-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=62065

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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("Murrey's Math Oscillator Overlay");
    indicator:description("Murrey's Math Oscillator Overlay");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Indicator);
    indicator.parameters:addGroup("Calculation");	
    indicator.parameters:addInteger("length", "Look back Length", "Look back Length", 100);
    indicator.parameters:addDouble("mult", "Mutiplier", "Mutiplier", 0.125);
    indicator.parameters:addBoolean("lines", "Show Murrey Math Fractals", "Show Murrey Math Fractals", true);

	
	indicator.parameters:addGroup("Style");
 
	indicator.parameters:addColor("P1_color", "1.Positive Zone Color", "Zone Color", core.rgb(173, 255, 47));
	indicator.parameters:addColor("P2_color", "2. Positive Zone Color", "Zone Color", core.rgb(50, 205, 50));
	indicator.parameters:addColor("P3_color", "3. Positive Zone Color", "Zone Color", core.rgb(60, 179, 113));
	indicator.parameters:addColor("P4_color", "4. Positive Zone Color", "Zone Color", core.rgb(0, 128, 0));
	indicator.parameters:addColor("N1_color", "1. Negative Zone Color", "Zone Color", core.rgb(205, 92, 92));
	indicator.parameters:addColor("N2_color", "2. Negative Zone Color", "Zone Color", core.rgb(250, 128, 114));
	indicator.parameters:addColor("N3_color", "3. Negative Zone Color", "Zone Color", core.rgb(255, 160, 122));
	indicator.parameters:addColor("N4_color", "4. Negative Zone Color", "Zone Color", core.rgb(255, 0, 0));
	indicator.parameters:addColor("Neutral_color", "Neutral Color", "Neutral Color", core.rgb(0, 0, 288));

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 length;
local mult;
local lines;

local first;
local source = nil;
 
local open=nil;
local close=nil;
local high=nil;
local low=nil;
 
-- Streams block
local oscillator = nil;

-- Routine
 function Prepare(nameOnly)   
 
    local name = profile:id() .. "(" ..  instance.source:name()  .. ")";
    instance:name(name); 


    if   (nameOnly) then
        return;
    end
	
	
    length = instance.parameters.length;
    mult = instance.parameters.mult;
    lines = instance.parameters.lines;
    source = instance.source;
    first = source:first()+length;

   
	
 
	open = instance:addStream("open", core.Line, name, "open", core.rgb(0, 0, 0), source:first())
    high = instance:addStream("high", core.Line, name, "high", core.rgb(0, 0, 0), source:first())
    low = instance:addStream("low", core.Line, name, "low", core.rgb(0, 0, 0), source:first())
    close = instance:addStream("close", core.Line, name, "close", core.rgb(0, 0, 0), source:first())
    instance:createCandleGroup("ZONE", "", open, high, low, close); 
 
	
   
        oscillator = instance:addInternalStream(0, 0);
 
end

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

    high[period]= source.high[period];
	low[period]= source.low[period];		   
	close[period] = source.close[period];
	open[period]  = source.open[period];	
	
	
	
		
    if period < first or not source:hasData(period) then
	open:setColor(period, instance.parameters.Neutral_color);
	return;
	end
    
    --Donchanin Channel
	local lo, hi = mathex.minmax(source,period-length+1, period);
    local range = hi - lo;
	local multiplier = range * mult;
    local midline = lo + multiplier * 4;


    oscillator[period] =  (source.close[period] - midline)/(range/2);
	
	local Color;
	
	if oscillator[period] > 0 then
	   
	    if oscillator[period] <= mult*2  then
		Color=instance.parameters.P1_color;
		elseif oscillator[period] <= mult*4  then
		Color=instance.parameters.P2_color;
		elseif oscillator[period] <= mult*6  then
		Color=instance.parameters.P3_color;
		elseif oscillator[period] <= mult*8  then
		Color=instance.parameters.P4_color;
		else
		Color=instance.parameters.Neutral_color;
		end
	
	elseif  oscillator[period] < 0 then
	
	    if oscillator[period] >=  -mult*2  then
		Color=instance.parameters.N1_color; 
		elseif oscillator[period] >= -mult*4  then
		Color=instance.parameters.N2_color;
		elseif oscillator[period] >= -mult*6  then
		Color=instance.parameters.N3_color;
		elseif oscillator[period] >= -mult*8  then
		Color=instance.parameters.N4_color;
		else
		Color=instance.parameters.Neutral_color;
		end
	
	else
		Color=instance.parameters.Neutral_color;	
	
	end
	
	open:setColor(period, Color);
     
end