Indicator -Trend Alert

Indicator -Bollinger Band

Chart Button  Require - TREND = BUY or SELL

Default Bollinger band parameters - 200 MA - 3 Standard Deviation - (Option to change as per my need

Alert - Text/ Push notifiation/ Email



Theory
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On this indicator I want a on chart button   "Trend Direction "Option to pick Buy or Sell. I will determine if I am trading Buy or Sell and will choose which signal I want generate

If I have decided I am only trading Buy trades - then indicator should only send me alert when price touch bottom bollinger band.
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If I have decided I am only trading Sell Trade - Then indicator should only send me alert when price touch Top bollinger band.
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Important
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Indicator should only send ONE ALERT as per this - E.g If i had chosen buy and price touch bottom bollinger band - Signal generated. NOw the next signal
should only generated if price has touch opposite bollinger band (i.e in this case top bollinger band) and then re- visited bottom bollinger band after 
touching top bollinger band this is where I should get a Next signal. 

I would like a Arrow/ or any other symbol place where price has generated signal.