Keeping it simple:
1. Uptrend identified after a ranging phase
b) price above 20 and 50d MA,
c) 50 d MA pointing higher
2. Trend line touched and respected 4 times
3. Relatively strong bullish engulfing with abt 1.5 ATR size
4. Value zone has been reached
Long until price closes below trendline, sloss 1 ATR below trendline or 1 ATR below bullish...