-- Available @ https://fxcodebase.com/code/viewtopic.php?f=17&t=74915

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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("Inside bar support and resistance");
    indicator:description("");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Indicator);
	
    indicator.parameters:addGroup("Calculation"); 	 
    indicator.parameters:addInteger("Period", "MA Period", "MA Period", 14);
	indicator.parameters:addString("TF", "Bar Size to display High/Low", "", "D1");
	indicator.parameters:setFlag("TF", core.FLAG_PERIODS);
	
	indicator.parameters:addGroup("Style"); 	
    indicator.parameters:addColor("color1", "Support Line Color", "", core.rgb(0, 255, 0));
    indicator.parameters:addColor("color2", "Resistance Line Color", "", core.rgb(255, 0, 0));	
	
	 indicator.parameters:addInteger("style", "Line Style", "", core.LINE_SOLID);
    indicator.parameters:setFlag("style", core.FLAG_LEVEL_STYLE);	
	indicator.parameters:addInteger("width", "Line Width", "", 3, 1, 5);
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 first;
	local source = nil;
	local TF; 
	local dayoffset;
	local weekoffset;
	local SourceData;
	local loading = false;   
	local Indicator;
-- Streams block
    local MA = nil;

-- Routine

function Prepare(nameOnly)   
 
    local name = profile:id() .. "(" ..  instance.source:name()  .. ")";
    instance:name(name); 


    if   (nameOnly) then
        return;
    end

	
	
    Period = instance.parameters.Period;
    source = instance.source;
    first = source:first();	
	 
    dayoffset = core.host:execute("getTradingDayOffset");
    weekoffset = core.host:execute("getTradingWeekOffset");
    TF = instance.parameters.TF;
	
	
	 local s1, e1, s2, e2;
    s1, e1 = core.getcandle(source:barSize(),0, 0, 0);
    s2, e2 = core.getcandle(TF, 0, 0, 0);
    assert ((e1 - s1) <= (e2 - s2), "The chosen time frame must be equal to or bigger than the chart time frame!");
	
	local Test = core.indicators:create("MVA", source ,Period);   
	first= Test.DATA:first() ; 		
	
	SourceData = core.host:execute("getSyncHistory", source:instrument(), TF, source:isBid(), first, 100, 101);
	loading=true;
 
 

    Support = instance:addStream("Support", core.Line, name, "Support", instance.parameters.color1, source:first());
	Support:setWidth(instance.parameters.width);
    Support:setStyle(instance.parameters.style);


    Resistance = instance:addStream("Resistance", core.Line, name, "Resistance", instance.parameters.color2, source:first());
	Resistance:setWidth(instance.parameters.width);
    Resistance:setStyle(instance.parameters.style);   
end


function   Initialization(period)

    local Candle;
    Candle = core.getcandle(TF, source:date(period), dayoffset, weekoffset);

  
    if loading or SourceData:size() == 0 then
        return false ;
    end

    
    if period < source:first() then
        return false;
    end

    local p = core.findDate(SourceData, Candle, false);

    -- candle is not found
    if p < 0 then
        return false;
	else return p;	
    end
	
end	

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

        local p =  Initialization(period) 
     
	    if not p then
		return;
		end
		
	
 
	 
	if SourceData.high[p]< SourceData.high[p-1] 
	and  SourceData.low[p]> SourceData.low[p-1] 
	then
	Support[period]=SourceData.low[p-1];
	Resistance[period]=SourceData.high[p-1];
	else
	Support[period]=Support[period-1];
	Resistance[period]=Resistance[period-1];
	end


    Support:setBreak (period, Support[period]~=Support[period-1]);
    Resistance:setBreak (period, Support[period]~=Support[period-1]);
 
 
  
end

-- the function is called when the async operation is finished
function AsyncOperationFinished(cookie)
    if cookie == 100 then
        loading = false;
        instance:updateFrom(0);
    elseif cookie == 101 then
        loading = true;
    end
	
    return core.ASYNC_REDRAW ; 
end


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