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

//@function Calculates Aroon Up and Down values
//@param period Number of bars used in the calculation
//@returns tuple of Aroon Up and Aroon Down values
aroon(simple int period = 25) =>
    if period <= 0
        runtime.error("Period must be greater than 0")

    // Find highest high and lowest low positions
    float highest_pos = ta.highestbars(high, period)
    float lowest_pos = ta.lowestbars(low, period)

    // Calculate Aroon values
    float aroon_up = 100 * (period + highest_pos) / period
    float aroon_down = 100 * (period + lowest_pos) / period

    [aroon_up, aroon_down]

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

// Calculate Aroon
[aroon_up, aroon_down] = aroon(i_period)

// Plot
plot(aroon_up, "Aroon Up", color=color.yellow, linewidth=2)
plot(aroon_down, "Aroon Down", color=color.yellow, linewidth=2)
hline(50, "Mid Level", color.gray)
hline(70, "Upper Level", color.gray)
hline(30, "Lower Level", color.gray)

// Alert conditions
alertcondition(ta.crossover(aroon_up, aroon_down), "Aroon Up crosses above Down", "Bullish crossover on {{ticker}}")
alertcondition(ta.crossunder(aroon_up, aroon_down), "Aroon Down crosses above Up", "Bearish crossover on {{ticker}}")
alertcondition(aroon_up > 70 and aroon_down < 30, "Strong uptrend", "Strong uptrend detected on {{ticker}}")
alertcondition(aroon_down > 70 and aroon_up < 30, "Strong downtrend", "Strong downtrend detected on {{ticker}}")