"""RSI (Relative Strength Index) strategy."""

import pandas as pd
from decimal import Decimal
from typing import Optional, Dict, Any
from src.strategies.base import BaseStrategy, StrategySignal, SignalType
from src.data.indicators import get_indicators

class RSIStrategy(BaseStrategy):
    """RSI-based trading strategy."""
    
    def __init__(self, name: str, parameters: Optional[Dict[str, Any]] = None, timeframes: Optional[list] = None):
        """Initialize RSI strategy.
        
        Parameters:
            rsi_period: RSI period (default 14)
            oversold: Oversold threshold (default 30)
            overbought: Overbought threshold (default 70)
        """
        super().__init__(name, parameters, timeframes)
        self.rsi_period = self.parameters.get('rsi_period', 14)
        self.oversold = self.parameters.get('oversold', 30)
        self.overbought = self.parameters.get('overbought', 70)
        self.indicators = get_indicators()
        self._price_history = []
    
    async def on_tick(self, symbol: str, price: Decimal, timeframe: str, data: Dict[str, Any]) -> Optional[StrategySignal]:
        """Generate signal based on RSI."""
        
        # Add price to history
        self._price_history.append(float(price))
        if len(self._price_history) < self.rsi_period + 1:
            return None
        
        # Calculate RSI
        prices = pd.Series(self._price_history[-self.rsi_period-1:])
        rsi = self.indicators.rsi(prices, self.rsi_period)
        
        if len(rsi) == 0:
            return None
        
        current_rsi = rsi.iloc[-1]
        
        # Generate signals
        if current_rsi < self.oversold:
            return StrategySignal(
                signal_type=SignalType.BUY,
                symbol=symbol,
                strength=1.0 - (current_rsi / self.oversold),
                price=price,
                metadata={'rsi': float(current_rsi)}
            )
        elif current_rsi > self.overbought:
            return StrategySignal(
                signal_type=SignalType.SELL,
                symbol=symbol,
                strength=(current_rsi - self.overbought) / (100 - self.overbought),
                price=price,
                metadata={'rsi': float(current_rsi)}
            )
        
        return None
    
    def on_signal(self, signal: StrategySignal) -> Optional[StrategySignal]:
        """Process signal."""
        return signal if self.should_execute(signal) else None