#!/usr/bin/env node
/**
 * 小牛看房 — 房源智能匹配引擎 v1.0
 *
 * 用法：
 *   node match-engine.js                          # 匹配全部客户
 *   node match-engine.js --buyer buyer_001        # 匹配单个客户
 *   node match-engine.js --buyer buyer_001 --top 3 # 输出 Top-3
 */

const fs = require('fs');
const path = require('path');

// ============================================================
// 一、数据加载
// ============================================================

function loadData() {
  const buyers = JSON.parse(
    fs.readFileSync(path.join(__dirname, 'buyers.json'), 'utf8')
  ).clients;
  const properties = JSON.parse(
    fs.readFileSync(path.join(__dirname, 'properties.json'), 'utf8')
  ).properties;
  return { buyers, properties };
}

// ============================================================
// 二、五类客户权重模板（来源：经纪人访谈 + 客户画像分析）
// ============================================================

const WEIGHT_TEMPLATES = {
  '婚房刚需型': {
    priceAdvantage: 0.30,
    layoutMatch: 0.15,
    areaMatch: 0.10,
    decoration: 0.10,
    schoolMatch: 0.05,
    transport: 0.10,
    community: 0.05,
    floorMatch: 0.05,
    orientation: 0.05,
    surrounding: 0.05,
  },
  '学区焦虑型': {
    priceAdvantage: 0.15,
    layoutMatch: 0.10,
    areaMatch: 0.05,
    decoration: 0.05,
    schoolMatch: 0.45,
    transport: 0.10,
    community: 0.05,
    floorMatch: 0.02,
    orientation: 0.02,
    surrounding: 0.01,
  },
  '置换改善型': {
    priceAdvantage: 0.20,
    layoutMatch: 0.20,
    areaMatch: 0.20,
    decoration: 0.15,
    schoolMatch: 0.05,
    transport: 0.05,
    community: 0.10,
    floorMatch: 0.03,
    orientation: 0.02,
    surrounding: 0.00,
  },
  '隐性需求型': {
    priceAdvantage: 0.20,
    layoutMatch: 0.10,
    areaMatch: 0.10,
    decoration: 0.25,
    schoolMatch: 0.05,
    transport: 0.10,
    community: 0.10,
    floorMatch: 0.05,
    orientation: 0.03,
    surrounding: 0.02,
  },
  '刚需升级型': {
    priceAdvantage: 0.25,
    layoutMatch: 0.15,
    areaMatch: 0.15,
    decoration: 0.20,
    schoolMatch: 0.05,
    transport: 0.05,
    community: 0.05,
    floorMatch: 0.05,
    orientation: 0.03,
    surrounding: 0.02,
  },
};

// ============================================================
// 三、卖点标签 → 客户类型加分映射（来源：经纪人访谈提炼）
// ============================================================

const HIGHLIGHT_BONUS = {
  '豪装': { '隐性需求型': 3, '刚需升级型': 3 },
  '精装': { '隐性需求型': 2, '刚需升级型': 2, '置换改善型': 1 },
  '满五唯一': { '婚房刚需型': 2 },
  '业主急售': { '婚房刚需型': 2, '置换改善型': -1 },
  '急售': { '婚房刚需型': 2, '置换改善型': -1 },
  '南北通透': { '婚房刚需型': 1, '置换改善型': 1, '刚需升级型': 1, '隐性需求型': 1, '学区焦虑型': 1 },
  '明厨明卫': { '置换改善型': 2 },
  '近地铁': { '婚房刚需型': 2 },
  '地铁房': { '婚房刚需型': 2 },
  '人车分流': { '置换改善型': 2 },
  '近公园': { '置换改善型': 1, '隐性需求型': 1 },
  '次新房': { '婚房刚需型': 1, '置换改善型': 1, '刚需升级型': 1 },
  '有车位': { '置换改善型': 1 },
  '总价低': { '婚房刚需型': 2, '刚需升级型': 1 },
  '品牌开发商': { '置换改善型': 1, '刚需升级型': 1 },
  '婚装': { '隐性需求型': 2 },
};

// ============================================================
// 四、客户心理 → 房源加分（来源：七步法 + 访谈）
// ============================================================

function calcPsychologyBonus(buyer, property) {
  let bonus = 0;
  const style = buyer.decisionStyle;
  const type = buyer.type;

  // 对比型 — 性价比突出
  if (style === '对比型' && property.priceAdvantage >= 7) bonus += 2;

  // 谨慎型 — 无硬伤、产权清晰
  if (style === '谨慎型' && property.isFiveYearOnly && !property.isGroundFloor && !property.isTopFloor) {
    bonus += 2;
  }

  // 感性/冲动型（隐性需求、刚需升级）— 装修亮眼
  if ((style === '冲动型' || type === '隐性需求型') && ['豪装'].some(t => property.highlightTags.includes(t))) {
    bonus += 3;
  }
  if ((style === '冲动型' || type === '刚需升级型') && ['豪装', '婚装'].some(t => property.highlightTags.includes(t))) {
    bonus += 2;
  }

  // 置换改善 — 人车分流+绿化好
  if (type === '置换改善型' && property.highlightTags.includes('人车分流') && property.communityQuality >= 8) {
    bonus += 1;
  }

  return Math.min(bonus, 3);
}

// ============================================================
// 五、阶段 1：硬约束过滤
// ============================================================

function hardFilter(buyer, properties) {
  // 反推真实预算上限
  const loanCoefficient = 180; // 简化：30年贷款系数
  const maxLoan = buyer.monthlyPaymentCapacity * loanCoefficient / 10000;
  const realBudgetMax = Math.max(
    buyer.budgetMax,
    (buyer.downPayment + maxLoan) * 0.9
  );

  return properties.filter(p => {
    // F1: 预算上限（真实上限×1.1）
    if (p.totalPrice > realBudgetMax * 1.1) return false;

    // F2: 区域不匹配
    const districtMatch = buyer.targetDistricts.some(d => p.district.startsWith(d));
    if (!districtMatch) return false;

    // F3: 房龄超标
    if (p.buildingAge > buyer.buildingAgeMax) return false;

    // F4: 必须学区
    if (buyer.schoolDistrictRequired && !p.isSchoolDistrict) return false;
    if (buyer.schoolDistrictRequired && buyer.targetSchools && !buyer.targetSchools.includes(p.schoolName)) return false;

    // F5: 排斥项
    if (buyer.resistFactors.includes('底层') && p.isGroundFloor) return false;
    if (buyer.resistFactors.includes('顶楼') && p.isTopFloor) return false;
    if (buyer.resistFactors.includes('临街') && (p.highlightTags.includes('临街') || p.communityQuality <= 3)) return false;

    // F6: 特殊需求
    if (buyer.specialRequirements.includes('车位或可租车位') && p.parking === '无') return false;
    if (buyer.specialRequirements.includes('电梯') && !p.highlightTags.includes('电梯') && p.floorLevel !== '低') {
      // 简单判断：如果是低楼层且没有电梯标签，可能无电梯
    }
    if (buyer.specialRequirements.includes('人车分流') && !p.highlightTags.includes('人车分流')) return false;

    // F7: 面积硬下限
    if (p.area < buyer.areaMin * 0.85) return false;

    return true;
  });
}

// ============================================================
// 六、阶段 2：加权评分
// ============================================================

function scoreDimension(buyer, property, weights) {
  const scores = {};

  // D1: 价格优势
  scores.priceAdvantage = property.priceAdvantage / 10;

  // D2: 户型匹配
  const layoutExact = buyer.preferredLayouts.includes(property.layout);
  const layoutPartial = buyer.preferredLayouts.some(pl => {
    const pMatch = pl.match(/(\d+)室(\d+)厅/);
    const propMatch = property.layout.match(/(\d+)室(\d+)厅/);
    if (pMatch && propMatch) {
      const pRooms = parseInt(pMatch[1]);
      const propRooms = parseInt(propMatch[1]);
      return pRooms === propRooms; // 室数相同算部分匹配
    }
    return false;
  });
  scores.layoutMatch = layoutExact ? 1.0 : layoutPartial ? 0.6 : 0.3;

  // D3: 面积匹配
  if (property.area >= buyer.areaMin && property.area <= buyer.areaMax) {
    scores.areaMatch = 1.0;
  } else if (property.area >= buyer.areaMin * 0.85 && property.area <= buyer.areaMax * 1.15) {
    const center = (buyer.areaMin + buyer.areaMax) / 2;
    const deviation = Math.abs(property.area - center) / center;
    scores.areaMatch = Math.max(0.3, 1 - deviation * 2);
  } else {
    scores.areaMatch = 0.2;
  }

  // D4: 装修品质
  const decorationMap = { '豪装': 1.0, '精装': 0.75, '简装': 0.4, '毛坯': 0.2 };
  const requiredDecoMap = { '豪装': 1.0, '精装': 0.75, '简装': 0.4, '不限': 0.0 };
  const requiredLevel = requiredDecoMap[buyer.decorationRequirement] || 0.5;
  const actualLevel = decorationMap[property.decoration] || 0.5;
  scores.decoration = actualLevel >= requiredLevel ? 1.0 : actualLevel / Math.max(requiredLevel, 0.1);

  // D5: 学区匹配
  if (!buyer.schoolDistrictRequired) {
    scores.schoolMatch = 1.0; // 不在乎学区，不影响评分
  } else {
    if (buyer.targetSchools && buyer.targetSchools.includes(property.schoolName)) {
      scores.schoolMatch = 1.0;
    } else if (property.isSchoolDistrict) {
      scores.schoolMatch = 0.5;
    } else {
      scores.schoolMatch = 0.0;
    }
  }

  // D6: 交通便利
  scores.transport = property.transportScore / 10;

  // D7: 小区品质
  scores.community = property.communityQuality / 10;

  // D8: 楼层匹配
  const floorMap = { '低': 0, '中': 1, '高': 2 };
  const buyerFloor = floorMap[buyer.floorPreference] !== undefined ? floorMap[buyer.floorPreference] : 1;
  const propFloor = floorMap[property.floorLevel] !== undefined ? floorMap[property.floorLevel] : 1;
  const floorDiff = Math.abs(buyerFloor - propFloor);
  scores.floorMatch = floorDiff === 0 ? 1.0 : floorDiff === 1 ? 0.6 : 0.3;

  // D9: 朝向匹配
  if (buyer.preferredOrientations.includes('不限')) {
    scores.orientation = 0.8;
  } else {
    const orientExact = buyer.preferredOrientations.some(o => property.orientation.includes(o));
    const orientPartial = buyer.preferredOrientations.some(o => property.orientation.includes(o.replace('南北通透', '南').replace('南向', '南')));
    scores.orientation = orientExact ? 1.0 : orientPartial ? 0.5 : 0.2;
  }

  // D10: 周边配套
  scores.surrounding = property.surroundingScore / 10;

  // 加权汇总
  let totalScore = 0;
  let totalWeight = 0;
  for (const [key, weight] of Object.entries(weights)) {
    if (scores[key] !== undefined) {
      totalScore += scores[key] * weight;
      totalWeight += weight;
    }
  }

  return {
    totalScore: totalWeight > 0 ? (totalScore / totalWeight) * 100 : 0,
    breakdown: scores,
  };
}

// ============================================================
// 七、阶段 3：智能择优（卖点 + 心理加分）
// ============================================================

function calcHighlightBonus(buyerType, property) {
  let bonus = 0;
  for (const tag of property.highlightTags) {
    const tagBonus = HIGHLIGHT_BONUS[tag];
    if (tagBonus && tagBonus[buyerType]) {
      bonus += tagBonus[buyerType];
    }
  }
  return Math.min(bonus, 5);
}

// ============================================================
// 八、主匹配函数
// ============================================================

function matchBuyer(buyer, properties, topN = 5) {
  const weights = WEIGHT_TEMPLATES[buyer.type] || WEIGHT_TEMPLATES['婚房刚需型'];

  // 阶段 1: 硬约束过滤
  const candidates = hardFilter(buyer, properties);

  // 阶段 2: 加权评分
  const scored = candidates.map(p => {
    const { totalScore, breakdown } = scoreDimension(buyer, p, weights);
    return { property: p, stage2Score: totalScore, breakdown };
  });

  // 阶段 3: 智能择优
  const final = scored.map(s => {
    const highlightBonus = calcHighlightBonus(buyer.type, s.property);
    const psychBonus = calcPsychologyBonus(buyer, s.property);
    const finalScore = s.stage2Score + highlightBonus + psychBonus;
    return {
      ...s,
      highlightBonus,
      psychBonus,
      finalScore,
      level: finalScore >= 90 ? '强烈推荐' : finalScore >= 80 ? '推荐' : finalScore >= 70 ? '备选' : '不推荐',
    };
  });

  // 排序
  final.sort((a, b) => b.finalScore - a.finalScore);
  return final.slice(0, topN);
}

// ============================================================
// 九、沟通策略生成
// ============================================================

const STRATEGY_TEMPLATES = {
  '婚房刚需型': {
    style: '财务顾问+生活规划师',
    keyScript: (p, buyer) => `这套${p.layout}总价${p.totalPrice}万，首付约${Math.round(p.totalPrice*0.2)}万，月供大概${Math.round(p.totalPrice*0.8*0.0045*10000)}元。两居的客厅够大，以后改成三居也完全没问题。`,
    precautions: ['帮客户算清"多花10万首付=未来5年不换房"这笔账', '关注女方感受，感性决策占比大'],
    followUp: '首次推荐后2天发对比分析，1周内约带看',
  },
  '学区焦虑型': {
    style: '政策专家+数据提供者',
    keyScript: (p, buyer) => `这套对口${p.schoolName}，近3年划片都没有变动，入学年限满足要求，学位也未被占用。这是去年该小区划片文件和升学率数据。`,
    precautions: ['必须准备书面证据：划片文件、学位占用情况', '客户严谨较真，不要口头承诺'],
    followUp: '首次推荐后立即发学区资料，3天内约实地看房',
  },
  '置换改善型': {
    style: '全流程管家',
    keyScript: (p, buyer) => `这套${p.layout}目前在售。您的老房子预计能卖${buyer.oldHouseEstimatedValue || 120}万，这套${p.totalPrice}万，贷款${p.totalPrice - (buyer.oldHouseEstimatedValue || 120)}万左右。如果两边节奏配合好，可以实现无缝衔接。`,
    precautions: ['提供"卖+买"一体化时间线方案', '决策链长，尽量约全家人一起看'],
    followUp: '了解老房子挂牌进展，同步推送新上房源',
  },
  '隐性需求型': {
    style: '需求翻译官+引导者',
    keyScript: (p, buyer) => `不用急着定，我们先多看几套对比一下。这套装修是亮点，您看这个阳台，以后周末在这里喝喝茶，感觉很舒服的。`,
    precautions: ['同一天带看2套差异大的房源做对比', '看房后引导客户说出喜欢/不喜欢哪里'],
    followUp: '每次带看后现场复盘感受，逐步收敛需求',
  },
  '刚需升级型': {
    style: '品质推手+性价比计算器',
    keyScript: (p, buyer) => `这套虽然比您预算多了点，但多一个独立书房和主卧套间。多花10万首付，月供只多500块，未来5年不用换房。`,
    precautions: ['先推达标房源再推品质房源，形成对比', '让客户看到"价值差"而不是"价格差"'],
    followUp: '先推一套80万，再推120万，让客户自己感受差异',
  },
};

function generateStrategy(buyer, property) {
  const template = STRATEGY_TEMPLATES[buyer.type] || STRATEGY_TEMPLATES['婚房刚需型'];
  return {
    style: template.style,
    openingScript: template.keyScript(property, buyer),
    precautions: template.precautions,
    followUp: template.followUp,
  };
}

// ============================================================
// 十、格式化输出
// ============================================================

// 生成坦诚缺点（来自蓝领岗位匹配的启发：坦诚 > 隐瞒）
function generateHonestCons(property) {
  const cons = [];
  if (property.buildingAge >= 20) cons.push('房龄较老，需关注管道老化和渗水情况');
  if (property.buildingAge >= 25) cons.push('房龄超过25年，贷款年限可能受限');
  if (property.decoration === '简装') cons.push('装修简单，入住前可能需翻新');
  if (property.decoration === '毛坯') cons.push('毛坯房，需额外准备装修预算约10-15万');
  if (property.isGroundFloor) cons.push('底层，需关注防潮和隐私问题');
  if (property.isTopFloor) cons.push('顶楼，夏季较热，需关注防水');
  if (property.parking === '无') cons.push('无车位，周边停车可能不便');
  if (property.communityQuality <= 4) cons.push('小区品质一般，绿化物业配套有限');
  if (property.transportScore <= 5) cons.push('交通便利度一般，公交/地铁覆盖较少');
  if (property.surroundingScore <= 5) cons.push('周边商业配套有限，生活便利度较低');
  if (!property.isFiveYearOnly && property.buildingAge < 5) cons.push('不满五，交易税费较高');
  if (property.floorLevel === '低' && !property.isGroundFloor) cons.push('低楼层，采光可能受遮挡影响');
  if (property.floorLevel === '高' && !property.isTopFloor && property.communityQuality <= 5) cons.push('高楼层，需确认电梯运行状况');
  if (!property.isSchoolDistrict && property.district.includes('天宁区-文化宫')) cons.push('非学区房，天宁区核心学区客户需注意');
  if (property.priceDropSpace <= 5) cons.push('业主议价空间较小，谈价弹性有限');
  return cons.length > 0 ? cons : ['无明显硬伤，整体较为均衡'];
}

function printResults(buyer, results) {
  console.log(`\n${'='.repeat(70)}`);
  console.log(`🎯 客户：${buyer.name}（${buyer.type}）`);
  console.log(`   口述预算：${buyer.surfaceBudget}万 | 首付：${buyer.downPayment}万 | 月供承受：${buyer.monthlyPaymentCapacity}元`);
  console.log(`   目标区域：${buyer.targetDistricts.join('、')}`);
  console.log(`   核心关注：${buyer.coreConcerns.join(' > ')}`);
  console.log(`${'='.repeat(70)}`);

  if (results.length === 0) {
    console.log(`\n⚠️  无匹配房源。建议：`);
    if (buyer.budgetMax < 100) console.log(`   → 预算偏低，考虑提高预算或扩大区域`);
    if (buyer.schoolDistrictRequired) console.log(`   → 学区要求严格，建议扩大目标学校范围`);
    return;
  }

  results.forEach((r, i) => {
    const p = r.property;
    const s = generateStrategy(buyer, p);
    console.log(`\n${'─'.repeat(70)}`);
    console.log(`🏠 #${i + 1}  [${r.level}]  ${p.community} · ${p.layout} · ${p.totalPrice}万`);
    console.log(`   综合分：${r.finalScore.toFixed(1)}  (基础${r.stage2Score.toFixed(1)} + 卖点${r.highlightBonus} + 心理${r.psychBonus})`);
    console.log(`   区域：${p.district} | 面积：${p.area}㎡ | 楼层：${p.floor} | 朝向：${p.orientation}`);
    console.log(`   装修：${p.decoration} | 房龄：${p.buildingAge}年 | 学区：${p.isSchoolDistrict ? p.schoolName : '无'}`);
    console.log(`   亮点：${p.highlightTags.join(' · ')}`);
    console.log(`   业主：${p.ownerSituation} | 议价空间：${p.priceDropSpace}万`);

    // 坦诚缺点（来自蓝领匹配启发）
    const cons = generateHonestCons(p);
    console.log(`   ⚠️  坦诚提醒：${cons.join('；')}`);

    // 评分分解
    const bd = r.breakdown;
    console.log(`   📊 维度分解：价格${(bd.priceAdvantage*100).toFixed(0)} | 户型${(bd.layoutMatch*100).toFixed(0)} | 面积${(bd.areaMatch*100).toFixed(0)} | 装修${(bd.decoration*100).toFixed(0)} | 交通${(bd.transport*100).toFixed(0)} | 品质${(bd.community*100).toFixed(0)} | 楼层${(bd.floorMatch*100).toFixed(0)} | 朝向${(bd.orientation*100).toFixed(0)}`);

    console.log(`\n   💬 沟通策略（${s.style}）：`);
    console.log(`   "${s.openingScript}"`);
    console.log(`   ⚠️  注意事项：${s.precautions.join('；')}`);
    console.log(`   📅 跟进节奏：${s.followUp}`);
  });

  console.log(`\n${'─'.repeat(70)}`);
  console.log(`📊 筛选统计：全量${30}套 → 硬约束过滤后${results.length > 0 ? '匹配' : '0'}套 → Top-${results.length}`);
  console.log(`${'='.repeat(70)}\n`);
}

// ============================================================
// 十一、入口
// ============================================================

function main() {
  const { buyers, properties } = loadData();

  // 命令行参数
  const args = process.argv.slice(2);
  const buyerId = args.includes('--buyer') ? args[args.indexOf('--buyer') + 1] : null;
  const topIdx = args.includes('--top') ? args.indexOf('--top') : -1;
  const topN = topIdx >= 0 ? parseInt(args[topIdx + 1]) || 5 : 5;

  const targets = buyerId
    ? buyers.filter(b => b.id === buyerId)
    : buyers;

  if (targets.length === 0) {
    console.error(`❌ 未找到客户 ${buyerId}`);
    console.error(`   可用客户ID：${buyers.map(b => b.id).join(', ')}`);
    process.exit(1);
  }

  targets.forEach(buyer => {
    const results = matchBuyer(buyer, properties, topN);
    printResults(buyer, results);
  });
}

if (require.main === module) {
  main();
}

// 导出供外部调用
module.exports = { matchBuyer, generateStrategy, hardFilter, WEIGHT_TEMPLATES, STRATEGY_TEMPLATES };