Array<{ role?: string; content?: unknown }>;
  totalToolCalls: number;
  attempts: number;
}

export type LighthouseA11yToolsNudgeResult =
  | { fire: false }
  | { fire: true; correction: string };

function sawLighthouseA11yExec(
  messages: Array<{ role?: string; content?: unknown }> | undefined,
): boolean {
  if (!messages?.length) return false;
  for (const m of messages) {
    if (!m || m.role !== 'assistant' || !Array.isArray(m.content)) continue;
    for (const block of m.content) {
      const b = block as { type?: string; name?: string; input?: unknown };
      if (b?.type !== 'tool_use' || !b.name || !EXEC_TOOLS.has(b.name)) continue;
      const input = b.input;
      if (!input || typeof input !== 'object') continue;
      const o = input as Record<string, unknown>;
      let cmd = '';
      for (const key of ['command', 'cmd', 'input'] as const) {
        if (typeof o[key] === 'string' && String(o[key]).trim()) {
          cmd = String(o[key]);
          break;
        }
      }
      if (
        /\blighthouse\b/i.test(cmd) ||
        /\baxe\b/i.test(cmd) ||
        /\bpa11y\b/i.test(cmd) ||
        /\baccessibility\b/i.test(cmd) ||
        /\bnpm run (?:lighthouse|a11y|test:a11y)\b|\bpnpm (?:run )?(?:lighthouse|a11y|test:a11y)\b|\byarn (?:lighthouse|a11y|test:a11y)\b/i.test(
          cmd,
        )
      ) {
        return true;
      }
    }
  }
  return false;
}

export function evaluateLighthouseA11yToolsNudge(
  request: LighthouseA11yToolsNudgeRequest,
): LighthouseA11yToolsNudgeResult {
  if (request.attempts >= LIGHTHOUSE_A11Y_TOOLS_NUDGE_MAX_ATTEMPTS) return { fire: false };
  if (request.totalToolCalls < 1) return { fire: false };
  if (sawLighthouseA11yExec(request.messages)) return { fire: false };

  const user = (request.userText || '').trim();
  if (!user || !LIGHTHOUSE_A11Y_USER_RE.test(user)) return { fire: false };

  if (
    /(?:what is|how does|文档|原理|介绍)/iu.test(user) &&
    !/(?:run|please|now|帮我|请|现在|跑|检测)/iu.test(user)
  ) {
    return { fire: false };
  }

  return {
    fire: true,
    correction:
      '[System] The user asked for lighthouse or accessibility (a11y) checks, and tools have already run without a matching command ' +
      '(`lighthouse`, `axe`, `pa11y`, `npm run a11y`, etc.). ' +
      'Run the real audit via `exec` and report its output, or clearly say it was not run. ' +
      'Do not invent lighthouse scores or a11y pass results.',
  };
}