-- Id: 10876
-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=10878


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function Init()
    indicator:name("William Blau Candlestick Momentum Index");
    indicator:description("William Blau Candlestick Momentum Index");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Oscillator);

    indicator.parameters:addGroup("Calculation");
    indicator.parameters:addInteger("Period", "Period", "", 1);
    indicator.parameters:addInteger("Smooth_Period1", "Smooth period 1", "", 20);
    indicator.parameters:addInteger("Smooth_Period2", "Smooth period 2", "", 5);
    indicator.parameters:addInteger("Smooth_Period3", "Smooth period 3", "", 3);
    indicator.parameters:addString("Price1", "Price 1", "", "close");
    indicator.parameters:addStringAlternative("Price1", "close", "", "close");
    indicator.parameters:addStringAlternative("Price1", "open", "", "open");
    indicator.parameters:addStringAlternative("Price1", "high", "", "high");
    indicator.parameters:addStringAlternative("Price1", "low", "", "low");
    indicator.parameters:addStringAlternative("Price1", "median", "", "median");
    indicator.parameters:addStringAlternative("Price1", "typical", "", "typical");
    indicator.parameters:addStringAlternative("Price1", "weighted", "", "weighted");
    indicator.parameters:addString("Price2", "Price 2", "", "open");
    indicator.parameters:addStringAlternative("Price2", "close", "", "close");
    indicator.parameters:addStringAlternative("Price2", "open", "", "open");
    indicator.parameters:addStringAlternative("Price2", "high", "", "high");
    indicator.parameters:addStringAlternative("Price2", "low", "", "low");
    indicator.parameters:addStringAlternative("Price2", "median", "", "median");
    indicator.parameters:addStringAlternative("Price2", "typical", "", "typical");
    indicator.parameters:addStringAlternative("Price2", "weighted", "", "weighted");

    indicator.parameters:addGroup("Style");
    indicator.parameters:addColor("clr", "Color", "Color", core.rgb(255, 255, 0));
    indicator.parameters:addInteger("widthLinReg", "Line width", "Line width", 1, 1, 5);
    indicator.parameters:addInteger("styleLinReg", "Line style", "Line style", core.LINE_SOLID);
    indicator.parameters:setFlag("styleLinReg", core.FLAG_LINE_STYLE);
end

local first;
local source = nil;
local Period;
local Smooth_Period1;
local Smooth_Period2;
local Smooth_Period3;
local Price1;
local Price2;
local CM, AbsCM;
local EMA1, EMA2, EMA3;
local AnsEMA1, AbsEMA2, AbsEMA3;
local Blau_CMI=nil;

function Prepare(nameOnly)  
    source = instance.source;
    Period=instance.parameters.Period;
    Smooth_Period1=instance.parameters.Smooth_Period1;
    Smooth_Period2=instance.parameters.Smooth_Period2;
    Smooth_Period3=instance.parameters.Smooth_Period3;
    Price1=instance.parameters.Price1;
    Price2=instance.parameters.Price2;
    first = source:first()+2;
	
	
	local name = profile:id() .. "(" .. source:name() .. ", " .. instance.parameters.Period .. ", " .. instance.parameters.Smooth_Period1 .. ", " .. instance.parameters.Smooth_Period2 .. ", " .. instance.parameters.Smooth_Period3 .. ", " .. instance.parameters.Price1 .. ", " .. instance.parameters.Price2 .. ")";
    instance:name(name);
	
	if   (nameOnly) then
        return;
    end
	
    CM = instance:addInternalStream(first, 0);
    AbsCM = instance:addInternalStream(first, 0);
    EMA1 = core.indicators:create("EMA", CM, Smooth_Period1);
    EMA2 = core.indicators:create("EMA", EMA1.DATA, Smooth_Period2);
    EMA3 = core.indicators:create("EMA", EMA2.DATA, Smooth_Period3);
    AbsEMA1 = core.indicators:create("EMA", AbsCM, Smooth_Period1);
    AbsEMA2 = core.indicators:create("EMA", AbsEMA1.DATA, Smooth_Period2);
    AbsEMA3 = core.indicators:create("EMA", AbsEMA2.DATA, Smooth_Period3);
    
	
    Blau_CMI = instance:addStream("Blau_CMI", core.Line, name .. ".Blau_CMI", "Blau_CMI", instance.parameters.clr, AbsEMA3.DATA:first());
    Blau_CMI:setWidth(instance.parameters.widthLinReg);
    Blau_CMI:setStyle(instance.parameters.styleLinReg);
    Blau_CMI:addLevel(25);
    Blau_CMI:addLevel(-25);
	
	Blau_CMI:setPrecision(math.max(2, instance.source:getPrecision()));
end

function Update(period, mode)
   if period>first then
    CM[period]=source[Price1][period]-source[Price2][period-Period+1];
    AbsCM[period]=math.abs(CM[period]);
    EMA1:update(mode);
    EMA2:update(mode);
    EMA3:update(mode);
    AbsEMA1:update(mode);
    AbsEMA2:update(mode);
    AbsEMA3:update(mode);
    if AbsEMA3.DATA[period]>0 then
     Blau_CMI[period]=100*EMA3.DATA[period]/AbsEMA3.DATA[period];
    else
     Blau_CMI[period]=0;
    end 
   end 
end