-- More information about this indicator can be found at:
-- http://fxcodebase.com

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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("HLC Trend");
    indicator:description("");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Oscillator);

  
 	indicator.parameters:addGroup("Calculation");	
    indicator.parameters:addInteger("Period1", "Close Period", "", 5, 1, 2000);
    indicator.parameters:addInteger("Period2", "Low Period", "", 13, 1, 2000);
    indicator.parameters:addInteger("Period3", "High Period", "", 34, 1, 2000);	
	
	indicator.parameters:addString("Method", "MA Method", "Method" , "EMA");
    indicator.parameters:addStringAlternative("Method", "MVA", "MVA" , "MVA");
    indicator.parameters:addStringAlternative("Method", "EMA", "EMA" , "EMA");
    indicator.parameters:addStringAlternative("Method", "LWMA", "LWMA" , "LWMA");
    indicator.parameters:addStringAlternative("Method", "TMA", "TMA" , "TMA");
    indicator.parameters:addStringAlternative("Method", "SMMA", "SMMA" , "SMMA");
    indicator.parameters:addStringAlternative("Method", "KAMA", "KAMA" , "KAMA");
    indicator.parameters:addStringAlternative("Method", "VIDYA", "VIDYA" , "VIDYA");
    indicator.parameters:addStringAlternative("Method", "WMA", "WMA" , "WMA");	
 
	
	 indicator.parameters:addGroup("Line Style");	
    indicator.parameters:addInteger("width", "Line width", "", 1, 1, 5);
    indicator.parameters:addInteger("style", "Line style", "", core.LINE_SOLID);
    indicator.parameters:setFlag("style", core.FLAG_LINE_STYLE);
	
	 indicator.parameters:addColor("Up", "Up Line Color", "", core.rgb(0, 255, 0)); 
	 indicator.parameters:addColor("Down", "Down Line Color", "", core.rgb(255, 0, 0)); 
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 first;
local source = nil;
local Period1, Period2, Period3,Method; 
local High, Low, Close;
local Up, Down;
	
-- Routine
 function Prepare(nameOnly)   
 
    
	Period1=instance.parameters.Period1;
	Period2=instance.parameters.Period2;
	Period3=instance.parameters.Period3;	
	Method=instance.parameters.Method;
	source = instance.source
 
    local name = profile:id() .. "(" ..  instance.source:name().. "," ..  Period1.. "," ..  Period2.. "," ..  Period3 .. "," ..  Method .. ")";
    instance:name(name); 


    if   (nameOnly) then
        return;
    end
	
	Close= core.indicators:create(Method, source.close, Period1 );
	Low= core.indicators:create(Method, source.low, Period2 );
	High= core.indicators:create(Method, source.high, Period3 );
	
	first=math.max(Low.DATA:first(),High.DATA:first(),Close.DATA:first() ); 
	
 
	
	
    Up = instance:addStream("Up", core.Line, name, "Up", instance.parameters.Up, first );
    Up:setPrecision(math.max(2, instance.source:getPrecision()));
    Up:setWidth(instance.parameters.width);
    Up:setStyle(instance.parameters.style);
    Up:addLevel(0);	
	
    Down = instance:addStream("Down", core.Line, name, "Down", instance.parameters.Down, first );
    Down:setPrecision(math.max(2, instance.source:getPrecision()));
    Down:setWidth(instance.parameters.width);
    Down:setStyle(instance.parameters.style);
    Down:addLevel(0);	
end


function Update(period, mode)

	Close:update(mode); 
	High:update(mode); 
	Low:update(mode); 	
	 if period < first then
	 return;
	 end
	 
	
	Up[period]= Close.DATA[period]-High.DATA[period];
	Down[period]= Low.DATA[period]-Close.DATA[period];	
end