function computeIntersection(agentProfile, platformProfile) {
  const agentCaps = Object.keys(agentProfile.capabilities);
  const platformCaps = Object.keys(platformProfile.capabilities);

  return agentCaps.filter(cap => platformCaps.includes(cap));
}

// Agent支持: checkout, identity_linking, buyer_consent
// Platform支持: checkout, order, buyer_consent
// 交集: checkout, buyer_consent

function selectVersion(agentCap, platformCap) {
  const agentVersions = agentCap.supported_versions || [agentCap.version];
  const platformVersions = platformCap.supported_versions || [platformCap.version];

  const mutual = agentVersions.filter(v => platformVersions.includes(v));
  // 日期字符串可以直接字典序比较
  return mutual.sort().reverse()[0]; // 最高版本
}

function pruneOrphans(negotiated, dependencyMap) {
  return negotiated.filter(cap => {
    const deps = dependencyMap[cap] || [];
    return deps.every(dep => negotiated.includes(dep));
  });
}

// buyer_consent 依赖 checkout (在交集中) -> 保留
// ap2_mandate 依赖 checkout + identity (identity不在交集中) -> 移除

function negotiate(agentProfile, platformProfile, dependencyMap) {
  let result = computeIntersection(agentProfile, platformProfile);

  // 为每个能力选择版本
  result = result.map(cap => ({
    name: cap,
    version: selectVersion(
      agentProfile.capabilities[cap],
      platformProfile.capabilities[cap]
    )
  })).filter(cap => cap.version); // 移除无共同版本的能力

  // 反复修剪直到稳定
  let prev;
  do {
    prev = result.map(c => c.name);
    result = result.filter(cap => {
      const deps = dependencyMap[cap.name] || [];
      return deps.every(dep => prev.includes(dep));
    });
  } while (result.length !== prev.length);

  return result;
}

{
  "capabilities": {
    "dev.ucp.shopping.checkout": {
      "version": "2026-04-08"
    },
    "com.shopify.abandoned_cart_recovery": {
      "version": "2026-01-15"
    },
    "com.shopify.loyalty_points": {
      "version": "2026-03-01"
    }
  }
}

AI代理 → UCP格式请求 → 适配层(CF Worker/Node.js) → WooCommerce API
                              │
                              ├─ 格式转换: WC格式 ↔ UCP格式
                              ├─ /.well-known/ucp Profile
                              ├─ OAuth 2.0代理（WC原生用API Key）
                              └─ 签名密钥管理

https://store-a.platform.com/.well-known/ucp  → 商家A的Profile
https://store-b.platform.com/.well-known/ucp  → 商家B的Profile