package textbender.a.r.page; // Copyright 2007, Michael Allan.  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Textbender Software"), to deal in the Textbender Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicence, and/or sell copies of the Textbender Software, and to permit persons to whom the Textbender Software is furnished to do so, subject to the following conditions: The preceding copyright notice and this permission notice shall be included in all copies or substantial portions of the Textbender Software. THE TEXTBENDER SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE TEXTBENDER SOFTWARE OR THE USE OR OTHER DEALINGS IN THE TEXTBENDER SOFTWARE.

import java.awt.*;
import java.beans.*;
import javax.swing.*;
import javax.swing.event.*;
import org.w3c.dom.*;
import textbender.d.gene.Gene;
import textbender.g.beans.*;
import textbender.g.hold.*;
import textbender.g.lang.*;
import textbender.g.util.logging.*;
import textbender.g.util.prefs.*;
import textbender.o.awt.*;


/** A user.
  */
public @ThreadRestricted("AWT event dispatch") final class User

    implements PropertyChangeListenerX.RegistryN, ThrowableHolderModel
{


    @ThreadSafe User( Component windowParent ) { this.windowParent = windowParent; }



   // ------------------------------------------------------------------------------------


    /** Returns the gene object of an impending user action.
      * The return value is bound to property name <tt>gene</tt>.
      *
      *     @return the gene object, or null if there is none
      *
      *     @see #setNode(Node)
      */
    public final Element getGene() { return gene; }


        private Element gene;


        private void setGene( Node newNode )
        {
            final Element oldGene = gene;
            final Element newGene = Gene.selfOrAncestorAsGene( newNode );
            gene = newGene;
            setLeafGene( newGene );
            propertyChangeSupport.firePropertyChange( "gene", oldGene, newGene );
        }



    /** Returns the leaf gene object of an impending user action.
      * The return value is bound to property name <tt>leafGene</tt>.
      *
      *     @return the leaf gene object, or null if there is none
      *
      *     @see #setNode(Node)
      */
    public final Element getLeafGene() { return leafGene; }


        private Element leafGene;


        private void setLeafGene( Element newGene )
        {
            final Element oldLeafGene = leafGene;
            final Element newLeafGene;
            {
                if( newGene == null || Gene.hasChildGene( newGene )) newLeafGene = null;
                else newLeafGene = newGene;
            }
            leafGene = newLeafGene;
            propertyChangeSupport.firePropertyChange
                ( "leafGene", oldLeafGene, newLeafGene );
        }



    /** Returns the node object of an impending user action.
      * The return value is bound to property name <tt>node</tt>.
      *
      *     @return the node object, or null if there is none
      *
      *     @see #setNode(Node)
      */
    public final Node getNode() { return node; }


        private Node node;


        /** Sets the node.
          *
          *     @see #getNode()
          */
        public final void setNode( Node newNode )
        {
            assert java.awt.EventQueue.isDispatchThread();
            final Node oldNode = node;
            node = newNode;
            setGene( newNode );
            propertyChangeSupport.firePropertyChange( "node", oldNode, newNode );
        }



   // - P r o p e r t y - L i s t e n e r - R e g i s t r y ------------------------------


    public void addPropertyChangeListener( PropertyChangeListener listener )
    {
        assert java.awt.EventQueue.isDispatchThread();
        propertyChangeSupport.addPropertyChangeListener( listener );
    }



    public void removePropertyChangeListener( PropertyChangeListener listener )
    {
        assert java.awt.EventQueue.isDispatchThread();
        propertyChangeSupport.removePropertyChangeListener( listener );
    }



   // - P r o p e r t y - L i s t e n e r - R e g i s t r y - N --------------------------


    public void addPropertyChangeListener( String propertyName, PropertyChangeListener listener )
    {
        assert java.awt.EventQueue.isDispatchThread();
        propertyChangeSupport.addPropertyChangeListener( propertyName, listener );
    }



    public void removePropertyChangeListener( String propertyName, PropertyChangeListener listener )
    {
        assert java.awt.EventQueue.isDispatchThread();
        propertyChangeSupport.removePropertyChangeListener( propertyName, listener );
    }



   // - T h r o w a b l e - H o l d e r --------------------------------------------------


    /** Returns the last throwable {@linkplain #logAndShow(Throwable) shown} to the user.
      * The return value is bound to property name 'throwable'.
      *
      *     @return last throwable shown, or null if there was none
      *         (or it was since anulled)
      */
    public @ThreadSafe synchronized final Throwable getThrowable() { return throwable; }


        private static void log( Throwable t, StackTraceElement thrower )
        {
            String throwerID = "from " + thrower.getClassName() + "."
                + thrower.getMethodName() + ", line " + thrower.getLineNumber() + ":";
            LoggerX.i(thrower.getClassName()).log( LoggerX.WARNING, /*message*/throwerID, t );
        }


        /** Logs a throwable and shows it to the user in a non-modal dialog,
          * per {@linkplain #getThrowable() getThrowable}().
          *
          *     @param newThrowable to log and show, or null
          */
        public @ThreadSafe final void logAndShow( final Throwable newThrowable )
        {
            if( newThrowable != null )
            {
                log( newThrowable, Thread.currentThread().getStackTrace()[1] ); // 1 before me
            }
            show( newThrowable );
        }


        private Throwable throwable;


        private @ThreadRestricted("AWT event dispatch") ThrowableHolderV throwableView;


        private final void show( final Throwable newThrowable )
        {
            final PropertyChangeEvent e;
            synchronized( User.this ) // atomic action + event creation
            {
                final Throwable oldThrowable = throwable;
                throwable = newThrowable;
                e = new PropertyChangeEvent
                    ( /*source*/User.this, "throwable", oldThrowable, newThrowable );
            }
            propertyChangeSupport.firePropertyChange( e );
            EventQueueX.invokeNowOrLater( new Runnable() // in AWT event dispatch thread
            {
                public final void run()
                {
                    if( throwableView == null )
                    {
                        JOptionPane optionPane = new JOptionPane();
                        {
                            optionPane.setMessageType( JOptionPane.ERROR_MESSAGE );

                            final String closeOption = "Close";
                            optionPane.setOptions( new Object[]{ closeOption });
                            optionPane.setInitialValue( closeOption );
                        }
                        throwableView = new ThrowableHolderV( optionPane, Spool0.i() ).init2
                        (
                         // /*model*/User.this, /*dialog parent*/null,
                            /*model*/User.this, windowParent,
                            PreferencesX.userNodeForClass( User.class )
                        );
//                   // throwableView.setTitle( "Error" );
                        throwableView.dialog().setModal( false );
                     // throwableView.dialog().setLocationRelativeTo( windowParent );
                     ///// sometimes on multi-head obsidian, it appears on wrong head, but this is no help
                    }
                    throwableView.dialog().setVisible( true );
                }
            });
        }



//// P r i v a t e ///////////////////////////////////////////////////////////////////////


    private final SwingPropertyChangeSupport propertyChangeSupport
        = new SwingPropertyChangeSupport( /*source bean*/User.this );



    private final Component windowParent;



}