-- Id: 948
-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=1376

--+------------------------------------------------------------------+
--|                               Copyright © 2018, Gehtsoft USA LLC | 
--|                                            http://fxcodebase.com |
--+------------------------------------------------------------------+
--|                                      Developed by : Mario Jemic  |                    
--|                                          mario.jemic@gmail.com   |
--+------------------------------------------------------------------+
--|                                 Support our efforts by donating  | 
--|                                    Paypal: https://goo.gl/9Rj74e |
--|                    BitCoin : 15VCJTLaz12Amr7adHSBtL9v8XomURo9RF  |  
--|                BitCoin Cash: 1BEtS465S3Su438Kc58h2sqvVvHK9Mijtg  | 
--|           Ethereum : 0x8C110cD61538fb6d7A2B47858F0c0AaBd663068D  |  
--|                   LiteCoin : LLU8PSY2vsq7B9kRELLZQcKf5nJQrdeqwD  |  
--+------------------------------------------------------------------+


-- 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("Bear Power");
    indicator:description("The oscillators measures the buying and selling pressure in the market");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Oscillator);

    indicator.parameters:addInteger("Frame", "Period", "Time Frame", 13, 2 , 2000);
    indicator.parameters:addColor("Bears_color", "Color of Bears", "Color of Bears", core.rgb(255, 0, 0));
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 first;
local source = nil;

-- Streams block
local Bears = nil;
local EMA=nil;
-- Routine
 function Prepare(nameOnly)  
    Frame = instance.parameters.Frame;
    source = instance.source;
   
	local name = profile:id() .. "(" .. source:name() .. ", " .. Frame .. ")";
    instance:name(name);
	
	if   (nameOnly) then
        return;
    end
	 
	EMA=core.indicators:create("EMA", source.close, Frame);
	 first = EMA.DATA:first();
	
	
    Bears = instance:addStream("Bears", core.Bar, name, "Bears", instance.parameters.Bears_color, first);
	Bears:setPrecision(math.max(2, instance.source:getPrecision()));
end

-- Indicator calculation routine
-- TODO: Add your code for calculation output values
function Update(period,mode)

    if period < first  then
	return;
	end
	
	  EMA:update(mode);
	
        Bears[period] = source.low[period] - EMA.DATA[period];
    
end