Create an indicator based on two indicators - experienced coder

Indikator named „Valar“ consists of two indicators.

One determines the trend (long/short. Its a line based indicator) , the second one triggers the entry.

In a second step , the indicator is part of an expert advisor so i need the mq4 file.

And i need a really experienced coder with clean code

There are three possible signals which should be graphically highlighted differently and the code should have them as different signals in order to make an ea coding more simple.

I need a dropdown menu where i can select : Display Signal 1, Signal 2 , Signal 3 or any combination.
It should also contain an email alert function which includes the type of signal and where it occures/the price

Signal 1:

Long: trend indicator is long . Second indicator triggers the first up arrow since trend indicator has switched to long -> highlight with signal 1 arrow up

Short: trend indicator is short, second indicator triggerst he first down arrow since trend indator has switched short -> highlight with signal 1 arrow down

No further signals until trend indicator changes color

Signal 2:

Long: trend indicator is long, second indicator triggers a long signal and the signal candle touches the line of trend indicator

Short: trend indicator is short, second indicator triggers a short signal and the signal candle touches the line of trend indicator

No further signals until trend indicator changes color

Signal 3:

Short: first signal of second indicator which is below the signal line of indicator 1

No further signals until trend indicator changes color