import * as puppeteer from 'puppeteer';
import { Logger } from '@nestjs/common';
import { ChdtpResult } from './chdtp_target';

// 模拟人类鼠标移动
async function simulateHumanMouseMovement(page: puppeteer.Page) {
  const viewport = page.viewport();
  if (!viewport) return;

  const movements = 5 + Math.floor(Math.random() * 5); // 5-10次随机移动

  for (let i = 0; i < movements; i++) {
    const x = Math.floor(Math.random() * viewport.width);
    const y = Math.floor(Math.random() * viewport.height);
    
    await page.mouse.move(x, y, {
      steps: 10 + Math.floor(Math.random() * 20) // 10-30步，使移动更平滑
    });
    
    // 随机停顿 100-500ms
    await new Promise(r => setTimeout(r, 100 + Math.random() * 400));
  }
}

// 模拟人类滚动
async function simulateHumanScrolling(page: puppeteer.Page) {
  const scrollCount = 3 + Math.floor(Math.random() * 5); // 3-7次滚动

  for (let i = 0; i < scrollCount; i++) {
    const scrollDistance = 100 + Math.floor(Math.random() * 400); // 100-500px
    
    await page.evaluate((distance) => {
      window.scrollBy({
        top: distance,
        behavior: 'smooth'
      });
    }, scrollDistance);

    // 随机停顿 500-1500ms
    await new Promise(r => setTimeout(r, 500 + Math.random() * 1000));
  }

  // 滚动回顶部
  await page.evaluate(() => {
    window.scrollTo({ top: 0, behavior: 'smooth' });
  });
  await new Promise(r => setTimeout(r, 1000));
}

export const SzecpCrawler = {
  name: '华润守正采购交易平台',
  url: 'https://www.szecp.com.cn/first_zbgg/index.html',
  baseUrl: 'https://www.szecp.com.cn/',

  async crawl(browser: puppeteer.Browser): Promise<ChdtpResult[]> {
    const logger = new Logger('SzecpCrawler');
    const page = await browser.newPage();

    const username = process.env.PROXY_USERNAME;
    const password = process.env.PROXY_PASSWORD;
    if (username && password) {
      await page.authenticate({ username, password });
    }

    await page.evaluateOnNewDocument(() => {
      Object.defineProperty(navigator, 'webdriver', { get: () => false });
      Object.defineProperty(navigator, 'language', { get: () => 'zh-CN' });
      Object.defineProperty(navigator, 'plugins', { get: () => [1, 2, 3, 4, 5] });
    });

    await page.setUserAgent('Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36');
    await page.setViewport({ width: 1920, height: 1080 });

    const allResults: ChdtpResult[] = [];
    let currentPage = 1;
    const maxPages = 5;

    try {
      logger.log(`Navigating to ${this.url}...`);
      await page.goto(this.url, { waitUntil: 'networkidle2', timeout: 60000 });

      // 模拟人类行为
      logger.log('Simulating human mouse movements...');
      await simulateHumanMouseMovement(page);
      
      logger.log('Simulating human scrolling...');
      await simulateHumanScrolling(page);

      // Wait for search button to be available and click it
      logger.log('Clicking search button...');
      await page.waitForSelector('.szb-zbcgSearch-key-v1', { timeout: 60000 });
      await page.click('.szb-zbcgSearch-key-v1');
      await new Promise(r => setTimeout(r, 3000)); // Wait for results to load

      while (currentPage <= maxPages) {
        logger.log(`Processing page ${currentPage}...`);

        // Wait for content to load
        await page.waitForFunction(() => {
          return document.querySelectorAll('.szb-zbcgTable-other').length > 0;
        }, { timeout: 60000 }).catch(() => logger.warn('Content not found. Site might be slow.'));

        const pageResults = await page.evaluate((baseUrl) => {
          // Extract from table rows
          const items = Array.from(document.querySelectorAll('.szb-zbcgTable-other'));
          return items.map(item => {
            const divs = item.querySelectorAll('div');
            if (divs.length >= 5) {
              const titleLink = divs[1].querySelector('a');
              const title = titleLink?.textContent?.trim() || '';
              const dateStr = divs[4].textContent?.trim() || '';
              const href = titleLink?.getAttribute('href') || '';

              if (title.length < 5) return null; // Filter noise

              // Construct full URL if href is relative
              const url = href.startsWith('http') ? href : `${baseUrl}${href}`;

              return {
                title,
                dateStr,
                url
              };
            }
            return null;
          }).filter(i => i !== null);
        }, this.baseUrl);

        if (pageResults.length === 0) {
          logger.warn(`No results found on page ${currentPage}. Extraction failed.`);
          break;
        }

        allResults.push(...pageResults.map(r => ({
          title: r!.title,
          publishDate: new Date(r!.dateStr),
          url: r!.url
        })));

        logger.log(`Extracted ${pageResults.length} items.`);

        // Pagination: look for next page link
        const nextButton = await page.$('.pagination li a[page="+"]');
        if (!nextButton) break;

        await nextButton.click();
        await new Promise(r => setTimeout(r, 3000));
        
        // 模拟人类行为
        logger.log('Simulating human mouse movements...');
        await simulateHumanMouseMovement(page);
        
        logger.log('Simulating human scrolling...');
        await simulateHumanScrolling(page);
        
        currentPage++;
      }

      return allResults;

    } catch (error) {
      logger.error(`Crawl failed: ${error.message}`);
      return allResults;
    } finally {
      if (page) await page.close();
    }
  },

  extract() { return []; }
};