import os
import re
import urllib.parse
from dotenv import load_dotenv

class Config:
    def __init__(self):
        load_dotenv()
        
        # Detect if running on HF Spaces
        self.is_hf_space = bool(os.getenv("SPACE_ID"))
        
        # API tokens
        self.hf_token = os.getenv("HF_TOKEN")
        self.openai_api_key = os.getenv("OPENAI_API_KEY")
        
        # API endpoints
        self.hf_api_url = self._sanitize_url(os.getenv("HF_API_ENDPOINT_URL", "https://api-inference.huggingface.co/v1/"))
        
        # Fallback settings
        self.use_fallback = os.getenv("USE_FALLBACK", "true").lower() == "true"
        
        # Redis configuration (optional for HF)
        self.redis_host = self._sanitize_host(os.getenv("REDIS_HOST", ""))
        self.redis_port = int(os.getenv("REDIS_PORT", "6379"))
        self.redis_username = os.getenv("REDIS_USERNAME", "")
        self.redis_password = os.getenv("REDIS_PASSWORD", "")
        self.redis_retries = int(os.getenv("REDIS_RETRIES", "3"))
        self.redis_retry_delay = int(os.getenv("REDIS_RETRY_DELAY", "1"))
        self.redis_disable_ssl = os.getenv("REDIS_DISABLE_SSL", "false").lower() == "true"
        
        # Local model configuration
        self.local_model_name = os.getenv("LOCAL_MODEL_NAME", "mistral:latest")
        self.ollama_host = self._sanitize_url(os.getenv("OLLAMA_HOST", ""))
        
        # OpenWeather API
        self.openweather_api_key = os.getenv("OPENWEATHER_API_KEY")
    
    def _sanitize_url(self, url: str) -> str:
        """Sanitize URL by removing whitespace and control characters"""
        if not url:
            return ""
        
        # Remove leading/trailing whitespace and control characters
        url = url.strip()
        
        # Remove any newlines, carriage returns, tabs, and null bytes
        url = re.sub(r'[\r\n\t\0\x0b\x0c]+', '', url)
        
        # Remove any trailing URL encoding artifacts
        url = url.rstrip('%0a').rstrip('%0d')
        
        # Validate URL format - if it looks like a URL but missing scheme
        if url and not re.match(r'^https?://', url):
            # Check if it looks like a domain
            if re.match(r'^[a-zA-Z0-9.-]+(?:\.[a-zA-Z]{2,})+', url) or 'ngrok' in url:
                # Assume https for ngrok and domains
                url = 'https://' + url
            else:
                # Otherwise default to http
                url = 'http://' + url
        
        return url
    
    def _sanitize_host(self, host: str) -> str:
        """Sanitize host by removing whitespace and control characters"""
        if not host:
            return ""
        
        # Remove leading/trailing whitespace and control characters
        host = host.strip()
        
        # Remove any newlines, carriage returns, tabs, and null bytes
        host = re.sub(r'[\r\n\t\0\x0b\x0c]+', '', host)
        
        # Remove any trailing URL encoding artifacts
        host = host.rstrip('%0a').rstrip('%0d')
        
        return host

# Global config instance
config = Config()