/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.kalumet.console.app;

import nextapp.echo2.app.Button;
import nextapp.echo2.app.Extent;
import nextapp.echo2.app.Insets;
import nextapp.echo2.app.Label;
import nextapp.echo2.app.Row;
import nextapp.echo2.app.SplitPane;
import nextapp.echo2.app.TextArea;
import nextapp.echo2.app.WindowPane;
import nextapp.echo2.app.event.ActionEvent;
import nextapp.echo2.app.event.ActionListener;
import nextapp.echo2.app.layout.SplitPaneLayoutData;
import org.apache.kalumet.console.configuration.ConfigurationManager;
import org.apache.kalumet.model.Agent;
import org.apache.kalumet.model.Kalumet;
import org.apache.kalumet.ws.client.FileClient;

/**
 * Window displaying the content of a file.
 */
public class ViewFileWindow
    extends WindowPane
{

    private String path;

    private String agentId;

    private Label statusLabel;

    private TextArea contentArea;

    // view thread
    class ViewThread
        extends Thread
    {

        public boolean ended = false;

        public boolean failure = false;

        public String path;

        public String agentId;

        public String message;

        public void run()
        {
            try
            {
                // load Kalumet configuration
                Kalumet kalumet = ConfigurationManager.loadStore();
                // looking for the agent
                Agent agent = kalumet.getAgent( agentId );
                if ( agent == null )
                {
                    throw new IllegalArgumentException( "agent " + agentId + " not found." );
                }
                // call the WebService
                FileClient client = new FileClient( agent.getHostname(), agent.getPort() );
                message = client.view( path );
            }
            catch ( Exception e )
            {
                failure = true;
                message = "Can't view " + path + ": " + e.getMessage();
            }
            finally
            {
                ended = true;
            }
        }

    }

    // refresh
    private ActionListener refresh = new ActionListener()
    {
        public void actionPerformed( ActionEvent event )
        {
            update();
        }
    };

    /**
     * Create a window to display the content of the given file.
     *
     * @param path    the file path to display content.
     * @param agentId the agent id to use to view the file.
     */
    public ViewFileWindow( String path, String agentId )
    {
        super();

        this.path = path;
        this.agentId = agentId;

        this.setStyleName( "default" );
        this.setTitle( "View file " + path );
        this.setIcon( Styles.SCRIPT );
        this.setWidth( new Extent( 600, Extent.PX ) );
        this.setHeight( new Extent( 400, Extent.PX ) );

        // add the split pane
        SplitPane splitPane = new SplitPane( SplitPane.ORIENTATION_VERTICAL_BOTTOM_TOP, new Extent( 32 ) );
        add( splitPane );

        // add the control row
        Row controlRow = new Row();
        controlRow.setStyleName( "control" );
        splitPane.add( controlRow );

        // add the refresh button
        Button refreshButton = new Button( Messages.getString( "reload" ), Styles.DATABASE_REFRESH );
        refreshButton.setStyleName( "control" );
        refreshButton.addActionListener( refresh );
        controlRow.add( refreshButton );

        // add the close button
        Button closeButton = new Button( Messages.getString( "close" ), Styles.CROSS );
        closeButton.setStyleName( "control" );
        closeButton.addActionListener( new ActionListener()
        {
            public void actionPerformed( ActionEvent event )
            {
                ViewFileWindow.this.userClose();
            }
        } );
        controlRow.add( closeButton );

        // add the content column
        SplitPane content = new SplitPane( SplitPane.ORIENTATION_VERTICAL_TOP_BOTTOM, new Extent( 20 ) );
        splitPane.add( content );

        // add the status label
        statusLabel = new Label();
        statusLabel.setStyleName( "default" );
        SplitPaneLayoutData layoutData = new SplitPaneLayoutData();
        layoutData.setInsets( new Insets( 4 ) );
        statusLabel.setLayoutData( layoutData );
        content.add( statusLabel );

        // add the file content area
        contentArea = new TextArea();
        contentArea.setStyleName( "default" );
        contentArea.setLayoutData( layoutData );
        contentArea.setWidth( new Extent( 100, Extent.PERCENT ) );
        contentArea.setHeight( new Extent( 98, Extent.PERCENT ) );
        contentArea.setEnabled( false );
        content.add( contentArea );

        // update the pane
        update();
    }

    public void update()
    {
        statusLabel.setText( "Please wait ..." );
        statusLabel.setIcon( Styles.ERROR );

        // launch the view thread
        final ViewThread viewThread = new ViewThread();
        viewThread.agentId = agentId;
        viewThread.path = path;
        viewThread.start();

        // sync with the client
        KalumetConsoleApplication.getApplication().enqueueTask(
            KalumetConsoleApplication.getApplication().getTaskQueue(), new Runnable()
        {
            public void run()
            {
                if ( viewThread.ended )
                {
                    if ( viewThread.failure )
                    {
                        statusLabel.setText( viewThread.message );
                        statusLabel.setIcon( Styles.EXCLAMATION );
                    }
                    else
                    {
                        statusLabel.setText( "File loaded." );
                        statusLabel.setIcon( Styles.ACCEPT );
                        contentArea.setText( viewThread.message );
                    }
                }
                else
                {
                    KalumetConsoleApplication.getApplication().enqueueTask(
                        KalumetConsoleApplication.getApplication().getTaskQueue(), this );
                }
            }
        } );
    }

}