// Licensed under the Apache License, Version 2.0
// © mihakralj
//@version=6
indicator("Aroon Oscillator", "AROONOSC", overlay=false)

//@function Calculates Aroon Oscillator (Aroon Up - Aroon Down)
//@param period Number of bars used in the calculation
//@returns Aroon Oscillator value ranging from -100 to +100
aroonosc(simple int period) =>
    if period <= 0
        runtime.error("Period must be greater than 0")
    
    float highest_pos = ta.highestbars(high, period)
    float lowest_pos = ta.lowestbars(low, period)
    
    float aroon_up = 100 * (period + highest_pos) / period
    float aroon_down = 100 * (period + lowest_pos) / period
    
    float oscillator = aroon_up - aroon_down
    oscillator

// ---------- Main loop ----------

// Inputs
i_period = input.int(25, "Period", minval=1, tooltip="Number of bars used in the calculation")

// Calculation
oscillator = aroonosc(i_period)

// Plot
plot(oscillator, "Aroon Oscillator", color=color.yellow, linewidth=2)
hline(0, "Zero Line", color=color.gray, linestyle=hline.style_solid)
hline(50, "Upper Level", color=color.gray, linestyle=hline.style_dashed)
hline(-50, "Lower Level", color=color.gray, linestyle=hline.style_dashed)

// Color fill for positive/negative regions
bgcolor(oscillator > 0 ? color.new(color.green, 90) : color.new(color.red, 90), title="Background")

// Alert conditions
alertcondition(ta.crossover(oscillator, 0), "Bullish Crossover", "Aroon Oscillator crossed above zero on {{ticker}}")
alertcondition(ta.crossunder(oscillator, 0), "Bearish Crossover", "Aroon Oscillator crossed below zero on {{ticker}}")
alertcondition(oscillator > 70, "Strong Uptrend", "Strong uptrend detected on {{ticker}} (Oscillator > 70)")
alertcondition(oscillator < -70, "Strong Downtrend", "Strong downtrend detected on {{ticker}} (Oscillator < -70)")