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

logger = logging.getLogger(__name__)

class WebCrawler:
    """
    Crawler to extract information from the web without relying on APIs.
    """
    def __init__(self, start_url):
        self.start_url = start_url
        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 crawl(self, query):
        """
        Main entry point for web crawling.
        """
        logger.info(f"Starting crawl for: {query}")
        # 1. Perform search queries on Google/Bing or specialized sites
        # 2. Extract links and parse content
        # 3. Identify new entities and relationships
        return self._simulate_discovery(query)

    def _simulate_discovery(self, query):
        # This will be replaced by actual logic using BeautifulSoup/requests
        return {
            "entities": [
                {"type": "PERSON", "value": query, "identifier": "WEB-ID-1"},
                {"type": "PERSON", "value": "Associate of " + query, "identifier": "WEB-ID-2"},
            ],
            "relationships": [
                {"source": query, "target": "Associate of " + query, "type": "ASSOCIATED_WITH"}
            ]
        }

class NetworkDiscoveryService:
    @staticmethod
    def perform_osint_search(query):
        """
        Performs discovery using Web Crawling.
        """
        try:
            crawler = WebCrawler(start_url="https://www.google.com")
            data = crawler.crawl(query)
            
            source, _ = Source.objects.get_or_create(name='Web Crawler Engine')
            
            person = None
            for ent_data in data.get("entities", []):
                entity, _ = Entity.objects.get_or_create(
                    entity_type=ent_data['type'], 
                    value=ent_data['value'], 
                    source=source
                )
                entity.photo_url = f"https://api.dicebear.com/7.x/pixel-art/svg?seed={ent_data['value'].replace(' ', '+')}"
                entity.identifier_code = ent_data.get('identifier', 'UNKNOWN')
                entity.save()
                
                if ent_data['type'] == 'PERSON':
                    person = entity

            for rel_data in data.get("relationships", []):
                s_entity = Entity.objects.filter(value=rel_data['source']).first()
                t_entity = Entity.objects.filter(value=rel_data['target']).first()
                
                if s_entity and t_entity:
                    Relationship.objects.get_or_create(
                        source_entity=s_entity,
                        target_entity=t_entity,
                        relationship_type=rel_data['type'],
                        weight=0.9
                    )
            
            return person or Entity.objects.filter(value=query).first()

        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