EA Based on Linear Regression Curve, with Offsets

I would like the ability to input a period length for the calculation, as well as an offset modifier, to adjust the equation with which the linear regression curve is calculated.

The EA will create buy and sell orders based on offsets of the linear regression curve.

To clarify, I do not want the line to be of a constant slope, where the slope is calculated only once for the entire line. I want the curve to be calculated at ever bar, so that it moves with every bar.

Because I want the calculation to produce a curve, and I want the data to be extrapolated from left to right, for the x parameter, the i counter runs from 0 to the period, and for the y parameter counts down in the reference bracket, Close[Period-i]. I want this calculation however to be done for every bar on the chart, which it seems requires the Bars and Indicator Counted Function. MQL4 is kind of tricky.

For a buy, if the 2 day and 3 day negative offsets are above the 2 day and 3 day positive offsets, and the current price is above the weighted moving average, the bot will buy that currency pair.

I would also like to be able to add more buffers to the buy and sell evaluation if possible.