#!/usr/bin/env node
const fs = require('fs');
const path = require('path');

const DEFAULT_RESULT_PREFIX = 'INDUSTRY_TREND_REPORT_RESULT';

const SIGNAL_DICTIONARY = {
  style: [
    '奶油风', '原木风', '中古风', '法式', '侘寂', '极简', '现代', '轻奢',
    '北欧', '复古', '黑白灰', '松弛感', '温柔', '高级感'
  ],
  element: [
    '弧形', '一门到顶', '玻璃柜', '开放格', '灯带', '木纹', '隐形拉手',
    '肤感膜', '柜门', '岛台', '餐边柜', '玄关柜', '衣柜', '橱柜', '抽屉',
    '无主灯', '收纳', '转角', '嵌入式'
  ],
  decision: [
    '预算', '环保', '甲醛', '翻车', '好打理', '耐看', '显大', '采光',
    '落灰', '售后', '增项', '尺寸', '动线', '收纳不够', '柜子太满',
    '怕过时', '质感'
  ],
  action: [
    '避坑', '怎么选', '真实体验', '对比', '测评', '后悔', '建议', '清单',
    '案例', '改造', '装修日记'
  ]
};

function parseArgs(argv) {
  const args = {};
  for (let i = 0; i < argv.length; i++) {
    const token = argv[i];
    if (!token.startsWith('--')) continue;
    const eq = token.indexOf('=');
    if (eq >= 0) {
      args[token.slice(2, eq)] = token.slice(eq + 1);
    } else {
      const key = token.slice(2);
      const next = argv[i + 1];
      if (next && !next.startsWith('--')) {
        args[key] = next;
        i++;
      } else {
        args[key] = true;
      }
    }
  }
  return args;
}

function ensureDir(dirPath) {
  fs.mkdirSync(dirPath, { recursive: true });
}

function readJson(filePath) {
  return JSON.parse(fs.readFileSync(filePath, 'utf8'));
}

function writeJson(filePath, data) {
  fs.writeFileSync(filePath, JSON.stringify(data, null, 2), 'utf8');
}

function asArray(value) {
  if (!value) return [];
  return Array.isArray(value) ? value : [value];
}

function cleanText(value) {
  return String(value || '').replace(/\s+/g, ' ').trim();
}

function truncate(value, length = 72) {
  const text = cleanText(value);
  if (text.length <= length) return text;
  return `${text.slice(0, Math.max(0, length - 1))}…`;
}

function uniq(values) {
  return [...new Set(values.filter(value => value !== undefined && value !== null && value !== ''))];
}

function parseList(value) {
  if (!value) return [];
  if (Array.isArray(value)) return value.map(String).map(item => item.trim()).filter(Boolean);
  const text = String(value).trim();
  if (!text) return [];
  if (text.startsWith('[')) {
    try {
      const parsed = JSON.parse(text);
      return Array.isArray(parsed) ? parsed.map(String).map(item => item.trim()).filter(Boolean) : [];
    } catch {
      return [];
    }
  }
  return text.split(/[,，、;\n\r]+/).map(item => item.trim()).filter(Boolean);
}

function normalizeCount(value) {
  const numeric = Number(value || 0);
  return Number.isFinite(numeric) ? numeric : 0;
}

function noteScore(note) {
  return normalizeCount(note.likeCount) +
    normalizeCount(note.collectCount) * 1.5 +
    normalizeCount(note.commentCount) * 3 +
    normalizeCount(note.shareCount) * 2;
}

function commentScore(comment) {
  return normalizeCount(comment.likeCount) * 2 + cleanText(comment.text || comment.content).length / 30;
}

function countSignals(records, terms) {
  const counts = new Map();
  records.forEach(record => {
    const text = `${record.title || ''} ${record.content || ''} ${record.text || ''}`.toLowerCase();
    terms.forEach(term => {
      if (text.includes(String(term).toLowerCase())) {
        counts.set(term, (counts.get(term) || 0) + 1);
      }
    });
  });
  return [...counts.entries()]
    .map(([label, count]) => ({ label, count }))
    .sort((a, b) => b.count - a.count || String(a.label).localeCompare(String(b.label)));
}

function isHomeDesignIndustry(profile) {
  const text = [
    profile.industry,
    profile.businessType,
    ...asArray(profile.keywords),
    ...asArray(profile.mustTrackSignals)
  ].join(' ');
  return /家装|全屋定制|装修|衣柜|橱柜|门店|设计师/.test(text);
}

function countProfileSignals(records, profile) {
  const terms = uniq([
    ...asArray(profile.mustTrackSignals),
    ...asArray(profile.trendQuestions).flatMap(question => String(question).split(/[、，,。？?\s]+/)),
    ...asArray(profile.keywords).slice(0, 8)
  ]).filter(term => String(term).length >= 2);
  return countSignals(records, terms).slice(0, 10);
}

function buildOneLine(profile, styleSignals, elementSignals, decisionSignals, profileSignals) {
  if (isHomeDesignIndustry(profile)) {
    return '本轮最值得关注的不是单一风格，而是“风格审美 + 好打理 + 收纳/预算风险”一起进入女性客户决策。';
  }
  const topTopic = profileSignals[0]?.label || elementSignals[0]?.label || styleSignals[0]?.label || '高互动内容主题';
  const topDecision = decisionSignals[0]?.label || '用户真实顾虑';
  return `本轮最值得关注的是“${topTopic} + ${topDecision} + 可验证行动机会”的组合，而不是单条爆款样本。`;
}

function keywordMatrixFromProfile(profile) {
  const baseKeywords = uniq([
    ...asArray(profile.keywords),
    ...asArray(profile.productsOrServices).slice(0, 4),
    profile.industry
  ]).filter(Boolean);

  const questions = asArray(profile.trendQuestions);
  const matrix = baseKeywords.slice(0, 12).map((keyword, index) => ({
    keyword,
    batch: 'P0',
    purpose: index === 0 ? '抓取行业基础讨论' : '追踪趋势与用户决策信号',
    expectedSignal: asArray(profile.mustTrackSignals).slice(0, 6).join('、') || '趋势、痛点、决策、内容机会',
    source: 'profile'
  }));

  questions.slice(0, 4).forEach(question => {
    const keyword = question.replace(/[？?。,.，]/g, '').slice(0, 18);
    if (keyword && !matrix.some(row => row.keyword === keyword)) {
      matrix.push({
        keyword,
        batch: 'P1',
        purpose: '回答趋势问题',
        expectedSignal: question,
        source: 'trendQuestion'
      });
    }
  });

  return matrix;
}

function buildSampleDataset(profile, keywordMatrix) {
  const keywords = keywordMatrix.length ? keywordMatrix.map(row => row.keyword) : parseList(profile.keywords);
  const seed = keywords.length ? keywords : ['全屋定制', '奶油风装修', '小户型收纳'];
  const notes = [
    {
      id: 'xhs-home-001',
      platform: 'xiaohongshu',
      keyword: seed[0],
      title: '全屋定制最容易翻车的不是价格，是柜子做完不好住',
      content: '评论里很多女生说，装修前只看了奶油风效果图，真正入住后才发现开放格落灰、柜门不好打理、收纳不够。全屋定制要先想生活动线，再看风格。',
      author: '住进理想家',
      likeCount: 4280,
      collectCount: 1900,
      commentCount: 386,
      shareCount: 220,
      url: 'https://www.xiaohongshu.com/explore/sample-home-001',
      tags: ['全屋定制', '装修避坑', '收纳']
    },
    {
      id: 'xhs-home-002',
      platform: 'xiaohongshu',
      keyword: seed[1] || seed[0],
      title: '奶油风下半年还会流行吗？关键看材质和灯光',
      content: '奶油风不是越白越好看，真正高级的是低饱和颜色、木纹、弧形和无主灯配合。很多人担心过时，评论更关心耐看、好打理、显大。',
      author: '软装设计阿晴',
      likeCount: 6920,
      collectCount: 4100,
      commentCount: 612,
      shareCount: 488,
      url: 'https://www.xiaohongshu.com/explore/sample-home-002',
      tags: ['奶油风', '装修风格', '设计元素']
    },
    {
      id: 'xhs-home-003',
      platform: 'xiaohongshu',
      keyword: seed[2] || seed[0],
      title: '小户型收纳别再一屋子柜子，女生真正怕的是压抑',
      content: '一门到顶、玄关柜、餐边柜都很火，但评论区反复提到采光、显大、动线和预算。收纳不是柜子越多越好，而是高频物品要顺手。',
      author: '小户型研究所',
      likeCount: 5110,
      collectCount: 2800,
      commentCount: 455,
      shareCount: 306,
      url: 'https://www.xiaohongshu.com/explore/sample-home-003',
      tags: ['小户型', '收纳', '玄关柜']
    },
    {
      id: 'xhs-home-004',
      platform: 'xiaohongshu',
      keyword: seed[3] || seed[0],
      title: '衣柜设计避坑：肤感膜、玻璃柜、开放格到底怎么选',
      content: '高赞评论都在问环保、落灰、预算和售后。女性客户不是不喜欢设计感，而是怕好看但不好住、好看但难打理。',
      author: '定制柜设计师Lynn',
      likeCount: 3760,
      collectCount: 2100,
      commentCount: 334,
      shareCount: 180,
      url: 'https://www.xiaohongshu.com/explore/sample-home-004',
      tags: ['衣柜设计', '环保', '好打理']
    }
  ];

  const comments = [
    { id: 'c001', noteId: 'xhs-home-001', keyword: notes[0].keyword, text: '我家就是开放格太多，现在每天擦灰，真的后悔。', likeCount: 92, theme: '翻车风险' },
    { id: 'c002', noteId: 'xhs-home-001', keyword: notes[0].keyword, text: '全屋定制最怕增项，前期报价看不懂，后面预算一路涨。', likeCount: 118, theme: '预算顾虑' },
    { id: 'c003', noteId: 'xhs-home-002', keyword: notes[1].keyword, text: '奶油风好看但怕过时，想要耐看一点的，不要太网红。', likeCount: 156, theme: '风格决策' },
    { id: 'c004', noteId: 'xhs-home-002', keyword: notes[1].keyword, text: '低饱和颜色加木纹真的比纯白高级，灯光也很重要。', likeCount: 84, theme: '设计元素' },
    { id: 'c005', noteId: 'xhs-home-003', keyword: notes[2].keyword, text: '小户型柜子做满会很压抑，还是要留一点呼吸感。', likeCount: 121, theme: '空间体验' },
    { id: 'c006', noteId: 'xhs-home-003', keyword: notes[2].keyword, text: '我最关心玄关能不能放下鞋子、包、快递和雨伞。', likeCount: 77, theme: '使用场景' },
    { id: 'c007', noteId: 'xhs-home-004', keyword: notes[3].keyword, text: '肤感膜到底好不好打理？有小孩家庭是不是很容易留印子？', likeCount: 103, theme: '材质顾虑' },
    { id: 'c008', noteId: 'xhs-home-004', keyword: notes[3].keyword, text: '环保真的要讲清楚，不然再好看也不敢下单。', likeCount: 141, theme: '信任门槛' }
  ];

  return {
    metadata: {
      platform: 'xiaohongshu',
      dataNature: 'P0 sample dataset',
      generatedAt: new Date().toISOString()
    },
    notes,
    comments
  };
}

function normalizeDataset(input) {
  if (!input) return { notes: [], comments: [] };
  if (Array.isArray(input)) return { notes: input, comments: [] };
  return {
    metadata: input.metadata || {},
    notes: asArray(input.notes || input.items),
    comments: asArray(input.comments || input.commentsFlat)
  };
}

function buildTrendHypotheses(profile, styleSignals, elementSignals, decisionSignals, profileSignals = []) {
  const industry = profile.industry || '当前行业';
  const audience = asArray(profile.targetAudience)[0] || '目标客户';
  const topStyle = styleSignals[0]?.label || '高互动风格';
  const topElement = elementSignals[0]?.label || profileSignals[0]?.label || '高频内容元素';
  const topDecision = decisionSignals[0]?.label || '关键决策顾虑';
  if (!isHomeDesignIndustry(profile)) {
    return [
      {
        title: `${topElement} 可以作为下周期内容和产品沟通的切入点`,
        confidence: elementSignals[0] || profileSignals[0] ? '中' : '低',
        action: `把 ${topElement} 拆成“用户为什么关心、现在怎么判断、下一步怎么验证”三个回答。`
      },
      {
        title: `${audience} 的核心阻力不是没有兴趣，而是担心 ${topDecision}`,
        confidence: decisionSignals[0] ? '中' : '低',
        action: `内容和销售话术要先回应 ${topDecision}，再展示 ${industry} 的方案优势。`
      },
      {
        title: `高互动样本更适合沉淀为“趋势假设”，不要直接照搬结论`,
        confidence: '中',
        action: '把高互动样本拆成主题、证据、评论原声和可验证动作，再决定是否进入下轮监听。'
      }
    ];
  }
  return [
    {
      title: `${topStyle} 仍有热度，但用户会从“好看”追问到“耐看和好打理”`,
      confidence: styleSignals[0] ? '中' : '低',
      action: `整理 3 套 ${topStyle} 的真实案例，重点讲清颜色、材质、灯光和维护成本。`
    },
    {
      title: `${topElement} 可以作为下周期内容和门店讲解的切入点`,
      confidence: elementSignals[0] ? '中' : '低',
      action: `把 ${topElement} 拆成“适合什么户型、不适合什么家庭、预算影响”三个回答。`
    },
    {
      title: `${audience} 的核心阻力不是不喜欢设计，而是担心 ${topDecision}`,
      confidence: decisionSignals[0] ? '中' : '低',
      action: `销售和设计师话术要先回应 ${topDecision}，再展示 ${industry} 的方案优势。`
    }
  ];
}

function buildSuggestedActions(profile) {
  if (isHomeDesignIndustry(profile)) {
    return [
      '门店：把高频顾虑整理成“预算、环保、好打理、收纳”四张解释卡。',
      '设计师：讲方案时先回应翻车风险，再展示风格效果图。',
      '内容：优先拍“真实案例 + 避坑 + 选择标准”，少发无评论支撑的纯美图。'
    ];
  }
  return [
    '内容：优先选择“真实案例 + 用户顾虑 + 判断标准”的选题，不要只搬运高互动标题。',
    '产品/服务：把高频评论里的疑问整理成可验证假设，下一轮用样本继续确认。',
    '销售/转化：先回应用户最担心的阻力，再给方案、案例或对比证据。'
  ];
}

function buildCalibrationQuestions(profile) {
  if (isHomeDesignIndustry(profile)) {
    return [
      '今天这些风格/元素里，哪 3 个最值得继续跟踪？',
      '哪些方向明显不适合你的客户或门店定位？',
      '下一版更偏设计趋势、客户决策、门店转化，还是小红书内容选题？',
      '是否要新增关注区域、户型、预算带或竞品品牌？'
    ];
  }
  return [
    '今天这些趋势信号里，哪 3 个最值得继续跟踪？',
    '哪些方向明显不适合你的客户、产品或品牌定位？',
    '下一版更偏趋势判断、用户洞察、内容选题、销售转化，还是竞品观察？',
    '是否要新增关注平台、关键词、人群、价格带或竞品品牌？'
  ];
}

function markdownTable(rows, headers) {
  const safeRows = rows.length ? rows : [headers.map(() => '暂无')];
  return [
    `| ${headers.join(' | ')} |`,
    `| ${headers.map(() => '---').join(' | ')} |`,
    ...safeRows.map(row => `| ${row.map(cell => String(cell ?? '').replace(/\|/g, '/')).join(' | ')} |`)
  ].join('\n');
}

function buildReport({ profile, dataset, keywordMatrix, outputDir }) {
  const normalized = normalizeDataset(dataset);
  const notes = normalized.notes;
  const comments = normalized.comments;
  const allRecords = [...notes, ...comments];
  const styleSignals = countSignals(allRecords, SIGNAL_DICTIONARY.style);
  const elementSignals = countSignals(allRecords, SIGNAL_DICTIONARY.element);
  const decisionSignals = countSignals(allRecords, SIGNAL_DICTIONARY.decision);
  const actionSignals = countSignals(allRecords, SIGNAL_DICTIONARY.action);
  const profileSignals = countProfileSignals(allRecords, profile);
  const highValueNotes = [...notes].sort((a, b) => noteScore(b) - noteScore(a)).slice(0, 5);
  const highValueComments = [...comments].sort((a, b) => commentScore(b) - commentScore(a)).slice(0, 8);
  const trendHypotheses = buildTrendHypotheses(profile, styleSignals, elementSignals, decisionSignals, profileSignals);
  const suggestedActions = buildSuggestedActions(profile);
  const calibrationQuestions = buildCalibrationQuestions(profile);
  const keywordRows = keywordMatrix.slice(0, 8).map(row => [
    row.keyword,
    row.purpose || '趋势监听',
    row.expectedSignal || '趋势/痛点/决策信号'
  ]);
  const sampleLine = `${notes.length} 篇笔记 / ${comments.length} 条评论 / ${uniq(notes.map(note => note.keyword)).length || keywordMatrix.length} 个关键词`;
  const oneLine = buildOneLine(profile, styleSignals, elementSignals, decisionSignals, profileSignals);

  const report = {
    status: 'ok',
    project: profile.project || 'industry-trend-intelligence',
    industry: profile.industry || '未填写行业',
    generatedAt: new Date().toISOString(),
    sample: {
      noteCount: notes.length,
      commentCount: comments.length,
      keywordCount: uniq(notes.map(note => note.keyword)).length || keywordMatrix.length
    },
    oneLineJudgement: oneLine,
    signals: {
      style: styleSignals.slice(0, 8),
      element: elementSignals.slice(0, 8),
      decision: decisionSignals.slice(0, 8),
      action: actionSignals.slice(0, 8),
      profile: profileSignals.slice(0, 8)
    },
    highValueNotes,
    highValueComments,
    trendHypotheses,
    keywordMatrix
  };

  const signalLines = [
    profileSignals.length ? `- 重点信号：${profileSignals.slice(0, 5).map(item => `${item.label}(${item.count})`).join('、')}` : '',
    `- 风格信号：${styleSignals.slice(0, 5).map(item => `${item.label}(${item.count})`).join('、') || '暂无明显风格词'}`,
    `- 内容/元素：${elementSignals.slice(0, 5).map(item => `${item.label}(${item.count})`).join('、') || '暂无明显元素词'}`,
    `- 决策顾虑：${decisionSignals.slice(0, 5).map(item => `${item.label}(${item.count})`).join('、') || '暂无明显顾虑词'}`
  ].filter(Boolean);

  const assistantMessage = [
    `# 行业趋势情报日报`,
    '',
    `行业：${report.industry}`,
    `样本：${sampleLine}`,
    '',
    `## 一句话判断`,
    '',
    oneLine,
    '',
    `## 高热趋势信号`,
    '',
    ...signalLines,
    '',
    `## 高价值样本`,
    '',
    ...highValueNotes.slice(0, 3).map((note, index) => {
      return `${index + 1}. ${truncate(note.title, 42)} / ${note.author || '未知作者'} / 点赞 ${normalizeCount(note.likeCount)} / 评论 ${normalizeCount(note.commentCount)} / 收藏 ${normalizeCount(note.collectCount)}`;
    }),
    '',
    `## 下周期可验证趋势假设`,
    '',
    ...trendHypotheses.map((item, index) => `${index + 1}. ${item.title}（置信度：${item.confidence}）`),
    '',
    `## 建议动作`,
    '',
    ...suggestedActions.map(item => `- ${item}`),
    '',
    `## 校准问题`,
    '',
    ...calibrationQuestions.map((item, index) => `${index + 1}. ${item}`)
  ].join('\n');

  const fullMarkdown = [
    assistantMessage,
    '',
    `## 关键词矩阵`,
    '',
    markdownTable(keywordRows, ['关键词', '采集目的', '预期信号']),
    '',
    `## 高赞评论原声`,
    '',
    ...highValueComments.slice(0, 6).map(comment => `- ${comment.text || comment.content}（赞 ${normalizeCount(comment.likeCount)} / ${comment.theme || '未标注'}）`)
  ].join('\n');

  if (outputDir) {
    ensureDir(outputDir);
    fs.writeFileSync(path.join(outputDir, 'trend-report.md'), fullMarkdown, 'utf8');
    writeJson(path.join(outputDir, 'trend-report.json'), report);
  }

  return {
    ...report,
    assistantMessage,
    markdown: fullMarkdown,
    files: outputDir ? [
      path.join(outputDir, 'trend-report.md'),
      path.join(outputDir, 'trend-report.json')
    ] : []
  };
}

function main() {
  const args = parseArgs(process.argv.slice(2));
  const profile = args.profile ? readJson(path.resolve(args.profile)) : {};
  const input = args.input ? readJson(path.resolve(args.input)) : undefined;
  const keywordMatrix = args['keyword-matrix']
    ? readJson(path.resolve(args['keyword-matrix']))
    : keywordMatrixFromProfile(profile);
  const outputDir = args.output ? path.resolve(args.output) : undefined;
  const dataset = input || buildSampleDataset(profile, keywordMatrix);
  const result = buildReport({ profile, dataset, keywordMatrix, outputDir });
  const prefix = args['result-prefix'] || args.resultPrefix || DEFAULT_RESULT_PREFIX;
  console.log(`${prefix}=${JSON.stringify(result)}`);
}

if (require.main === module) {
  try {
    main();
  } catch (error) {
    console.error(error && error.stack ? error.stack : String(error));
    process.exit(1);
  }
}

module.exports = {
  buildReport,
  buildSampleDataset,
  keywordMatrixFromProfile,
  parseList
};