package com.c2kernel.lifecycle.instance.gui.view;

import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.Box;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JLabel;
import javax.swing.JOptionPane;

import com.c2kernel.entity.agent.Job;
import com.c2kernel.entity.proxy.ItemProxy;
import com.c2kernel.graph.model.Vertex;
import com.c2kernel.graph.view.SelectedVertexPanel;
import com.c2kernel.gui.MainFrame;
import com.c2kernel.gui.tabs.EntityTabPane;
import com.c2kernel.gui.tabs.execution.Executor;
import com.c2kernel.lifecycle.instance.Activity;
import com.c2kernel.lifecycle.instance.stateMachine.StateMachine;
import com.c2kernel.lifecycle.instance.stateMachine.States;
import com.c2kernel.lifecycle.instance.stateMachine.Transitions;
import com.c2kernel.utils.Logger;

/**************************************************************************
 *
 * $Revision: 1.8 $
 * $Date: 2005/09/07 13:46:31 $
 *
 * Copyright (C) 2003 CERN - European Organization for Nuclear Research
 * All rights reserved.
 **************************************************************************/

public class TransitionPanel extends SelectedVertexPanel implements ActionListener {
    protected Activity mCurrentAct;
    protected GridBagLayout gridbag;
    protected GridBagConstraints c;
    protected Box transBox;
    protected JComboBox executors;
    protected JComboBox states = new JComboBox(States.states);
    protected JCheckBox active = new JCheckBox();
    protected JLabel status = new JLabel();
    protected ItemProxy mItem;

    public TransitionPanel() {
        super();
        gridbag = new GridBagLayout();
        setLayout(gridbag);
        c = new GridBagConstraints();
        c.gridx=0; c.gridy=0;
        c.weightx=1; c.weighty=0;
        c.fill=GridBagConstraints.HORIZONTAL;

        JLabel title = new JLabel("Available Transitions");
        title.setFont(EntityTabPane.titleFont);
        gridbag.setConstraints(title, c);
        add(title);

        c.gridy++;
        gridbag.setConstraints(status, c);
        add(status);
        c.gridy++;

        transBox = Box.createHorizontalBox();
        gridbag.setConstraints(transBox, c);
        add(transBox);

        c.weightx=0; c.gridx++;
        executors = MainFrame.getExecutionPlugins();
        if (executors.getItemCount() > 1) {
            gridbag.setConstraints(executors, c);
            add(executors);
        }



        if (MainFrame.isAdmin) {
            c.gridx=0; c.gridy++;
            title = new JLabel("State Hacking");
            title.setFont(EntityTabPane.titleFont);
            gridbag.setConstraints(title, c);
            add(title);
        	Box hackBox = Box.createHorizontalBox();
        	hackBox.add(states);
        	hackBox.add(Box.createHorizontalGlue());
        	hackBox.add(new JLabel("Active:"));
        	hackBox.add(active);
        	c.gridy++;
            gridbag.setConstraints(hackBox, c);
            add(hackBox);
            states.addActionListener(this);
            active.addActionListener(this);
        }

        clear();

    }
    /**
     *
     */
    @Override
	public void select(Vertex vert) {
	    clear();
	    if (!(vert instanceof Activity)) return;
        mCurrentAct = (Activity)vert;
        states.setSelectedIndex(mCurrentAct.getCurrentState());
        states.setEnabled(true);
        active.setSelected(mCurrentAct.active);
        active.setEnabled(true);
        Logger.msg("Retrieving possible transitions for activity "+mCurrentAct.getName());
        int[] transitions = mCurrentAct.getMachine().possibleTransition();
        if (transitions.length == 0) {
            status.setText("None");
            return;
        }
        for (int i = 0; i < transitions.length; i++) {
        	String trans= Transitions.getTransitionName(transitions[i]);
            if (!(transitions[i]==Transitions.DONE) && !(transitions[i]==Transitions.COMPLETE)) {
                String buttonLabel = trans.substring(0,1).toUpperCase()+trans.substring(1);
                JButton thisTrans = new JButton(buttonLabel);
                thisTrans.setActionCommand("Trans:"+String.valueOf(transitions[i]));
                thisTrans.addActionListener(this);
                transBox.add(thisTrans);
                transBox.add(Box.createHorizontalGlue());
            }
            status.setText(transitions.length+" transitions possible.");
        }
        revalidate();
    }

    @Override
	public void actionPerformed(ActionEvent e) {
    	if (e.getSource() == active && mCurrentAct != null) {
    		mCurrentAct.active = active.isSelected();
    		return;
    	}
    	if (e.getSource() == states && mCurrentAct != null) {
    		mCurrentAct.getMachine().state = states.getSelectedIndex();
    		return;
    	}
    	if (!e.getActionCommand().startsWith("Trans:")) return;
        int transition = Integer.parseInt(e.getActionCommand().substring(6));
        Logger.msg("Requesting transition "+transition);
        Job thisJob = new Job(mItem.getSystemKey(),
                            mCurrentAct.getPath(),
                            transition,
                            new StateMachine(mCurrentAct).simulate(transition),
                            mCurrentAct.getCurrentState(),
                            mCurrentAct.getName(),
                            mCurrentAct.getProperties(),
                            mCurrentAct.getType(),
                            MainFrame.userAgent.getName());
        try {
            Executor selectedExecutor = (Executor)executors.getSelectedItem();
            selectedExecutor.execute(thisJob, status);
        } catch (Exception ex) {
            String className = ex.getClass().getName();
            className = className.substring(className.lastIndexOf('.')+1);
            Logger.error(ex);
            JOptionPane.showMessageDialog(null, ex.getMessage(), className, JOptionPane.ERROR_MESSAGE);
        }

    }

    @Override
	public void clear() {
    	mCurrentAct = null;
        transBox.removeAll();
        status.setText("No activity selected");
        states.setSelectedIndex(0);
        states.setEnabled(false);
        active.setSelected(false);
        active.setEnabled(false);
        revalidate();
    }


    /**
     * @param item The mItem to set.
     */
    public void setItem(ItemProxy item) {
        mItem = item;
    }
}