-- Id: 3657
-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=3941

--+------------------------------------------------------------------+
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--|                                            http://fxcodebase.com |
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--|                                      Developed by : Mario Jemic  |
--|                                          mario.jemic@gmail.com   |
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--+------------------------------------------------------------------+

function Init()
    indicator:name("ChannelBalance");
    indicator:description("ChannelBalance");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Oscillator);

	
	indicator.parameters:addGroup("Calculation");
    indicator.parameters:addInteger("PERIOD", "PERIOD", "PERIOD", 20);
	
	indicator.parameters:addGroup("Line Style");
    indicator.parameters:addColor("CB_Color", " Channel Balance Line Color", "", core.rgb(255, 0, 0));	

	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);
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 PERIOD;

local first;
local source = nil;

-- Streams block
local ChannelBalance = nil;
local TEMP;

-- Routine
function Prepare(nameOnly)
    PERIOD = instance.parameters.PERIOD;
    source = instance.source;
    first = source:first()+PERIOD;
	
    local name = profile:id() .. "(" .. source:name() .. ", " .. tostring(PERIOD) .. ")";
    instance:name(name);

    if (not (nameOnly)) then
        TEMP=instance:addInternalStream (0, 0)
        ChannelBalance = instance:addStream("ChannelBalance", core.Line, name, "ChannelBalance", instance.parameters.CB_Color, first +PERIOD);
    ChannelBalance:setPrecision(math.max(2, instance.source:getPrecision()));
		ChannelBalance:setWidth(instance.parameters.width);
	    ChannelBalance:setStyle(instance.parameters.style);
    end
end

-- Indicator calculation routine
-- TODO: Add your code for calculation output values
function Update(period)
    if period < first   then	
	return;
	end
	
	local min, max;
	min, max=mathex.minmax (source, period-PERIOD+1, period);
    
    local Range = max - min;
    
	TEMP[period] = (source.median[period] - min) / Range;
	
	
	 if period < first +PERIOD  then	
	return;
	end
	
	local  SUM = mathex.sum (TEMP, period-PERIOD+1, period);

    ChannelBalance[period] = (SUM / PERIOD)*100;
    
end