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package org.jvirtanen.parity.match;

import java.util.ArrayList;

class Level {

    private Orders parent;

    private long price;

    private ArrayList orders;

    private ArrayList toDelete;

    public Level(Orders parent, long price) {
        this.parent   = parent;
        this.price    = price;
        this.orders   = new ArrayList<>();
        this.toDelete = new ArrayList<>();
    }

    public long getPrice() {
        return price;
    }

    public Order add(long orderId, long size) {
        Order order = new Order(this, orderId, size);

        orders.add(order);

        return order;
    }

    public long match(long orderId, Side side, long quantity, MarketListener listener) {
        for (int i = 0; quantity > 0 && i < orders.size(); i++) {
            Order order = orders.get(i);

            long orderQuantity = order.getRemainingQuantity();

            if (orderQuantity > quantity) {
                order.reduce(quantity);

                listener.match(order.getId(), orderId, side, price, quantity, order.getRemainingQuantity());

                quantity = 0;
            } else {
                toDelete.add(order);

                listener.match(order.getId(), orderId, side, price, orderQuantity, 0);

                quantity -= orderQuantity;
            }
        }

        if (!toDelete.isEmpty()) {
            for (int i = 0; i < toDelete.size(); i++)
                toDelete.get(i).delete();

            toDelete.clear();
        }

        return quantity;
    }

    public void delete(Order order) {
        orders.remove(order);

        if (orders.isEmpty())
            parent.delete(this);
    }

}