package com.metaweb.gridworks.model;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.Serializable;
import java.util.LinkedList;
import java.util.List;
import java.util.Properties;

import org.json.JSONException;
import org.json.JSONWriter;

import com.metaweb.gridworks.Jsonizable;

public class ColumnGroup implements Serializable, Jsonizable {
    private static final long serialVersionUID = 2161780779920066118L;

    final public int     startColumnIndex;
    final public int    columnSpan;
    final public int    keyColumnIndex; // could be -1 if there is no key cell 
    
    transient public ColumnGroup        parentGroup;
    transient public List<ColumnGroup>     subgroups;
    
    public ColumnGroup(int startColumnIndex, int columnSpan, int keyColumnIndex) {
        this.startColumnIndex = startColumnIndex;
        this.columnSpan = columnSpan;
        this.keyColumnIndex = keyColumnIndex;
        internalInitialize();
    }
    
    public void write(JSONWriter writer, Properties options)
            throws JSONException {
        
        writer.object();
        
        writer.key("startColumnIndex"); writer.value(startColumnIndex);
        writer.key("columnSpan"); writer.value(columnSpan);
        writer.key("keyColumnIndex"); writer.value(keyColumnIndex);
        
        if (subgroups != null && subgroups.size() > 0) {
            writer.key("subgroups"); writer.array();
            for (ColumnGroup g : subgroups) {
                g.write(writer, options);
            }
            writer.endArray();
        }
        
        writer.endObject();
    }
    
    public boolean contains(ColumnGroup g) {
        return (g.startColumnIndex >= startColumnIndex &&
            g.startColumnIndex < startColumnIndex + columnSpan);
    }
    
    private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
        in.defaultReadObject();
        internalInitialize();
    }
    
    protected void internalInitialize() {
        subgroups = new LinkedList<ColumnGroup>();
    }
}