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/* The contents of this file are subject to the license and copyright terms
 * detailed in the license directory at the root of the source tree (also 
 * available online at http://fedora-commons.org/license/).
 */
package org.fcrepo.client.console;

import java.awt.BorderLayout;

import java.io.PrintWriter;
import java.io.StringWriter;

import java.lang.reflect.Array;
import java.lang.reflect.InvocationTargetException;

import java.util.Date;

import javax.swing.BoxLayout;
import javax.swing.JLabel;
import javax.swing.JPanel;

/**
 * @author Chris Wilper
 */
public class ConsoleCommandInvoker
        extends JPanel {

    private static final long serialVersionUID = 1L;

    private final ConsoleCommand m_command;

    private final Console m_console;

    private final InputPanel[] m_inputPanels;

    public ConsoleCommandInvoker(ConsoleCommand command, Console console) {
        m_command = command;
        m_console = console;
        setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
        JLabel commandNameLabel = new JLabel("Command: " + m_command.getName());
        JPanel jeez = new JPanel();
        jeez.setLayout(new BorderLayout());
        jeez.add(commandNameLabel, BorderLayout.WEST);
        add(jeez);
        Class types[] = command.getParameterTypes();
        String names[] = command.getParameterNames();
        m_inputPanels = new InputPanel[types.length];
        for (int i = 0; i < types.length; i++) {
            JPanel typeNameInputPanel = new JPanel();
            typeNameInputPanel.setLayout(new BorderLayout());
            typeNameInputPanel
                    .add(new JLabel(names[i] + " ("
                                 + command.getUnqualifiedName(types[i])
                                 + ") : "),
                         BorderLayout.WEST);
            m_inputPanels[i] = InputPanelFactory.getPanel(types[i]);
            typeNameInputPanel.add(m_inputPanels[i]);
            add(typeNameInputPanel);
        }
        JLabel returnTypeLabel =
                new JLabel("Returns: "
                        + m_command.getUnqualifiedName(m_command
                                .getReturnType()));
        JPanel jeez2 = new JPanel();
        jeez2.setLayout(new BorderLayout());
        jeez2.add(returnTypeLabel, BorderLayout.WEST);
        add(jeez2);
    }

    /**
     * Invokes the console command with whatever parameters have been set thus
     * far, sending any errors to the console.
     */
    public void invoke() {
        try {
            m_console.setBusy(true);
            m_console.print("Invoking " + m_command.toString() + "\n");
            Object[] parameters =
                    new Object[m_command.getParameterTypes().length];
            if (m_command.getParameterTypes().length > 0) {
                for (int i = 0; i < m_command.getParameterTypes().length; i++) {
                    m_console.print(m_command.getParameterNames()[i]);
                    m_console.print("=");
                    Object paramValue = m_inputPanels[i].getValue();
                    parameters[i] = paramValue;
                    if (paramValue == null) {
                        m_console.print("");
                    } else {
                        m_console.print(stringify(paramValue));
                    }
                    m_console.print("\n");
                }
            }
            long startms = new Date().getTime();
            Object returned =
                    m_command.invoke(m_console.getInvocationTarget(m_command),
                                     parameters);
            long endms = new Date().getTime();
            long totalms = endms - startms;
            if (returned != null) {
                m_console.print("Returned: " + stringify(returned) + "\n");
            } else {
                if (m_command.getReturnType() == null) {
                    m_console.print("Returned.\n");
                } else {
                    m_console.print("Returned: \n");
                }
            }
            String duration;
            if (totalms == 0) {
                duration = "< 0.001 seconds.";
            } else {
                double secs = totalms / 1000.0;
                duration = secs + " seconds.";
            }
            m_console.print("Roundtrip time: ");
            m_console.print(duration);
            m_console.print("\n");
        } catch (InvocationTargetException ite) {
            m_console.print("ERROR ("
                    + ite.getTargetException().getClass().getName() + ") : "
                    + ite.getTargetException().getMessage() + "\n");
        } catch (Throwable th) {
            m_console.print("ERROR (" + th.getClass().getName() + ") : "
                    + th.getMessage() + "\n");
            StringWriter sw = new StringWriter();
            th.printStackTrace(new PrintWriter(sw));
            m_console.print(sw.toString());
        } finally {
            m_console.setBusy(false);
        }
    }

    private String stringify(Object obj) {
        if (obj == null) {
            return "";
        }
        String nm = obj.getClass().getName();
        if (nm.startsWith("[L")) {
            // print array
            StringBuffer buf = new StringBuffer();
            buf.append("{");
            for (int i = 0; i < Array.getLength(obj); i++) {
                if (i > 0) {
                    buf.append(",");
                }
                buf.append(Array.get(obj, i).toString());
            }
            buf.append("}");
            return buf.toString();
        }
        return obj.toString();
    }

}