import com.github.jknack.handlebars.Context;
import com.github.jknack.handlebars.Handlebars;
import com.github.jknack.handlebars.Template;
import com.github.jknack.handlebars.context.MapValueResolver;
import junit.framework.Assert;
import org.apache.commons.lang3.StringEscapeUtils;
import org.junit.Test;

import java.io.IOException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Collections;
import java.util.Date;

public class MomentJsDateFormatHelperTest
{
   @Test
   public void testMomentJsDateFormatting ()
      throws IOException, ParseException
   {
      SimpleDateFormat sdf = new SimpleDateFormat( "yyyy-MM-dd hh:mm:ss a" );
      Date date = sdf.parse( "2014-10-01 12:32:23 PM" );
      Template template = compileTemplate( "date is {{dateFormat date format='MMMM Do, YYYY [at] hh:mm a [and] ss [seconds]'}}" );
      Context context = createContext( Collections.singletonMap( "date", date ) );
      Assert.assertEquals( "date is October 1st, 2014 at 12:32 pm and 23 seconds", template.apply( context ) );
   }

   @Test
   // RAJ - internally we evaluate the javascript inline using single quotes to surround the format
   public void testFormatIncludingQuotes1 ()
      throws IOException, ParseException
   {
      SimpleDateFormat sdf = new SimpleDateFormat( "yyyy-MM-dd hh:mm:ss a" );
      Date date = sdf.parse( "2014-10-01 12:32:23 PM" );
      Template template = compileTemplate( "date is {{dateFormat date format='MMMM Do, [\\']YY [\"yay\"]'}}" );
      Context context = createContext( Collections.singletonMap( "date", date ) );
      // RAJ - By default, Handlebars escapes text for HTML and we have quotes in our generated output
      String htmlEscapedText = template.apply( context );
      String unescapedText = StringEscapeUtils.unescapeHtml4( htmlEscapedText );
      Assert.assertEquals( "date is October 1st, '14 \"yay\"", unescapedText );
   }

   @Test
   // RAJ - internally we evaluate the javascript inline using single quotes to surround the format
   public void testFormatIncludingQuotes2 ()
      throws IOException, ParseException
   {
      SimpleDateFormat sdf = new SimpleDateFormat( "yyyy-MM-dd hh:mm:ss a" );
      Date date = sdf.parse( "2014-10-01 12:32:23 PM" );
      Template template = compileTemplate( "date is {{dateFormat date format=\"MMMM Do, [']YY [\\\"yay\\\"]\"}}" );
      Context context = createContext( Collections.singletonMap( "date", date ) );
      // RAJ - By default, Handlebars escapes text for HTML and we have quotes in our generated output
      String htmlEscapedText = template.apply( context );
      String unescapedText = StringEscapeUtils.unescapeHtml4( htmlEscapedText );
      Assert.assertEquals( "date is October 1st, '14 \"yay\"", unescapedText );
   }

   @Test
   public void testFormatAndEmptyFormatString ()
      throws IOException, ParseException
   {
      SimpleDateFormat sdf = new SimpleDateFormat( "yyyy-MM-dd hh:mm:ss a" );
      Date date = sdf.parse( "2014-10-01 12:32:23 PM" );
      Template template = compileTemplate( "date is {{dateFormat date}}" );
      Context context = createContext( Collections.singletonMap( "date", date ) );
      // RAJ - I have no idea how this should behave under non-US locales, so I'm not sure how useful this assertion is
      // RAJ - We should probably just check to make sure that something was generated here, rather than the specific format
      // RAJ - Then again, all of the MMMM stuff above is also locale (language) specific...
      Assert.assertEquals( "date is 10/01/2014", template.apply( context ) );
   }

   private Context createContext ( Object data )
   {
      return Context.newBuilder( data )
         .resolver( MapValueResolver.INSTANCE )
         .build();
   }

   private Template compileTemplate ( String templateText )
      throws IOException
   {
      Handlebars handlebars = new Handlebars();
      handlebars.registerHelper( "dateFormat", new MomentJsDateFormatHelper() );
      return handlebars.compileInline( templateText );
   }
}