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// Input Groups
var string apz_settings = "════════ APZ Settings ════════"
var string visual_settings = "════════ Visualization Settings ════════"

// Descriptions for inputs (Tooltips)
tooltip_apz_length = "Length of the APZ calculation period. Higher values create smoother signals but respond slower to price changes."
tooltip_threshold = "Multiplier for volatility bands. Higher values create wider bands and generate fewer signals."
tooltip_smooth = "Smoothing period for the typical price. Higher values reduce noise but increase lag."
tooltip_bar_coloring = "Enable or disable bar coloring based on trend direction."

// APZ Settings
length = input.int(21, "APZ Length", minval=1, group=apz_settings, tooltip=tooltip_apz_length)
threshold = input.float(2.0, "Threshold", minval=0.1, step=0.1, group=apz_settings, tooltip=tooltip_threshold)
smooth = input.int(5, "Smoothing", minval=1, group=apz_settings, tooltip=tooltip_smooth)

// Visualization Settings
bullcolor = input.color(#00ffaa, "Bullish Color", group=visual_settings)
bearcolor = input.color(#ff0000, "Bearish Color", group=visual_settings)
bar = input.bool(false, "Color Bars?", group=visual_settings, tooltip=tooltip_bar_coloring)

// ╔════════════════════════════════╗ //
// ║ APZ CALCULATIONS ║ //
// ╚════════════════════════════════╝ //

// Price and volatility calculations
float typical = hlc3
float volatility = ta.ema(math.abs(typical - typical[1]), length)
float upperBand = ta.ema(typical, smooth) + threshold * volatility
float lowerBand = ta.ema(typical, smooth) - threshold * volatility

// Trend Detection and APZ Calculation
float trend = 0
trend := typical > upperBand[1] ? 1 : typical < lowerBand[1] ? -1 : nz(trend[1])

// ╔════════════════════════════════╗ //
// ║ VISUALIZATION ║ //
// ╚════════════════════════════════╝ //

// Bullish/Bearish Trend
l1 = plot(1, "Bullish Trend", display=display.none, color=color.new(bullcolor, 0))
l2 = plot(-1, "Bearish Trend", display=display.none, color=color.new(bearcolor, 30))

// Neutral Line
hline(0, color=color.new(color.white, 50), title="Zero Line")

// APZ Trend Plot
z = plot(trend, "APZ Trend", trend > 0 ? bullcolor : bearcolor, linewidth=4, style=plot.style_stepline_diamond)
mid = plot(0, color=color.new(color.white, 50), display=display.none)

// Fill between trend and zero line
fill(z, mid,
trend > 0 ? trend : 0,
trend > 0 ? 0 : trend,
trend > 0 ? color.new(bullcolor, 10) : na,
trend > 0 ? na : color.new(bearcolor, 10))

// Signal Markers
plotshape(ta.crossover(trend, 0),
location = location.belowbar,
style = shape.triangleup,
size = size.tiny,
text = "⤻",
textcolor = chart.fg_color,
color = bullcolor,
title = "Mean Reversion Up",
force_overlay = true
)

plotshape(ta.crossunder(trend, 0),
location = location.abovebar,
style = shape.xcross,
size = size.tiny,
text = "↷",
textcolor = chart.fg_color,
color = bearcolor,
title = "Mean Reversion Down",
force_overlay = true
)

barcolor(bar ? trend > 0 ? bullcolor : bearcolor : na)