//+------------------------------------------------------------------+
//|                                                   MAEA_Indicator.mq5 |
//|                                          Moving Average EA       |
//|                     Visual indicator for EMA zone breakout        |
//+------------------------------------------------------------------+
#property copyright "MAEA"
#property link      ""
#property version   "1.00"
#property strict

#property indicator_chart_window
#property indicator_buffers 3
#property indicator_plots   3

#property indicator_label1  "EMA High"
#property indicator_type1   DRAW_LINE
#property indicator_color1  clrLightBlue
#property indicator_style1  STYLE_SOLID
#property indicator_width1  2

#property indicator_label2  "EMA Low"
#property indicator_type2   DRAW_LINE
#property indicator_color2  clrOrange
#property indicator_style2  STYLE_SOLID
#property indicator_width2  2

#property indicator_label3  "EMA Zone"
#property indicator_type3   DRAW_FILLING
#property indicator_color3  clrYellow
#property indicator_style3  STYLE_SOLID
#property indicator_width3  1

input int      EMAPeriod = 30;
input int      EMAShift = 0;

int handleEMAHigh;
int handleEMALow;

double BufferEMAHigh[];
double BufferEMALow[];
double BufferZone[];

//+------------------------------------------------------------------+
//| Custom indicator initialization function                          |
//+------------------------------------------------------------------+
int OnInit() {
    ArraySetAsSeries(BufferEMAHigh, true);
    ArraySetAsSeries(BufferEMALow, true);
    ArraySetAsSeries(BufferZone, true);
    
    SetIndexBuffer(0, BufferEMAHigh, INDICATOR_DATA);
    SetIndexBuffer(1, BufferEMALow, INDICATOR_DATA);
    SetIndexBuffer(2, BufferZone, INDICATOR_CALCULATIONS);
    
    ArraySetAsSeries(BufferEMAHigh, true);
    ArraySetAsSeries(BufferEMALow, true);
    ArraySetAsSeries(BufferZone, true);
    
    PlotIndexSetDouble(0, PLOT_EMPTY_VALUE, EMPTY_VALUE);
    PlotIndexSetDouble(1, PLOT_EMPTY_VALUE, EMPTY_VALUE);
    
    PlotIndexSetInteger(0, PLOT_DRAW_BEGIN, EMAPeriod + EMAShift);
    PlotIndexSetInteger(1, PLOT_DRAW_BEGIN, EMAPeriod + EMAShift);
    PlotIndexSetInteger(2, PLOT_DRAW_BEGIN, EMAPeriod + EMAShift);
    
    handleEMAHigh = iMA(_Symbol, PERIOD_CURRENT, EMAPeriod, EMAShift, MODE_EMA, PRICE_HIGH);
    handleEMALow = iMA(_Symbol, PERIOD_CURRENT, EMAPeriod, EMAShift, MODE_EMA, PRICE_LOW);
    
    if(handleEMAHigh == INVALID_HANDLE || handleEMALow == INVALID_HANDLE) {
        Print("Failed to create EMA handles");
        return INIT_FAILED;
    }
    
    return INIT_SUCCEEDED;
}

//+------------------------------------------------------------------+
//| Custom indicator deinitialization function                        |
//+------------------------------------------------------------------+
void OnDeinit(const int reason) {
    IndicatorRelease(handleEMAHigh);
    IndicatorRelease(handleEMALow);
}

//+------------------------------------------------------------------+
//| Custom indicator iteration function                               |
//+------------------------------------------------------------------+
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[]) {
    
    if(rates_total < EMAPeriod + EMAShift) return 0;
    
    int copied = CopyBuffer(handleEMAHigh, 0, 0, rates_total, BufferEMAHigh);
    if(copied <= 0) return 0;
    
    copied = CopyBuffer(handleEMALow, 0, 0, rates_total, BufferEMALow);
    if(copied <= 0) return 0;
    
    return rates_total;
}
//+------------------------------------------------------------------+