TRENDLINE SCRIPT

Is it possible to create a script

1. moves a trend line with a set moving average.

2 the trend line  should be one candle ahead of the last candle and stretch back for 4 candles

3 the trend line properties require three names depending on its orientation  trending up (BUY1) / trending down (SELL1) / flat (NOTRADE) ( think this is the hard bit)

See picture.