package rescuecore2.messages.components;

import static rescuecore2.misc.EncodingTools.readInt32;
import static rescuecore2.misc.EncodingTools.writeInt32;

import rescuecore2.messages.AbstractMessageComponent;
import rescuecore2.worldmodel.EntityID;

import java.io.InputStream;
import java.io.OutputStream;
import java.io.IOException;
import java.util.List;
import java.util.ArrayList;
import java.util.Collections;

/**
   A message component that is a list of entity IDs.
 */
public class EntityIDListComponent extends AbstractMessageComponent {
    private List<EntityID> ids;

    /**
       Construct an EntityIDListComponent with no data.
       @param name The name of the component.
     */
    public EntityIDListComponent(String name) {
        super(name);
        ids = new ArrayList<EntityID>();
    }

    /**
       Construct an EntityIDListComponent with a list of entity IDs.
       @param name The name of the component.
       @param ids The data.
     */
    public EntityIDListComponent(String name, List<EntityID> ids) {
        super(name);
        this.ids = new ArrayList<EntityID>(ids);
    }

    /**
       Get the list of entity IDs in this component.
       @return An immutable view of the list of entity IDs.
     */
    public List<EntityID> getIDs() {
        return Collections.unmodifiableList(ids);
    }

    /**
       Set the list of entity IDs in this component.
       @param newIDs The new set of entity IDs.
     */
    public void setIDs(List<EntityID> newIDs) {
        this.ids = new ArrayList<EntityID>(newIDs);
    }

    @Override
    public void write(OutputStream out) throws IOException {
        writeInt32(ids.size(), out);
        for (EntityID next : ids) {
            writeInt32(next.getValue(), out);
        }
    }

    @Override
    public void read(InputStream in) throws IOException {
        ids.clear();
        int count = readInt32(in);
        for (int i = 0; i < count; ++i) {
            ids.add(new EntityID(readInt32(in)));
        }
    }

    @Override
    public String toString() {
        return getName() + " = " + ids.toString();
    }
}