System Audit & Guardrail Synthesizer

import { z } from "zod";
import type { Request, Response, NextFunction } from "express";

/**
 * Ethotechnics Governance Guardrail Middleware
 * System: Autonomous Customer Support & Refunds Agent
 * Target SLA: Time-to-Halt <= 30s, Reversal SLA <= 48h
 * Mitigated Failure Vectors:
 * - Unearned Closure (high risk)
 * - Administrative Shame & Burden Shifting (high risk)
 * - Heroism-Dependent Escalation (high risk)
 * - Affect-Invariance Violation (medium risk)
 */

// 1. Decision Object Schema enforcing Contestability
export const DecisionObjectSchema = z.object({
  decisionId: z.string().uuid(),
  systemId: z.literal("autonomouscustomersupportrefundsagent"),
  timestamp: z.string().datetime(),
  claimantId: z.string().min(1),
  actionClass: z.enum(["ADVERSE", "PERMISSIVE", "INTERIM_HOLD"]),
  modelConfidence: z.number().min(0).max(1),
  reasons: z.array(z.string()).min(1),
  bindingClock: z.object({
    startedAt: z.string().datetime(),
    reversalDeadline: z.string().datetime(),
    timeToHaltTargetSeconds: z.literal(30),
  }),
  appealPath: z.object({
    endpoint: z.string().url(),
    maxSteps: z.number().max(3),
    burdenInversionActive: z.boolean(),
  }),
});

export type DecisionObject = z.infer<typeof DecisionObjectSchema>;

// 2. Ethical Circuit Breaker & Safe-Pause Middleware
export function createEthotechnicGuard(config = { safePauseThreshold: 0.85 }) {
  let rollingReversals = 0;
  let totalEvaluations = 0;

  return async (req: Request, res: Response, next: NextFunction) => {
    const startTime = Date.now();

    // Check circuit breaker status
    if (totalEvaluations > 50 && (rollingReversals / totalEvaluations) > 0.3) {
      return res.status(503).json({
        error: "ETHOTECHNIC_CIRCUIT_BREAKER_TRIGGERED",
        message: "Excessive decision reversal rate detected. System safe-paused.",
        safePauseActive: true,
      });
    }

    res.on("finish", () => {
      const durationSec = (Date.now() - startTime) / 1000;
      if (durationSec > 30) {
        console.warn(`[SLA BREACH] Time-to-Halt exceeded: ${durationSec}s > 30s`);
      }
    });

    next();
  };
}