// This Source Code is in the Public Domain per: http://unlicense.org
package org.litesoft.GWT.client;

import org.litesoft.GWT.client.widgets.*;
import org.litesoft.GWT.client.widgets.nonpublic.*;
import org.litesoft.commonfoundation.typeutils.*;
import org.litesoft.commonfoundation.typeutils.gregorian.*;
import org.litesoft.logger.*;

import com.google.gwt.core.client.*;
import com.google.gwt.event.logical.shared.*;
import com.google.gwt.user.client.*;
import com.google.gwt.user.client.ui.*;

public abstract class AbstractClientMainAppEntryPoint implements EntryPoint,
                                                                 AppWindowLifeCycle,
                                                                 DataTableStyle
{
    /**
     * @noinspection NonJREEmulationClassesInClientCode
     */
    public static Logger CLIENT_LOGGER = LoggerFactory.getLogger( "Client" );

    public static boolean sWindowClosing = false;

    /**
     * @noinspection NonJREEmulationClassesInClientCode
     */
    public static final Logger ENTRY_POINT_LOGGER = LoggerFactory.getLogger( EntryPoint.class );

    protected final String mAppName;
    protected final String mShortAllLettersClientName;
    private static final String APP_PANEL = "AppPanel";

    protected AbstractClientMainAppEntryPoint( AppNames pAppNames )
    {
        mAppName = pAppNames.getAppName();
        mShortAllLettersClientName = pAppNames.getShortAllLettersClientName();
    }

    /**
     * This is the entry point method.
     */
    @Override
    public final void onModuleLoad()
    {
        System.err.println( new UtilDateAdaptor() + " | Application Client Start Up" );

        Window.addCloseHandler( this );
        Window.addWindowClosingHandler( this );

        OurUncaughtExceptionHandler handler = new OurUncaughtExceptionHandler( this );
        GWT.setUncaughtExceptionHandler( handler );

        RootPanel zBodyPanel = RootPanel.get();
        zBodyPanel.addStyleName( "litesoft-LayoutOverflowHidden" );
        zBodyPanel.addStyleName( GWT.isScript() ? "litesoft-RegularMode" : "litesoft-HostedMode" );
        /**
         * Add a class to the body element to enable platform-specific CSS rules.
         */
        UserAgent zUserAgent = UserAgent.getInstance();

        zBodyPanel.addStyleName( "UserAgent-" + zUserAgent.getFamily() );
        zBodyPanel.addStyleName( zUserAgent.isLegacyIE() ? "UserAgent-LegacyIE" : "UserAgent-Modern" );

        String zReally = zUserAgent.getReally();
        if ( Strings.isNotNullOrEmpty( zReally ) )
        {
            zBodyPanel.addStyleName( "Really" + zReally );
        }

        getAppPanel().addStyleName( "Platform-" + zUserAgent.getPlatform() );

        onAppLoad();
    }

    private RootPanel getAppPanel()
    {
        return RootPanel.get( APP_PANEL );
    }

    @Override
    public void onAppLoad()
    {
        nativeCodeInjection();
        prefetchImages();
    }

    @Override
    public void onWindowClosing( Window.ClosingEvent pEvent )
    {
    }

    @Override
    public void onClose( CloseEvent<Window> pEvent )
    {
        sWindowClosing = true;
        nativeCodeDispose();
        CLIENT_LOGGER.trace.log( "WindowClosing..." );
    }

    @Override
    public void prefetchImages()
    {
        AlertManager.prefetchImages();
    }

    @Override
    public void nativeCodeInjection()
    {
    }

    @Override
    public void nativeCodeDispose()
    {
    }

    protected SingleWidgetContainer replaceAppPanel()
    {
        return replaceAppPanel( new WindowSizingPanel() );
    }

    protected SingleWidgetContainer replaceAppPanel( SingleWidgetContainer pSWC )
    {
        Element zElement = RootPanel.get().getElement();
        CommonElementHelper.setOverflowHidden( zElement );
        CommonElementHelper.forceNoMarginOrPadding( zElement );

        //noinspection GwtToHtmlReferences
        RootPanel panel = getAppPanel();
        if ( panel == null )
        {
            UtilsGwt.closeWindowNoConfirm( "HTML Corrupted - Failed to find an element with an id of 'AppPanel' in the HTML host page\nWill attempt to close Window!" );
            return null;
        }
        panel.clear(); // properly remove GWT widgets
        zElement = panel.getElement();
        DOM.setInnerText( zElement, "" ); // remove static content
        DOM.setStyleAttribute( zElement, "height", null );
        CommonElementHelper.setOverflowHidden( zElement );
        panel.add( (Widget) pSWC );

        FontSizer.get( DATA_TABLE_TEXT );
        FontSizer.get( HEADER_TABLE_TEXT );

        return pSWC;
    }

    protected void handleUncaughtException( Throwable e )
    {
        if ( e != null )
        {
            ENTRY_POINT_LOGGER.error.log( e );
            AlertManager.alert( "MainApp", "Unexpected Exception", e.getClass().getName(), e );
        }
    }

    private static class OurUncaughtExceptionHandler implements GWT.UncaughtExceptionHandler
    {
        private AbstractClientMainAppEntryPoint mEntryPoint;

        public OurUncaughtExceptionHandler( AbstractClientMainAppEntryPoint pEntryPoint )
        {
            mEntryPoint = pEntryPoint;
        }

        @Override
        public void onUncaughtException( Throwable e )
        {
            if ( !sWindowClosing )
            {
                mEntryPoint.handleUncaughtException( e );
            }
        }
    }
}