-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=883
-- Id: 13248

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function Init()
    indicator:name("Sample Day-based oscillator");
    indicator:description("Developed exclusively to show on how to use the Day as the base of the custom indicator");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Oscillator);

	indicator.parameters:addGroup("Calculation");	
    indicator.parameters:addString("Mode", "The Indicator Mode", "", "P");
    indicator.parameters:addStringAlternative("Mode", "Net Change", "", "N");
    indicator.parameters:addStringAlternative("Mode", "Percent Change", "", "P");
	
	indicator.parameters:addString("Instrument", "Instrument", "", "Chart");
    indicator.parameters:setFlag("Instrument", core.FLAG_INSTRUMENTS );
	
	indicator.parameters:addBoolean("Show", "Show Levels", "", false);
	indicator.parameters:addGroup("Style");	
    indicator.parameters:addColor("color", "Color of the oscillator line", "", core.rgb(255, 0, 0));
	indicator.parameters:addInteger("width", "Line width", "", 1, 1, 5);
    indicator.parameters:addInteger("style", "Line style", "", core.LINE_SOLID);
    indicator.parameters:setFlag("style", core.FLAG_LINE_STYLE);
	
	
	
	
	
	
	indicator.parameters:addGroup("Levels");	
	indicator.parameters:addDouble("level1","1. Level","", 0);
	indicator.parameters:addColor("color1", "1. Line Color","", core.rgb(128, 128, 128));
    indicator.parameters:addInteger("width1","1. Line width","", 1, 1, 5);
    indicator.parameters:addInteger("style1", "1. Line Style","", core.LINE_SOLID);
    indicator.parameters:setFlag("style1", core.FLAG_LEVEL_STYLE);
	
	
	indicator.parameters:addDouble("level2","2. Level","", 0.25);
	indicator.parameters:addColor("color2", "2. Line Color","", core.rgb(0, 255, 255));
    indicator.parameters:addInteger("width2","2. Line width","", 1, 1, 5);
    indicator.parameters:addInteger("style2", "2. Line Style","", core.LINE_SOLID);
    indicator.parameters:setFlag("style2", core.FLAG_LEVEL_STYLE);
	
	indicator.parameters:addDouble("level3","3. Level","", 0.5);
	indicator.parameters:addColor("color3", "3. Line Color","", core.rgb(0, 128, 255));
    indicator.parameters:addInteger("width3","3. Line width","", 1, 1, 5);
    indicator.parameters:addInteger("style3", "3. Line Style","", core.LINE_SOLID);
    indicator.parameters:setFlag("style3", core.FLAG_LEVEL_STYLE);
	
	
	indicator.parameters:addDouble("level4","4. Level","", 0.75);
	indicator.parameters:addColor("color4", "4. Line Color","", core.rgb(0, 0, 255));
    indicator.parameters:addInteger("width4","4. Line width","", 1, 1, 5);
    indicator.parameters:addInteger("style4", "4. Line Style","", core.LINE_SOLID);
    indicator.parameters:setFlag("style4", core.FLAG_LEVEL_STYLE);
	
	
	indicator.parameters:addDouble("level5","5. Level","", 1);
	indicator.parameters:addColor("color5", "5. Line Color","", core.rgb(255, 0, 0));
    indicator.parameters:addInteger("width5","5. Line width","", 1, 1, 5);
    indicator.parameters:addInteger("style5", "5. Line Style","", core.LINE_SOLID);
    indicator.parameters:setFlag("style5", core.FLAG_LEVEL_STYLE);
	
	indicator.parameters:addDouble("level6","6. Level","", 1.25);
	indicator.parameters:addColor("color6", "6. Line Color","", core.rgb(255, 128, 64));
    indicator.parameters:addInteger("width6","6. Line width","", 1, 1, 5);
    indicator.parameters:addInteger("style6", "6. Line Style","", core.LINE_SOLID);
    indicator.parameters:setFlag("style6", core.FLAG_LEVEL_STYLE);
	
	indicator.parameters:addDouble("level7","7. Level","", 1.5);
	indicator.parameters:addColor("color7", "7. Line Color","", core.rgb(0, 255, 0));
    indicator.parameters:addInteger("width7","7. Line width","", 1, 1, 5);
    indicator.parameters:addInteger("style7", "7. Line Style","", core.LINE_SOLID);
    indicator.parameters:setFlag("style7", core.FLAG_LEVEL_STYLE);
	
end

local source;
local Source={};
local TF={}; 
local loading={};
local host;
local dayoffset;
local weekoffset;
local Mode;
local Show;
local Day;
-- Day results
local O;            -- open
local OUT = nil;
local Instrument;

local Number=2;
function Prepare(nameOnly)
    InitDay();

    Mode = instance.parameters.Mode;
	Show = instance.parameters.Show;
	Instrument = instance.parameters.Instrument;
	
	local name;
    name = profile:id() .. "(" .. source:name()  .. "," .. Mode .. ")";
    instance:name(name);
    if nameOnly then
        return;
    end
    OUT = instance:addStream("O", core.Line, name .. ".O", "O", instance.parameters.color, 0);
    OUT:setPrecision(math.max(2, instance.source:getPrecision()));
	OUT:setWidth(instance.parameters.width);
    OUT:setStyle(instance.parameters.style);
	
	if Show then
	OUT:addLevel(instance.parameters.level1, instance.parameters.style1, instance.parameters.width1, instance.parameters.color1);
    OUT:addLevel(-(instance.parameters.level1), instance.parameters.style1, instance.parameters.width1, instance.parameters.color1);
	
	OUT:addLevel(instance.parameters.level2, instance.parameters.style2, instance.parameters.width2, instance.parameters.color2);
    OUT:addLevel(-(instance.parameters.level2), instance.parameters.style2, instance.parameters.width2, instance.parameters.color2);
	
	OUT:addLevel(instance.parameters.level3, instance.parameters.style3, instance.parameters.width3, instance.parameters.color3);
    OUT:addLevel(-(instance.parameters.level3), instance.parameters.style3, instance.parameters.width3, instance.parameters.color3);
	
	
	OUT:addLevel(instance.parameters.level4, instance.parameters.style4, instance.parameters.width4, instance.parameters.color4);
    OUT:addLevel(-(instance.parameters.level4), instance.parameters.style4, instance.parameters.width4, instance.parameters.color4);
	
	OUT:addLevel(instance.parameters.level5, instance.parameters.style5, instance.parameters.width5, instance.parameters.color5);
    OUT:addLevel(-(instance.parameters.level5), instance.parameters.style5, instance.parameters.width5, instance.parameters.color5);
	
	OUT:addLevel(instance.parameters.level6, instance.parameters.style6, instance.parameters.width6, instance.parameters.color6);
    OUT:addLevel(-(instance.parameters.level6), instance.parameters.style6, instance.parameters.width6, instance.parameters.color6);
	
	OUT:addLevel(instance.parameters.level7, instance.parameters.style7, instance.parameters.width7, instance.parameters.color7);
    OUT:addLevel(-(instance.parameters.level7), instance.parameters.style7, instance.parameters.width7, instance.parameters.color7);
	end
	local id=0;
	for i= 1 , Number , 1 do
	id=id+1;
    Source[i] = core.host:execute("getSyncHistory",Instrument, TF[i], source:isBid(), 0, 200+id, 100+id);
	loading[i]=true;
	end		
end



function Update(period )

     local p1 =  Initialization(period,1); 
     local p2 =  Initialization(period,2); 
	 
	    if not p1 or not p2 then
		return;
		end
		
   
    if Mode == "P" then
        OUT[period] = (Source[2].close[p2] - Source[1].open[p1]) / Source[1].open[p1] * 100;
    else
        OUT[period] = (Source[2].close[p2] - Source[1].open[p1]) / source:pipSize();
    end
end

function   Initialization(period,id)

    local Candle;
    Candle = core.getcandle(source:barSize(), source:date(period), dayoffset, weekoffset);
  
    if loading[id] or Source[id]:size() == 0  then
        return false;
    end

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

    local P = core.findDate(Source[id], Candle, false);
	 

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




-- the function is called when the async operation is finished
function AsyncOperationFinished(cookie)
     local j;	 
	local Flag = true;	
	local Count=0;	
	
	
	    local id=0;
		
    for j = 1, Number, 1 do
		id=id+1;
			  if cookie == (100+id) then
			  loading[j] = true;
		      elseif  cookie == (200+id) then
			  loading[j] = false;			  		 
              end
			  
		if loading[j] then
		Count=Count+1;
		Flag=false;
		end	 

		  
		
	end    
	
	    if Flag then
		core.host:execute ("setStatus", " ");
		instance:updateFrom(0);
		else
		core.host:execute ("setStatus", " Loading ".. (Number-Count) .."/" .. Number);
		end
			     
        
		return core.ASYNC_REDRAW ;
end

function InitDay()
    host = core.host;
    dayoffset = host:execute("getTradingDayOffset");
    weekoffset = host:execute("getTradingWeekOffset");

    source = instance.source;
        -- validate
    local l1, l2;
    local s, e;
	
	TF[1]="D1";
	TF[2]=source:barSize();

    s, e = core.getcandle(TF[2], core.now(), 0);
    l1 = e - s;
    s, e = core.getcandle(TF[1], core.now(), 0);
    l2 = e - s;
    assert(l1 <= l2, "The source frame must be shorter or equal to the day timeframe");


end