//@version=6
strategy("HMA Strat", shorttitle="HMAstrat", overlay=true, default_qty_type=strategy.percent_of_equity, default_qty_value=1)

// === INPUTS ===
length = input.int(24, minval=1, title="HMA Length")
src = input.source(hl2, "Source")
showSignals = input.bool(true, "Show Buy/Sell Signals")

// === FUNCTIONS ===
hma(_src, _length) =>
    wma1 = ta.wma(_src, _length)
    wma2 = ta.wma(_src, _length / 2)
    rawHMA = 2 * wma2 - wma1
    ta.wma(rawHMA, math.round(math.sqrt(_length)))

hma3(_src, _length) =>
    p = _length / 2
    ta.wma(ta.wma(close, p / 3) * 3 - ta.wma(close, p / 2) - ta.wma(close, p), p)

// === HMA CALCULATIONS ===
a = hma(src, length)
b = hma3(src, length)

// === COLOR LOGIC ===
isBull = b > a
colorLine = isBull ? #00ffdd : #80010a
fillColor = color.new(colorLine, 80)

// === PLOTTING ===
p1 = plot(a, color=colorLine, linewidth=1)
p2 = plot(b, color=colorLine, linewidth=1)
fill(p1, p2, color=fillColor)

// === SIGNALS ===
crossUp = b > a and b[1] < a[1]
crossDown = a > b and a[1] < b[1]

plotshape(showSignals and crossUp, title="Buy Signal", location=location.belowbar, style=shape.labelup, size=size.tiny, color=color.green, text="Buy")
plotshape(showSignals and crossDown, title="Sell Signal", location=location.abovebar, style=shape.labeldown, size=size.tiny, color=color.red, text="Sell")

// === STRATEGY LOGIC ===
// Close opposite position before opening a new one
if crossUp
    strategy.close("Short")
    strategy.entry("Long", strategy.long)

if crossDown
    strategy.close("Long")
    strategy.entry("Short", strategy.short)