-- Id: 8334
-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=30266

--+------------------------------------------------------------------+
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--|                                            http://fxcodebase.com |
--+------------------------------------------------------------------+
--|                                      Developed by : Mario Jemic  |
--|                                          mario.jemic@gmail.com   |
--+------------------------------------------------------------------+
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--+------------------------------------------------------------------+
function Init()
    indicator:name("Adaptive Price Zone");
    indicator:description("Adaptive Price Zone");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Indicator);
	
	
	indicator.parameters:addGroup("Calculation");  
    indicator.parameters:addString("Price", "Price Source", "", "close");
    indicator.parameters:addStringAlternative("Price", "OPEN", "", "open");
    indicator.parameters:addStringAlternative("Price", "HIGH", "", "high");
    indicator.parameters:addStringAlternative("Price", "LOW", "", "low");
    indicator.parameters:addStringAlternative("Price","CLOSE", "", "close");
    indicator.parameters:addStringAlternative("Price", "MEDIAN", "", "median");
    indicator.parameters:addStringAlternative("Price", "TYPICAL", "", "typical");
    indicator.parameters:addStringAlternative("Price", "WEIGHTED", "", "weighted");	
	
    indicator.parameters:addInteger("Period", "Period", "Period", 10);
	indicator.parameters:addString("Method", "MA Method", "Method" , "KAMA");
    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:addDouble("width", "width [%]", "width [%]", 2);
	
	indicator.parameters:addGroup("Style");	
    indicator.parameters:addColor("Up_color", "Color of Up", "Color of Up", core.rgb(255, 0, 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("Dn_color", "Color of Dn", "Color of Dn", 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 width;
local Method;
local first;
local source = nil;
local Price;
-- Streams block
local Up = nil;
local Dn = nil;
local MA1, MA2;
local Buff;
-- Routine
function Prepare(nameOnly)
    Period = instance.parameters.Period;
	Method= instance.parameters.Method;
	Price= instance.parameters.Price;
    width = instance.parameters.width;
    source = instance.source;
	
    local name = profile:id() .. "(" .. source:name() .. ", " .. tostring(Price) .. ", " .. tostring(Period) .. ", " .. tostring(Method)  .. ", " .. tostring(width).. ")";
    instance:name(name);

    if (not (nameOnly)) then
        Buff = instance:addInternalStream(0, 0);
             
    assert(core.indicators:findIndicator(Method) ~= nil, Method .. " indicator must be installed");
        MA1 = core.indicators:create(Method,source[Price] , Period);
        MA2 = core.indicators:create(Method,Buff , Period);
        first = math.max(MA1.DATA:first(),MA2.DATA:first());
    
        Up = instance:addStream("Up", core.Line, name .. ".Up", "Up", instance.parameters.Up_color, first);
		Up:setWidth(instance.parameters.width1);
        Up:setStyle(instance.parameters.style1);
        Dn = instance:addStream("Dn", core.Line, name .. ".Dn", "Dn", instance.parameters.Dn_color, first);
		Dn:setWidth(instance.parameters.width2);
        Dn:setStyle(instance.parameters.style2);
    end
end

-- Indicator calculation routine
-- TODO: Add your code for calculation output values
function Update(period, mode)
   
   
   Buff[period]= source.high[period]-source.low[period];



    if period < first then
	return;
	end
	
	MA1:update(mode);
    MA2:update(mode);
    
	
        Up[period] = width *MA2.DATA[period] + MA1.DATA[period];
        Dn[period] = MA1.DATA[period] - width * MA2.DATA[period] ;
    
end