package com.atlassian.plugins.rest.module.filter;
   
   import static org.junit.Assert.assertEquals;
   import static org.mockito.Mockito.mock;
   
   import java.util.List;
   import java.util.Locale;
   
   import javax.ws.rs.core.HttpHeaders;
  
  import org.junit.Test;
  
  import com.sun.jersey.core.header.InBoundHeaders;
  import com.sun.jersey.spi.container.ContainerRequest;
  import com.sun.jersey.spi.container.WebApplication;
  
  public class AcceptLanguageFilterTest {
      private static final ContainerRequest createRequestWithLanguages(String langs) {
          WebApplication wa = mock(WebApplication.class);
          InBoundHeaders headers = new InBoundHeaders();
          headers.add(HttpHeaders.ACCEPT_LANGUAGE, langs);
          return new ContainerRequest(wa, null, null, null, headers, null);
      }
  
      private static final List<Locale> parse(String langs) {
          AcceptLanguageFilter f = new AcceptLanguageFilter();
          ContainerRequest req = createRequestWithLanguages(langs);
          ContainerRequest r = f.filter(req);
          return r.getAcceptableLanguages();
      }
  
      @Test
      public void testLanguageTag() {
          List<Locale> l = parse("en-US");
          assertEquals("size", 1, l.size());
          assertEquals("content#0", Locale.forLanguageTag("en-US"), l.get(0));
      }
  
      @Test
      public void testUNM49Tag() {
          List<Locale> l = parse("es-419");
          assertEquals("size", 1, l.size());
          assertEquals("content#0", Locale.forLanguageTag("es-419"), l.get(0));
      }
  
      @Test
      public void testAcceptableLanguageTag() {
          List<Locale> l = parse("en-US;q=0.123");
          assertEquals("size", 1, l.size());
          assertEquals("content#0", Locale.forLanguageTag("en-US"), l.get(0));
      }
  
      @Test
      public void testAcceptableLanguageTagList() {
          List<Locale> l = parse("en-US;q=0.123, fr;q=0.2, en;q=0.3, *;q=0.01");
          assertEquals("size", 4, l.size());
          assertEquals("content#0", Locale.forLanguageTag("en"), l.get(0));
          assertEquals("content#1", Locale.forLanguageTag("fr"), l.get(1));
          assertEquals("content#2", Locale.forLanguageTag("en-US"), l.get(2));
          assertEquals("content#3", new Locale("*"), l.get(3));
      }
  
      @Test
      public void testHeadersChange() {
          ContainerRequest r = createRequestWithLanguages("en-US");
          AcceptLanguageFilter f = new AcceptLanguageFilter();
          r = f.filter(r);
  
          // Parse & cache langs
          r.getAcceptableLanguages();
  
          // Change headers value
          InBoundHeaders headers = new InBoundHeaders();
          headers.add(HttpHeaders.ACCEPT_LANGUAGE, "fr");
  
          // Parse again
          r.setHeaders(headers);
          List<Locale> l = r.getAcceptableLanguages();
          assertEquals("size", 1, l.size());
          assertEquals("content#0", Locale.forLanguageTag("fr"), l.get(0));
      }
  }