Build a **bullish scalping strategy** for **XAUUSD** using **1-minute to 15-minute timeframes**.

🔹 **Trend Filter**  
- Only take long trades when **EMA 50 is above EMA 200** on the **15-minute timeframe** (higher timeframe filter).
- Only consider entries on the **current timeframe** (1m, 5m, or 15m — whichever is selected).

🔹 **Entry Conditions (Long Only)**  
- Wait for a **pullback** in price toward the **EMA 50** on the current chart.  
- Require **RSI (14)** to cross **upward above 30**, indicating oversold conditions resolving.  
- Confirm entry with a **bullish candlestick pattern**, such as a **bullish engulfing** or **hammer**, within 2 candles of the pullback.

🔹 **Stop Loss**  
- Place stop loss **just below the most recent swing low**, using a 10-bar lookback.  
- If the swing low is too close (e.g., <10 pips), set a fallback stop loss at **0.2% below entry**.

🔹 **Take Profit**  
- Set a take profit at **2× the risk** (i.e. 2R target).  
- Include a **trailing stop**:  
  - Once price moves 1R in profit, move stop to breakeven.  
    - After that, trail the stop by 0.5R behind recent higher lows.

    🔹 **Risk Management**  
    - Risk **1% of account equity per trade**.  
    - Only one active trade at a time.  
    - Avoid trades when **spread > 3 pips** or **ATR(14) is too low** (indicating low volatility).  
    - Maximum 3 trades per session (optional constraint).

    🔹 **Backtest & Output**  
    - Run backtest on 15m and 5m timeframes separately and show:  
      - Total trades  
        - Win rate  
          - Average risk-reward ratio  
            - Max drawdown  
              - Profit factor  
                - Equity curve  

                Also, output the **code or pseudocode** used to generate the strategy, and allow for parameter adjustment (e.g. EMA lengths, RSI threshold, trailing stop parameters).