/*******************************************************************************
 * Copyright 2013 SAP AG
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package com.sap.core.odata.core.debug;

import static org.junit.Assert.assertEquals;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;

import org.apache.commons.codec.binary.Base64;
import org.junit.Test;

import com.sap.core.odata.api.commons.HttpContentType;
import com.sap.core.odata.api.processor.ODataResponse;
import com.sap.core.odata.core.ep.util.JsonStreamWriter;

/**
 * @author SAP AG
 */
public class DebugInfoBodyTest {

  private static final String STRING_CONTENT = "StringContent";
  private static final String STRING_CONTENT_JSON = "\"" + STRING_CONTENT + "\"";

  @Test
  public void jsonStringContent() throws Exception {
    ODataResponse response = mock(ODataResponse.class);
    when(response.getEntity()).thenReturn(STRING_CONTENT);
    when(response.getContentHeader()).thenReturn(HttpContentType.APPLICATION_OCTET_STREAM);
    assertEquals(STRING_CONTENT_JSON, appendJson(response));

    when(response.getContentHeader()).thenReturn("image/png");
    assertEquals(STRING_CONTENT_JSON, appendJson(response));
  }

  @Test
  public void jsonInputStreamContent() throws Exception {
    ODataResponse response = mock(ODataResponse.class);
    ByteArrayInputStream in = new ByteArrayInputStream(STRING_CONTENT.getBytes());
    when(response.getEntity()).thenReturn(in);
    when(response.getContentHeader()).thenReturn(HttpContentType.APPLICATION_OCTET_STREAM);
    assertEquals(STRING_CONTENT_JSON, appendJson(response));

    in = new ByteArrayInputStream(STRING_CONTENT.getBytes());
    when(response.getEntity()).thenReturn(in);
    when(response.getContentHeader()).thenReturn("image/png");
    assertEquals("\"" + Base64.encodeBase64String(STRING_CONTENT.getBytes()) + "\"",
        appendJson(response));
  }

  @Test(expected = ClassCastException.class)
  public void jsonUnsupportedContent() throws Exception {
    ODataResponse response = mock(ODataResponse.class);
    when(response.getEntity()).thenReturn(new Object());
    when(response.getContentHeader()).thenReturn(HttpContentType.APPLICATION_OCTET_STREAM);

    appendJson(response);
  }

  private String appendJson(final ODataResponse response) throws IOException {
    Writer writer = new StringWriter();
    DebugInfoBody body = new DebugInfoBody(response);
    body.appendJson(new JsonStreamWriter(writer));
    return writer.toString();
  }
}