-- Id: 3163
-- More information about this indicator can be found at:
-- http://fxcodebase.com/

--+------------------------------------------------------------------+
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--|                                            http://fxcodebase.com |
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--|                                      Developed by : Mario Jemic  |
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function Init()
    indicator:name("Percent Retracement (PCR)");
    indicator:description("");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Oscillator);

    indicator.parameters:addInteger("Frame", "Period", "", 10);
	
	indicator.parameters:addGroup("Line Style");
    indicator.parameters:addColor("color", "Line Color", "", core.rgb(255, 0, 0));
	indicator.parameters:addInteger("width", "Line width", "Line width", 1, 1, 5);
    indicator.parameters:addInteger("style", "Line style", "Line style", core.LINE_SOLID);
    indicator.parameters:setFlag("style", core.FLAG_LINE_STYLE);
	
	indicator.parameters:addGroup("Oversold Overbought Levels");
	 indicator.parameters:addInteger("OB", "Overbought Level", "", 80);
	  indicator.parameters:addInteger("OS", "Oversold Level", "", 20);
	
	
	indicator.parameters:addGroup("Oversold Overbought Levels Style");
	 indicator.parameters:addColor("os_color", "Color of S1", "Color of S1", core.rgb(0, 0, 255));
	indicator.parameters:addInteger("os_width", "Line width", "Line width", 1, 1, 5);
    indicator.parameters:addInteger("os_style", "Line style", "Line style", core.LINE_SOLID);
    indicator.parameters:setFlag("os_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 Frame;
local color, os_color;
local OB,OS;

local first;
local source = nil;

-- Streams block
local PCR = nil;

-- Routine
function Prepare(nameOnly)
    OB=instance.parameters.OB;
	OS=instance.parameters.OS;
	os_width=instance.parameters.os_width;
	os_style=instance.parameters.os_style;
    os_color=instance.parameters.os_color;
    color=instance.parameters.color;
    Frame = instance.parameters.Frame;
    source = instance.source;
    first = source:first();

    local name = profile:id() .. "(" .. source:name() .. ", " .. Frame .. ")";
    instance:name(name);
    if nameOnly then
        return;
    end
    PCR = instance:addStream("PCR", core.Line, name, "PCR", color, first+Frame);
    PCR:setPrecision(math.max(2, instance.source:getPrecision()));
	PCR:setWidth(instance.parameters.width);
    PCR:setStyle(instance.parameters.style);
end

-- Indicator calculation routine
-- TODO: Add your code for calculation output values
function Update(period)
    if period >= first+Frame and source:hasData(period) then
	   
	   local  min, max;
	   min, max =  mathex.minmax (source, period-Frame, period);
	    
        PCR[period] =100*(1-  (max-source.close[period])/(max-min));
		
		core.host:execute ("drawLine", 1,  source:date(first), OB, source:date(period), OB, os_color, os_style, os_width);	
        core.host:execute ("drawLine", 2, source:date(first), OS, source:date(period), OS, os_color, os_style, os_width);	
		
		
    end
end