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package org.netbeans.modules.ant.debugger;

import java.util.Vector;

import org.netbeans.api.debugger.Watch;
import org.netbeans.spi.debugger.ContextProvider;
import org.netbeans.spi.viewmodel.ModelEvent;
import org.netbeans.spi.viewmodel.NodeModel;
import org.netbeans.spi.viewmodel.TableModel;
import org.netbeans.spi.viewmodel.ModelListener;
import org.netbeans.spi.viewmodel.UnknownTypeException;
import org.netbeans.spi.debugger.ui.Constants;
import org.netbeans.spi.viewmodel.NodeModelFilter;
import org.openide.util.NbBundle;

/**
 *
 * @author   Jan Jancura
 */
public class WatchesModel implements NodeModelFilter, TableModel {

    public static final String WATCH =
    "org/netbeans/modules/debugger/resources/watchesView/Watch";

    private AntDebugger debugger;
    private Vector listeners = new Vector ();
    
    
    public WatchesModel (ContextProvider contextProvider) {
        debugger = (AntDebugger) contextProvider.lookupFirst 
            (null, AntDebugger.class);
        debugger.setWatchesModel(this);
    }
    
    
    // NodeModelFilter implementation ................................................
    
    /**
     * Returns display name for given node.
     *
     * @throws  ComputingException if the display name resolving process 
     *          is time consuming, and the value will be updated later
     * @throws  UnknownTypeException if this NodeModel implementation is not
     *          able to resolve display name for given node type
     * @return  display name for given node
     */
    @Override
    public String getDisplayName (NodeModel model, Object node) throws UnknownTypeException {
        return model.getDisplayName(node);
    }
    
    /**
     * Returns icon for given node.
     *
     * @throws  ComputingException if the icon resolving process 
     *          is time consuming, and the value will be updated later
     * @throws  UnknownTypeException if this NodeModel implementation is not
     *          able to resolve icon for given node type
     * @return  icon for given node
     */
    @Override
    public String getIconBase (NodeModel model, Object node) throws UnknownTypeException {
        return model.getIconBase(node);
    }
    
    /**
     * Returns tooltip for given node.
     *
     * @throws  ComputingException if the tooltip resolving process 
     *          is time consuming, and the value will be updated later
     * @throws  UnknownTypeException if this NodeModel implementation is not
     *          able to resolve tooltip for given node type
     * @return  tooltip for given node
     */
    @Override
    public String getShortDescription (NodeModel model, Object node) throws UnknownTypeException {
        if (node instanceof Watch) {
            if (!((Watch) node).isEnabled()) {
                return NbBundle.getMessage(WatchesModel.class, "CTL_WatchDisabled");
            }
            String expression = ((Watch) node).getExpression ();
            return debugger.getVariableValue (expression);
        }
        return model.getShortDescription(node);
    }
        
     
    // TableModel implementation ...............................................
    
    /**
     * Returns value to be displayed in column <code>columnID</code>
     * and row identified by <code>node</code>. Column ID is defined in by 
     * {@link ColumnModel#getID}, and rows are defined by values returned from 
     * {@link org.netbeans.spi.viewmodel.TreeModel#getChildren}.
     *
     * @param node a object returned from 
     *         {@link org.netbeans.spi.viewmodel.TreeModel#getChildren} for this row
     * @param columnID a id of column defined by {@link ColumnModel#getID}
     * @throws ComputingException if the value is not known yet and will 
     *         be computed later
     * @throws UnknownTypeException if there is no TableModel defined for given
     *         parameter type
     *
     * @return value of variable representing given position in tree table.
     */
    @Override
    public Object getValueAt (Object node, String columnID) throws 
    UnknownTypeException {
        if (columnID == Constants.WATCH_TO_STRING_COLUMN_ID ||
            columnID == Constants.WATCH_VALUE_COLUMN_ID
        ) {
            if (node instanceof Watch) {
                if (!((Watch) node).isEnabled()) {
                    return NbBundle.getMessage(WatchesModel.class, "CTL_WatchDisabled");
                }
                String expression = ((Watch) node).getExpression ();
                return debugger.getVariableValue (expression);
            }
        }
        if (columnID == Constants.WATCH_TYPE_COLUMN_ID &&
            node instanceof Watch
        )
            return "";
        throw new UnknownTypeException (node);
    }
    
    /**
     * Returns true if value displayed in column <code>columnID</code>
     * and row <code>node</code> is read only. Column ID is defined in by 
     * {@link ColumnModel#getID}, and rows are defined by values returned from 
     * {@link TreeModel#getChildren}.
     *
     * @param node a object returned from {@link TreeModel#getChildren} for this row
     * @param columnID a id of column defined by {@link ColumnModel#getID}
     * @throws UnknownTypeException if there is no TableModel defined for given
     *         parameter type
     *
     * @return true if variable on given position is read only
     */
    @Override
    public boolean isReadOnly (Object node, String columnID) throws 
    UnknownTypeException {
        if (columnID == Constants.WATCH_TO_STRING_COLUMN_ID ||
            columnID == Constants.WATCH_VALUE_COLUMN_ID ||
            columnID == Constants.WATCH_TYPE_COLUMN_ID
        ) {
            if (node instanceof Watch)
                return true;
        }
        throw new UnknownTypeException (node);
    }
    
    /**
     * Changes a value displayed in column <code>columnID</code>
     * and row <code>node</code>. Column ID is defined in by 
     * {@link ColumnModel#getID}, and rows are defined by values returned from 
     * {@link TreeModel#getChildren}.
     *
     * @param node a object returned from {@link TreeModel#getChildren} for this row
     * @param columnID a id of column defined by {@link ColumnModel#getID}
     * @param value a new value of variable on given position
     * @throws UnknownTypeException if there is no TableModel defined for given
     *         parameter type
     */
    @Override
    public void setValueAt (Object node, String columnID, Object value) 
    throws UnknownTypeException {
        throw new UnknownTypeException (node);
    }
        
     
    /** 
     * Registers given listener.
     * 
     * @param l the listener to add
     */
    @Override
    public void addModelListener (ModelListener l) {
        listeners.add (l);
    }

    /** 
     * Unregisters given listener.
     *
     * @param l the listener to remove
     */
    @Override
    public void removeModelListener (ModelListener l) {
        listeners.remove (l);
    }

    
    // other mothods ...........................................................

    void fireChanges () {
        Vector v = (Vector) listeners.clone ();
        int i, k = v.size ();
        for (i = 0; i < k; i++)
            ((ModelListener) v.get (i)).modelChanged (
                new ModelEvent.TreeChanged (this)
            );
    }
    
}
