"""Data service for managing government transparency data."""

from typing import Dict, List, Optional
from datetime import datetime, date


class DataService:
    """Service for data operations and management."""
    
    def __init__(self):
        self._cache = {}
        self._last_updated = None
    
    async def fetch_contracts(self, filters: Optional[Dict] = None) -> List[Dict]:
        """Fetch government contracts data."""
        # TODO: Integrate with actual Portal da Transparência API
        return []
    
    async def fetch_expenses(self, filters: Optional[Dict] = None) -> List[Dict]:
        """Fetch government expenses data."""
        # TODO: Integrate with actual Portal da Transparência API
        return []
    
    async def fetch_agreements(self, filters: Optional[Dict] = None) -> List[Dict]:
        """Fetch government agreements data."""
        # TODO: Integrate with actual Portal da Transparência API
        return []
    
    async def search_entities(self, query: str) -> List[Dict]:
        """Search for government entities."""
        # TODO: Implement entity search
        return []
    
    async def get_data_summary(self, data_type: str) -> Dict:
        """Get summary statistics for data type."""
        return {
            "type": data_type,
            "total_records": 0,
            "last_updated": self._last_updated,
            "status": "stub_implementation"
        }
    
    def clear_cache(self) -> None:
        """Clear service cache."""
        self._cache.clear()
        self._last_updated = datetime.now()

# Create singleton instance
data_service = DataService()