convert indicator to expert advice

I have a custom indicator which I want to convert it to EA that convert these alerts into orders as follows "

@@ when a buy signals comes, it closes the sell order and opens a buy order.

@@ when a sell signal comes , it closes the buy order and open a sell order.

@@when it cross "0" the order should open

depending on these two rules above :

@@ the the maximum opened orders at the same time is always only one trade.

@@ there is always a trade opened.

@@ I have to be able to set a default lot size to the orders.

note : when the ea is launched it must check if there is order opened or not, to make sure not to open more the one order at the same direction.

## what I need is to convert the code itself from an indicator code to EA code ( the use of icustom function is not allowed ) #

C Programming Metatrader

Project ID: #6761765

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