//@version=6
indicator("Simple Trend Painter", overlay = true)

// 1. A setting you can change
length = input.int(20, "Average length", minval = 1)

// 2. The average closing price of the last candles
average = ta.sma(close, length)

// 3. A yes/no question: is price above the average?
isAbove = close > average

// 4. Paint every candle: green if yes, red if no
barcolor(isAbove ? color.green : color.red)

// 5. Draw the average as a blue line
plot(average, "Average", color.blue, 2)

// 6. Find unusually busy candles (volume spike)
avgVolume = ta.sma(volume, 20)
bigVolume = volume > avgVolume * 2
plotshape(bigVolume, "Big volume", shape.circle, location.abovebar, color.orange)

// 7. Alert when price crosses the average
crossed = ta.cross(close, average)
alertcondition(crossed, "Price crossed average", "{{ticker}} crossed its average")