-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=20563

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-- Indicator profile initialization routine
-- Defines indicator profile properties and indicator parameters
-- TODO: Add minimal and maximal value of numeric parameters and default color of the streams
function Init()
    indicator:name("Raw Turtle Trading Channel");
    indicator:description("Raw Turtle Trading Channel");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Indicator);
    indicator.parameters:addGroup("Calculation");
    indicator.parameters:addInteger("TradePeriod", "TradePeriod", "TradePeriod", 20);
    indicator.parameters:addInteger("StopPeriod", "StopPeriod", "StopPeriod", 10);
    indicator.parameters:addBoolean("Strict", "Calculate on Bar Close", "Calculate on Bar Close", false);
	
	indicator.parameters:addString("Show", "Show", "", "B");
	indicator.parameters:addStringAlternative("Show", "Outer", "", "O");
    indicator.parameters:addStringAlternative("Show", "Inner", "", "I");
    indicator.parameters:addStringAlternative("Show", "Both", "", "B");
	indicator.parameters:addGroup("Style");
    indicator.parameters:addColor("Outer", "Color of Outer TTC Line", "Color of Outer TTC Line", core.rgb(255, 0, 0));
	indicator.parameters:addInteger("owidth", "Line width", "", 1, 1, 5);
    indicator.parameters:addInteger("ostyle", "Line style", "", core.LINE_SOLID);
    indicator.parameters:setFlag("ostyle", core.FLAG_LINE_STYLE);
	indicator.parameters:addColor("Inner", "Color of Inner TTC Line", "Color of Inner TTC Line", core.rgb(0, 255, 0));
	indicator.parameters:addInteger("iwidth", "Line width", "", 1, 1, 5);
    indicator.parameters:addInteger("istyle", "Line style", "", core.LINE_SOLID);
    indicator.parameters:setFlag("istyle", core.FLAG_LINE_STYLE);
end

-- Indicator instance initialization routine
-- Processes indicator parameters and creates output streams
-- TODO: Refine the first period calculation for each of the output streams.
-- TODO: Calculate all constants, create instances all subsequent indicators and load all required libraries
-- Parameters block
local TradePeriod;
local StopPeriod;
local Strict;

local first;
local source = nil;
local Show;
-- Streams block
local TrendDirection;
local InnerLow = nil;
local OuterLow=nil;
local InnerHigh = nil;
local OuterHigh=nil;

-- Routine
function Prepare(nameOnly)
    Show = instance.parameters.Show;
    TradePeriod = instance.parameters.TradePeriod;
    StopPeriod = instance.parameters.StopPeriod;
    Strict = instance.parameters.Strict;
    source = instance.source;
    first = source:first()+math.max(TradePeriod, StopPeriod);
	
	

    local name = profile:id() .. "(" .. source:name() .. ", " .. tostring(TradePeriod) .. ", " .. tostring(StopPeriod) .. ", " .. tostring(Strict) .. ")";
    instance:name(name);

	if   (nameOnly) then
        return;
    end
	
	TrendDirection= instance:addInternalStream(0, 0);
   
	    if Show ~= "I" then
        OuterHigh = instance:addStream("OuterHigh", core.Line, name, "Outer High", instance.parameters.Outer, first);
		OuterHigh:setWidth(instance.parameters.owidth);
        OuterHigh:setStyle(instance.parameters.ostyle);
		OuterLow = instance:addStream("OuterLow", core.Line, name, "Outer Low", instance.parameters.Outer, first);
		OuterLow:setWidth(instance.parameters.owidth);
        OuterLow:setStyle(instance.parameters.ostyle);
		else
		OuterHigh =instance:addInternalStream(first, 0);	
        OuterLow =instance:addInternalStream(first, 0);			
		end
		 if Show ~= "O" then
		InnerHigh = instance:addStream("InnerHigh", core.Line, name, "Inner High", instance.parameters.Inner, first);
		InnerHigh:setWidth(instance.parameters.iwidth);
        InnerHigh:setStyle(instance.parameters.istyle);
		InnerLow = instance:addStream("InnerLow", core.Line, name, "Inner Low", instance.parameters.Inner, first);
		InnerLow:setWidth(instance.parameters.iwidth);
        InnerLow:setStyle(instance.parameters.istyle);
		else
		InnerHigh =instance:addInternalStream(first, 0);
		InnerLow =instance:addInternalStream(first, 0);
		end
  
end

-- Indicator calculation routine
-- TODO: Add your code for calculation output values
function Update(period)

    if Strict then
	period =period-1;
	end
	
	if period < first or  not source:hasData(period) then
	return;
	end
	
	
   
         local rlow,  rhigh; 
		 rlow,  rhigh=  mathex.minmax (source,  period-TradePeriod+1-1 , period);
       
         local  slow, shigh ;
		 slow, shigh=  mathex.minmax (source,  period-StopPeriod+1-1 , period);
		 
		InnerHigh[period]=shigh;
		InnerLow[period]=slow;
		OuterHigh[period]=rhigh; 
		OuterLow[period]=rlow; 
end