"""Repository for market_data table operations."""

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

from sqlalchemy import desc
from sqlalchemy.dialects.postgresql import insert

from ..models import MarketData
from data.common.data_types import OHLCVCandle
from .base_repository import BaseRepository, DatabaseOperationError


class MarketDataRepository(BaseRepository):
    """Repository for market_data table operations."""
    
    def upsert_candle(self, candle: OHLCVCandle, force_update: bool = False) -> bool:
        """
        Insert or update a candle in the market_data table using the ORM.
        """
        try:
            with self.get_session() as session:
                
                values = {
                    'exchange': candle.exchange,
                    'symbol': candle.symbol,
                    'timeframe': candle.timeframe,
                    'timestamp': candle.end_time,
                    'open': candle.open,
                    'high': candle.high,
                    'low': candle.low,
                    'close': candle.close,
                    'volume': candle.volume,
                    'trades_count': candle.trade_count
                }
                
                stmt = insert(MarketData).values(values)
                
                if force_update:
                    update_stmt = stmt.on_conflict_do_update(
                        index_elements=['exchange', 'symbol', 'timeframe', 'timestamp'],
                        set_={
                            'open': stmt.excluded.open,
                            'high': stmt.excluded.high,
                            'low': stmt.excluded.low,
                            'close': stmt.excluded.close,
                            'volume': stmt.excluded.volume,
                            'trades_count': stmt.excluded.trades_count
                        }
                    )
                    action = "Updated"
                    final_stmt = update_stmt
                else:
                    ignore_stmt = stmt.on_conflict_do_nothing(
                        index_elements=['exchange', 'symbol', 'timeframe', 'timestamp']
                    )
                    action = "Stored"
                    final_stmt = ignore_stmt

                session.execute(final_stmt)
                session.commit()
                
                self.log_debug(f"{action} candle: {candle.symbol} {candle.timeframe} at {candle.end_time} (force_update={force_update})")
                return True
                
        except Exception as e:
            self.log_error(f"Error storing candle {candle.symbol} {candle.timeframe}: {e}")
            raise DatabaseOperationError(f"Failed to store candle: {e}")
    
    def get_candles(self, 
                   symbol: str, 
                   timeframe: str, 
                   start_time: datetime, 
                   end_time: datetime,
                   exchange: str = "okx") -> List[Dict[str, Any]]:
        """
        Retrieve candles from the database using the ORM.
        """
        try:
            with self.get_session() as session:
                query = (
                    session.query(MarketData)
                    .filter(
                        MarketData.exchange == exchange,
                        MarketData.symbol == symbol,
                        MarketData.timeframe == timeframe,
                        MarketData.timestamp >= start_time,
                        MarketData.timestamp <= end_time
                    )
                    .order_by(MarketData.timestamp.asc())
                )
                
                results = query.all()
                
                candles = [
                    {
                        "exchange": r.exchange, "symbol": r.symbol, "timeframe": r.timeframe,
                        "timestamp": r.timestamp, "open": r.open, "high": r.high,
                        "low": r.low, "close": r.close, "volume": r.volume,
                        "trades_count": r.trades_count, "created_at": r.created_at
                    } for r in results
                ]
                
                self.log_debug(f"Retrieved {len(candles)} candles for {symbol} {timeframe}")
                return candles
                
        except Exception as e:
            self.log_error(f"Error retrieving candles: {e}")
            raise DatabaseOperationError(f"Failed to retrieve candles: {e}")
    
    def get_latest_candle(self, symbol: str, timeframe: str, exchange: str = "okx") -> Optional[Dict[str, Any]]:
        """
        Get the latest candle for a symbol and timeframe using the ORM.
        """
        try:
            with self.get_session() as session:
                latest = (
                    session.query(MarketData)
                    .filter(
                        MarketData.exchange == exchange,
                        MarketData.symbol == symbol,
                        MarketData.timeframe == timeframe
                    )
                    .order_by(MarketData.timestamp.desc())
                    .first()
                )

                if latest:
                    return {
                        "exchange": latest.exchange, "symbol": latest.symbol, "timeframe": latest.timeframe,
                        "timestamp": latest.timestamp, "open": latest.open, "high": latest.high,
                        "low": latest.low, "close": latest.close, "volume": latest.volume,
                        "trades_count": latest.trades_count, "created_at": latest.created_at
                    }
                return None
                
        except Exception as e:
            self.log_error(f"Error retrieving latest candle for {symbol} {timeframe}: {e}")
            raise DatabaseOperationError(f"Failed to retrieve latest candle: {e}")