# ================================================================
# services/data/app/external/clients/madrid_client.py
# ================================================================
"""
Pure HTTP client for Madrid traffic APIs
Handles only HTTP communication and response decoding
"""

import httpx
import structlog
from datetime import datetime
from typing import Optional, Dict, Any

from ..base_client import BaseAPIClient


class MadridTrafficAPIClient(BaseAPIClient):
    """Pure HTTP client for Madrid traffic APIs"""
    
    TRAFFIC_ENDPOINT = "https://datos.madrid.es/egob/catalogo/202468-10-intensidad-trafico.xml"
    MEASUREMENT_POINTS_URL = "https://datos.madrid.es/egob/catalogo/202468-263-intensidad-trafico.csv"
    
    def __init__(self):
        super().__init__(base_url="https://datos.madrid.es")
        self.logger = structlog.get_logger()

    def _decode_response_content(self, response) -> Optional[str]:
        """Decode response content with multiple encoding attempts"""
        try:
            return response.text
        except UnicodeDecodeError:
            # Try manual encoding for Spanish content
            for encoding in ['utf-8', 'latin-1', 'windows-1252', 'iso-8859-1']:
                try:
                    content = response.content.decode(encoding)
                    if content and len(content) > 100:
                        self.logger.debug("Successfully decoded with encoding", encoding=encoding)
                        return content
                except UnicodeDecodeError:
                    continue
        return None

    def _build_historical_url(self, year: int, month: int) -> str:
        """Build historical ZIP URL for given year and month"""
        # Madrid historical data URL pattern
        base_url = "https://datos.madrid.es/egob/catalogo/208627"
        
        # URL numbering pattern (this may need adjustment based on actual URLs)
        if year == 2023:
            url_number = 116 + (month - 1)  # 116-127 for 2023
        elif year == 2024:
            url_number = 128 + (month - 1)  # 128-139 for 2024
        else:
            url_number = 116  # Fallback
        
        return f"{base_url}-{url_number}-transporte-ptomedida-historico.zip"

    async def fetch_current_traffic_xml(self, endpoint: Optional[str] = None) -> Optional[str]:
        """Fetch current traffic XML data"""
        endpoint = endpoint or self.TRAFFIC_ENDPOINT
        
        try:
            headers = {
                'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36',
                'Accept': 'application/xml,text/xml,*/*',
                'Accept-Language': 'es-ES,es;q=0.9,en;q=0.8',
                'Accept-Encoding': 'gzip, deflate, br',
                'Cache-Control': 'no-cache',
                'Referer': 'https://datos.madrid.es/'
            }
            
            response = await self.get(endpoint, headers=headers, timeout=30)
            
            if not response or response.status_code != 200:
                self.logger.warning("Failed to fetch XML data", 
                                  endpoint=endpoint, 
                                  status=response.status_code if response else None)
                return None
            
            # Get XML content with encoding handling
            xml_content = self._decode_response_content(response)
            if not xml_content:
                self.logger.debug("No XML content received", endpoint=endpoint)
                return None
            
            self.logger.debug("Madrid XML content fetched", 
                            length=len(xml_content),
                            endpoint=endpoint)
            
            return xml_content
                
        except Exception as e:
            self.logger.error("Error fetching traffic XML data", 
                            endpoint=endpoint, 
                            error=str(e))
            return None

    async def fetch_measurement_points_csv(self, url: Optional[str] = None) -> Optional[str]:
        """Fetch measurement points CSV data"""
        url = url or self.MEASUREMENT_POINTS_URL
        
        try:
            async with httpx.AsyncClient(
                timeout=30.0,
                headers={
                    'User-Agent': 'MadridTrafficClient/2.0',
                    'Accept': 'text/csv,application/csv,*/*'
                },
                follow_redirects=True
            ) as client:
                
                self.logger.debug("Fetching measurement points registry", url=url)
                response = await client.get(url)
                
                if response.status_code == 200:
                    return response.text
                else:
                    self.logger.warning("Failed to fetch measurement points", 
                                      status=response.status_code, url=url)
                    return None
                    
        except Exception as e:
            self.logger.error("Error fetching measurement points registry", 
                            url=url, error=str(e))
            return None

    async def fetch_historical_zip(self, zip_url: str) -> Optional[bytes]:
        """Fetch historical traffic ZIP file"""
        try:
            async with httpx.AsyncClient(
                timeout=120.0,  # Longer timeout for large files
                headers={
                    'User-Agent': 'MadridTrafficClient/2.0',
                    'Accept': 'application/zip,*/*'
                },
                follow_redirects=True
            ) as client:
                
                self.logger.debug("Fetching historical ZIP", url=zip_url)
                response = await client.get(zip_url)
                
                if response.status_code == 200:
                    self.logger.debug("Historical ZIP fetched", 
                                    url=zip_url,
                                    size=len(response.content))
                    return response.content
                else:
                    self.logger.warning("Failed to fetch historical ZIP", 
                                      status=response.status_code, url=zip_url)
                    return None
                    
        except Exception as e:
            self.logger.error("Error fetching historical ZIP", 
                            url=zip_url, error=str(e))
            return None