///////////////////////////////////////////////////////
// 
// SaherElm IT Center MA Indicator
// ---------------------------------------------
// saherelm implementation of above indicator ...
// this indicator uses two ma line:
//  - fast ma;
//  - slow ma;
//
// 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 MA Indicator"
#property strict

//
// START Inputs ...
//
//
// Fast MA ...
input int maLength = 20; // MA Length
input int maShift = 0; // MA Shift
input ENUM_MA_METHOD maMethod = MODE_EMA; // MA Method
input ENUM_APPLIED_PRICE maAppliedPrice = PRICE_CLOSE; // MA Applied Price

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

//
#property indicator_buffers 1

//
#property indicator_plots 1

//
// Start Define Indicator Buffer Styles ...
//
//
// Fast Ma Buffer ...
#property indicator_label1  "Ma"
#property indicator_type1   DRAW_LINE
#property indicator_color1  clrYellow
#property indicator_style1  STYLE_DOT
#property indicator_width1  2

//
// End Define Indicator Buffer Styles ...
//

//
// Buffers ...
#define maBufferIndex 0

double maBuffer[];
//
// END Global Definitions: Variables, Properties and etc ...
//

//
// Start Event Handlers ...
// 
//
// Initialization ...
int OnInit() {
    //
    // Initialize what we want ...
    if (maLength <= 0) {
        return INIT_PARAMETERS_INCORRECT;    
    }

    //
    // Start Set Index Buffers ...
    //
    //
    // Ma ...
    SetIndexBuffer(maBufferIndex, maBuffer);
    SetIndexDrawBegin(maBufferIndex, maLength + 1);
    //
    // End Set Index Buffers ...
    //

    //
    return INIT_SUCCEEDED;
}

//
// Calculating what we want ...
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, maLength);

    //
    // 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 Ma ...
        CalculateMa(i);
    }

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

//
// START Functions ...
//
//
// Calculating Ma ...
void CalculateMa(
    const int &bar_index
) {
    //
    // Calculating Fast Ma ...
    double ma = iMA(
        _Symbol,
        _Period,
        maLength,
        maShift,
        maMethod,
        maAppliedPrice,
        bar_index
    );
    
    //
    maBuffer[bar_index] = ma;
}
//
// END Functions ...
//