const fs = require('fs');
const path = require('path');
const { PACKAGE_ROOT, resolveWorkspaceRoot } = require('../core/runtime-context');

const PROJECT_ROOT = resolveWorkspaceRoot({ packageRoot: PACKAGE_ROOT });
const PACKAGE_KNOWLEDGE_BASE_DIR = path.join(PACKAGE_ROOT, 'knowledge-base');
const PROJECT_KNOWLEDGE_BASE_DIR = path.join(PROJECT_ROOT, 'knowledge-base');
const KNOWLEDGE_BASE_DIR = fs.existsSync(path.join(PROJECT_KNOWLEDGE_BASE_DIR, 'catalog.json'))
  ? PROJECT_KNOWLEDGE_BASE_DIR
  : PACKAGE_KNOWLEDGE_BASE_DIR;
const CATALOG_FILE = path.join(KNOWLEDGE_BASE_DIR, 'catalog.json');
const SOURCE_WORKSPACE_ROOT = path.resolve(PACKAGE_ROOT, '..', '..');
const ALLOWED_EXTENSIONS = new Set(['.md', '.json', '.csv', '.txt', '.js']);
const MAX_PREVIEW_BYTES = 2 * 1024 * 1024;

const PAGE_BY_SKILL = {
  'qiwei-real-estate-auto-reply': 'agent',
  'qiwei-agent-supervisor': 'agent',
  'qiwei-group-management': 'groups',
  'qiwei-customer-ops': 'customer-ops',
  'qiwei-portrait-tags': 'portraits',
  'qiwei-customer-transfer': 'transfers',
  'qiwei-official-meeting': 'knowledge',
  'qiwei-official-doc': 'knowledge',
  'qiwei-official-todo': 'knowledge',
  'qiwei-login': 'status',
  'qiwei-dashboard': 'status',
};

const CAPABILITY_TAGS = {
  'qiwei-api-catalog': ['100+ API', '接口文档', '通用调用'],
  'qiwei-broker-playbook': ['顾问策略', '批量生成', '导出'],
  'qiwei-capability-router': ['能力路由', '双通道', '自动选择'],
  'qiwei-customer-ops': ['批量加好友', '建群', '欢迎语'],
  'qiwei-customer-transfer': ['客户交接', '预览', '执行'],
  'qiwei-dashboard': ['本地工作台', '状态管理'],
  'qiwei-group-management': ['群识别', '回调接入', '新消息'],
  'qiwei-login': ['扫码登录', '订阅', '席位'],
  'qiwei-official-doc': ['文档知识库', 'Markdown', '官方 CLI'],
  'qiwei-official-meeting': ['会议同步', 'AI 知识沉淀', '官方 CLI'],
  'qiwei-official-todo': ['待办同步', '任务推进', '官方 CLI'],
  'qiwei-portrait-tags': ['客户画像', '标签', '批量导出'],
  'qiwei-real-estate-auto-reply': ['房产 Agent', '需求识别', '房源工具'],
  'qiwei-agent-supervisor': ['人工监管', '审核', '审计'],
  'qiwei-voice': ['语音下载', '解码', '转写'],
  'qiwei-webhook-relay': ['Webhook', 'Relay', '长轮询'],
};

function readJson(filePath, fallback = {}) {
  try { return JSON.parse(fs.readFileSync(filePath, 'utf8').replace(/^\uFEFF/, '')); }
  catch { return fallback; }
}

function packageDefinitions() {
  const definitions = [
    {
      id: 'unified-source',
      label: '统一源码版',
      description: '当前 4320 Dashboard 的主运行包，承载页面、MCP 工具和真实企微 Agent。',
      root: PACKAGE_ROOT,
      status: 'running',
    },
    ...(PROJECT_ROOT.toLowerCase() !== PACKAGE_ROOT.toLowerCase() ? [{
      id: 'customer-project',
      label: '当前客户项目',
      description: '客户项目中的自定义 Skills、知识库和业务扩展。',
      root: PROJECT_ROOT,
      skillsRoot: path.join(PROJECT_ROOT, '.claude', 'skills'),
      status: 'active',
    }] : []),
    {
      id: 'openclaw',
      label: 'OpenClaw 企微技能包',
      description: 'OpenClaw 版本的企微技能与独立 Agent 工具实现。',
      root: path.resolve(SOURCE_WORKSPACE_ROOT, '..', 'openclaw-voc-skill', 'claude-code', 'claude-code-qiwe-assistant'),
      status: 'connected',
    },
    {
      id: 'agent-workbench',
      label: '企微 Agent Workbench',
      description: 'SQLite 状态机、人工审核、暂停、审计和工具循环的来源实现。',
      root: path.join(SOURCE_WORKSPACE_ROOT, 'qiwei-agent-workbench'),
      status: 'merged',
    },
  ];
  const seenRoots = new Set();
  return definitions.filter(item => {
    if (!fs.existsSync(item.root)) return false;
    const root = path.resolve(item.root).toLowerCase();
    if (seenRoots.has(root)) return false;
    seenRoots.add(root);
    return true;
  });
}

function loadCatalog() {
  const parsed = readJson(CATALOG_FILE, { version: 1, libraries: [] });
  const libraries = (parsed.libraries || []).map(item => ({
    ...item,
    root: path.resolve(KNOWLEDGE_BASE_DIR, item.path),
    extensions: new Set((item.extensions || []).map(value => String(value).toLowerCase())),
    kind: item.id === 'property-data'
      ? 'property-library'
      : item.id === 'meeting-knowledge'
        ? 'meeting-library'
        : item.id === 'doc-knowledge'
          ? 'doc-library'
          : item.id === 'todo-knowledge'
            ? 'todo-library'
            : item.id === 'task-knowledge'
              ? 'task-library'
        : 'document-library',
  })).filter(item => item.id !== 'property-data' || fs.existsSync(item.root));
  for (const pkg of packageDefinitions()) {
    const skillsRoot = pkg.skillsRoot || path.join(pkg.root, 'skills');
    if (!fs.existsSync(skillsRoot)) continue;
    libraries.push({
      id: `skills-${pkg.id}`,
      label: `${pkg.label} · 技能说明`,
      description: 'SKILL.md 与 references 文档',
      root: skillsRoot,
      extensions: new Set(['.md', '.json', '.txt']),
      kind: 'skill-library',
    });
  }
  return { version: parsed.version || 1, libraries };
}

function encodeNodeId(libraryId, relativePath) {
  return `${libraryId}~${Buffer.from(String(relativePath || ''), 'utf8').toString('base64url')}`;
}

function decodeNodeId(nodeId) {
  const index = String(nodeId || '').indexOf('~');
  if (index < 1) throw new Error('知识库节点不存在');
  const libraryId = nodeId.slice(0, index);
  const relativePath = Buffer.from(nodeId.slice(index + 1), 'base64url').toString('utf8');
  return { libraryId, relativePath };
}

function safeNodePath(nodeId) {
  const { libraryId, relativePath } = decodeNodeId(nodeId);
  const library = loadCatalog().libraries.find(item => item.id === libraryId);
  if (!library) throw new Error('知识库目录不存在');
  const resolved = path.resolve(library.root, relativePath);
  const rootPrefix = `${path.resolve(library.root).toLowerCase()}${path.sep}`;
  if (resolved.toLowerCase() !== path.resolve(library.root).toLowerCase() && !resolved.toLowerCase().startsWith(rootPrefix)) {
    throw new Error('禁止访问知识库目录之外的文件');
  }
  return { library, filePath: resolved, relativePath };
}

function fileKind(filePath) {
  const base = path.basename(filePath).toLowerCase();
  const extension = path.extname(filePath).toLowerCase();
  if (base === 'properties.json') return 'property-dataset';
  if (base === 'skill.md') return 'skill-document';
  if (extension === '.md') return 'markdown';
  if (extension === '.json') return 'json';
  if (extension === '.csv') return 'csv';
  if (extension === '.js') return 'code';
  return 'text';
}

function buildDirectoryChildren(library, directory, relativeDir = '', depth = 0) {
  if (depth > 7 || !fs.existsSync(directory)) return [];
  const entries = fs.readdirSync(directory, { withFileTypes: true })
    .filter(entry => !entry.name.startsWith('.') && entry.name !== 'node_modules')
    .map(entry => {
      const relativePath = path.join(relativeDir, entry.name);
      const fullPath = path.join(directory, entry.name);
      if (entry.isDirectory()) {
        const children = buildDirectoryChildren(library, fullPath, relativePath, depth + 1);
        if (!children.length) return null;
        return {
          id: encodeNodeId(library.id, relativePath),
          name: entry.name,
          type: 'folder',
          children,
          fileCount: children.reduce((sum, item) => sum + (item.type === 'file' ? 1 : item.fileCount || 0), 0),
        };
      }
      const extension = path.extname(entry.name).toLowerCase();
      if (!ALLOWED_EXTENSIONS.has(extension) || !library.extensions.has(extension)) return null;
      const stats = fs.statSync(fullPath);
      return {
        id: encodeNodeId(library.id, relativePath),
        name: entry.name,
        type: 'file',
        kind: fileKind(fullPath),
        size: stats.size,
        modifiedAt: stats.mtime.toISOString(),
        relativePath: relativePath.replace(/\\/g, '/'),
      };
    })
    .filter(Boolean);
  return entries.sort((a, b) => {
    if (a.type !== b.type) return a.type === 'folder' ? -1 : 1;
    return a.name.localeCompare(b.name, 'zh-CN');
  });
}

function propertySourcePath() {
  const library = loadCatalog().libraries.find(item => item.id === 'property-data');
  if (!library) throw new Error('房源数据目录未配置');
  const filePath = path.join(library.root, 'properties.json');
  if (!fs.existsSync(filePath)) throw new Error('properties.json 不存在');
  return filePath;
}

function normalizeProperty(raw) {
  return {
    id: String(raw.id || raw.objectId || raw.property_id || ''),
    community: raw.community || raw.community_name || '',
    district: raw.district || raw.area_name || '',
    totalPrice: Number(raw.totalPrice ?? raw.total_price ?? raw.price_total ?? 0),
    unitPrice: Number(raw.unitPrice ?? raw.unit_price ?? raw.price_unit ?? 0),
    layout: raw.layout || raw.house_type || '',
    area: Number(raw.area || 0),
    floor: raw.floor || raw.floor_info || '',
    floorLevel: raw.floorLevel || raw.floor_level || '',
    orientation: raw.orientation || '',
    decoration: raw.decoration || '',
    buildingAge: Number(raw.buildingAge ?? raw.building_age ?? 0),
    isSchoolDistrict: Boolean(raw.isSchoolDistrict ?? raw.is_school_district),
    schoolName: raw.schoolName || raw.school_name || '',
    parking: raw.parking || '',
    surrounding: raw.surrounding || '',
    ownerSituation: raw.ownerSituation || raw.owner_situation || '',
    priceDropSpace: Number(raw.priceDropSpace ?? raw.price_drop_space ?? 0),
    isFiveYearOnly: Boolean(raw.isFiveYearOnly ?? raw.is_five_year_only),
    highlights: raw.highlightTags || raw.highlight_tags || raw.tags || [],
    scores: {
      community: Number(raw.communityQuality || 0),
      transport: Number(raw.transportScore || 0),
      surrounding: Number(raw.surroundingScore || 0),
      priceAdvantage: Number(raw.priceAdvantage || 0),
    },
  };
}

function allProperties() {
  const parsed = readJson(propertySourcePath(), {});
  const rows = Array.isArray(parsed) ? parsed : (parsed.properties || parsed.data || []);
  return rows.map(normalizeProperty).filter(item => item.id || item.community);
}

function propertyStats(properties) {
  const prices = properties.map(item => item.totalPrice).filter(value => value > 0);
  return {
    total: properties.length,
    districts: [...new Set(properties.map(item => item.district.split('-')[0]).filter(Boolean))].sort(),
    layouts: [...new Set(properties.map(item => item.layout).filter(Boolean))].sort(),
    decorations: [...new Set(properties.map(item => item.decoration).filter(Boolean))].sort(),
    minPrice: prices.length ? Math.min(...prices) : 0,
    maxPrice: prices.length ? Math.max(...prices) : 0,
    averagePrice: prices.length ? Math.round(prices.reduce((sum, value) => sum + value, 0) / prices.length) : 0,
    schoolDistrictCount: properties.filter(item => item.isSchoolDistrict).length,
  };
}

function listKnowledgeTree() {
  const catalog = loadCatalog();
  const roots = catalog.libraries.map(library => {
    const fileChildren = buildDirectoryChildren(library, library.root);
    const virtualNode = library.kind === 'meeting-library'
      ? { relativePath: '__meeting_dashboard__', name: '会议工作台', kind: 'meeting-dashboard' }
      : library.kind === 'doc-library'
        ? { relativePath: '__doc_dashboard__', name: '文档工作台', kind: 'doc-dashboard' }
        : library.kind === 'todo-library'
          ? { relativePath: '__todo_dashboard__', name: '待办中心', kind: 'todo-dashboard' }
          : library.kind === 'task-library'
            ? { relativePath: '__task_dashboard__', name: '统一任务工作台', kind: 'task-dashboard' }
          : null;
    const children = virtualNode
      ? [{ id: encodeNodeId(library.id, virtualNode.relativePath), name: virtualNode.name, type: 'file', kind: virtualNode.kind, virtual: true }, ...fileChildren]
      : fileChildren;
    return {
      id: encodeNodeId(library.id, ''),
      libraryId: library.id,
      name: library.label,
      description: library.description,
      type: 'folder',
      kind: library.kind,
      path: library.root,
      children,
      fileCount: fileChildren.reduce((sum, item) => sum + (item.type === 'file' ? 1 : item.fileCount || 0), 0),
    };
  });
  const properties = allProperties();
  return {
    status: 'ok',
    data: {
      catalogVersion: catalog.version,
      roots,
      summary: {
        libraryCount: roots.length,
        fileCount: roots.reduce((sum, item) => sum + item.fileCount, 0),
        propertyCount: properties.length,
        skillCount: listSkillRegistry().data.summary.skillCount,
      },
    },
  };
}

function readKnowledgeFile(nodeId) {
  const { library, filePath, relativePath } = safeNodePath(nodeId);
  if (!fs.existsSync(filePath) || !fs.statSync(filePath).isFile()) throw new Error('知识库文件不存在');
  const extension = path.extname(filePath).toLowerCase();
  if (!ALLOWED_EXTENSIONS.has(extension) || !library.extensions.has(extension)) throw new Error('不支持预览该文件');
  const stats = fs.statSync(filePath);
  if (stats.size > MAX_PREVIEW_BYTES) throw new Error('文件超过 2MB，请缩小后再预览');
  const kind = fileKind(filePath);
  const content = fs.readFileSync(filePath, 'utf8').replace(/^\uFEFF/, '');
  let structured = null;
  if (extension === '.json') {
    try { structured = JSON.parse(content); } catch {}
  }
  return {
    status: 'ok',
    data: {
      id: nodeId,
      name: path.basename(filePath),
      kind,
      library: library.label,
      relativePath: relativePath.replace(/\\/g, '/'),
      size: stats.size,
      modifiedAt: stats.mtime.toISOString(),
      content,
      structured,
      propertyStats: kind === 'property-dataset' ? propertyStats(allProperties()) : null,
    },
  };
}

function listProperties(query = {}) {
  const q = String(query.q || '').trim().toLowerCase();
  const district = String(query.district || '').trim();
  const layout = String(query.layout || '').trim();
  const decoration = String(query.decoration || '').trim();
  const maxPrice = Number(query.maxPrice || 0);
  const page = Math.max(1, Number(query.page || 1) || 1);
  const pageSize = Math.max(6, Math.min(60, Number(query.pageSize || 18) || 18));
  const all = allProperties();
  const filtered = all.filter(item => {
    const haystack = `${item.id} ${item.community} ${item.district} ${item.layout} ${(item.highlights || []).join(' ')}`.toLowerCase();
    if (q && !haystack.includes(q)) return false;
    if (district && !item.district.includes(district)) return false;
    if (layout && item.layout !== layout) return false;
    if (decoration && item.decoration !== decoration) return false;
    if (maxPrice && item.totalPrice > maxPrice) return false;
    return true;
  });
  const offset = (page - 1) * pageSize;
  return {
    status: 'ok',
    data: {
      items: filtered.slice(offset, offset + pageSize),
      total: filtered.length,
      page,
      pageSize,
      pageCount: Math.max(1, Math.ceil(filtered.length / pageSize)),
      stats: propertyStats(all),
      source: propertySourcePath(),
      sourceLabel: '演示房源数据集',
    },
  };
}

function getProperty(propertyId) {
  const property = allProperties().find(item => item.id === String(propertyId));
  if (!property) throw new Error('房源不存在');
  return { status: 'ok', data: { property, source: propertySourcePath(), sourceLabel: '演示房源数据集' } };
}

function parseSkillFrontmatter(content, folderName) {
  const block = content.match(/^---\s*\r?\n([\s\S]*?)\r?\n---/);
  const frontmatter = block?.[1] || '';
  const name = frontmatter.match(/^name:\s*(.+)$/m)?.[1]?.trim() || folderName;
  const description = frontmatter.match(/^description:\s*(.+)$/m)?.[1]?.trim() || '';
  const title = content.match(/^#\s+(.+)$/m)?.[1]?.trim() || name;
  return { name, description, title };
}

function listSkillRegistry() {
  const packages = packageDefinitions().map(pkg => {
    const skillsRoot = path.join(pkg.root, 'skills');
    const skills = fs.existsSync(skillsRoot)
      ? fs.readdirSync(skillsRoot, { withFileTypes: true }).filter(entry => entry.isDirectory()).map(entry => {
        const skillFile = path.join(skillsRoot, entry.name, 'SKILL.md');
        if (!fs.existsSync(skillFile)) return null;
        const content = fs.readFileSync(skillFile, 'utf8').replace(/^\uFEFF/, '');
        const meta = parseSkillFrontmatter(content, entry.name);
        return {
          id: `${pkg.id}:${entry.name}`,
          packageId: pkg.id,
          folder: entry.name,
          name: meta.name,
          title: meta.title,
          description: meta.description,
          tags: CAPABILITY_TAGS[entry.name] || ['Skill/MCP'],
          page: PAGE_BY_SKILL[entry.name] || '',
          status: pkg.id === 'unified-source' ? 'integrated' : pkg.status,
          content,
          filePath: skillFile,
        };
      }).filter(Boolean)
      : [];
    return {
      id: pkg.id,
      label: pkg.label,
      description: pkg.description,
      status: pkg.status,
      root: pkg.root,
      skillCount: skills.length,
      skills,
    };
  });

  const properties = allProperties();
  packages.push({
    id: 'huaxiang-property-matching',
    label: '花巷房源匹配项目',
    description: '房源数据、客户样本、标签体系与多维匹配引擎。',
    status: 'data-connected',
    root: path.dirname(propertySourcePath()),
    skillCount: 1,
    skills: [{
      id: 'huaxiang-property-matching:property-matching',
      packageId: 'huaxiang-property-matching',
      folder: 'property-matching',
      name: 'property-matching',
      title: '房源智能匹配',
      description: `已接入 ${properties.length} 套演示房源、客户样本、标签和匹配引擎，可作为 Agent 的业务工具与知识数据源。`,
      tags: ['房源列表', '客户画像', '多维评分'],
      page: 'knowledge',
      status: 'integrated',
      content: '# 房源智能匹配\n\n房源数据与匹配引擎已经接入 4320 的知识库页面。\n\n- 数据源：`properties.json`\n- 客户样本：`buyers.json`\n- 标签体系：`buyer-tags.json`\n- 匹配引擎：`match-engine.js`\n',
      filePath: propertySourcePath(),
    }],
  });

  const allSkills = packages.flatMap(item => item.skills);
  const uniqueNames = new Set(allSkills.map(item => item.name));
  return {
    status: 'ok',
    data: {
      packages,
      summary: {
        packageCount: packages.length,
        skillCount: allSkills.length,
        uniqueCapabilityCount: uniqueNames.size,
        integratedCount: allSkills.filter(item => item.status === 'integrated').length,
      },
    },
  };
}

function getSkillDetail(skillId) {
  const registry = listSkillRegistry().data;
  const skill = registry.packages.flatMap(item => item.skills.map(entry => ({ ...entry, package: item.label, packageRoot: item.root })))
    .find(item => item.id === skillId);
  if (!skill) throw new Error('技能不存在');
  return { status: 'ok', data: skill };
}

module.exports = {
    PROJECT_ROOT,
    PACKAGE_ROOT,
  KNOWLEDGE_BASE_DIR,
  listKnowledgeTree,
  readKnowledgeFile,
  listProperties,
  getProperty,
  listSkillRegistry,
  getSkillDetail,
};