/*
 * Copyright Red Hat, Inc. and/or its affiliates
 * and other contributors as indicated by the @author tags and
 * the COPYRIGHT.txt file distributed with this work.
 *
 * 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 org.teiid.common.buffer;

import static org.junit.Assert.*;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringReader;
import java.nio.charset.Charset;
import java.util.Arrays;
import java.util.List;

import org.junit.Test;
import org.teiid.common.buffer.FileStore.FileStoreOutputStream;
import org.teiid.common.buffer.LobManager.ReferenceMode;
import org.teiid.core.types.BlobImpl;
import org.teiid.core.types.BlobType;
import org.teiid.core.types.ClobImpl;
import org.teiid.core.types.ClobType;
import org.teiid.core.types.DataTypeManager;
import org.teiid.core.types.InputStreamFactory;
import org.teiid.core.types.InputStreamFactory.StorageMode;
import org.teiid.core.types.Streamable;
import org.teiid.core.util.ObjectConverterUtil;
import org.teiid.core.util.ReaderInputStream;

@SuppressWarnings("nls")
public class TestLobManager {

	@Test
	public void testLobPeristence() throws Exception{
		
		BufferManager buffMgr = BufferManagerFactory.getStandaloneBufferManager();
		FileStore fs = buffMgr.createFileStore("temp");
		
		ClobType clob = new ClobType(new ClobImpl(new InputStreamFactory() {
			@Override
			public InputStream getInputStream() throws IOException {
				return new ReaderInputStream(new StringReader("Clob contents One"),  Charset.forName(Streamable.ENCODING)); 
			}
			
		}, -1));
		
		BlobType blob = new BlobType(new BlobImpl(new InputStreamFactory() {
			@Override
			public InputStream getInputStream() throws IOException {
				return new ReaderInputStream(new StringReader("Blob contents Two"),  Charset.forName(Streamable.ENCODING));
			}
			
		}));
		
		BlobType blobEmpty = new BlobType(new BlobImpl(new InputStreamFactory() {
			@Override
			public InputStream getInputStream() throws IOException {
				return new ByteArrayInputStream(new byte[0]);
			}
			
		}));
		
		FileStore fs1 = buffMgr.createFileStore("blob");
		FileStoreInputStreamFactory fsisf = new FileStoreInputStreamFactory(fs1, Streamable.ENCODING);
		FileStoreOutputStream fsos = fsisf.getOuputStream();
		byte[] b = new byte[DataTypeManager.MAX_LOB_MEMORY_BYTES + 1];
		fsos.write(b);
		fsos.close();
		BlobType blob1 = new BlobType(new BlobImpl(fsisf));		
		
		assertNotNull(blob1.getReferenceStreamId());
		
		LobManager lobManager = new LobManager(new int[] {0, 1, 2, 3}, fs);
		lobManager.setMaxMemoryBytes(4);
		List<?> tuple = Arrays.asList(clob, blob, blob1, blobEmpty);
		lobManager.updateReferences(tuple, ReferenceMode.CREATE);
		
		assertNotNull(blob1.getReferenceStreamId());
		
		lobManager.persist();
		
		Streamable<?>lob = lobManager.getLobReference(clob.getReferenceStreamId());
		assertTrue(lob.getClass().isAssignableFrom(ClobType.class));
		ClobType clobRead = (ClobType)lob;
		assertEquals(ClobType.getString(clob), ClobType.getString(clobRead));
		assertTrue(clobRead.length() != -1);
		
		lob = lobManager.getLobReference(blob.getReferenceStreamId());
		assertTrue(lob.getClass().isAssignableFrom(BlobType.class));
		BlobType blobRead = (BlobType)lob;
		assertTrue(Arrays.equals(ObjectConverterUtil.convertToByteArray(blob.getBinaryStream()), ObjectConverterUtil.convertToByteArray(blobRead.getBinaryStream())));
		
		lobManager.updateReferences(tuple, ReferenceMode.REMOVE);
		
		assertEquals(0, lobManager.getLobCount());
		
	}
	
	@Test public void testInlining() throws Exception{
		
		BufferManager buffMgr = BufferManagerFactory.getStandaloneBufferManager();
		FileStore fs = buffMgr.createFileStore("temp");
		
		ClobType clob = new ClobType(new ClobImpl(new InputStreamFactory() {
			@Override
			public InputStream getInputStream() throws IOException {
				return new ReaderInputStream(new StringReader("small"),  Charset.forName(Streamable.ENCODING)); 
			}
			
		}, 5));
		
		assertEquals(StorageMode.OTHER, InputStreamFactory.getStorageMode(clob));
		
		LobManager lobManager = new LobManager(new int[] {0}, fs);
		
		lobManager.updateReferences(Arrays.asList(clob), ReferenceMode.CREATE);
		
		assertEquals(StorageMode.MEMORY, InputStreamFactory.getStorageMode(clob));
	}
	
}
