-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=31&t=65680

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local Modules = {};

function Init()
    strategy:name("Conjure Strategy");
    strategy:description("");

    strategy.parameters:addBoolean("is_buy", "Is Buy", "", true);
    strategy.parameters:addDouble("step", "Step", "", 50);
    strategy.parameters:addBoolean("AllowTrade", "Allow strategy to trade", "", true);   
    strategy.parameters:setFlag("AllowTrade", core.FLAG_ALLOW_TRADE);
    strategy.parameters:addString("Account", "Account to trade on", "", "");
    strategy.parameters:setFlag("Account", core.FLAG_ACCOUNT);
    strategy.parameters:addInteger("Amount", "Trade Amount in Lots", "", 1, 1, 100);
end

local is_buy;
local step;
local AllowTrade;
local Account;
local Amount;
local Offer;

function Prepare(name_only)
    for _, module in pairs(Modules) do module:Prepare(nameOnly); end
    instance:name(profile:id() .. "(" .. instance.bid:name() ..  ")");
    if name_only then return ; end

    is_buy = instance.parameters.is_buy;
    step = instance.parameters.step * instance.bid:pipSize();
    AllowTrade = instance.parameters.AllowTrade;
    Account = instance.parameters.Account;
    Amount = instance.parameters.Amount;
    BaseSize = core.host:execute("getTradingProperty", "baseUnitSize", instance.bid:instrument(), Account);
    Offer = core.host:findTable("offers"):find("Instrument", instance.bid:instrument()).OfferID;

    ExtSubscribe(1, nil, "t1", not is_buy, "tick");
end

local initial_price;
function ExtUpdate(id, source, period)
    if initial_price == nil then
        initial_price = source:tick(NOW);
    end
    if is_buy then
        if source:tick(NOW) - initial_price >= step then
            initial_price = initial_price + step;
            MarketOrder("B");
        end
    else
        if initial_price - source:tick(NOW) >= step then
            initial_price = initial_price - step;
            MarketOrder("S");
        end
    end
    local account = core.host:findTable("accounts"):find("AccountID", Account);
    local mmr = core.host:execute("getTradingProperty", "MMR", instance.bid:instrument(), Account);
    local emr = core.host:execute("getTradingProperty", "EMR", instance.bid:instrument(), Account);
    local margin_needed = math.max(emr, mmr) * Amount;
    if account.UsedMargin >= account.Balance or account.UsableMargin < margin_needed then
        local offer_id = core.host:findTable("offers"):find("Instrument", instance.source:instrument()).OfferID;
        CloseAll(offer_id, Account, "B");
        CloseAll(offer_id, Account, "S");
    end
end

function CloseAll(offer_id, account_id, bs)
    local valuemap;
    valuemap = core.valuemap();
    valuemap.Command = "CreateOrder";
    valuemap.OrderType = "CM";
    valuemap.OfferID = offer_id;
    valuemap.BuySell = bs;
    valuemap.AcctID = account_id;
    valuemap.NetQtyFlag = "y";
    local success, msg;
    success, msg = terminal:execute(100, valuemap);
    assert(success, msg);
end

function MarketOrder(BuySell)
    local valuemap = core.valuemap();
    valuemap.Command = "CreateOrder";
    valuemap.OrderType = "OM";
    valuemap.OfferID = Offer;
    valuemap.AcctID = Account;
    valuemap.Quantity = Amount * BaseSize;
    valuemap.BuySell = BuySell;

    local success, msg = terminal:execute(200, valuemap);
    if not(success) then
        terminal:alertMessage(instance.bid:instrument(), instance.bid[NOW], "Open order failed" .. msg, instance.bid:date(NOW));
        return false;
    end

    return true;
end

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