package com.nexes.wizard;

import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.util.HashMap;
import java.util.Map;

import javax.swing.Icon;

/**
 * The model for the Wizard component, which tracks the text, icons, and enabled state
 * of each of the buttons, as well as the current panel that is displayed. Note that
 * the model, in its current form, is not intended to be subclassed.
 */


public class WizardModel {

    /**
     * Identification string for the current panel.
     */
    public static final String CURRENT_PANEL_DESCRIPTOR_PROPERTY = "currentPanelDescriptorProperty";

    /**
     * Property identification String for the Back button's text
     */
    public static final String BACK_BUTTON_TEXT_PROPERTY = "backButtonTextProperty";
    /**
     * Property identification String for the Back button's icon
     */
    public static final String BACK_BUTTON_ICON_PROPERTY = "backButtonIconProperty";
    /**
     * Property identification String for the Back button's enabled state
     */
    public static final String BACK_BUTTON_ENABLED_PROPERTY = "backButtonEnabledProperty";

    /**
     * Property identification String for the Next button's text
     */
    public static final String NEXT_FINISH_BUTTON_TEXT_PROPERTY = "nextButtonTextProperty";
    /**
     * Property identification String for the Next button's icon
     */
    public static final String NEXT_FINISH_BUTTON_ICON_PROPERTY = "nextButtonIconProperty";
    /**
     * Property identification String for the Next button's enabled state
     */
    public static final String NEXT_FINISH_BUTTON_ENABLED_PROPERTY = "nextButtonEnabledProperty";

    /**
     * Property identification String for the Cancel button's text
     */
    public static final String CANCEL_BUTTON_TEXT_PROPERTY = "cancelButtonTextProperty";
    /**
     * Property identification String for the Cancel button's icon
     */
    public static final String CANCEL_BUTTON_ICON_PROPERTY = "cancelButtonIconProperty";
    /**
     * Property identification String for the Cancel button's enabled state
     */
    public static final String CANCEL_BUTTON_ENABLED_PROPERTY = "cancelButtonEnabledProperty";

    private WizardPanelDescriptor currentPanel;

    private Map<Object, WizardPanelDescriptor> panelHashmap;

    private Map<Object, Object> buttonTextHashmap;
    private Map<Object, Icon> buttonIconHashmap;
    private Map<Object, Boolean> buttonEnabledHashmap;

    private PropertyChangeSupport propertyChangeSupport;


    /**
     * Default constructor.
     */
    public WizardModel() {

        panelHashmap = new HashMap<Object, WizardPanelDescriptor>();

        buttonTextHashmap = new HashMap<Object, Object>();
        buttonIconHashmap = new HashMap<Object, Icon>();
        buttonEnabledHashmap = new HashMap<Object, Boolean>();

        propertyChangeSupport = new PropertyChangeSupport(this);

    }

    /**
     * Returns the currently displayed WizardPanelDescriptor.
     * @return The currently displayed WizardPanelDescriptor
     */
    WizardPanelDescriptor getCurrentPanelDescriptor() {
        return currentPanel;
    }

    /**
     * Registers the WizardPanelDescriptor in the model using the Object-identifier specified.
     * @param id Object-based identifier
     * @param descriptor WizardPanelDescriptor that describes the panel
     */
     void registerPanel(Object id, WizardPanelDescriptor descriptor) {

        //  Place a reference to it in a hashtable so we can access it later
        //  when it is about to be displayed.

        panelHashmap.put(id, descriptor);

    }

    /**
     * Sets the current panel to that identified by the Object passed in.
     * @param id Object-based panel identifier
     * @return boolean indicating success or failure
     */
     boolean setCurrentPanel(Object id) {

        //  First, get the hashtable reference to the panel that should
        //  be displayed.

        WizardPanelDescriptor nextPanel =
            (WizardPanelDescriptor)panelHashmap.get(id);

        //  If we couldn't find the panel that should be displayed, return
        //  false.

        if (nextPanel == null)
            throw new WizardPanelNotFoundException();

        WizardPanelDescriptor oldPanel = currentPanel;
        currentPanel = nextPanel;

        if (oldPanel != currentPanel)
            firePropertyChange(CURRENT_PANEL_DESCRIPTOR_PROPERTY, oldPanel, currentPanel);

        return true;

    }

    Object getBackButtonText() {
        return buttonTextHashmap.get(BACK_BUTTON_TEXT_PROPERTY);
    }

    void setBackButtonText(Object newText) {

        Object oldText = getBackButtonText();
        if (!newText.equals(oldText)) {
            buttonTextHashmap.put(BACK_BUTTON_TEXT_PROPERTY, newText);
            firePropertyChange(BACK_BUTTON_TEXT_PROPERTY, oldText, newText);
        }
    }

    Object getNextFinishButtonText() {
        return buttonTextHashmap.get(NEXT_FINISH_BUTTON_TEXT_PROPERTY);
    }

    void setNextFinishButtonText(Object newText) {

        Object oldText = getNextFinishButtonText();
        if (!newText.equals(oldText)) {
            buttonTextHashmap.put(NEXT_FINISH_BUTTON_TEXT_PROPERTY, newText);
            firePropertyChange(NEXT_FINISH_BUTTON_TEXT_PROPERTY, oldText, newText);
        }
    }

    Object getCancelButtonText() {
        return buttonTextHashmap.get(CANCEL_BUTTON_TEXT_PROPERTY);
    }

    void setCancelButtonText(Object newText) {

        Object oldText = getCancelButtonText();
        if (!newText.equals(oldText)) {
            buttonTextHashmap.put(CANCEL_BUTTON_TEXT_PROPERTY, newText);
            firePropertyChange(CANCEL_BUTTON_TEXT_PROPERTY, oldText, newText);
        }
    }

    Icon getBackButtonIcon() {
        return buttonIconHashmap.get(BACK_BUTTON_ICON_PROPERTY);
    }

    void setBackButtonIcon(Icon newIcon) {

        Object oldIcon = getBackButtonIcon();
        if (!newIcon.equals(oldIcon)) {
            buttonIconHashmap.put(BACK_BUTTON_ICON_PROPERTY, newIcon);
            firePropertyChange(BACK_BUTTON_ICON_PROPERTY, oldIcon, newIcon);
        }
    }

    Icon getNextFinishButtonIcon() {
        return (Icon)buttonIconHashmap.get(NEXT_FINISH_BUTTON_ICON_PROPERTY);
    }

    public void setNextFinishButtonIcon(Icon newIcon) {

        Object oldIcon = getNextFinishButtonIcon();
        if (!newIcon.equals(oldIcon)) {
            buttonIconHashmap.put(NEXT_FINISH_BUTTON_ICON_PROPERTY, newIcon);
            firePropertyChange(NEXT_FINISH_BUTTON_ICON_PROPERTY, oldIcon, newIcon);
        }
    }

    Icon getCancelButtonIcon() {
        return (Icon)buttonIconHashmap.get(CANCEL_BUTTON_ICON_PROPERTY);
    }

    void setCancelButtonIcon(Icon newIcon) {

        Icon oldIcon = getCancelButtonIcon();
        if (!newIcon.equals(oldIcon)) {
            buttonIconHashmap.put(CANCEL_BUTTON_ICON_PROPERTY, newIcon);
            firePropertyChange(CANCEL_BUTTON_ICON_PROPERTY, oldIcon, newIcon);
        }
    }


    Boolean getBackButtonEnabled() {
        return buttonEnabledHashmap.get(BACK_BUTTON_ENABLED_PROPERTY);
    }

    void setBackButtonEnabled(Boolean newValue) {

        Boolean oldValue = getBackButtonEnabled();
        if (newValue != oldValue) {
            buttonEnabledHashmap.put(BACK_BUTTON_ENABLED_PROPERTY, newValue);
            firePropertyChange(BACK_BUTTON_ENABLED_PROPERTY, oldValue, newValue);
        }
    }

    Boolean getNextFinishButtonEnabled() {
        return buttonEnabledHashmap.get(NEXT_FINISH_BUTTON_ENABLED_PROPERTY);
    }

    void setNextFinishButtonEnabled(Boolean newValue) {

        Boolean oldValue = getNextFinishButtonEnabled();
        if (newValue != oldValue) {
            buttonEnabledHashmap.put(NEXT_FINISH_BUTTON_ENABLED_PROPERTY, newValue);
            firePropertyChange(NEXT_FINISH_BUTTON_ENABLED_PROPERTY, oldValue, newValue);
        }
    }

    Boolean getCancelButtonEnabled() {
        return buttonEnabledHashmap.get(CANCEL_BUTTON_ENABLED_PROPERTY);
    }

    void setCancelButtonEnabled(Boolean newValue) {

        Boolean oldValue = getCancelButtonEnabled();
        if (newValue != oldValue) {
            buttonEnabledHashmap.put(CANCEL_BUTTON_ENABLED_PROPERTY, newValue);
            firePropertyChange(CANCEL_BUTTON_ENABLED_PROPERTY, oldValue, newValue);
        }
    }



    public void addPropertyChangeListener(PropertyChangeListener p) {
        propertyChangeSupport.addPropertyChangeListener(p);
    }

    public void removePropertyChangeListener(PropertyChangeListener p) {
        propertyChangeSupport.removePropertyChangeListener(p);
    }

    protected void firePropertyChange(String propertyName, Object oldValue, Object newValue) {
        propertyChangeSupport.firePropertyChange(propertyName, oldValue, newValue);
    }

}