-- Id: 1565
-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=2107


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function Init()
    strategy:name("Clear Method Signal");
	strategy:setTag("NonOptimizableParameters", "Email,SendEmail,SoundFile,RecurrentSound,PlaySound,ShowAlert");
    strategy:description("Signals when Ron Black's clear method indicator changes direction");

    strategy.parameters:addGroup("Price Parameters");
    strategy.parameters:addString("Type", "Price type", "", "Bid");
    strategy.parameters:addStringAlternative("Type", "Bid", "", "Bid");
    strategy.parameters:addStringAlternative("Type", "Ask", "", "Ask");
    strategy.parameters:addString("Period", "Timeframe", "", "m1");
    strategy.parameters:setFlag("Period", core.FLAG_PERIODS);

    strategy.parameters:addGroup("Signals");
    strategy.parameters:addBoolean("ShowAlert", "Show Alert", "", true);
    strategy.parameters:addBoolean("PlaySound", "Play Sound", "", false);
    strategy.parameters:addFile("SoundFile", "Sound File", "", "");
    strategy.parameters:addBoolean("SendEmail", "Send email", "", false);
    strategy.parameters:addString("Email", "Email address", "", "");
    strategy.parameters:setFlag("Email", core.FLAG_EMAIL);
end

local tsource = nil;
local clear;
local SoundFile;

function Prepare(nameOnly)
    assert(core.indicators:findIndicator("RB_CLEAR") ~= nil, "The RB_CLEAR.LUA indicator must be downloaded and installed");

    local ShowAlert, PlaySound, SendEmail;

    ShowAlert = instance.parameters.ShowAlert;

    local PlaySound = instance.parameters.PlaySound;
    if PlaySound then
        SoundFile = instance.parameters.SoundFile;
    else
        SoundFile = nil;
    end

    assert(not(PlaySound) or (PlaySound and SoundFile ~= ""), "Sound file must be specified");

    SendEmail = instance.parameters.SendEmail;
    if SendEmail then
        Email = instance.parameters.Email;
    else
        Email = nil;
    end
    assert(not(SendEmail) or (SendEmail and Email ~= ""), "Email address must be specified");

    local name;
    name = profile:id() .. "(" .. instance.bid:instrument()  .. "[" .. instance.parameters.Period  .. "]" .. ")";
    instance:name(name);
	
	if   (nameOnly) then
        return;
    end

    ExtSetupSignal(name .. ":", ShowAlert);
    ExtSetupSignalMail(name);

    ExtSubscribe(1, nil, "t1", true, "close");
end

function ExtUpdate(id, source, period)
    if id == 1 and tsource == nil then
        tsource = ExtSubscribe(2, nil, instance.parameters.Period, instance.parameters.Type == "Bid", "bar");
        clear = core.indicators:create("RB_CLEAR", tsource);
    elseif id == 2 and period >= 1 then
        clear:update(core.UpdateLast);
        if clear.Up:hasData(period) and clear.Dn:hasData(period - 1) then
            ExtSignal(instance.bid, instance.bid:size() - 1, "Swing Up", SoundFile, Email);
        elseif clear.Dn:hasData(period) and clear.Up:hasData(period - 1) then
            ExtSignal(instance.bid, instance.bid:size() - 1, "Swing Down", SoundFile, Email);
        end
    end
end

dofile(core.app_path() .. "\\strategies\\standard\\include\\helper.lua");