# ================================================================
# services/data/app/external/base_client.py
# ================================================================
"""Base HTTP client for external APIs - Enhanced for AEMET"""

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

logger = structlog.get_logger()

class BaseAPIClient:
    
    def __init__(self, base_url: str, api_key: Optional[str] = None):
        self.base_url = base_url
        self.api_key = api_key
        self.timeout = httpx.Timeout(30.0)
    
    async def _get(self, endpoint: str, params: Optional[Dict] = None, headers: Optional[Dict] = None) -> Optional[Dict[str, Any]]:
        """Make GET request"""
        try:
            url = f"{self.base_url}{endpoint}"
            
            # Add API key to params for AEMET (not headers)
            request_params = params or {}
            if self.api_key:
                request_params["api_key"] = self.api_key
            
            # Add headers if provided
            request_headers = headers or {}
            
            logger.debug("Making API request", url=url, params=request_params)
            
            async with httpx.AsyncClient(timeout=self.timeout) as client:
                response = await client.get(url, params=request_params, headers=request_headers)
                response.raise_for_status()
                
                # Log response for debugging
                response_data = response.json()
                logger.debug("API response received", 
                           status_code=response.status_code, 
                           response_keys=list(response_data.keys()) if isinstance(response_data, dict) else "non-dict")
                
                return response_data
                
        except httpx.HTTPStatusError as e:
            logger.error("HTTP error", status_code=e.response.status_code, url=url, response_text=e.response.text[:200])
            return None
        except httpx.RequestError as e:
            logger.error("Request error", error=str(e), url=url)
            return None
        except Exception as e:
            logger.error("Unexpected error", error=str(e), url=url)
            return None
    
    async def _fetch_url_directly(self, url: str, headers: Optional[Dict] = None) -> Optional[Dict[str, Any]]:
        """Fetch data directly from a full URL (for AEMET datos URLs)"""
        try:
            request_headers = headers or {}
            
            logger.debug("Making direct URL request", url=url)
            
            async with httpx.AsyncClient(timeout=self.timeout) as client:
                response = await client.get(url, headers=request_headers)
                response.raise_for_status()
                
                # Handle encoding issues common with Spanish data sources
                try:
                    response_data = response.json()
                except UnicodeDecodeError:
                    logger.warning("UTF-8 decode failed, trying alternative encodings", url=url)
                    # Try common Spanish encodings
                    for encoding in ['latin-1', 'windows-1252', 'iso-8859-1']:
                        try:
                            text_content = response.content.decode(encoding)
                            import json
                            response_data = json.loads(text_content)
                            logger.info("Successfully decoded with encoding", encoding=encoding)
                            break
                        except (UnicodeDecodeError, json.JSONDecodeError):
                            continue
                    else:
                        logger.error("Failed to decode response with any encoding", url=url)
                        return None
                
                logger.debug("Direct URL response received", 
                           status_code=response.status_code,
                           data_type=type(response_data),
                           data_length=len(response_data) if isinstance(response_data, (list, dict)) else "unknown")
                
                return response_data
                
        except httpx.HTTPStatusError as e:
            logger.error("HTTP error in direct fetch", status_code=e.response.status_code, url=url)
            return None
        except httpx.RequestError as e:
            logger.error("Request error in direct fetch", error=str(e), url=url)
            return None
        except Exception as e:
            logger.error("Unexpected error in direct fetch", error=str(e), url=url)
            return None
    
    async def _post(self, endpoint: str, data: Optional[Dict] = None, headers: Optional[Dict] = None) -> Optional[Dict[str, Any]]:
        """Make POST request"""
        try:
            url = f"{self.base_url}{endpoint}"
            
            request_headers = headers or {}
            if self.api_key:
                request_headers["Authorization"] = f"Bearer {self.api_key}"
            
            async with httpx.AsyncClient(timeout=self.timeout) as client:
                response = await client.post(url, json=data, headers=request_headers)
                response.raise_for_status()
                return response.json()
                
        except httpx.HTTPStatusError as e:
            logger.error("HTTP error", status_code=e.response.status_code, url=url)
            return None
        except httpx.RequestError as e:
            logger.error("Request error", error=str(e), url=url)
            return None
        except Exception as e:
            logger.error("Unexpected error", error=str(e), url=url)
            return None