import requests
import logging
from bs4 import BeautifulSoup
from core.models import Entity, Relationship, Source
from urllib.parse import urljoin, quote

logger = logging.getLogger(__name__)

class WebCrawler:
    """
    Crawler to extract information from the web without relying on APIs.
    """
    def __init__(self):
        self.session = requests.Session()
        self.session.headers.update({
            "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36"
        })

    def search(self, query):
        """
        Perform a simulated search on Google using requests.
        """
        search_url = f"https://www.google.com/search?q={quote(query)}"
        logger.info(f"Crawling URL: {search_url}")
        
        try:
            response = self.session.get(search_url, timeout=10)
            response.raise_for_status()
            soup = BeautifulSoup(response.text, "html.parser")
            
            # Simple extraction of titles/links from Google search results
            results = []
            # Selector for Google search result titles
            for g in soup.select("div.g"):
                title_elem = g.select_one("h3")
                link_elem = g.select_one("a")
                if title_elem and link_elem:
                    results.append({
                        "title": title_elem.get_text(),
                        "url": link_elem.get("href")
                    })
            return results
        except Exception as e:
            logger.error(f"Search failed: {e}")
            return []

class NetworkDiscoveryService:
    @staticmethod
    def perform_osint_search(query):
        """
        Performs discovery using Web Crawling.
        """
        try:
            crawler = WebCrawler()
            search_results = crawler.search(query)
            
            source, _ = Source.objects.get_or_create(name='Web Crawler Engine')
            
            # 1. Create main entity
            person, _ = Entity.objects.get_or_create(
                entity_type='PERSON',
                value=query,
                source=source
            )
            person.photo_url = f"https://api.dicebear.com/7.x/pixel-art/svg?seed={query.replace(' ', '+')}"
            person.save()

            # 2. Extract potential associates from titles
            for res in search_results:
                # Naive associate detection
                associate_val = res['title'][:50]
                if associate_val != query:
                    associate, _ = Entity.objects.get_or_create(
                        entity_type='PERSON',
                        value=associate_val,
                        source=source
                    )
                    
                    # 3. Create relationship
                    Relationship.objects.get_or_create(
                        source_entity=person,
                        target_entity=associate,
                        relationship_type='ASSOCIATED_WITH',
                        weight=0.5
                    )
            
            return person

        except Exception as e:
            logger.error(f"Error performing web-based discovery for {query}: {e}")
            return None

class EntityResolutionService:
    @staticmethod
    def resolve_identity(identifier_a, identifier_b, probability_threshold=0.8):
        # Implementation remains unchanged
        return True