"""
CVR.dk API service for looking up Danish company information
Free public API - no authentication required
Adapted from OmniSync for BMC Hub
"""
import asyncio
import aiohttp
import logging
from typing import Optional, Dict

logger = logging.getLogger(__name__)


class CVRService:
    """Service for CVR.dk API lookups"""
    
    BASE_URL = "https://cvrapi.dk/api"
    
    async def lookup_by_name(self, company_name: str) -> Optional[Dict]:
        """
        Lookup company by name using CVR.dk API
        
        Args:
            company_name: Company name to search for
            
        Returns:
            Company data dict or None if not found
        """
        if not company_name or len(company_name) < 3:
            return None
        
        # Clean company name
        clean_name = company_name.strip()
        
        try:
            params = {
                'search': clean_name,
                'country': 'dk'
            }
            
            async with aiohttp.ClientSession() as session:
                async with session.get(
                    f"{self.BASE_URL}",
                    params=params,
                    timeout=aiohttp.ClientTimeout(total=10)
                ) as response:
                    if response.status == 200:
                        data = await response.json()
                        
                        if data and 'vat' in data:
                            logger.info(f"✅ Found CVR {data['vat']} for '{company_name}'")
                            return {
                                'cvr': data.get('vat'),
                                'name': data.get('name'),
                                'address': data.get('address'),
                                'city': data.get('city'),
                                'zipcode': data.get('zipcode'),
                                'country': data.get('country'),
                                'phone': data.get('phone'),
                                'email': data.get('email'),
                                'vat': data.get('vat'),
                                'status': data.get('status')
                            }
                    
                    elif response.status == 404:
                        logger.warning(f"⚠️ No CVR found for '{company_name}'")
                        return None
                    
                    else:
                        logger.error(f"❌ CVR API error {response.status} for '{company_name}'")
                        return None
                        
        except asyncio.TimeoutError:
            logger.error(f"⏱️ CVR API timeout for '{company_name}'")
            return None
            
        except Exception as e:
            logger.error(f"❌ CVR lookup error for '{company_name}': {e}")
            return None
    
    async def lookup_by_cvr(self, cvr_number: str) -> Optional[Dict]:
        """
        Lookup company by CVR number
        
        Args:
            cvr_number: CVR number (8 digits)
            
        Returns:
            Company data dict or None if not found
        """
        if not cvr_number:
            return None
        
        # Extract only digits
        cvr_clean = ''.join(filter(str.isdigit, str(cvr_number)))
        
        if len(cvr_clean) != 8:
            logger.warning(f"⚠️ Invalid CVR number format: {cvr_number}")
            return None
        
        try:
            async with aiohttp.ClientSession() as session:
                async with session.get(
                    f"{self.BASE_URL}",
                    params={'vat': cvr_clean, 'country': 'dk'},
                    timeout=aiohttp.ClientTimeout(total=10)
                ) as response:
                    if response.status == 200:
                        data = await response.json()
                        
                        if data and 'vat' in data:
                            logger.info(f"✅ Validated CVR {cvr_clean}")
                            return {
                                'cvr': data.get('vat'),
                                'name': data.get('name'),
                                'address': data.get('address'),
                                'city': data.get('city'),
                                'zipcode': data.get('zipcode'),
                                'postal_code': data.get('zipcode'),  # Alias for consistency
                                'country': data.get('country'),
                                'phone': data.get('phone'),
                                'email': data.get('email'),
                                'vat': data.get('vat'),
                                'status': data.get('status')
                            }
                    
                    return None
                    
        except Exception as e:
            logger.error(f"❌ CVR validation error for {cvr_number}: {e}")
            return None


def get_cvr_service() -> CVRService:
    """Get CVR service instance"""
    return CVRService()