import pandas as pd
from datetime import datetime, timedelta
from db.db_connection import create_client

def validate_signal_date(signal_date: datetime) -> datetime:
    """
    Validate and adjust signal date if needed
    
    Args:
        signal_date (datetime): Signal date to validate
        
    Returns:
        datetime: Valid signal date (not in future)
    """
    current_date = datetime.now()
    if signal_date > current_date:
        return current_date
    return signal_date

def print_signal(signal_data: dict, signal_type: str = "🔍") -> None:
    """
    Print standardized signal output
    
    Args:
        signal_data (dict): Dictionary containing signal information
        signal_type (str): Emoji indicator for signal type (default: 🔍)
    """
    try:
        print(f"\n{signal_type} {signal_data['ticker']} @ ${signal_data['entry_price']:.2f} on {signal_data['signal_date'].strftime('%Y-%m-%d %H:%M')}")
        print(f"   Size: {signal_data['shares']} shares (${signal_data['position_size']:.2f})")
        print(f"   Stop: ${signal_data['stop_loss']:.2f} (7%) | Target: ${signal_data['target_price']:.2f}")
        print(f"   Risk/Reward: 1:{signal_data['risk_reward_ratio']:.1f} | Risk: ${abs(signal_data['risk_amount']):.2f}")
        print(f"   Potential Profit: ${signal_data['profit_amount']:.2f}")
    except KeyError as e:
        print(f"Error printing signal: Missing key {e}")

def save_signals_to_csv(signals: list, scanner_name: str) -> None:
    """
    Save signals to CSV file with standardized format and naming
    
    Args:
        signals (list): List of signal dictionaries
        scanner_name (str): Name of the scanner for file naming
    """
    if not signals:
        print("\nNo signals found")
        return
        
    output_dir = 'reports'
    os.makedirs(output_dir, exist_ok=True)
    output_date = datetime.now().strftime("%Y%m%d_%H%M")
    output_file = f'{output_dir}/{scanner_name}_{output_date}.csv'
    
    df_signals = pd.DataFrame(signals)
    df_signals.to_csv(output_file, index=False)
    print(f"\nSaved {len(signals)} signals to {output_file}")

def get_stock_data(ticker: str, start_date: datetime, end_date: datetime, interval: str) -> pd.DataFrame:
    """
    Fetch stock data from the database with enhanced fallback logic
    
    Args:
        ticker (str): Stock ticker symbol
        start_date (datetime): Start date for data fetch
        end_date (datetime): End date for data fetch
        interval (str): Time interval for data ('daily', '5min', etc.)
        
    Returns:
        pd.DataFrame: DataFrame with OHLCV data
    """
    try:
        client = create_client()
        
        # Expand window to 90 days for more data robustness
        start_date = start_date - timedelta(days=90)
        
        # First try primary data source
        if interval == "daily":
            table = "stock_prices_daily"
        else:
            table = "stock_prices"
        
        # Unified query format
        query = f"""
            SELECT 
                toDateTime(window_start/1000000000) as date,
                open,
                high,
                low,
                close,
                volume
            FROM stock_db.stock_prices
            WHERE ticker = '{ticker}'
            AND window_start BETWEEN 
                {int(start_date.timestamp() * 1e9)} AND 
                {int(end_date.timestamp() * 1e9)}
            AND toDateTime(window_start/1000000000) <= now()
            ORDER BY date ASC
        """
        
        result = client.query(query)
        
        # Fallback to intraday data if needed
        if not result.result_rows and interval == "daily":
            print(f"⚠️ No daily data for {ticker}, resampling from intraday data")
            intraday_query = f"""
                SELECT
                    toDateTime(window_start/1000000000) as date,
                    first_value(open) AS open,
                    max(high) AS high,
                    min(low) AS low,
                    last_value(close) AS close,
                    sum(volume) AS volume
                FROM stock_db.stock_prices
                WHERE ticker = '{ticker}'
                AND window_start BETWEEN 
                    {int(start_date.timestamp() * 1e9)} AND 
                    {int(end_date.timestamp() * 1e9)}
                AND toYear(toDateTime(window_start/1000000000)) <= toYear(now())
                AND toYear(toDateTime(window_start/1000000000)) >= (toYear(now()) - 1)
                GROUP BY date
                ORDER BY date ASC
            """
            result = client.query(intraday_query)
            
        # Fallback to different intervals if still empty    
        if not result.result_rows:
            print(f"⚠️ No {interval} data for {ticker}, trying weekly")
            weekly_query = f"""
                SELECT
                    toStartOfWeek(window_start) AS date,
                    first_value(open) AS open,
                    max(high) AS high,
                    min(low) AS low,
                    last_value(close) AS close,
                    sum(volume) AS volume
                FROM stock_db.stock_prices
                WHERE ticker = '{ticker}'
                GROUP BY date
                ORDER BY date ASC
            """
            result = client.query(weekly_query)
            
        if not result.result_rows:
            return pd.DataFrame()
            
        df = pd.DataFrame(
            result.result_rows,
            columns=['date', 'open', 'high', 'low', 'close', 'volume']
        )

        # Convert numeric columns
        numeric_columns = ['open', 'high', 'low', 'close', 'volume']
        for col in numeric_columns:
            df[col] = pd.to_numeric(df[col], errors='coerce')

        # Handle null values
        if df['close'].isnull().any():
            print(f"Warning: Found null values in close prices")
            df = df.dropna(subset=['close'])

        if df.empty or 'close' not in df.columns:
            return pd.DataFrame()
            
        if df['date'].dtype == object:
            df['date'] = pd.to_datetime(df['date'])
            
        return df

    except Exception as e:
        print(f"Error fetching {ticker} data: {str(e)}")
        return pd.DataFrame()