/*
 * Copyright 2000-2013 Enonic AS
 * http://www.enonic.com/license
 */
package com.enonic.cms.core.portal.rendering;

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

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.lang.StringEscapeUtils;

import com.enonic.cms.framework.util.HtmlEncoder;

import com.enonic.cms.core.portal.PortletXsltViewTransformationException;
import com.enonic.cms.core.portal.rendering.tracing.RenderTrace;

final class PortletErrorMessageMarkupCreator
{
    public String createMarkup( String message, Exception exception )
    {
        return createMarkup( message, exception, RenderTrace.isExecutingInDebugMode() );
    }

    private String createMarkup( String message, Exception exception, final boolean showDetails )
    {
        final String details = getDetailsBase64( exception );

        final StringBuilder str = new StringBuilder();
        str.append( "<div class=\"-cms-portlet-error\"" );
        str.append( " style=\"" );
        str.append( " border-style: solid;" );
        str.append( " border-width: 2px;" );
        str.append( " border-color: #FF0000;" );
        str.append( " background-color: #FFC0C0;" );
        str.append( " color: black;" );
        str.append( " font-size: 12px;" );
        str.append( " padding: 4px; " );
        str.append( " text-align: left\">" );
        str.append( HtmlEncoder.encode( message ) );

        if ( showDetails )
        {
            str.append( " (<a href=\"data:text/plain;base64," );
            str.append( details );
            str.append( "\" target=\"__portlet_error\">details</a>)" );
        }

        str.append( "</div>" );
        return str.toString();
    }

    private String getDetails( final Exception e )
    {
        Throwable error = e;
        final StringWriter writer = new StringWriter();

        if ( error instanceof PortletXsltViewTransformationException )
        {
            error = error.getCause();
        }

        error.printStackTrace( new PrintWriter( writer ) );
        return StringEscapeUtils.escapeHtml( writer.toString() );
    }

    private String getDetailsBase64( final Exception e )
    {
        return new String( Base64.encodeBase64( getDetails( e ).getBytes() ) );
    }
}