//+------------------------------------------------------------------+
//|                                     EMA-alert-Symbol-Period.mq4  |
//|                      Copyright © 2007, MetaQuotes Software Corp. |
//|                                        http://www.metaquotes.net |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2007, MetaQuotes Software Corp."
#property link "http://www.metaquotes.net"

#property indicator_chart_window
#property indicator_buffers 1

//MODE_SMA 0 Simple moving average, 
//MODE_EMA 1 Exponential moving average, 
//MODE_SMMA 2 Smoothed moving average, 
//MODE_LWMA 3 Linear weighted moving average. 

//PRICE_CLOSE 0 Close price. 
//PRICE_OPEN 1 Open price. 
//PRICE_HIGH 2 High price. 
//PRICE_LOW 3 Low price. 
//PRICE_MEDIAN 4 Median price, (high+low)/2. 
//PRICE_TYPICAL 5 Typical price, (high+low+close)/3. 
//PRICE_WEIGHTED 6 Weighted close price, (high+low+close+close)/4. 


//---- input parameters
extern int ma_period = 24;
extern int ma_mode   = 0;
extern int ma_price  = 0;
extern int ma_shift  = 0;
//---- buffers
double ExtMapBuffer1[];
extern bool Box_Alert    =true;
extern bool Sound_Alert  =true;
extern string Sound_File = "timeout.wav";   //<-- i've changed this to "timeout.wav" yet it still plays alert.wav!!!?????
extern bool Email_Alert  =false;
extern int pip_distance  = 100;
datetime lastimealert;
//----
double ema_value;
  
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//---- indicators
  
    SetIndexBuffer(0, ExtMapBuffer1);

//---- name for DataWindow and indicator subwindow label
  
//----
   
    return(0);
  }
//+------------------------------------------------------------------+
//| Custor indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
  {
//----
    return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start()
  {
    int limit;
    int counted_bars = IndicatorCounted();
//---- check for possible errors
    if(counted_bars < 0) 
        return(-1);
//---- last counted bar will be recounted
    if(counted_bars > 0) 
        counted_bars--;
    limit = Bars - counted_bars;
//----
   
   string MA;
   
   
    for(int i = 0; i < limit; i++)
      {
       ema_value= iMA(NULL,0,ma_period,ma_shift,ma_mode,ma_price,i);
       
       if(ma_mode==0){MA="SMA";}
       if(ma_mode==1){MA="EMA";}
       if(ma_mode==2){MA="SMMA";}
       if(ma_mode==3){MA="LWMA";}
        //----
        ExtMapBuffer1[i] = ema_value-Ask ;
        if(MathAbs(ema_value-Bid)<=pip_distance*Point&& lastimealert!= Time[0] )
            {
            
            if(Box_Alert) Alert(Symbol()," M",Period()," Price is within ",pip_distance," pips of ",ma_period," Period "+MA+"");
            if(Sound_Alert) PlaySound(Sound_File);
            if(Email_Alert) SendMail("Price Alert on "+Symbol()+" M"+Period(),Symbol()+" M"+Period()+" Price is within "+pip_distance+" pips of "+ma_period+" Period "+MA+"");
            lastimealert= Time[0];
            }
            
        }


//----
    return(0);
  }
//+------------------------------------------------------------------+