-- Id: 14271
-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=62294


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

	indicator.parameters:addGroup("Calculation"); 
    indicator.parameters:addInteger("Period", "Period", "Period", 14);
	
	indicator.parameters:addString("Method", "Calculation Method","", "CS");
    indicator.parameters:addStringAlternative("Method", "Classic", "", "CS");
    indicator.parameters:addStringAlternative("Method", "TradeStation", "", "TS");
	
    indicator.parameters:addString("Type", "Selector", "Selector" , "Both");
    indicator.parameters:addStringAlternative("Type", "Both", "Both" , "Both");
    indicator.parameters:addStringAlternative("Type", "Investors", "Investors" , "Investors");
	indicator.parameters:addStringAlternative("Type", "Speculators", "Speculators" , "Speculators");
	
	indicator.parameters:addGroup("Style");
    indicator.parameters:addColor("Investors_color", "Color of Investors", "Color of Investors", core.rgb(0, 255, 0));
	indicator.parameters:addInteger("width1", "Line width", "", 1, 1, 5);
    indicator.parameters:addInteger("style1", "Line style", "", core.LINE_SOLID);
    indicator.parameters:setFlag("style1", core.FLAG_LINE_STYLE);
    indicator.parameters:addColor("Speculators_color", "Color of Speculators", "Color of Speculators", core.rgb(255, 0, 0));
	indicator.parameters:addInteger("width2", "Line width", "", 1, 1, 5);
    indicator.parameters:addInteger("style2", "Line style", "", core.LINE_SOLID);
    indicator.parameters:setFlag("style2", 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 Method;
local first;
local source = nil;
local Type;
-- Streams block
local Investors = nil;
local Speculators = nil;
local o, h, l, c, v;
-- Routine
function Prepare(nameOnly)  
    Period = instance.parameters.Period;
	if instance.parameters.Method == "CS" then
        Method = 1;
    elseif instance.parameters.Method == "TS" then
        Method = 2;
    end
	
	Type=instance.parameters.Type;
		
    source = instance.source;
    first = source:first();
	
	
	o = source.open;
    h = source.high;
    l = source.low;
    c = source.close;
    v = source.volume;

    local name = profile:id() .. "(" .. source:name() .. ", " .. tostring(Period)  .. ")";
    instance:name(name);

    if   (nameOnly) then
        return;
    end
	
		if Type ~= "Speculators" then	
			Investors = instance:addStream("Investors", core.Line, name .. ".Investors", "Investors", instance.parameters.Investors_color, first+Period);
    Investors:setPrecision(math.max(2, instance.source:getPrecision()));
			Investors:setWidth(instance.parameters.width1);
			Investors:setStyle(instance.parameters.style1);
		else	
		    Investors = instance:addInternalStream(first, 0);
		end
		
		
		if Type ~= "Investors" then	
			Speculators = instance:addStream("Speculators", core.Line, name .. ".Speculators", "Speculators", instance.parameters.Speculators_color, first+Period);
    Speculators:setPrecision(math.max(2, instance.source:getPrecision()));
			Speculators:setWidth(instance.parameters.width2);
			Speculators:setStyle(instance.parameters.style2);
		else
		    Speculators = instance:addInternalStream(first, 0);
		end
 
end

-- Indicator calculation routine
-- TODO: Add your code for calculation output values
function Update(period)
  
   
	if period < first or not source:hasData(period) then
	return;
	end
	
	local AD=0;
	
	     if Method == 1  then
            -- classic
            if h[period] - l[period] == 0 then
                AD = 0;
            else
                AD = ((c[period] - l[period]) - (h[period] - c[period])) / (h[period] - l[period]) * v[period];
            end
        else
            
            if h[period] - l[period] == 0 then
                AD = 0;
            else
                AD = (c[period] - o[period]) / (h[period] - l[period]) * v[period];
            end
        end

		if period < Period then
		return;
		end
		
		if  v[period]> mathex.avg(v, period-Period+1, period) then
		Speculators[period]= Speculators[period-1];
		Investors[period]=Investors[period-1]+AD;
		else
		Investors[period]= Investors[period-1];
		Speculators[period]=Speculators[period-1]+AD;
		end

 
end