-- Id: 8592

-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=32520

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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("PAIN");
    indicator:description("PAIN");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Oscillator);
    indicator.parameters:addGroup("Calculation");	
    indicator.parameters:addInteger("Period", "Period", "Period", 10);
	indicator.parameters:addString("Method", "MA Method", "Method" , "MVA");
    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("Style");
    indicator.parameters:addColor("Pain_color", "Color of Pain", "Color of Pain", 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, Method;

local first;
local source = nil;

-- Streams block
local Pain = nil;
local OPEN, CLOSE, HIGH, LOW;
-- Routine
function Prepare(nameOnly)
    Period = instance.parameters.Period;
	Method = instance.parameters.Method;
    source = instance.source;
	
	
	local name = profile:id() .. "(" .. source:name() .. ", " .. tostring(Period) .. ", " .. tostring(Method).. ")";
    instance:name(name);
	
	if   (nameOnly) then
        return;
    end
	
    assert(core.indicators:findIndicator(Method) ~= nil, Method .. " indicator must be installed");
	OPEN = core.indicators:create(Method, source.open, Period);
	CLOSE = core.indicators:create(Method, source.close, Period);
	HIGH = core.indicators:create(Method, source.high, Period);
	LOW = core.indicators:create(Method, source.low, Period);
	
    first = CLOSE.DATA:first();



    
        Pain = instance:addStream("Pain", core.Line, name, "Pain", instance.parameters.Pain_color, first);
    Pain:setPrecision(math.max(2, instance.source:getPrecision()));
		Pain:setWidth(instance.parameters.width);
        Pain:setStyle(instance.parameters.style);
 
end

-- Indicator calculation routine
-- TODO: Add your code for calculation output values
function Update(period, mode)
   CLOSE:update(mode);
   OPEN:update(mode);
   HIGH:update(mode);
   LOW:update(mode);
	
    if period < first   then
	return;
	end
    

    Pain[period] =  ( (CLOSE.DATA[period]-OPEN.DATA[period])+(CLOSE.DATA[period]-HIGH.DATA[period])+(CLOSE.DATA[period]-LOW.DATA[period]) ) / 2;
    
end