/* ====================================================================
   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You 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.apache.poi.hwpf;

import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.util.List;

import org.apache.poi.hwpf.model.PicturesTable;
import org.apache.poi.hwpf.usermodel.Picture;

import junit.framework.TestCase;

/**
 * Test picture support in HWPF
 * @author nick
 */
public class TestHWPFPictures extends TestCase {
	private String docAFile;
	private String docBFile;
	private String docCFile;
	
	private String imgAFile;
	private String imgBFile;
	private String imgCFile;
	
	protected void setUp() throws Exception {
		String dirname = System.getProperty("HWPF.testdata.path");
		
		docAFile = dirname + "/testPictures.doc";
		docBFile = dirname + "/two_images.doc";
		docCFile = dirname + "/vector_image.doc";
		
		imgAFile = dirname + "/simple_image.jpg";
		imgBFile = dirname + "/simple_image.png";
		imgCFile = dirname + "/vector_image.emf";
	}
	
	/**
	 * Test just opening the files
	 */
	public void testOpen() throws Exception {
		HWPFDocument docA = new HWPFDocument(new FileInputStream(docAFile));
		HWPFDocument docB = new HWPFDocument(new FileInputStream(docBFile));
	}
	
	/**
	 * Test that we have the right numbers of images in each file
	 */
	public void testImageCount() throws Exception {
		HWPFDocument docA = new HWPFDocument(new FileInputStream(docAFile));
		HWPFDocument docB = new HWPFDocument(new FileInputStream(docBFile));
		
		assertNotNull(docA.getPicturesTable());
		assertNotNull(docB.getPicturesTable());
		
		PicturesTable picA = docA.getPicturesTable();
		PicturesTable picB = docB.getPicturesTable();
		
		List picturesA = picA.getAllPictures();
		List picturesB = picB.getAllPictures();
		
		assertEquals(7, picturesA.size());
		assertEquals(2, picturesB.size());
	}
	
	/**
	 * Test that we have the right images in at least one file
	 */
	public void testImageData() throws Exception {
		HWPFDocument docB = new HWPFDocument(new FileInputStream(docBFile));
		PicturesTable picB = docB.getPicturesTable();
		List picturesB = picB.getAllPictures();
		
		assertEquals(2, picturesB.size());
		
		Picture pic1 = (Picture)picturesB.get(0);
		Picture pic2 = (Picture)picturesB.get(1);
		
		assertNotNull(pic1);
		assertNotNull(pic2);
		
		// Check the same
		byte[] pic1B = readFile(imgAFile);
		byte[] pic2B = readFile(imgBFile);
		
		assertEquals(pic1B.length, pic1.getContent().length);
		assertEquals(pic2B.length, pic2.getContent().length);

		assertBytesSame(pic1B, pic1.getContent());
		assertBytesSame(pic2B, pic2.getContent());
	}
	
	/**
	 * Test that compressed image data is correctly returned.
	 */
	public void testCompressedImageData() throws Exception {
		HWPFDocument docC = new HWPFDocument(new FileInputStream(docCFile));
		PicturesTable picC = docC.getPicturesTable();
		List picturesC = picC.getAllPictures();
		
		assertEquals(1, picturesC.size());
		
		Picture pic = (Picture)picturesC.get(0);
		assertNotNull(pic);
		
		// Check the same
		byte[] picBytes = readFile(imgCFile);
		
		assertEquals(picBytes.length, pic.getContent().length);
		assertBytesSame(picBytes, pic.getContent());
	}
	
	
	private void assertBytesSame(byte[] a, byte[] b) {
		assertEquals(a.length, b.length);
		for(int i=0; i<a.length; i++) {
			assertEquals(a[i],b[i]);
		}
	}
	
	private byte[] readFile(String file) throws Exception {
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		FileInputStream fis = new FileInputStream(file);
		byte[] buffer = new byte[1024];
		
		int read = 0;
		while(read > -1) {
			read = fis.read(buffer);
			if(read > 0) {
				baos.write(buffer,0,read);
			}
		}
		
		return baos.toByteArray();
	}
}