-- More information about this indicator can be found at:
-- https://fxcodebase.com/code/viewtopic.php?f=17&t=71375

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--|BitCoin Address            : 15VCJTLaz12Amr7adHSBtL9v8XomURo9RF                                 |
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--|Cardano/ADA                : addr1v868jza77crzdc87khzpppecmhmrg224qyumud6utqf6f4s99fvqv         |  
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--|Binance(ERC20 & BSC only)  : 0xe84751063de8ade7c5fbff5e73f6502f02af4e2c                         |                                                  |   
--+------------------------------------------------------------------------------------------------+

function Init()
    indicator:name("Averaged Bid Ask Channel");
    indicator:description("The indicator shows a middle price between bid and ask prices");
    indicator:requiredSource(core.Tick);
    indicator:type(core.Indicator);
    indicator:setTag("replaceSource", "t");
	
	
	
	indicator.parameters:addGroup("Calculation"); 	
	indicator.parameters:addInteger("Period", "MA Period", "Period" , 14);
	indicator.parameters:addString("Method", "MA Method", "Method" , "MVA");
    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:addGroup("Top Line Style"); 	
    indicator.parameters:addColor("color1", "Line Color", "", core.rgb(255, 0, 0));
	indicator.parameters:addInteger("style1", "Line Style", "", core.LINE_SOLID);
    indicator.parameters:setFlag("style1", core.FLAG_LEVEL_STYLE);	
	indicator.parameters:addInteger("width1", "Line Width", "", 3, 1, 5);
	
	
	indicator.parameters:addGroup("Bottom Line Style"); 	
    indicator.parameters:addColor("color2", "Line Color", "", core.rgb(0, 255, 0));
	indicator.parameters:addInteger("style2", "Line Style", "", core.LINE_SOLID);
    indicator.parameters:setFlag("style2", core.FLAG_LEVEL_STYLE);	
	indicator.parameters:addInteger("width2", "Line Width", "", 3, 1, 5);
	
	
	indicator.parameters:addGroup("Central Line Style"); 	
    indicator.parameters:addColor("color3", "Line Color", "", core.rgb(0, 0, 128));
	indicator.parameters:addInteger("style3", "Line Style", "", core.LINE_SOLID);
    indicator.parameters:setFlag("style3", core.FLAG_LEVEL_STYLE);	
	indicator.parameters:addInteger("width3", "Line Width", "", 3, 1, 5);
end

local first;
local bid, ask;
local Top, Bottom, Central;
local top, bottom, central,mid;
local source;
local AskColor, BidColor, LineSize, LineStyle;
local Method, Period;
function Prepare(nameOnly)
    source = instance.source;
    local name;
    name = profile:id() .. "(" .. source:name() .. ")";
    instance:name(name);
	
	if   (nameOnly) then
        return;
    end

    bid = core.host:execute("getBidPrice");
    ask = core.host:execute("getAskPrice");
	mid = instance:addInternalStream(0, 0);
	
	Method=instance.parameters.Method;
	Period=instance.parameters.Period;
	
	top = core.indicators:create(Method, bid, Period);
	bottom = core.indicators:create(Method, ask, Period);
	central = core.indicators:create(Method, mid, Period);
	
	first = central.DATA:first();
	
	Top = instance:addStream("Top" , core.Line, " Top"," Top",instance.parameters.color1, first );
	Top:setWidth(instance.parameters.width1);
    Top:setStyle(instance.parameters.style1);
    Top:setPrecision(math.max(2, source:getPrecision()));
	
	
	Bottom = instance:addStream("Bottom" , core.Line, " Bottom"," Bottom",instance.parameters.color2, first );
	Bottom:setWidth(instance.parameters.width2);
    Bottom:setStyle(instance.parameters.style2);
    Bottom:setPrecision(math.max(2, source:getPrecision()));
	
	
	Central = instance:addStream("Central" , core.Line, " Central"," Central",instance.parameters.color3, first );
	Central:setWidth(instance.parameters.width3);
    Central:setStyle(instance.parameters.style3);
    Central:setPrecision(math.max(2, source:getPrecision()));
end

function Update(period, mode)


    if period <source:first() then
	return;
	end
	
	mid[period]= (ask.high[period]+ bid.low[period])/2;

	top:update(mode);
	central:update(mode);
	bottom:update(mode);

    if period < first then
	return;
	end 
         
    Central[period] = central.DATA[period];
    Top[period] = top.DATA[period];
    Bottom[period] = bottom.DATA[period];
    
end