import java.util.Stack;

import com.dukascopy.api.Configurable;
import com.dukascopy.api.Filter;
import com.dukascopy.api.IAccount;
import com.dukascopy.api.IBar;
import com.dukascopy.api.IConsole;
import com.dukascopy.api.IContext;
import com.dukascopy.api.IEngine;
import com.dukascopy.api.IEngine.OrderCommand;
import com.dukascopy.api.IMessage;
import com.dukascopy.api.IOrder;
import com.dukascopy.api.IStrategy;
import com.dukascopy.api.ITick;
import com.dukascopy.api.Instrument;
import com.dukascopy.api.JFException;
import com.dukascopy.api.OfferSide;
import com.dukascopy.api.Period;

public class Grider_cleaned implements IStrategy {

    private IEngine engine;
    private IConsole console;
    private int counter = 0;
    private Stack<IOrder> buyOrdrs = new Stack<IOrder>();
    private Stack<IOrder> sellOrdrs = new Stack<IOrder>();
    @Configurable("Step pips")
    public double step = 20;
    @Configurable("Instrument")
    public Instrument instrument = Instrument.EURUSD;
    @Configurable("Period")
    public Period selectedPeriod = Period.TEN_MINS;
    @Configurable("Offer side")
    public OfferSide offerSide = OfferSide.BID;
    @Configurable("Slippage")
    public double slippage = 0;
    @Configurable("Amount")
    public double amount = 0.02;
    
    public Filter filter = Filter.ALL_FLATS;

    private ITick previousTick = null;

    @Override
    public void onStart(IContext context) throws JFException {
        this.console = context.getConsole();
        context.getHistory();
        this.engine = context.getEngine();
    }

    @Override
    public void onBar(Instrument instrument, Period period, IBar askBar, IBar bidBar) throws JFException {
        if (period != this.selectedPeriod || instrument != this.instrument) {
            return;
        }
    }

    public void onTick(Instrument instrument, ITick tick) throws JFException {
        if (instrument != this.instrument) {
            return;
        }

        if (previousTick == null) {
            previousTick = tick;
            return;
        }

        if (tick.getBid() >= previousTick.getBid() + getPipPrice(step)) {
            if (!buyOrdrs.isEmpty()) {
                closeOrder(buyOrdrs.pop());
            }
            else {
                sellOrdrs.push(submitOrder(OrderCommand.SELL, instrument));
            }
            previousTick = tick;

        } else if (tick.getAsk() <= previousTick.getAsk() - getPipPrice(step)) {
            if (!sellOrdrs.isEmpty()) {
                closeOrder(sellOrdrs.pop());
            }
            else {
                buyOrdrs.push(submitOrder(OrderCommand.BUY, instrument));
            }
            previousTick = tick;
        }
    }

    private IOrder submitOrder(OrderCommand orderCmd, Instrument instr) throws JFException {

        return engine.submitOrder(getLabel(instr), instr, orderCmd, amount, 0, slippage);
    }

    private void closeOrder(IOrder order) throws JFException {
        if (order != null && isActive(order)) {
            order.close();
        }
    }

    private boolean isActive(IOrder order) throws JFException {
        if (order != null && order.getState() != IOrder.State.CLOSED && order.getState() != IOrder.State.CREATED && order.getState() != IOrder.State.CANCELED) {
            return true;
        }
        return false;
    }

    private double getPipPrice(double pips) {
        return pips * this.instrument.getPipValue();
    }

    private String getLabel(Instrument instrument) {
        String label = instrument.name();
        label = label + (counter++);
        label = label.toUpperCase();
        return label;
    }

    public void onMessage(IMessage message) throws JFException {
        print(message);
    }

    public void onAccount(IAccount account) throws JFException {
    }

    public void onStop() throws JFException {
    }

    private void print(Object o) {
        console.getOut().println(o);
    }
}