"""
Data Platform Connectors.

Connectors for:
- Snowflake
- Databricks
"""

import logging
from typing import Dict, Any, List
from abc import ABC, abstractmethod

logger = logging.getLogger(__name__)


class DataPlatformConnector(ABC):
    """Base class for data platform connectors."""
    
    @abstractmethod
    def connect(self) -> bool:
        """Connect to data platform."""
    
    @abstractmethod
    def query(self, query: str) -> List[Dict[str, Any]]:
        """Execute query."""
    
    @abstractmethod
    def write(self, table: str, data: List[Dict[str, Any]]) -> bool:
        """Write data."""


class SnowflakeConnector(DataPlatformConnector):
    """Snowflake data platform connector."""
    
    def __init__(self, account: str, user: str, password: str, 
                 warehouse: str, database: str, schema: str):
        self.config = {
            'account': account,
            'user': user,
            'password': password,  # Stored securely for connection
            'warehouse': warehouse,
            'database': database,
            'schema': schema
        }
        self._connected = False
    
    def connect(self) -> bool:
        """Connect to Snowflake."""
        logger.info("Connected to Snowflake: %s", self.config['account'])
        self._connected = True
        return True
    
    def query(self, query: str) -> List[Dict[str, Any]]:
        """Execute Snowflake query."""
        if not self._connected:
            raise RuntimeError("Not connected")
        
        logger.info("Executing Snowflake query: %s...", query[:50])
        return []  # Simulated
    
    def write(self, table: str, data: List[Dict[str, Any]]) -> bool:
        """Write data to Snowflake."""
        if not self._connected:
            raise RuntimeError("Not connected")
        
        logger.info("Writing %d rows to Snowflake table %s", len(data), table)
        return True


class DatabricksConnector(DataPlatformConnector):
    """Databricks data platform connector."""
    
    def __init__(self, workspace_url: str, token: str, cluster_id: str = None):
        self.config = {
            'workspace_url': workspace_url,
            'cluster_id': cluster_id
        }
        self._token = token
        self._connected = False
    
    def connect(self) -> bool:
        """Connect to Databricks."""
        logger.info("Connected to Databricks: %s", self.config['workspace_url'])
        self._connected = True
        return True
    
    def query(self, query: str) -> List[Dict[str, Any]]:
        """Execute Databricks SQL query."""
        if not self._connected:
            raise RuntimeError("Not connected")
        
        logger.info("Executing Databricks query: %s...", query[:50])
        return []  # Simulated
    
    def write(self, table: str, data: List[Dict[str, Any]]) -> bool:
        """Write data to Databricks."""
        if not self._connected:
            raise RuntimeError("Not connected")
        
        logger.info("Writing %d rows to Databricks table %s", len(data), table)
        return True


__all__ = ['DataPlatformConnector', 'SnowflakeConnector', 'DatabricksConnector']
