I need to create an EA for MT4 to manage my trade after I open it. The EA will be based on a custom indicator. The indicator paint an arrow (up or down) I need the EA to move the stop to the low or high of the bar where the first arrow appears after the trade is open. If a new arrow appeared the EA will repeat the process.

Important Notes:
1- The indicator print arrow up/down intra-bar i.e. before the bar close. The EA should be "wise enough" to act on the signal only after the current bar close moving the stop to the low of the bar if there is an open long trade and there is an arrow after the bar close and moving the stop to the high of the bar if there is an open short trade and there is an up arrow after the bar close..
2- The trade will have an initial stop loss and might have a profit target. The EA should act moving the stop according to the rules regardless of wether the trade have a profit target or not and overwriting the current stop loss.
3- The EA should be wise enough also to act only if there is an open trade long or short, if there is no trade the EA shouold do nothing.