import java.util.List;
import java.util.Map;

public interface IChannelNode extends Comparable<IChannelNode> {
    enum Direction {
        INCOMING(0),   // Users incoming from outside channel (aka: other channel forwarded this channel's post)
        OUTGOING(1),   // Users outgoing from this channel (aka: this channel forwarded someone else's post)
        BOTH(2);       // Modify both incoming and outgoing counts at once

        private final int val;
        Direction(int val) {this.val = val;}
        public int getVal() {return this.val;}
    }

    void setConnections(Map<IChannelNode, Integer> conmap, Direction dir);
    void setNumConnections(IChannelNode node, Direction dir, int num);
    void addConnection(IChannelNode node, Direction dir);
    void addConnections(Iterable<IChannelNode> nodes, Direction dir);
    void removeConnection(IChannelNode node, Direction dir);
    void removeConnections(Iterable<IChannelNode> nodes, Direction dir);
    void clearConnections(Direction dir);

    boolean connectionExists(IChannelNode node, Direction dir);
    int getNumConnections(Direction dir);
    Map<IChannelNode, Integer> getIncomingConnections();
    Map<IChannelNode, Integer> getOutgoingConnections();
    List<Map<IChannelNode, Integer>> getConnections(Direction dir);
}