/**
 * server.js - AI 接单系统主服务
 * 支持 Docker 部署、垃圾过滤、环境变量配置
 */
import http from 'http';
import fs from 'fs';
import path from 'path';
import { fileURLToPath } from 'url';
import { CONFIG, validateConfig } from './config.js';
import {
  createOrder, getActiveOrders, getArchivedOrders, getAllOrders, findOrder, getOrder,
  updateStatus, addSubTask, updateSubStatus, updateProgress, setExpectedDays,
  deliverOrder, archiveOrder, addComment, getRecentOrders, getPendingCount, deleteOrder, flagOrder
} from './order-manager.js';
import { analyzeRequirement, generateConfirmation } from './ai-intake.js';
import { filterOrder, getRateStatus } from './spam-filter.js';

const __dirname = path.dirname(fileURLToPath(import.meta.url));

// 启动检查
const configWarnings = validateConfig();
if (configWarnings.length) configWarnings.forEach(w => console.log(w));

// 路由表
const routes = {
  '/'              : serveStatic('submit.html', 'text/html'),
  '/submit'        : serveStatic('submit.html', 'text/html'),
  '/admin'         : serveStatic('admin.html', 'text/html'),
  '/track'         : serveStatic('track.html', 'text/html'),
  '/style.css'     : serveStatic('style.css', 'text/css'),
  '/api/orders'       : apiOrders,
  '/api/orders/active': apiActiveOrders,
  '/api/orders/archived': apiArchivedOrders,
  '/api/orders/search': apiSearchOrders,
  '/api/orders/pending': apiPendingCount,
  '/api/orders/recent': apiRecentOrders,
  '/api/orders/analyze': apiAnalyze,
  '/api/health'       : apiHealth,
};

function serveStatic(file, mime) {
  return (req, res) => {
    const p = path.join(__dirname, 'public', file);
    try {
      let data = fs.readFileSync(p, 'utf-8');
      // 注入站点名称
      data = data.replace(/__SITE_NAME__/g, CONFIG.siteName);
      data = data.replace(/__ADMIN_TOKEN__/g, CONFIG.adminToken);
      res.writeHead(200, { 'Content-Type': mime });
      res.end(data);
    } catch {
      res.writeHead(404);
      res.end('Not found');
    }
  };
}

function json(res, data, code = 200) {
  res.writeHead(code, { 'Content-Type': 'application/json', 'Access-Control-Allow-Origin': '*' });
  res.end(JSON.stringify(data));
}

function readBody(req) {
  return new Promise(resolve => {
    let d = '';
    req.on('data', c => d += c);
    req.on('end', () => { try { resolve(JSON.parse(d)); } catch { resolve({}); } });
  });
}

function parseUrl(req) {
  return new URL(req.url, `http://localhost:${CONFIG.port}`);
}

function getClientIp(req) {
  return req.headers['x-forwarded-for']?.split(',')[0]?.trim() || req.socket?.remoteAddress || '0.0.0.0';
}

// --- API Handlers ---

async function apiOrders(req, res) {
  const url = parseUrl(req);
  const parts = url.pathname.split('/');
  const id = parts.length >= 4 ? parts[3] : null;
  const ip = getClientIp(req);
  // Special sub-paths - redirect to specific handlers
  if (id === 'active') return apiActiveOrders(req, res);
  if (id === 'archived') return apiArchivedOrders(req, res);
  if (id === 'search') return apiSearchOrders(req, res);
  if (id === 'pending') return apiPendingCount(req, res);
  if (id === 'recent') return apiRecentOrders(req, res);
  if (id === 'analyze') return apiAnalyze(req, res);

  // GET
  if (req.method === 'GET') {
    if (id) {
      const order = getOrder(id);
      if (!order) return json(res, { error: '订单不存在' }, 404);
      return json(res, order);
    }
    return json(res, getAllOrders());
  }

  // POST — 创建订单（含垃圾过滤）
  if (req.method === 'POST') {
    const body = await readBody(req);
    if (!body.requirements || !body.contact) {
      return json(res, { error: '需求和联系方式不能为空' }, 400);
    }

    // 垃圾过滤三道关
    const security = filterOrder(body, ip);
    if (!security.allowed) {
      return json(res, {
        error: '提交被拒绝',
        issues: security.issues,
        flagged: true,
      }, 429);
    }

    const order = createOrder({
      name: body.name,
      contact: body.contact,
      contactType: body.contactType || '微信',
      requirements: body.requirements,
      budget: body.budget || '',
      expectedDays: parseInt(body.expectedDays) || 0,
      source: body.source || 'web',
    });

    // 如果被标记为可疑，自动标记
    if (security.flagged) {
      flagOrder(order.id, true, security.flagReasons?.join('; ') || '系统自动标记');
      addComment(order.id, {
        author: '系统', content: `⚠️ 此订单被自动标记为可疑: ${security.flagReasons?.join('、') || '内容异常'}。请审核。`, side: 'dev'
      });
    }

    // AI 确认（异步）
    try {
      const msg = await generateConfirmation(order);
      addComment(order.id, { author: '系统', content: msg, side: 'dev' });
    } catch {}

    return json(res, {
      success: true,
      order,
      flagged: security.flagged,
      flagReasons: security.flagged ? security.flagReasons : undefined,
    }, 201);
  }

  // PUT
  if (req.method === 'PUT') {
    const body = await readBody(req);
    let result;
    if (body.action === 'status') result = updateStatus(id, body.status);
    else if (body.action === 'subtask') result = addSubTask(id, body);
    else if (body.action === 'sub-status') result = updateSubStatus(id, body.subId, body.status);
    else if (body.action === 'comment') result = addComment(id, body);
    else if (body.action === 'flag') result = flagOrder(id, body.flagged, body.reason);
    else if (body.action === 'progress') result = updateProgress(id, body.progress, body.note);
    else if (body.action === 'set-expected') result = setExpectedDays(id, body.days);
    else if (body.action === 'deliver') result = deliverOrder(id);
    else if (body.action === 'archive') result = archiveOrder(id);
    if (!result) return json(res, { error: '操作失败' }, 400);
    return json(res, { success: true, data: result });
  }

  // DELETE
  if (req.method === 'DELETE') {
    const ok = deleteOrder(id);
    return json(res, { success: ok });
  }
}

async function apiSearchOrders(req, res) {
  const q = parseUrl(req).searchParams.get('q') || '';
  json(res, findOrder(q));
}

function apiPendingCount(req, res) {
  json(res, { count: getPendingCount() });
}

function apiActiveOrders(req, res) {
  json(res, getActiveOrders());
}

function apiArchivedOrders(req, res) {
  json(res, getArchivedOrders());
}

function apiRecentOrders(req, res) {
  json(res, getRecentOrders(120));
}

async function apiAnalyze(req, res) {
  const body = await readBody(req);
  if (!body.text) return json(res, { error: '缺少需求文本' }, 400);
  try {
    const analysis = await analyzeRequirement(body.text);
    json(res, analysis || { error: '分析失败' });
  } catch (e) {
    json(res, { error: e.message }, 500);
  }
}

function apiHealth(req, res) {
  json(res, {
    status: 'ok',
    site: CONFIG.siteName,
    version: '1.0.0',
    aiEnabled: !!CONFIG.deepseekKey && CONFIG.deepseekKey !== 'your-api-key-here',
    docker: !!process.env.DOCKER,
  });
}

// Server
const server = http.createServer((req, res) => {
  const pathname = parseUrl(req).pathname;
  if (pathname.startsWith('/api/orders')) return apiOrders(req, res);
  const handler = routes[pathname];
  if (handler) handler(req, res);
  else { res.writeHead(404); res.end('Not found'); }
});

server.listen(CONFIG.port, '0.0.0.0', () => {
  console.log(`🧰 zhiqiu-order-system v1.0`);
  console.log(`   📋 客户提交: http://0.0.0.0:${CONFIG.port}/submit`);
  console.log(`   🔧 管理面板: http://0.0.0.0:${CONFIG.port}/admin`);
  console.log(`   🔍 订单追踪: http://0.0.0.0:${CONFIG.port}/track`);
  console.log(`   🤖 AI 辅助: ${CONFIG.deepseekKey && CONFIG.deepseekKey !== 'your-api-key-here' ? '已启用' : '未配置'}`);
});