///////////////////////////////////////////////////////
// 
// SaherElm IT Center ADX Oscillator
// ---------------------------------------------
// saherelm implementation of above oscillator ...
//
// Maintainer:
// ------------
// Hadi Khazaee Asl (hadi_khazaee_asl@yahoo.com)
// 
//////////////////////////////////////////////////////
//
// Global Properties ...
#property copyright "Copyright 2023, SaherElm IT Center"
#property link "https://saherelm.ir"
#property version "1.00"
#property description "SaherElm ADX Oscillator"
#property strict

//
// START Inputs ...
//
input int length = 7; // Averaging Length
//
// END Inputs ...
//

//
// START Global Definitions: Variables, Properties and etc ...
//
//
#property indicator_chart_window

//
// #property indicator_buffers    3

//
// Declare Buffers ...
//
datetime startTime;
double lHigh;
double lLow;

//
datetime highTimes[];

//
datetime lowTimes[];
//
// END Global Definitions: Variables, Properties and etc ...
//

//
// Start Event Handlers ...
// 
//
// Initialization ...
int OnInit() {
    //
    // Initialize what we want ...

    //
    // Validating Input Parameters ...
    if (length < 0) {
        return INIT_PARAMETERS_INCORRECT;
    }

    //
    // initialization done ...
    return INIT_SUCCEEDED;
}

//
// Do Calculation ...
int OnCalculate(
    const int rates_total,
    const int prev_calculated,
    const datetime &time[],
    const double &open[],
    const double &high[],
    const double &low[],
    const double &close[],
    const long &tick_volume[],
    const long &volume[],
    const int &spread[]
) {
    //
    // this counts Available Bars ...
    int limit;

    //
    // because in some cases we may have more than one input for 
    // calculation and we must prevent any calculation
    // untill we pass the biggest input length, here we get max Input length
    // and then wait until pass it ...
    int maxLength = MathMax(0, length);

    //
    // input variable, we return 0 means nothing passed ...
    if (rates_total < maxLength) {
      return 0;
    }
   
    //
    // found which candles calculated before ...
    limit = (prev_calculated == 0) ? rates_total - maxLength - 1 : rates_total - prev_calculated + 1;

    //
    // this is the main loop of calculations, for each bar index ...
    for (int i = limit - 1; i >= 0; i--) {
        //
        // Start Calculation here ...
        // i is bar_index ... 
        
        //
        // Calculate Long TP ...
        CalculateBuffers(i);
    }

    //
    return rates_total;
}
//
// END Event Handlers ...
// 

//
// START Functions ...
//
void CalculateBuffers(
    const int bar_index
) {
    //
    // Calculate Buffers ...
    //
    int startBarIndex = iBarShift(
        _Symbol,
        _Period,
        startTime
    );

    //
    datetime barTime = iTime(
        _Symbol,
        _Period,
        bar_index
    );

    //
    if (startTime == 0) {
        //
        startTime = barTime;
        return;
    }

    //
    if (
        startTime > 0
        && startBarIndex - bar_index == length
    ) {
        //
        int hhIdx = iHighest(
            _Symbol,
            _Period,
            MODE_HIGH,
            length,
            bar_index
        );
        datetime hhTime = iTime(
            _Symbol,
            _Period,
            hhIdx
        );
        double hh = iHigh(
            _Symbol,
            _Period,
            hhIdx
        );

        //
        int hhSize = ArraySize(highTimes);
        datetime tempTimes[];
        ArrayResize(
            tempTimes,
            hhSize
        );
        ArrayCopy(
            tempTimes,
            highTimes
        );
        ArrayResize(
            highTimes,
            hhSize + 1
        );
        highTimes[0] = hhTime;
        ArrayCopy(
            highTimes,
            tempTimes,
            1
        );

        //
        int llIdx = iLowest(
            _Symbol,
            _Period,
            MODE_LOW,
            length,
            bar_index
        ); 
        datetime llTime = iTime(
            _Symbol,
            _Period,
            llIdx
        );
        double ll = iLow(
            _Symbol,
            _Period,
            llIdx
        );

        //
        int llSize = ArraySize(lowTimes);
        ArrayFree(tempTimes);
        ArrayResize(
            tempTimes,
            llSize
        );
        ArrayCopy(
            tempTimes,
            lowTimes
        );
        ArrayResize(
            lowTimes,
            llSize + 1
        );
        lowTimes[0] = llTime;
        ArrayCopy(
            lowTimes,
            tempTimes,
            1
        );

        //
        startTime = 0;
        ArrayFree(tempTimes);
    }
}
//
// END Functions ...
//