//@version=5
indicator("Sunny Bands", shorttitle="SunnyB", overlay=true, format=format.price, precision=2)

// Input parameters matching Python class
length = input.int(50, "DMA Length", minval=1)
atr_multiplier = input.float(1.5, "ATR Multiplier", minval=0.1, step=0.1)
smooth_factor = input.int(2, "Smoothing Factor", minval=1)

// Double EMA (DMA) calculation matching Python implementation
ema1 = ta.ema(close, length)
dma = ta.ema(ema1, smooth_factor)

// ATR calculation equivalent to Python version
atr = ta.atr(length)

// Calculate bands
upper_band = dma + (atr * atr_multiplier)
lower_band = dma - (atr * atr_multiplier)

// Signal detection using crossovers
bullish = ta.crossover(close, lower_band)
bearish = ta.crossunder(close, upper_band)

// Store plot references for fill
dma_plot = plot(dma, "DMA", color=color.new(#009688, 0), linewidth=2)
upper_plot = plot(upper_band, "Upper Band", color=color.new(#FF5252, 0), linewidth=2)
lower_plot = plot(lower_band, "Lower Band", color=color.new(#4CAF50, 0), linewidth=2)

// Correct fill using plot references
fill(upper_plot, lower_plot, color.new(#673AB7, 90), "Band Area")

// Signal markers
plotshape(
    series=bullish,
    title="Bullish Signal",
    style=shape.triangleup,
    location=location.belowbar,
    color=color.green,
    size=size.small
)

plotshape(
    series=bearish,
    title="Bearish Signal",
    style=shape.triangledown,
    location=location.abovebar,
    color=color.red,
    size=size.small
)

// Alerts equivalent to get_signals() method
alertcondition(bullish, title="Bullish Signal Detected", message="Sunny Bands: Bullish crossover of lower band")
alertcondition(bearish, title="Bearish Signal Detected", message="Sunny Bands: Bearish crossunder of upper band")