//@version=6
indicator("Workshop 02 Trend", overlay=true)
length = input.int(20, "Prior bars", minval=2)
smooth = input.int(50, "Trend average", minval=2)
boundary = ta.highest(high, length)[1]
average = ta.sma(close, smooth)
ready = bar_index >= math.max(length, smooth)
candidate = close > boundary and close > average
signal = ready and candidate and barstate.isconfirmed
plot(boundary, "Prior high", color=color.gray)
plot(average, "Trend average", color=color.blue)
plotshape(signal, "Qualified close", shape.triangleup,
    location.belowbar, color=color.green, size=size.tiny)
alertcondition(signal, "Qualified close",
    "Workshop trend condition on {{ticker}} {{interval}}")