import os
import sys
from typing import List, Optional
import asyncio
from dataclasses import dataclass
from datetime import datetime, timedelta
from dotenv import load_dotenv
import logging

# Set up logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

# Load environment variables from .env file
env_path = os.path.join(os.path.dirname(os.path.dirname(os.path.abspath(__file__))), '.env')
load_dotenv(dotenv_path=env_path)

# Debug: Print environment variables
logger.info(f"Current working directory: {os.getcwd()}")
logger.info(f"Loading .env from: {env_path}")
logger.info(f"GEMINI_API_KEY: {'*' * 8 + os.getenv('GEMINI_API_KEY', '')[-4:] if os.getenv('GEMINI_API_KEY') else 'Not set'}")
logger.info(f"GEMINI_API_KEYS: {'*' * 8 + os.getenv('GEMINI_API_KEYS', '')[-4:] if os.getenv('GEMINI_API_KEYS') else 'Not set'}")

@dataclass
class APIKey:
    key: str
    last_used: Optional[datetime] = None
    is_available: bool = True
    rate_limit_reset: Optional[datetime] = None

class APIKeyManager:
    _instance = None
    _lock = asyncio.Lock()
    
    def __new__(cls):
        if cls._instance is None:
            cls._instance = super(APIKeyManager, cls).__new__(cls)
            cls._instance._initialize()
        return cls._instance
    
    def _initialize(self):
        self.keys: List[APIKey] = []
        self._current_index = 0
        self._load_api_keys()
    
    def _load_api_keys(self):
        # Try to load from GEMINI_API_KEY first
        single_key = os.getenv('GEMINI_API_KEY', '').strip()
        if single_key:
            single_key = single_key.strip('"\'')
            self.keys = [APIKey(key=single_key)]
            logger.info(f"Loaded 1 API key from GEMINI_API_KEY")
            return
            
        # Fall back to GEMINI_API_KEYS if GEMINI_API_KEY is not set
        api_keys_str = os.getenv('GEMINI_API_KEYS', '').strip()
        if api_keys_str:
            keys = [key.strip().strip('"\'') for key in api_keys_str.split(',') if key.strip()]
            self.keys = [APIKey(key=key) for key in keys]
            logger.info(f"Loaded {len(keys)} API keys from GEMINI_API_KEYS")
            return
            
        logger.warning("No API keys found in environment variables")
    
    def get_available_key(self) -> Optional[str]:
        """Get an available API key, considering rate limits."""
        now = datetime.utcnow()
        
        for key_obj in self.keys:
            if not key_obj.is_available:
                if key_obj.rate_limit_reset and now >= key_obj.rate_limit_reset:
                    key_obj.is_available = True
                    key_obj.rate_limit_reset = None
                else:
                    continue
            
            key_obj.last_used = now
            return key_obj.key
        
        return None
    
    def mark_key_unavailable(self, key: str, retry_after_seconds: int = 60):
        """Mark a key as unavailable due to rate limiting."""
        for key_obj in self.keys:
            if key_obj.key == key:
                key_obj.is_available = False
                key_obj.rate_limit_reset = datetime.utcnow() + timedelta(seconds=retry_after_seconds)
                logger.warning(f"Rate limit hit for API key. Will retry after {retry_after_seconds} seconds")
                return
        logger.warning(f"Tried to mark unknown API key as unavailable")

api_key_manager = APIKeyManager()