import httpx
import asyncio
from bs4 import BeautifulSoup
from django.utils import timezone
import random

async def fetch_product_details(client, link, basic_data):
    try:
        clean_path = link.replace('../../../', '')
        if 'catalogue/' not in clean_path:
            clean_path = f"catalogue/{clean_path}"
        
        full_url = f"http://books.toscrape.com/{clean_path}"
        
        response = await client.get(full_url, timeout=10.0)
        if response.status_code == 200:
            prod_soup = BeautifulSoup(response.content, 'html.parser')
            
            table = prod_soup.find('table', class_='table-striped')
            if table:
                rows = table.find_all('tr')
                for row in rows:
                    header = row.find('th').get_text(strip=True)
                    value = row.find('td').get_text(strip=True)
                    if header == 'UPC':
                        basic_data['sku'] = value
                        return basic_data
    except Exception:
        return None
    return None

async def scrape_products(b_url):
    b_url = b_url.rstrip('/')
    try:
        random_page = random.randint(1, 50)
        url = f"{b_url}/catalogue/page-{random_page}.html"
        
        headers = {'User-Agent': 'Mozilla/5.0'}
        async with httpx.AsyncClient(headers=headers, follow_redirects=True) as client:
            response = await client.get(url, timeout=15.0)
            soup = BeautifulSoup(response.content, 'html.parser')
            
            products_elements = soup.find_all('article', class_='product_pod')
            
            tasks = []
            for item in products_elements:
                title = item.h3.a['title']
                relative_link = item.h3.a['href']
                
                price_text = item.find('p', class_='price_color').text
                price = ''.join(c for c in price_text if c.isdigit() or c == '.')
                
                stock_text = item.find('p', class_='instock availability').text
                
                basic_data = {
                    'title': title,
                    'price': float(price) if price else 0.0,
                    'stock_status': "In stock" in stock_text,
                    'last_scraped_at': timezone.now()
                }
                
                tasks.append(fetch_product_details(client, relative_link, basic_data))
            
            scraped_data = await asyncio.gather(*tasks)
            
            return [data for data in scraped_data if data and data.get('sku')]
            
    except Exception as e:
        print(f"Scraping Error: {e}")
        return []