/*
 * SIP Communicator, the OpenSource Java VoIP and Instant Messaging client.
 *
 * Distributable under LGPL license.
 * See terms of license at gnu.org.
 */
package net.java.sip.communicator.plugin.gibberishaccregwizz;

import java.util.*;

import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;

import net.java.sip.communicator.service.gui.*;
import net.java.sip.communicator.service.protocol.*;

/**
 * The <tt>FirstWizardPage</tt> is the page, where user could enter the user ID
 * and the password of the account.
 *
 * @author Emil Ivov
 */
public class FirstWizardPage
    extends JPanel implements WizardPage, DocumentListener
{

    public static final String FIRST_PAGE_IDENTIFIER = "FirstPageIdentifier";

    private JPanel userPassPanel = new JPanel(new BorderLayout(10, 10));

    private JPanel labelsPanel = new JPanel();

    private JPanel valuesPanel = new JPanel();

    private JLabel userID = new JLabel(Resources.getString("userID"));

    private JLabel passLabel = new JLabel(Resources.getString("password"));

    private JLabel existingAccountLabel
        = new JLabel(Resources.getString("existingAccount"));

    private JPanel emptyPanel = new JPanel();

    private JLabel userIDExampleLabel = new JLabel("Ex: random.user.name");

    private JTextField userIDField = new JTextField();

    private JPasswordField passField = new JPasswordField();

    private JCheckBox rememberPassBox = new JCheckBox(
        Resources.getString("rememberPassword"));

    private JPanel mainPanel = new JPanel();

    private Object nextPageIdentifier = WizardPage.SUMMARY_PAGE_IDENTIFIER;

    private GibberishAccountRegistrationWizard wizard;

    /**
     * Creates an instance of <tt>FirstWizardPage</tt>.
     * @param registration the <tt>GibberishAccountRegistration</tt>, where
     * all data through the wizard are stored
     * @param wizard the parent wizard
     */
    public FirstWizardPage(GibberishAccountRegistrationWizard wizard)
    {

        super(new BorderLayout());

        this.wizard = wizard;

        mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.Y_AXIS));

        this.init();

        this.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));

        this.labelsPanel.setLayout(new BoxLayout(labelsPanel, BoxLayout.Y_AXIS));

        this.valuesPanel.setLayout(new BoxLayout(valuesPanel, BoxLayout.Y_AXIS));
    }

    /**
     * Initializes all panels, buttons, etc.
     */
    private void init()
    {
        this.userIDField.getDocument().addDocumentListener(this);
        this.rememberPassBox.setSelected(true);

        this.existingAccountLabel.setForeground(Color.RED);

        this.userIDExampleLabel.setForeground(Color.GRAY);
        this.userIDExampleLabel.setFont(
                userIDExampleLabel.getFont().deriveFont(8));
        this.emptyPanel.setMaximumSize(new Dimension(40, 35));
        this.userIDExampleLabel.setBorder(
                BorderFactory.createEmptyBorder(0, 0, 8,0));

        labelsPanel.add(userID);
        labelsPanel.add(emptyPanel);
        labelsPanel.add(passLabel);

        valuesPanel.add(userIDField);
        valuesPanel.add(userIDExampleLabel);
        valuesPanel.add(passField);

        userPassPanel.add(labelsPanel, BorderLayout.WEST);
        userPassPanel.add(valuesPanel, BorderLayout.CENTER);
        userPassPanel.add(rememberPassBox, BorderLayout.SOUTH);

        userPassPanel.setBorder(BorderFactory
                                .createTitledBorder(Resources.getString(
                                    "userAndPassword")));

        this.add(userPassPanel, BorderLayout.NORTH);
    }

    /**
     * Implements the <code>WizardPage.getIdentifier</code> to return
     * this page identifier.
     *
     * @return the Identifier of the first page in this wizard.
     */
    public Object getIdentifier()
    {
        return FIRST_PAGE_IDENTIFIER;
    }

    /**
     * Implements the <code>WizardPage.getNextPageIdentifier</code> to return
     * the next page identifier - the summary page.
     *
     * @return the identifier of the page following this one.
     */
    public Object getNextPageIdentifier()
    {
        return nextPageIdentifier;
    }

    /**
     * Implements the <code>WizardPage.getBackPageIdentifier</code> to return
     * the next back identifier - the default page.
     *
     * @return the identifier of the default wizard page.
     */
    public Object getBackPageIdentifier()
    {
        return WizardPage.DEFAULT_PAGE_IDENTIFIER;
    }

    /**
     * Implements the <code>WizardPage.getWizardForm</code> to return
     * this panel.
     *
     * @return the component to be displayed in this wizard page.
     */
    public Object getWizardForm()
    {
        return this;
    }

    /**
     * Before this page is displayed enables or disables the "Next" wizard
     * button according to whether the UserID field is empty.
     */
    public void pageShowing()
    {
        this.setNextButtonAccordingToUserID();
    }

    /**
     * Saves the user input when the "Next" wizard buttons is clicked.
     */
    public void pageNext()
    {
        String userID = userIDField.getText();

        if (!wizard.isModification() && isExistingAccount(userID))
        {
            nextPageIdentifier = FIRST_PAGE_IDENTIFIER;
            userPassPanel.add(existingAccountLabel, BorderLayout.NORTH);
            this.revalidate();
        }
        else
        {
            nextPageIdentifier = SUMMARY_PAGE_IDENTIFIER;
            userPassPanel.remove(existingAccountLabel);

            GibberishAccountRegistration registration
                = wizard.getRegistration();

            registration.setUserID(userIDField.getText());

            if (passField.getPassword() != null)
                registration.setPassword(new String(passField.getPassword()));

            registration.setRememberPassword(rememberPassBox.isSelected());
        }
    }

    /**
     * Enables or disables the "Next" wizard button according to whether the
     * User ID field is empty.
     */
    private void setNextButtonAccordingToUserID()
    {
        if (userIDField.getText() == null || userIDField.getText().equals(""))
        {
            wizard.getWizardContainer().setNextFinishButtonEnabled(false);
        }
        else
        {
            wizard.getWizardContainer().setNextFinishButtonEnabled(true);
        }
    }

    /**
     * Handles the <tt>DocumentEvent</tt> triggered when user types in the
     * User ID field. Enables or disables the "Next" wizard button according to
     * whether the User ID field is empty.
     *
     * @param event the event containing the update.
     */
    public void insertUpdate(DocumentEvent event)
    {
        this.setNextButtonAccordingToUserID();
    }

    /**
     * Handles the <tt>DocumentEvent</tt> triggered when user deletes letters
     * from the UserID field. Enables or disables the "Next" wizard button
     * according to whether the UserID field is empty.
     *
     * @param event the event containing the update.
     */
    public void removeUpdate(DocumentEvent event)
    {
        this.setNextButtonAccordingToUserID();
    }

    public void changedUpdate(DocumentEvent event)
    {
    }

    public void pageHiding()
    {
    }

    public void pageShown()
    {
    }

    public void pageBack()
    {
    }

    /**
     * Fills the UserID and Password fields in this panel with the data comming
     * from the given protocolProvider.
     * @param protocolProvider The <tt>ProtocolProviderService</tt> to load the
     * data from.
     */
    public void loadAccount(ProtocolProviderService protocolProvider)
    {
        AccountID accountID = protocolProvider.getAccountID();
        String password = (String) accountID.getAccountProperties()
            .get(ProtocolProviderFactory.PASSWORD);

        this.userIDField.setEnabled(false);
        this.userIDField.setText(accountID.getUserID());

        if (password != null)
        {
            this.passField.setText(password);
            this.rememberPassBox.setSelected(true);
        }
    }

    /**
     * Verifies whether there is already an account installed with the same
     * details as the one that the user has just entered.
     *
     * @param userID the name of the user that the account is registered for
     * @return true if there is already an account for this userID and false
     * otherwise.
     */
    private boolean isExistingAccount(String userID)
    {
        ProtocolProviderFactory factory
            = GibberishAccRegWizzActivator.getGibberishProtocolProviderFactory();

        ArrayList registeredAccounts = factory.getRegisteredAccounts();

        for (int i = 0; i < registeredAccounts.size(); i++)
        {
            AccountID accountID = (AccountID) registeredAccounts.get(i);

            if (userID.equalsIgnoreCase(accountID.getUserID()))
            {
                return true;
            }
        }
        return false;
    }
}