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

/**
 * Xiaozhu Minsu Scraper - Client interface scraper
 * URL: https://minsu.xiaozhu.com/
 *
 * Critères:
 * - Xujiahui District (徐汇区) - près de Jiaotong University
 * - 24 déc 2025 → 22 jan 2026 (29 jours)
 * - Budget: 3000-5000 RMB/mois (idéal 3000-4000)
 * - Must-have: Cuisine + frigo
 * - Nice: Machine à laver, proche métro
 */

const CONFIG = {
  // Dates
  checkIn: '2025-12-24',
  checkOut: '2026-01-22',

  // Location
  city: '上海',
  district: '徐汇区',
  keyword: '交通大学', // Near Jiaotong University

  // Budget (RMB/month)
  budgetMin: 0,
  budgetMax: 5000,
  budgetIdeal: 4000,

  // Calculate daily budget (29 days)
  days: 29,
  get dailyBudgetMax() {
    return Math.ceil(this.budgetMax / 30 * this.days);
  },
  get dailyBudgetIdeal() {
    return Math.ceil(this.budgetIdeal / 30 * this.days);
  },

  // Equipment
  required: ['厨房', '冰箱'], // Kitchen, fridge
  bonus: ['洗衣机', '地铁'], // Washing machine, metro

  // Output
  outputFile: './xiaozhu_minsu_results.json',
  outputMarkdown: './xiaozhu_minsu_results.md',
  topN: 20
};

console.log('💰 Budget calculation:');
console.log(`   Monthly budget: ${CONFIG.budgetIdeal}-${CONFIG.budgetMax} RMB`);
console.log(`   Stay duration: ${CONFIG.days} days`);
console.log(`   Daily budget: ${CONFIG.dailyBudgetIdeal}-${CONFIG.dailyBudgetMax} RMB total`);

async function loadCookies() {
  try {
    const cookies = fs.readFileSync('./xiaozhu_cookies.json', 'utf8');
    return JSON.parse(cookies);
  } catch (err) {
    console.log('⚠️  No cookies found!');
    console.log('\n📋 SETUP REQUIRED:');
    console.log('1. Go to https://minsu.xiaozhu.com/ in Firefox');
    console.log('2. Login if needed');
    console.log('3. Extract cookies using firefox_cookie_converter.js');
    console.log('4. Run this script again\n');
    return null;
  }
}

async function scrapMinsuXiaozhu() {
  const cookies = await loadCookies();

  const browser = await puppeteer.launch({
    headless: "new",
    defaultViewport: { width: 1920, height: 1080 },
    args: ['--no-sandbox', '--disable-setuid-sandbox']
  });

  const page = await browser.newPage();

  // Set user agent
  await page.setUserAgent('Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36');

  // Load cookies if available
  if (cookies && cookies.length > 0) {
    await page.setCookie(...cookies);
    console.log(`🍪 Loaded ${cookies.length} cookies`);
  }

  try {
    // Try different search URL patterns
    const searchUrls = [
      `https://minsu.xiaozhu.com/search-shanghai-${CONFIG.district}/`,
      `https://minsu.xiaozhu.com/shanghai/${CONFIG.district}/`,
      `https://minsu.xiaozhu.com/search?city=shanghai&district=${CONFIG.district}`,
      'https://minsu.xiaozhu.com/shanghai/',
      'https://minsu.xiaozhu.com/'
    ];

    let pageLoaded = false;
    let currentUrl = '';

    for (const url of searchUrls) {
      console.log(`\n🔍 Trying: ${url}`);

      try {
        await page.goto(url, {
          waitUntil: 'networkidle2',
          timeout: 20000
        });

        currentUrl = page.url();
        console.log(`✅ Loaded: ${currentUrl}`);

        // Wait for content
        await new Promise(resolve => setTimeout(resolve, 3000));

        // Check if we found listings
        const hasListings = await page.evaluate(() => {
          const possibleSelectors = [
            '.room-list', '.house-list', '.list-item',
            '[class*="room"]', '[class*="house"]', '[class*="result"]'
          ];

          for (const sel of possibleSelectors) {
            const elements = document.querySelectorAll(sel);
            if (elements.length > 2) return true;
          }
          return false;
        });

        if (hasListings || currentUrl.includes('search') || currentUrl.includes('shanghai')) {
          pageLoaded = true;
          break;
        }

      } catch (err) {
        console.log(`   ❌ Failed: ${err.message}`);
      }
    }

    if (!pageLoaded) {
      console.log('\n❌ Could not load search page. Trying homepage navigation...');
      await page.goto('https://minsu.xiaozhu.com/', { waitUntil: 'networkidle2' });
    }

    // Take screenshot
    await page.screenshot({ path: './xiaozhu_minsu_page.png', fullPage: true });
    console.log('📸 Screenshot saved: xiaozhu_minsu_page.png');

    // Try to find and use search functionality
    console.log('\n🔍 Looking for search input...');

    const searchInputSelectors = [
      'input[placeholder*="目的地"]',
      'input[placeholder*="搜索"]',
      'input[placeholder*="城市"]',
      'input.search-input',
      '#search-input',
      'input[type="text"]'
    ];

    let searchFound = false;
    for (const selector of searchInputSelectors) {
      try {
        const input = await page.$(selector);
        if (input) {
          console.log(`✅ Found search input: ${selector}`);

          // Type search query
          await input.click();
          await page.keyboard.type(`${CONFIG.city} ${CONFIG.district}`, { delay: 100 });
          await new Promise(resolve => setTimeout(resolve, 1500));

          // Try to submit
          await page.keyboard.press('Enter');
          await new Promise(resolve => setTimeout(resolve, 3000));

          searchFound = true;
          break;
        }
      } catch (e) {}
    }

    if (!searchFound) {
      console.log('⚠️  No search input found, will extract from current page');
    }

    // Extract listings
    console.log('\n📊 Extracting listings...');

    const listings = await page.evaluate((config) => {
      const results = [];

      // Possible selectors for listing items
      const containerSelectors = [
        '.pho_item', '.room_box', '.house-item', '.result-item',
        '[class*="room-item"]', '[class*="house-item"]',
        '[class*="card"]'
      ];

      let listingElements = [];
      for (const selector of containerSelectors) {
        const elements = document.querySelectorAll(selector);
        if (elements.length > 2 && elements.length < 200) {
          listingElements = Array.from(elements);
          console.log(`Found ${elements.length} items with selector: ${selector}`);
          break;
        }
      }

      listingElements.forEach((item, index) => {
        if (index >= 50) return; // Limit to first 50

        const listing = {
          index: index + 1,
          raw: item.textContent.substring(0, 300)
        };

        // Extract title
        const titleEl = item.querySelector('h2, h3, h4, [class*="title"], [class*="name"]');
        if (titleEl) {
          listing.title = titleEl.textContent.trim();
        }

        // Extract price
        const priceSelectors = [
          '[class*="price"]', '[class*="money"]',
          'span:contains("¥")', 'span:contains("元")'
        ];

        for (const priceSel of priceSelectors) {
          try {
            const priceEl = item.querySelector(priceSel);
            if (priceEl) {
              const priceText = priceEl.textContent;
              const priceMatch = priceText.match(/(\d+)/);
              if (priceMatch) {
                listing.priceDaily = parseInt(priceMatch[1]);
                listing.priceText = priceText;
                break;
              }
            }
          } catch (e) {}
        }

        // Extract location
        const locationEl = item.querySelector('[class*="location"], [class*="address"], [class*="area"]');
        if (locationEl) {
          listing.location = locationEl.textContent.trim();
        }

        // Extract URL
        const linkEl = item.querySelector('a');
        if (linkEl) {
          listing.url = linkEl.href;
        }

        // Extract image
        const imgEl = item.querySelector('img');
        if (imgEl) {
          listing.image = imgEl.src;
        }

        // Check for equipment keywords
        const fullText = item.textContent;
        listing.hasKitchen = fullText.includes('厨房') || fullText.includes('kitchen');
        listing.hasFridge = fullText.includes('冰箱') || fullText.includes('fridge');
        listing.hasWashingMachine = fullText.includes('洗衣机') || fullText.includes('washing');
        listing.hasMetro = fullText.includes('地铁') || fullText.includes('metro');

        if (listing.title || listing.priceDaily) {
          results.push(listing);
        }
      });

      return results;
    }, CONFIG);

    console.log(`✅ Extracted ${listings.length} listings`);

    if (listings.length === 0) {
      console.log('\n❌ No listings found. Saving page HTML for manual inspection...');
      const html = await page.content();
      fs.writeFileSync('./xiaozhu_minsu_page.html', html);
      console.log('💾 HTML saved to: xiaozhu_minsu_page.html');
    } else {
      // Calculate total price for stay duration
      const filtered = listings
        .filter(l => l.priceDaily > 0)
        .map(l => {
          l.priceTotal = l.priceDaily * CONFIG.days;
          l.priceMonthly = Math.ceil(l.priceDaily * 30);

          // Score calculation
          let score = 0;

          // Price score
          if (l.priceTotal <= CONFIG.dailyBudgetIdeal) {
            score += (CONFIG.dailyBudgetIdeal - l.priceTotal) / 100;
          } else if (l.priceTotal <= CONFIG.dailyBudgetMax) {
            score -= (l.priceTotal - CONFIG.dailyBudgetIdeal) / 50;
          } else {
            score -= 100; // Over budget penalty
          }

          // Equipment bonuses
          if (l.hasKitchen) score += 20;
          if (l.hasFridge) score += 15;
          if (l.hasWashingMachine) score += 10;
          if (l.hasMetro) score += 15;

          // Location bonus (if contains keyword)
          if (l.location && l.location.includes(CONFIG.district)) score += 20;
          if (l.title && l.title.includes(CONFIG.keyword)) score += 10;

          l.score = Math.round(score * 10) / 10;
          return l;
        })
        .filter(l => l.hasKitchen && l.hasFridge) // Must-have requirements
        .filter(l => l.priceTotal <= CONFIG.dailyBudgetMax) // Budget filter
        .sort((a, b) => b.score - a.score)
        .slice(0, CONFIG.topN);

      console.log(`\n✅ Filtered to ${filtered.length} suitable options`);

      // Save results
      fs.writeFileSync(CONFIG.outputFile, JSON.stringify(filtered, null, 2));
      console.log(`💾 Results saved to: ${CONFIG.outputFile}`);

      // Generate markdown
      const markdown = generateMarkdown(filtered);
      fs.writeFileSync(CONFIG.outputMarkdown, markdown);
      console.log(`📝 Markdown saved to: ${CONFIG.outputMarkdown}`);

      // Print top 5
      console.log('\n🏆 TOP 5 OPTIONS:\n');
      filtered.slice(0, 5).forEach((l, i) => {
        console.log(`${i + 1}. ${l.title || 'No title'}`);
        console.log(`   💰 ${l.priceDaily} RMB/day × ${CONFIG.days} days = ${l.priceTotal} RMB total (~${l.priceMonthly} RMB/month)`);
        if (l.location) console.log(`   📍 ${l.location}`);
        console.log(`   ✓ Kitchen: ${l.hasKitchen ? '✓' : '✗'} | Fridge: ${l.hasFridge ? '✓' : '✗'} | Washer: ${l.hasWashingMachine ? '✓' : '✗'} | Metro: ${l.hasMetro ? '✓' : '✗'}`);
        console.log(`   ⭐ Score: ${l.score}`);
        if (l.url) console.log(`   🔗 ${l.url}`);
        console.log('');
      });
    }

    // Save final screenshot
    await page.screenshot({ path: './xiaozhu_minsu_final.png', fullPage: true });
    console.log('📸 Final screenshot: xiaozhu_minsu_final.png');

  } catch (err) {
    console.error('❌ Error:', err.message);
    console.error(err.stack);
  } finally {
    await browser.close();
  }
}

function generateMarkdown(listings) {
  let md = '# Xiaozhu Minsu Search Results - Xujiahui District\n\n';
  md += `**Search Date:** ${new Date().toLocaleDateString()}\n`;
  md += `**Check-in:** ${CONFIG.checkIn}\n`;
  md += `**Check-out:** ${CONFIG.checkOut}\n`;
  md += `**Duration:** ${CONFIG.days} days\n`;
  md += `**Daily Budget:** ${CONFIG.dailyBudgetIdeal}-${CONFIG.dailyBudgetMax} RMB total\n`;
  md += `**Monthly Equivalent:** ${CONFIG.budgetIdeal}-${CONFIG.budgetMax} RMB/month\n\n`;

  md += '| # | Title | Daily | Total | Kitchen | Fridge | Washer | Metro | Score | Link |\n';
  md += '|---|-------|-------|-------|---------|--------|--------|-------|-------|------|\n';

  listings.forEach((l, i) => {
    md += `| ${i + 1} `;
    md += `| ${(l.title || 'No title').substring(0, 40)} `;
    md += `| ¥${l.priceDaily} `;
    md += `| ¥${l.priceTotal} `;
    md += `| ${l.hasKitchen ? '✓' : '✗'} `;
    md += `| ${l.hasFridge ? '✓' : '✗'} `;
    md += `| ${l.hasWashingMachine ? '✓' : '✗'} `;
    md += `| ${l.hasMetro ? '✓' : '✗'} `;
    md += `| ${l.score} `;
    md += `| ${l.url ? `[View](${l.url})` : '-'} |\n`;
  });

  md += '\n## Legend\n\n';
  md += '- **Daily**: Price per day (RMB)\n';
  md += `- **Total**: Total price for ${CONFIG.days} days stay\n`;
  md += '- **Kitchen**: 厨房 (required)\n';
  md += '- **Fridge**: 冰箱 (required)\n';
  md += '- **Washer**: 洗衣机 (bonus)\n';
  md += '- **Metro**: Near metro station (bonus)\n';
  md += '- **Score**: Higher = better (price + amenities + location)\n';

  return md;
}

// Run
scrapMinsuXiaozhu().catch(console.error);