-- Id: 14325
-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=27761

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-- The indicator corresponds to the Parabolic indicator in MetaTrader.
-- The formula is described in the Kaufman "Trading Systems and Methods" chapter 5 "Trend Systems" (page 98-99)

-- Indicator profile initialization routine
-- Defines indicator profile properties and indicator parameters
function Init()
    indicator:name("Parabolic SAR Channel");
    indicator:description("Helps to define the direction of the prevailing trend and the moment to close positions opened during the reversal.");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Indicator);
	indicator.parameters:addGroup("Calculation");
    indicator.parameters:addDouble("Step", "Step", "", 0.02, 0.001, 1);
    indicator.parameters:addDouble("Max", "Max", "", 0.2, 0.001, 10);
	indicator.parameters:addBoolean("OVERLAY", "Show PSAR", "", false);
	indicator.parameters:addBoolean("Channel", "Show Channel", "", true);
	indicator.parameters:addGroup("PSAR Style");
    indicator.parameters:addColor("clrUp", "Up SAR Color", "", core.rgb(0, 0, 255));
    indicator.parameters:addColor("clrDown", "Down SAR Color", "", core.rgb(0, 0, 255));
	indicator.parameters:addInteger("width", "Line width", "", 1, 1, 5);
	
	indicator.parameters:addGroup("Channel Up Style");
	indicator.parameters:addColor("ChannelUp", "Up  Channel Line Color", "", core.rgb(255, 0, 0));
	indicator.parameters:addInteger("width1", "Line width", "", 1, 1, 5);
    indicator.parameters:addInteger("style1", "Line style", "", core.LINE_SOLID);
    indicator.parameters:setFlag("style1", core.FLAG_LINE_STYLE);
	indicator.parameters:addGroup("Channel Down Style");	
    indicator.parameters:addColor("ChannelDown", "Down Channel Line Color", "", core.rgb(0, 255, 0));
	indicator.parameters:addInteger("width2", "Line width", "", 1, 1, 5);
    indicator.parameters:addInteger("style2", "Line style", "", core.LINE_SOLID);
    indicator.parameters:setFlag("style2", core.FLAG_LINE_STYLE);
	
	indicator.parameters:addGroup("Mode");  
	indicator.parameters:addString("Live", "End of Turn / Live", "", "Live");
    indicator.parameters:addStringAlternative("Live", "End of Turn", "", "End of Turn");
	indicator.parameters:addStringAlternative("Live", "Live", "", "Live");   
	
		
	indicator.parameters:addGroup("Alert Style");
    indicator.parameters:addColor("UpTrendColor", "Up Trend Color", "", core.rgb(0, 0, 255));
	indicator.parameters:addColor("DownTrendColor", "Down Trend Color", "", core.rgb(0, 0, 255));
	indicator.parameters:addInteger("Size", "Label Size", "", 10, 1 , 100);
	
	indicator.parameters:addGroup("Alerts Sound");   
    indicator.parameters:addBoolean("PlaySound", "Play Sound", "", true);	
    indicator.parameters:addBoolean("RecurrentSound", "Recurrent Sound", "", false);
	indicator.parameters:addBoolean("ShowAlert", "Show Alert", "", true);
	
	indicator.parameters:addGroup("Alerts Email");   
	indicator.parameters:addBoolean("SendEmail", "Send Email", "", true);
    indicator.parameters:addString("Email", "Email", "", "");
    indicator.parameters:setFlag("Email", core.FLAG_EMAIL);
	indicator.parameters:addBoolean("Show", "Show Dialog box Alert", "", true);
	indicator.parameters:addBoolean("OnlyOnce", "Alert Once", "Subsequent Alert will be ignored.", false);	
	
	Parameters (1, "Top Line Cross");
	Parameters (2, "Bottom Line Cross")
	
end

function Parameters ( id, Label )
  
  
   indicator.parameters:addGroup(Label .. " Alert");
  
    indicator.parameters:addBoolean("ON"..id , "Show " .. Label .." Alert" , "", true);
   

    indicator.parameters:addFile("Up"..id, Label .. " Cross Over Sound", "", "");
    indicator.parameters:setFlag("Up"..id, core.FLAG_SOUND);
	
	indicator.parameters:addFile("Down"..id, Label .. " Cross Under Sound", "", "");
    indicator.parameters:setFlag("Down"..id, core.FLAG_SOUND);
	
	 indicator.parameters:addString("Label"..id, "Label", "", Label);

end 

local 	Number = 2;

local Up={};
local Down={};
local Label={};
local ON={};
local Size;
local Email;
local SendEmail;
local  RecurrentSound ,SoundFile  ;
local Show;
local Alert;
local PlaySound;
local Live;
local FIRST=true;
local OnlyOnce;
local U={};
local D={};
local UpTrendColor, DownTrendColor;
local OnlyOnceFlag;
local font;
local ShowAlert;

-- Indicator instance initialization routine
-- Processes indicator parameters and creates output streams
-- Parameters block

local first;
local source = nil;
local tradeHigh = nil;
local tradeLow = nil;
local parOp = nil;
local position = nil;
local af = nil;
local Step;
local Max;
local Channel;
-- Streams block
local SAR = nil;
local OUT = nil;
local OVERLAY;
local Top, Bottom;
-- Routine
function Prepare(nameOnly)
    source = instance.source;
    first = source:first() + 1;
    OVERLAY = instance.parameters.OVERLAY;
	Channel = instance.parameters.Channel;
    Step = instance.parameters.Step;
    Max = instance.parameters.Max;
	
	
	OnlyOnceFlag=true;
	FIRST=true;
	OnlyOnce = instance.parameters.OnlyOnce;
	ShowAlert = instance.parameters.ShowAlert;
	Show = instance.parameters.Show;
	Live = instance.parameters.Live;
	UpTrendColor = instance.parameters.UpTrendColor;
	DownTrendColor = instance.parameters.DownTrendColor;
	Size=instance.parameters.Size;

    local name = profile:id() .. "(" .. source:name() .. "," .. Step .. "," .. Max .. ")";
    instance:name(name);
    if nameOnly then
        return;
    end
    font = core.host:execute("createFont", "Wingdings", Size, false, false);

    tradeHigh = instance:addInternalStream(0, 0);
    tradeLow = instance:addInternalStream(0, 0);
    parOp = instance:addInternalStream(0, 0);
    position = instance:addInternalStream(0, 0);
    af = instance:addInternalStream(0, 0);
    SAR = instance:addInternalStream(first, 0);
	
	if Channel then
	Top = instance:addStream("Top", core.Line, name .. ".Top", "Top", instance.parameters.ChannelDown, first)
	Top:setWidth(instance.parameters.width1);
    Top:setStyle(instance.parameters.style1);
	Bottom= instance:addStream("Bottom", core.Line, name .. ".Bottom", "Bottom", instance.parameters.ChannelUp, first)
	Bottom:setWidth(instance.parameters.width2);
    Bottom:setStyle(instance.parameters.style2);
	else
	Top = instance:addInternalStream(first, 0);	
	Bottom = instance:addInternalStream(first, 0);	
	end
	
	if OVERLAY then
    OUT = instance:addStream("SAR", core.Dot, name .. ".SAR", "SAR", instance.parameters.clrUp, first)
	OUT:setWidth(instance.parameters.width);		
	else
	OUT = instance:addInternalStream(first, 0);	
	end
	
	Initialization();
		
end

function  Initialization ()
    
	 SendEmail = instance.parameters.SendEmail;
	 
	 local i;
	 for i = 1, Number , 1 do 
	  Label[i]=instance.parameters:getString("Label" .. i);
	  ON[i]=instance.parameters:getBoolean("ON" .. i);
	 end
	 
	 
	 

    if SendEmail then
        Email = instance.parameters.Email;
    else
        Email = nil;
    end
    assert(not(SendEmail) or (SendEmail and Email ~= ""), "E-mail address must be specified");
	
	
	 PlaySound = instance.parameters.PlaySound;
    if PlaySound then
    
	  for i = 1, Number , 1 do 
	  Up[i]=instance.parameters:getString("Up" .. i);
	  Down[i]=instance.parameters:getString("Down" .. i);
	  end
	
    else 
	
	  for i = 1, Number , 1 do 
       Up[i]=nil;
	  Down[i]=nil;
	  end
		
    end
    
        for i = 1, Number , 1 do 
	  assert(not(PlaySound) or (PlaySound and Up[i] ~= "") or (PlaySound and Up[i] ~= ""), "Sound file must be chosen"); 
	 assert(not(PlaySound) or (PlaySound and Down[i] ~= "") or (PlaySound and Down[i] ~= ""), "Sound file must be chosen");
	end
	 
    RecurrentSound = instance.parameters.RecurrentSound;
	
	for i = 1, Number , 1 do 
	U[i] = nil;
	D[i] = nil;	 
	end
		 
end	

-- Indicator calculation routine
function Update(period)
 
    Calculation(period);
 
    core.host:execute ("removeLabel", source:serial(period)); 
   
    if period < first then
	return;
	end
	
    Activate (1, period);
    Activate (2, period);
 
   
 end


function Calculation (period)


    local init = Step;
    local quant = Step;
    local maxVal = Max;
    local lastHighest = 0;
    local lastLowest = 0;
    local high = 0;
    local low = 0;
    local prevHigh = 0;
    local prevLow = 0;
    if period >= first then
        high = source.high[period];
        low = source.low[period];
        prevHigh = source.high[period - 1];
        prevLow = source.low[period - 1];
        if (period == first) then
            tradeHigh[period] = prevHigh;
            tradeLow[period] = prevLow;
            position[period] = -1;
            parOp[period] = prevHigh;
            af[period] = 0;
        else
            parOp[period] = parOp[period - 1];
            position[period] = position[period - 1];
            tradeHigh[period] = tradeHigh[period - 1];
            tradeLow[period] = tradeLow[period - 1];
            af[period] = af[period - 1];
        end
        lastHighest = tradeHigh[period];
        lastLowest = tradeLow[period];
        if high > lastHighest then
            tradeHigh[period] = high;
        end

        if low < lastLowest then
            tradeLow[period] = low;
        end

        if position[period] == 1 then
            if (low < parOp[period]) then
                position[period] = -1;
                SAR[period] = lastHighest;
                tradeHigh[period] = high;
                tradeLow[period] = low;
                af[period] = init;
                parOp[period] = SAR[period] + af[period] * (tradeLow[period] - SAR[period]);
                if (parOp[period] < high) then
                    parOp[period] = high;
                end
                if (parOp[period] < prevHigh) then
                    parOp[period] = prevHigh;
                end
            else
                SAR[period] = parOp[period];
                if (tradeHigh[period] > tradeHigh[period - 1] and af[period] < maxVal) then
                    af[period] = af[period] + quant;
                    if af[period] > maxVal then
                        af[period] = maxVal;
                    end
                end

                parOp[period] = SAR[period] + af[period] * (tradeHigh[period] - SAR[period]);
                if (parOp[period] > low) then
                    parOp[period] = low;
                end
                if (parOp[period] > prevLow) then
                    parOp[period] = prevLow;
                end
            end
        else
            if (high > parOp[period]) then
                position[period] = 1;
                SAR[period] = lastLowest;
                tradeHigh[period] = high;
                tradeLow[period] = low;
                af[period] = init;
                parOp[period] = SAR[period] + af[period] * (tradeHigh[period] - SAR[period]);
                if (parOp[period] > low) then
                    parOp[period] = low;
                end
                if (parOp[period] > prevLow) then
                    parOp[period] = prevLow;
                end
            else
                SAR[period] = parOp[period];
                if (tradeLow[period] < tradeLow[period - 1] and af[period] < maxVal) then
                    af[period] = af[period] + quant;
                    if af[period] > maxVal then
                        af[period] = maxVal;
                    end
                end

                parOp[period] = SAR[period] + af[period] * (tradeLow[period] - SAR[period]);
                if (parOp[period] < high) then
                    parOp[period] = high;
                end
                if (parOp[period] < prevHigh) then
                    parOp[period] = prevHigh;
                end
            end
        end
		
		
		
		
		Top[period] = Top[period-1];
		Bottom[period] = Bottom[period-1];
		
		  OUT[period] = SAR[period];
		  
		  if position[period] == 1 and  position[period-1] == -1 then
		 Top[period] = OUT[period];
		 elseif position[period] == -1 and  position[period-1] == 1 then
		 Bottom[period] = OUT[period];
		 end 
		  
		  
            if OVERLAY then  
				if position[period] == 1 then
				OUT:setColor(period,instance.parameters.clrDown);
				else
				 OUT:setColor(period,instance.parameters.clrUp);   
				end
			end
	end		
end



function ReleaseInstance()
       core.host:execute("deleteFont", font);
end	   

function Activate (id, period)

   local Shift=0;
   

   if Live~= "Live" then
	period=period-1;
	Shift=1;
	end
 
	  if id == 1  and ON[id]  then
	  
	       
			if  source.close[period] > Top[period] 
			and   source.close[period-1] <= Top[period-1] 
			then
			           
						    
             core.host:execute("drawLabel1", source:serial(period), source:date(period),  core.CR_CHART, Top[period], core.CR_CHART, core.H_Center, core.V_Bottom, font, UpTrendColor, "\225");

 						 
						   
			
			 D[id] = nil;
						   
							  if U[id]~=source:serial(period) 
							  and period == source:size()-1-Shift
							  and not FIRST 
							  then
							  OnlyOnceFlag=false;
							  U[id]=source:serial(period);
							  SoundAlert(Up[id]);
							  EmailAlert(  Label[id], " Cross Over", period);
							  SendAlert("Crossed over");  
							        
									Pop(Label[id], " Cross Over " );  	
								    
								 
							  end
			elseif  source.close[period] < Top[period] 
			and   source.close[period-1] >= Top[period-1] 
            then			
			
			            			 
			               core.host:execute("drawLabel1", source:serial(period), source:date(period),  core.CR_CHART, Top[period], core.CR_CHART, core.H_Center, core.V_Top, font, DownTrendColor, "\226");						   
						   
		     U[id] = nil;
		   
			                 if  D[id]~=source:serial(period)
							 and period == source:size()-1-Shift
							 and not FIRST 
							 then
							 OnlyOnceFlag=false;
							 D[id]=source:serial(period);
							 SoundAlert(Down[id]);			 
							 EmailAlert( Label[id] , " Cross Under", period);	
								 
									Pop(Label[id], " Cross Under " );  	
								    SendAlert("Crossed under");
							 
			                  end			   
	         end
			
	  
	 
	   elseif id == 2  and ON[id]  then
	  
	       
			if  source.close[period] > Bottom[period] 
			and   source.close[period-1] <= Bottom[period-1] 
			then
			           
						    
             core.host:execute("drawLabel1", source:serial(period), source:date(period),  core.CR_CHART, Bottom[period], core.CR_CHART, core.H_Center, core.V_Bottom, font, UpTrendColor, "\225");

 						 
						   
			
			 D[id] = nil;
						   
							  if U[id]~=source:serial(period) 
							  and period == source:size()-1-Shift
							  and not FIRST 
							  then
							  OnlyOnceFlag=false;
							  U[id]=source:serial(period);
							  SoundAlert(Up[id]);
							  EmailAlert(  Label[id], " Cross Over", period);
							  SendAlert("Crossed over");  
							        
									Pop(Label[id], " Cross Over " );  	
								    
								 
							  end
			elseif  source.close[period] < Bottom[period] 
			and   source.close[period-1] >= Bottom[period-1] 
            then			
			
			            			 
			               core.host:execute("drawLabel1", source:serial(period), source:date(period),  core.CR_CHART, Bottom[period], core.CR_CHART, core.H_Center, core.V_Top, font, DownTrendColor, "\226");						   
						   
		     U[id] = nil;
		   
			                 if  D[id]~=source:serial(period)
							 and period == source:size()-1-Shift
							 and not FIRST 
							 then
							 OnlyOnceFlag=false;
							 D[id]=source:serial(period);
							 SoundAlert(Down[id]);			 
							 EmailAlert( Label[id] , " Cross Under", period);	
								 
									Pop(Label[id], " Cross Under " );  	
								    SendAlert("Crossed under");
							 
			                  end			   
	         end
			
	  
	 
	  end
	  
		   
        if FIRST then
        FIRST=false;      
        end		

end


function AsyncOperationFinished (cookie, success, message)
end


function Pop(label , note)
  
   if not Show then
   return;
   end
    
   core.host:execute ("prompt", 1, label ,   " ( " .. source:instrument() .. " : " .. source:barSize() .. " ) "  ..   label .. " : " .. note );
 

end


function SendAlert(message)
    if not ShowAlert then
        return;
    end
 
   
  terminal:alertMessage(source:instrument(), source[NOW], message, source:date(NOW));
end

function SoundAlert(Sound)
 if not PlaySound then
 return;
 end

  if OnlyOnce and OnlyOnceFlag== false then
 return;
 end
 
    terminal:alertSound(Sound, RecurrentSound);
end

 


function EmailAlert( label , Subject, period)

if not SendEmail then
return
end

 if OnlyOnce and OnlyOnceFlag== false then
 return;
 end

 
    local date = source:date(period);
	local DATA = core.dateToTable (date);
	
    
   local delim = "\013\010";  
   local Note=  profile:id().. delim.. " Label : " ..label  .. delim .. " Alert : " .. Subject ;   
   local Symbol= "Instrument : " .. source:instrument() ;
   local Time =  " Date : " .. DATA.month.." / ".. DATA.day .." Time:  ".. DATA.hour  .." / ".. DATA.min .." / ".. DATA.sec;  
   
    
    local TF= "Time Frame : " .. source:barSize();       
    local text = Note  .. delim ..  Symbol .. delim .. TF  .. delim .. Time;
	 
	 
  terminal:alertEmail(Email, profile:id(), text);
end
	 

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