package org.litesoft.sandbox.csapp.client.widgets;

import com.google.gwt.event.dom.client.*;
import com.google.gwt.safehtml.shared.*;
import com.google.gwt.user.client.*;
import com.google.gwt.user.client.ui.*;

public class CertUploadWidget extends Composite implements IsWidget,
                                                           UploadWidget.Callback {
    private static final String UP_IMAGE_URL = "common/uploadCert.png";
    private static final String UP_DISABLED_IMAGE_URL = "common/uploadCertDisabled.png";

    private static final String REMOVE_REGULAR_IMAGE_URL = "common/Remove.gif";
    private static final String REMOVE_DISABLED_IMAGE_URL = "common/RemoveDisabled.gif";
    private static final String REMOVE_HOVER_IMAGE_URL = "common/RemoveHover.gif";
    private static final String REMOVE_PRESSED_IMAGE_URL = "common/RemovePressed.gif";

    private static final String BUSY_IMAGE_URL = "common/BigBusy.gif";

    private static final int SECONDS_TO_WAIT = 30;

    private static final String WAIT_MESSAGE = "Checking Certificate Validity,\nthis can take a while...\n${seconds}\nseconds until timeout.";

    private final UploadWidget uploader;
    private final HTML resultsDisplay = new HTML( " " );
    private final ScrollPanel resultsContainer = new ScrollPanel();

    public CertUploadWidget() {
        PushButton illusionaryButton = new PushButton( new Image( UP_IMAGE_URL ) );
        illusionaryButton.getUpDisabledFace().setImage( new Image( UP_DISABLED_IMAGE_URL ) );

        PushButton removeButton = new PushButton( new Image( REMOVE_REGULAR_IMAGE_URL ) );
        removeButton.getUpDisabledFace().setImage( new Image( REMOVE_DISABLED_IMAGE_URL ) );
        removeButton.getUpHoveringFace().setImage( new Image( REMOVE_HOVER_IMAGE_URL ) );
        removeButton.getDownFace().setImage( new Image( REMOVE_PRESSED_IMAGE_URL ) );
        removeButton.getDownHoveringFace().setImage( new Image( REMOVE_PRESSED_IMAGE_URL ) );
        removeButton.addClickHandler( new ClickHandler() {
            @Override
            public void onClick( ClickEvent event ) {
                resultsDisplay.setHTML( " " );
                // todo: Clear the actual Base64 file contents
            }
        } );

        uploader = new UploadWidget( illusionaryButton, removeButton, SECONDS_TO_WAIT, this );
        resultsContainer.setWidget( resultsDisplay );
        resultsContainer.addStyleName( "CertUploadResults" );
        VerticalPanel panel = new VerticalPanel();
        panel.addStyleName( "CertUpload" );
        panel.add( uploader );
        panel.add( createSpacer( "CertUploadResultsRemoveSpacer" ) );
        panel.add( createResultsRemoveWidget( resultsContainer, removeButton ) );
        initWidget( panel );
    }

    public void setServletPath( String url ) {
        uploader.setServletPath( url );
    }

    public void setEnabled( boolean enable ) {
        uploader.setEnabled( enable );
    }

    public void setResultsWidth( String width ) {
        resultsContainer.setWidth( width );
    }

    public void setResultsHeight( String height ) {
        resultsContainer.setHeight( height );
    }

    protected void showBusy() {
        uploader.showBusy();
    }

    private Widget createResultsRemoveWidget( ScrollPanel resultsContainer, ButtonBase removeButton ) {
        HorizontalPanel panel = new HorizontalPanel();
        panel.addStyleName( "CertUploadResultsRemove" );
        panel.add( resultsContainer );
        panel.add( createSpacer( "CertUploadResultsRemoveSpacer" ) );
        panel.add( removeButton );
        return panel;
    }

    private Widget createSpacer( String className ) {
        HTML div = new HTML( " " );
        div.addStyleName( className );
        return div;
    }

    @Override
    public Image createBusyImage() {
        return new Image( BUSY_IMAGE_URL );
    }

    @Override
    public Widget createWaitingMessageWidget( Widget secondsRemaining ) {
        VerticalPanel panel = new VerticalPanel();
        panel.setHorizontalAlignment( HasHorizontalAlignment.ALIGN_CENTER );
        String message = WAIT_MESSAGE;
        int from = 0;
        for ( int at; -1 != (at = message.indexOf( '\n', from )); from = at + 1 ) {
            panel.add( createLabel( message.substring( from, at ), secondsRemaining ) );
        }
        panel.add( createLabel( message.substring( from ), secondsRemaining ) );
        return panel;
    }

    private Widget createLabel( String line, Widget secondsRemainingWidget ) {
        return line.equals( "${seconds}" ) ? secondsRemainingWidget : new Label( line );
    }

    @Override
    public void requestingUpload( String filename ) {
        resultsDisplay.setHTML( "Uploading '" + filename + "' ..." );
    }

    @Override
    public void timeout( String filename ) {
        if ( (filename == null) || (filename.length() == 0) ) {
            filename = "N/A";
        }
        Window.alert( "The Cert processing for\n" + filename + "\nhas Timed Out.\n\nIt may yet arrive..." );
    }

    @Override
    public void parseResponse( String fileName, String htmlResponse ) {
        // Truly Bad Url:
        // null

        // No Servlet:
        // <h2>HTTP ERROR: 404</h2><pre>NOT_FOUND</pre>
        // <p>RequestURI=/v2/TestSubmit</p><p><i><small><a href="http://jetty.mortbay.org/">Powered by Jetty://</a></small></i></p><br>
        // <br>
        // <br>
        // <br>
        // ...

        System.out.println( "parseResponse:\n" + htmlResponse );
        resultsDisplay.setHTML( SafeHtmlUtils.htmlEscapeAllowEntities( "Got Response (" + htmlResponse.length() + " bytes)\nfor\n" + fileName ) );
    }
}