/*
    * Copyright (C) 2008, Google Inc. and others
    *
    * This program and the accompanying materials are made available under the
    * terms of the Eclipse Distribution License v. 1.0 which is available at
    * https://www.eclipse.org/org/documents/edl-v10.php.
    *
    * SPDX-License-Identifier: BSD-3-Clause
    */
  
  package org.eclipse.jgit.patch;
  
  import static java.nio.charset.StandardCharsets.ISO_8859_1;
  import static java.nio.charset.StandardCharsets.UTF_8;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  import static org.junit.Assert.fail;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.nio.charset.Charset;
  
  import org.eclipse.jgit.junit.JGitTestUtil;
  import org.junit.Test;
  
  public class GetTextTest {
  	@Test
  	public void testGetText_BothISO88591() throws IOException {
  		final Charset cs = ISO_8859_1;
  		final Patch p = parseTestPatchFile();
  		assertTrue(p.getErrors().isEmpty());
  		assertEquals(1, p.getFiles().size());
  		final FileHeader fh = p.getFiles().get(0);
  		assertEquals(2, fh.getHunks().size());
  		assertEquals(readTestPatchFile(cs), fh.getScriptText(cs, cs));
  	}
  
  	@Test
  	public void testGetText_NoBinary() throws IOException {
  		final Charset cs = ISO_8859_1;
  		final Patch p = parseTestPatchFile();
  		assertTrue(p.getErrors().isEmpty());
  		assertEquals(1, p.getFiles().size());
  		final FileHeader fh = p.getFiles().get(0);
  		assertEquals(0, fh.getHunks().size());
  		assertEquals(readTestPatchFile(cs), fh.getScriptText(cs, cs));
  	}
  
  	@Test
  	public void testGetText_Convert() throws IOException {
  		final Charset csOld = ISO_8859_1;
  		final Charset csNew = UTF_8;
  		final Patch p = parseTestPatchFile();
  		assertTrue(p.getErrors().isEmpty());
  		assertEquals(1, p.getFiles().size());
  		final FileHeader fh = p.getFiles().get(0);
  		assertEquals(2, fh.getHunks().size());
  
  		// Read the original file as ISO-8859-1 and fix up the one place
  		// where we changed the character encoding. That makes the exp
  		// string match what we really expect to get back.
  		//
  		String exp = readTestPatchFile(csOld);
  		exp = exp.replace("\303\205ngstr\303\266m", "\u00c5ngstr\u00f6m");
  
  		assertEquals(exp, fh.getScriptText(csOld, csNew));
  	}
  
  	@Test
  	public void testGetText_DiffCc() throws IOException {
  		final Charset csOld = ISO_8859_1;
  		final Charset csNew = UTF_8;
  		final Patch p = parseTestPatchFile();
  		assertTrue(p.getErrors().isEmpty());
  		assertEquals(1, p.getFiles().size());
  		final CombinedFileHeader fh = (CombinedFileHeader) p.getFiles().get(0);
  		assertEquals(1, fh.getHunks().size());
  
  		// Read the original file as ISO-8859-1 and fix up the one place
  		// where we changed the character encoding. That makes the exp
  		// string match what we really expect to get back.
  		//
  		String exp = readTestPatchFile(csOld);
  		exp = exp.replace("\303\205ngstr\303\266m", "\u00c5ngstr\u00f6m");
  
  		assertEquals(exp, fh
  				.getScriptText(new Charset[] { csNew, csOld, csNew }));
  	}
  
  	private Patch parseTestPatchFile() throws IOException {
  		final String patchFile = JGitTestUtil.getName() + ".patch";
  		try (InputStream in = getClass().getResourceAsStream(patchFile)) {
  			if (in == null) {
  				fail("No " + patchFile + " test vector");
  				return null; // Never happens
  			}
  			final Patch p = new Patch();
  			p.parse(in);
 			return p;
 		}
 	}
 
 	private String readTestPatchFile(Charset cs) throws IOException {
 		final String patchFile = JGitTestUtil.getName() + ".patch";
 		try (InputStream in = getClass().getResourceAsStream(patchFile)) {
 			if (in == null) {
 				fail("No " + patchFile + " test vector");
 				return null; // Never happens
 			}
 			final InputStreamReader r = new InputStreamReader(in, cs);
 			char[] tmp = new char[2048];
 			final StringBuilder s = new StringBuilder();
 			int n;
 			while ((n = r.read(tmp)) > 0)
 				s.append(tmp, 0, n);
 			return s.toString();
 		}
 	}
 }