// Pokemon Stock Monitor - Content Script
// Runs on PokemonCenter pages to extract product data

(function() {
  console.log("[Pokemon Monitor] Content script loaded on:", window.location.href);

  // Listen for messages from background script
  chrome.runtime.onMessage.addListener((message, sender, sendResponse) => {
    if (message.type === "extractProducts") {
      console.log("[Pokemon Monitor] Extracting products...");
      debugPageContent();
      const products = extractProducts();
      console.log("[Pokemon Monitor] Found", products.length, "products");
      sendResponse(products);
    }
    return true;
  });

  // Debug function to see what's on the page
  function debugPageContent() {
    console.log("[Pokemon Monitor] === PAGE DEBUG ===");
    console.log("[Pokemon Monitor] Title:", document.title);
    console.log("[Pokemon Monitor] Body text length:", document.body?.textContent?.length || 0);

    // Check for bot protection indicators
    const bodyText = document.body?.textContent?.toLowerCase() || "";
    if (bodyText.includes("verify") || bodyText.includes("robot") || bodyText.includes("captcha")) {
      console.log("[Pokemon Monitor] WARNING: Possible bot protection detected!");
    }

    // Count all links
    const allLinks = document.querySelectorAll('a');
    console.log("[Pokemon Monitor] Total links on page:", allLinks.length);

    // Check for product links with various patterns
    const productLinks = document.querySelectorAll('a[href*="/product/"]');
    console.log("[Pokemon Monitor] Links with /product/:", productLinks.length);

    // Try alternative selectors
    const cardLinks = document.querySelectorAll('[class*="product"] a, [class*="card"] a, [class*="tile"] a');
    console.log("[Pokemon Monitor] Links in product/card/tile containers:", cardLinks.length);

    // Sample some hrefs to understand page structure
    const sampleHrefs = Array.from(allLinks).slice(0, 10).map(a => a.href);
    console.log("[Pokemon Monitor] Sample hrefs:", sampleHrefs);

    // Look for any elements that might be products
    const possibleProducts = document.querySelectorAll('[class*="product"], [class*="card"], [data-product], [data-item]');
    console.log("[Pokemon Monitor] Elements with product/card classes:", possibleProducts.length);

    console.log("[Pokemon Monitor] === END DEBUG ===");
  }

  function extractProducts() {
    const products = [];

    // Group all product links by URL
    const urlToLinks = {};
    document.querySelectorAll('a[href*="/product/"]').forEach(link => {
      const url = link.href;
      if (!urlToLinks[url]) {
        urlToLinks[url] = [];
      }
      urlToLinks[url].push(link);
    });

    console.log("[Pokemon Monitor] Found", Object.keys(urlToLinks).length, "unique product URLs");

    // Process each unique product URL
    for (const [url, links] of Object.entries(urlToLinks)) {
      // Find the best name from all links to this product
      let bestName = "";
      let isSoldOut = false;

      for (const link of links) {
        const text = link.textContent.trim();

        // Check if any link says "SOLD OUT"
        if (text.toUpperCase().includes("SOLD OUT")) {
          isSoldOut = true;
        }

        // Pick the longest non-"SOLD OUT" text as the name
        if (text.length > bestName.length &&
            !text.toUpperCase().startsWith("SOLD") &&
            text.length > 10) {
          bestName = text;
        }
      }

      // Skip if we couldn't find a good name
      if (!bestName || bestName.length < 10) continue;

      // Clean up name - remove price if embedded
      bestName = bestName.replace(/\$[\d,.]+/g, "").trim();
      // Remove "Add to Cart" etc
      bestName = bestName.replace(/Add to Cart/gi, "").trim();
      // Clean whitespace
      bestName = bestName.replace(/\s+/g, " ").trim();

      // Find price from any of the links' containers
      let price = null;
      for (const link of links) {
        let parent = link.parentElement;
        for (let i = 0; i < 6 && parent && !price; i++) {
          const priceMatch = parent.textContent.match(/\$[\d,]+\.?\d*/);
          if (priceMatch) {
            price = priceMatch[0];
            break;
          }
          parent = parent.parentElement;
        }
        if (price) break;
      }

      // Find image from any of the links
      let imageUrl = null;
      for (const link of links) {
        const img = link.querySelector("img") ||
                    link.closest("[class*='product']")?.querySelector("img");
        if (img) {
          imageUrl = img.src || img.dataset.src;
          if (imageUrl && !imageUrl.startsWith("data:")) break;
        }
      }

      // Extract product ID from URL
      const idMatch = url.match(/\/product\/([^\/]+)/);
      const productId = idMatch ? idMatch[1] : url;

      products.push({
        name: bestName,
        url: url,
        price: price,
        inStock: !isSoldOut,
        imageUrl: imageUrl,
        productId: productId,
        site: "pokemoncenter"
      });
    }

    console.log("[Pokemon Monitor] Extracted products:", products.map(p => ({name: p.name.slice(0,40), inStock: p.inStock})));
    return products;
  }
})();