/**
 * 隐私技术评估决策辅助
 * 为给定场景计算推荐方案得分
 */
interface PrivacyRequirements {
  hideSender: boolean;
  hideReceiver: boolean;
  hideAmount: boolean;
  hideComputation: boolean;  // 计算过程也要隐私？
  quantumResistance: boolean;
  auditability: boolean;     // 需要审计能力吗？
  performanceBudget: "low" | "medium" | "high";
}

function recommendPrivacyTech(req: PrivacyRequirements): {
  recommended: string;
  score: number;  // 0-100
  alternatives: string[];
  tradeoffs: string[];
} {
  const candidates = [
    { name: "混币", cost: 10, hides: ['sender'], speed: "fast", trust: "semi" },
    { name: "环签名+隐匿地址", cost: 20, hides: ['sender','receiver'], speed: "fast", trust: "none" },
    { name: "Monero (全套餐)", cost: 30, hides: ['sender','receiver','amount'], speed: "medium", trust: "none" },
    { name: "zk-SNARK", cost: 50, hides: ['sender','receiver','amount'], speed: "fast", trust: "crs" },
    { name: "zk-STARK", cost: 60, hides: ['sender','receiver','amount','computation'], speed: "medium2", trust: "none" },
    { name: "同态加密", cost: 90, hides: ['computation','amount'], speed: "slow", trust: "none" },
    { name: "TEE", cost: 20, hides: ['sender','receiver','amount','computation'], speed: "fast", trust: "hardware" },
  ];
  
  const required = [];
  if (req.hideSender) required.push('sender');
  if (req.hideReceiver) required.push('receiver');
  if (req.hideAmount) required.push('amount');
  if (req.hideComputation) required.push('computation');
  
  let best = candidates[0];
  let bestScore = -1;
  
  for (const c of candidates) {
    // 覆盖度检查
    const coversAll = required.every(r => c.hides.includes(r));
    if (!coversAll) continue;
    
    // 信任模型扣分
    let trustScore = 100;
    if (req.auditability && c.trust === "none") trustScore -= 10; // 无信任假设虽好，但审计困难
    if (c.trust === "crs") trustScore -= 20;
    if (c.trust === "hardware") trustScore -= 15;
    
    // 性能匹配
    const perfScore = { "fast": 100, "medium": 70, "medium2": 60, "slow": 30 }[c.speed] || 50;
    
    // 量子要求
    const quantumScore = req.quantumResistance ? (c.name === "zk-STARK" || c.name === "同态加密" ? 100 : 0) : 50;
    
    const score = trustScore * 0.3 + perfScore * 0.4 + quantumScore * 0.3 - c.cost;
    
    if (score > bestScore) {
      best = c;
      bestScore = score;
    }
  }
  
  return {
    recommended: best.name,
    score: Math.round(bestScore),
    alternatives: candidates.filter(c => c !== best).map(c => c.name),
    tradeoffs: [
      best.trust === "none" ? "无需信任假设" : `需要信任: ${best.trust}`,
      `性能: ${best.speed}`,
      `部署成本: ${best.cost}/100`,
    ],
  };
}

// 演示：三种场景
console.log("场景1: 简单代币转账:");
console.log(recommendPrivacyTech({
  hideSender: true, hideReceiver: true, hideAmount: true,
  hideComputation: false, quantumResistance: false,
  auditability: true, performanceBudget: "high"
}));
// 预期: Monero 或 zk-SNARK

console.log("场景2: 后量子要求 + 计算隐私:");
console.log(recommendPrivacyTech({
  hideSender: true, hideReceiver: true, hideAmount: true,
  hideComputation: true, quantumResistance: true,
  auditability: false, performanceBudget: "high"
}));
// 预期: 同态加密（慢但满足全部要求）