'use strict';

// 共享状态装配：config / session / 手动店铺 / workspace 路径守卫 / 日志。
// 由 server.js 在启动时调用一次 createContext()，得到的 ctx 贯穿所有服务与路由。
// 语义与拆分前一致：config 为同一个可变对象；getWorkspaceRoot() 每次重读 config.rootDir。

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

const ROOT_DIR = path.resolve(__dirname, '..');
const PUBLIC_DIR = path.join(ROOT_DIR, 'public');
const CONFIG_PATH = path.join(ROOT_DIR, 'config.json');
const CONFIG_EXAMPLE_PATH = path.join(ROOT_DIR, 'config.example.json');
const SESSION_PATH = path.join(ROOT_DIR, 'session.json');
const MANUAL_SHOPS_PATH = path.join(ROOT_DIR, 'manual-shops.json');

const CONFIG_DEFAULTS = {
  port: 5177,
  apiKey: '',
  apiBase: 'https://api.lk888.ai',
  model: 'gpt-image-2',
  maxConcurrentJobs: 4,
  pageSize: 50,
  delayMs: 300,
  requestTimeoutMs: 20000,
  chatModel: '',
  chatApiBase: '',
  chatApiKey: '',
  accessToken: '',
  // HTTP 访问日志：true 时在控制台打印每个请求（5xx 与超过 1s 的慢请求始终打印）
  httpLog: false,
  // 钉钉 AI 表格（在线主档案/共享层）：同步完成后自动推送，其他机器可拉取
  // 非敏感项给组织级默认值（appKey/baseId/三张表名/operatorId），新机器只需填 AppSecret；
  // appSecret 按规矩不进源码（gitignored config.json 各机自存）。
  // 三张表按维度拆分（每张表内粒度唯一，AI 问数/人工聚合不会跨维度算重）；
  // 旧单表 sheetName 已废弃不读，读取处对缺省键兜底（老 config.json 零迁移）。
  aitable: {
    enabled: false,
    appKey: 'ding5vlpq3yeu7h6c6kj',
    appSecret: '',
    baseId: '7QG4Yx2JpLkaBl7EIpXNx0aGJ9dEq3XD',
    sheetDetail: '门店明细',
    sheetChain: '连锁汇总',
    sheetCompany: '公司汇总',
    operatorId: 'zkWXDRXbxDlUiPgRPI3XjpwiEiE',
  },
  // 经营数据每日自动同步（商家客户端在线时自动补昨日数据），默认关闭
  autoSync: { enabled: false, time: '06:00' },
};

function writeConfigFile(cfg) {
  const temp = CONFIG_PATH + '.tmp';
  fs.writeFileSync(temp, JSON.stringify(cfg, null, 2), 'utf8');
  fs.renameSync(temp, CONFIG_PATH);
}

// 缺失/损坏时自动用模板（或内置默认）在本机生成新的 config.json —— 分发包开箱即用
function loadConfig() {
  try {
    return { ...CONFIG_DEFAULTS, ...JSON.parse(fs.readFileSync(CONFIG_PATH, 'utf8')) };
  } catch (e) {
    if (e.code !== 'ENOENT') {
      console.warn(`config.json 解析失败（${e.message || e}），已改用默认配置；保存设置后会重建该文件。`);
    }
    let seeded = {};
    try { seeded = JSON.parse(fs.readFileSync(CONFIG_EXAMPLE_PATH, 'utf8')); } catch { /* 无模板则用内置默认 */ }
    const cfg = { ...CONFIG_DEFAULTS, ...seeded };
    try {
      writeConfigFile(cfg);
      console.log('已生成本机默认 config.json —— 请在「系统设置」中填写你自己的 API Key。');
    } catch { /* 只读目录等场景忽略 */ }
    return cfg;
  }
}

const MODELS = [
  { id: 'gpt-image-2', label: 'GPT Image 2（默认）' },
  { id: 'gpt-image-2-guan', label: 'GPT Image 2 官转' },
  { id: 'doubao-seedream-5-0-pro-260628', label: '豆包 Seedream 5.0 Pro' },
  { id: 'doubao-seedream-5-0-260128', label: '即梦 5.0（Seedream 5.0）' },
  { id: 'doubao-seedream-4-5-251128', label: '即梦 4.5（Seedream 4.5）' },
  { id: 'wan2.6-image', label: '通义万相 wan2.6-image' },
];
const MODEL_IDS = new Set(MODELS.map((m) => m.id));

// These seedream variants don't support the '1K' tier the UI's size dropdown offers by
// default (doubao-seedream-4-5-251128: 2K/4K only; doubao-seedream-5-0-260128: 2K/3K only) -
// map it up to '2K' rather than sending an invalid enum value.
const NO_1K_SUPPORT = new Set(['doubao-seedream-4-5-251128', 'doubao-seedream-5-0-260128']);

// ---------- workspace 路径守卫 ----------

function createWorkspaceService(config) {
  const WORKSPACE_ROOT = path.join(path.dirname(ROOT_DIR), 'workspace');

  function getWorkspaceRoot() {
    const configuredRoot = String(config.rootDir || WORKSPACE_ROOT).trim() || WORKSPACE_ROOT;
    return path.resolve(configuredRoot);
  }

  function isWorkspaceRoot(candidate) {
    try {
      return !!candidate && path.resolve(String(candidate)) === getWorkspaceRoot();
    } catch {
      return false;
    }
  }

  function isWorkspacePath(candidate) {
    try {
      const resolved = path.resolve(String(candidate));
      const root = getWorkspaceRoot();
      return resolved === root || resolved.startsWith(root + path.sep);
    } catch {
      return false;
    }
  }

  function safeShopDir(root, folderName) {
    if (!isWorkspaceRoot(root) || typeof folderName !== 'string' ||
        !folderName || folderName === '.' || folderName === '..' ||
        folderName.includes('/') || folderName.includes('\\')) return null;
    const rootDir = path.resolve(root);
    const shopDir = path.resolve(rootDir, folderName);
    return shopDir.startsWith(rootDir + path.sep) ? shopDir : null;
  }

  return { WORKSPACE_ROOT, getWorkspaceRoot, isWorkspaceRoot, isWorkspacePath, safeShopDir };
}

// ---------- 采集 Cookie 会话 ----------

function extractCookieValue(cookie, name) {
  const match = String(cookie || '').match(new RegExp(`(?:^|;\\s*)${name}=([^;]*)`));
  if (!match) return '';
  try { return decodeURIComponent(match[1]); } catch { return match[1]; }
}

function createSessionService() {
  const session = { cookie: '' };

  function loadSession() {
    try {
      const saved = JSON.parse(fs.readFileSync(SESSION_PATH, 'utf8'));
      session.cookie = String(saved.cookie || '');
    } catch { /* no saved session */ }
  }

  function saveSession() {
    fs.writeFileSync(SESSION_PATH, JSON.stringify(session, null, 2), 'utf8');
  }

  function getKsid() { return extractCookieValue(session.cookie, 'ksid'); }

  loadSession();
  return {
    get cookie() { return session.cookie; },
    set cookie(v) { session.cookie = v; },
    saveSession,
    getKsid,
  };
}

// ---------- 手动店铺清单 ----------

function createShopsService() {
  let shopList = [];

  function loadManualShops() {
    try {
      const data = JSON.parse(fs.readFileSync(MANUAL_SHOPS_PATH, 'utf8'));
      if (data.version !== 1 || !Array.isArray(data.shops)) throw new Error('清单格式无效');
      const shopsById = new Map();
      for (const shop of data.shops) {
        if (!shop || !Number.isInteger(shop.shopId) || shop.shopId <= 0) continue;
        shopsById.set(shop.shopId, { shopId: shop.shopId, shopName: String(shop.shopName || shop.shopId), source: 'manual' });
      }
      shopList = Array.from(shopsById.values());
    } catch (e) {
      if (e.code !== 'ENOENT') console.warn(`读取手动店铺清单失败: ${e.message || e}`);
    }
  }

  function saveManualShops(shops) {
    const temp = `${MANUAL_SHOPS_PATH}.${process.pid}.tmp`;
    fs.writeFileSync(temp, JSON.stringify({ version: 1, shops }, null, 2), 'utf8');
    fs.renameSync(temp, MANUAL_SHOPS_PATH);
  }

  function mergeShops(newOnes) {
    const shopsById = new Map(shopList.map((shop) => [shop.shopId, shop]));
    for (const shop of newOnes) shopsById.set(shop.shopId, shop);
    return Array.from(shopsById.values());
  }

  loadManualShops();
  return {
    getList: () => shopList,
    setList: (v) => { shopList = v; },
    mergeShops,
    saveManualShops,
  };
}

// ---------- 日志（系统日志 + 统一序号；采集任务日志由 crawl 服务持有，这里负责合并） ----------

function createLogsService() {
  const systemLogs = [];
  let logSeq = 0;

  function detectLogLevel(message) {
    if (/失败|错误|异常|过期|error|鉴权/i.test(message)) return 'error';
    if (/停止|跳过|警告|warn/i.test(message)) return 'warn';
    if (/完成|成功|已保存|已启动|done/i.test(message)) return 'success';
    return 'info';
  }

  function createLogEntry(message, source = 'task', level = 'info') {
    const now = new Date();
    return {
      seq: ++logSeq,
      id: `${source}-${logSeq}`,
      source,
      level,
      time: now.toTimeString().slice(0, 8),
      timestamp: now.getTime(),
      message: String(message),
    };
  }

  function pushSystemLog(msg, level = 'info') {
    systemLogs.push(createLogEntry(msg, 'system', level));
    if (systemLogs.length > 500) systemLogs.shift();
  }

  function mergeLogs(crawlLog) {
    return [...crawlLog, ...systemLogs]
      .sort((a, b) => b.seq - a.seq)
      .slice(0, 500);
  }

  function clearAll(crawlLog) {
    if (crawlLog) crawlLog.length = 0;
    systemLogs.length = 0;
  }

  return { detectLogLevel, createLogEntry, pushSystemLog, mergeLogs, clearAll };
}

function createContext() {
  const config = loadConfig();
  // 局域网访问口令：环境变量可临时覆盖（不落盘），便于临时开启/测试
  if (process.env.ACCESS_TOKEN) config.accessToken = process.env.ACCESS_TOKEN;
  const workspace = createWorkspaceService(config);
  try {
    fs.mkdirSync(workspace.getWorkspaceRoot(), { recursive: true });
  } catch (e) {
    // 历史配置的 rootDir 在本机不可创建（权限/目录被移动）时不要崩，允许进设置页修改
    console.warn(`输出根目录不可用：${workspace.getWorkspaceRoot()}（${e.code || e.message}）。请到「系统设置」修改输出根目录。`);
  }
  const session = createSessionService();
  const shops = createShopsService();
  const logs = createLogsService();

  function saveConfig() {
    writeConfigFile(config);
  }

  return {
    ROOT_DIR,
    PUBLIC_DIR,
    config,
    saveConfig,
    models: { MODELS, MODEL_IDS, NO_1K_SUPPORT },
    workspace,
    session,
    shops,
    logs,
  };
}

// 智能问数的对话模型：未在设置中选择时使用的兜底模型，以及「生图 Key 复用」推导。
// 不放入 CONFIG_DEFAULTS —— 避免落盘到 config.json（保持拆分前的持久化内容）。
const DEFAULT_CHAT_MODEL = 'deepseek-v4.1-flash';

function makeChatCfg(ctx) {
  return {
    chatApiBase: ctx.config.chatApiBase || ctx.config.apiBase,
    chatApiKey: ctx.config.chatApiKey || ctx.config.apiKey,
    chatModel: ctx.config.chatModel || DEFAULT_CHAT_MODEL,
  };
}

module.exports = {
  createContext,
  CONFIG_DEFAULTS,
  MODELS,
  MODEL_IDS,
  NO_1K_SUPPORT,
  DEFAULT_CHAT_MODEL,
  makeChatCfg,
};