-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=3362
-- Id: 3084

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function Init()
    indicator:name("Repulse Divergence Trend");
    indicator:description("Shows Repulse Divergence trends");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Indicator);

    indicator.parameters:addInteger("RepulsePeriod1", "RepulsePeriod1", "", 1);
    indicator.parameters:addInteger("RepulsePeriod2", "RepulsePeriod2", "", 5);
    indicator.parameters:addInteger("RepulsePeriod3", "RepulsePeriod3", "", 15);
    indicator.parameters:addInteger("RepulseLine", "RepulseLine", "", 1);
    indicator.parameters:addColor("UP_color", "Color of Uptrend", "", core.rgb(255, 0, 0));
    indicator.parameters:addColor("DN_color", "Color of Downtend", "", core.rgb(0, 255, 0));
end

-- Indicator instance initialization routine
-- Processes indicator parameters and creates output streams
-- Parameters block
local first;
local source = nil;

-- Streams block
local lineid = nil;
local dummy;
local Repulse;

-- Routine
function Prepare(nameOnly)
    UP_color = instance.parameters.UP_color;
    DN_color = instance.parameters.DN_color;
    source = instance.source;

    local name = profile:id() .. "(" .. source:name() .. ", " .. instance.parameters.RepulsePeriod1 .. ", " .. instance.parameters.RepulsePeriod2 .. ", " .. instance.parameters.RepulsePeriod3 .. ", " .. instance.parameters.RepulseLine .. ")";
    instance:name(name);
    if nameOnly then
        return;
    end
	assert(core.indicators:findIndicator("REPULSE") ~= nil, "Please, download and install REPULSE.LUA indicator");  
	assert(core.indicators:findIndicator("REPULSE_DIVERGENCE") ~= nil, "Please, download and install REPULSE_DIVERGENCE.LUA indicator");  
	
    Repulse = core.indicators:create("REPULSE_DIVERGENCE", source, instance.parameters.RepulsePeriod1, instance.parameters.RepulsePeriod2, instance.parameters.RepulsePeriod3, instance.parameters.RepulseLine, false);
    first = Repulse.DATA:first();
    dummy = instance:addStream("D", core.Line, name .. ".D", "D", UP_color, 0);
end

local pperiod = nil;
local pperiod1 = nil;
local line_id = 0;

-- Indicator calculation routine
function Update(period, mode)
    local l;
    -- if recaclulation started - remove all
    if pperiod ~= nil and pperiod > period then
        core.host:execute("removeAll");
    end
    pperiod = period;
    -- process only candles which are already closed closed.
    if pperiod1 ~= nil and pperiod1 == source:serial(period) then
        return ;
    end
    pperiod1 = source:serial(period)
    period = period - 1;

    Repulse:update(mode);

    if Repulse:getStream(3):hasData(period - 2) then
        l = math.abs(Repulse:getStream(3)[period - 2]);
        local prev = period - 2 - l;
        line_id = line_id + 1;
        core.host:execute("drawLine", line_id, source:date(prev), source.high[prev], source:date(period - 2), source.high[period - 2], UP_color);
    end
    if Repulse:getStream(4):hasData(period - 2) then
        l = math.abs(Repulse:getStream(4)[period - 2]);
        local prev = period - 2 - l;
        line_id = line_id + 1;
        core.host:execute("drawLine", line_id, source:date(prev), source.low[prev], source:date(period - 2), source.low[period - 2], DN_color);
    end
end