/*
 * Copyright (C) 2018, Salesforce. 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.lib;

import static java.nio.charset.StandardCharsets.US_ASCII;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.assertThrows;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.text.MessageFormat;

import org.eclipse.jgit.internal.JGitText;
import org.junit.Test;

public class CommitBuilderTest {

	// @formatter:off
	private static final String SIGNATURE = "-----BEGIN PGP SIGNATURE-----\n" +
			"Version: BCPG v1.60\n" +
			"\n" +
			"iQEcBAABCAAGBQJb9cVhAAoJEKX+6Axg/6TZeFsH/0CY0WX/z7U8+7S5giFX4wH4\n" +
			"opvBwqyt6OX8lgNwTwBGHFNt8LdmDCCmKoq/XwkNi3ARVjLhe3gBcKXNoavvPk2Z\n" +
			"gIg5ChevGkU4afWCOMLVEYnkCBGw2+86XhrK1P7gTHEk1Rd+Yv1ZRDJBY+fFO7yz\n" +
			"uSBuF5RpEY2sJiIvp27Gub/rY3B5NTR/feO/z+b9oiP/fMUhpRwG5KuWUsn9NPjw\n" +
			"3tvbgawYpU/2UnS+xnavMY4t2fjRYjsoxndPLb2MUX8X7vC7FgWLBlmI/rquLZVM\n" +
			"IQEKkjnA+lhejjK1rv+ulq4kGZJFKGYWYYhRDwFg5PTkzhudhN2SGUq5Wxq1Eg4=\n" +
			"=b9OI\n" +
			"-----END PGP SIGNATURE-----";

	private static final String EXPECTED = "-----BEGIN PGP SIGNATURE-----\n" +
			" Version: BCPG v1.60\n" +
			" \n" +
			" iQEcBAABCAAGBQJb9cVhAAoJEKX+6Axg/6TZeFsH/0CY0WX/z7U8+7S5giFX4wH4\n" +
			" opvBwqyt6OX8lgNwTwBGHFNt8LdmDCCmKoq/XwkNi3ARVjLhe3gBcKXNoavvPk2Z\n" +
			" gIg5ChevGkU4afWCOMLVEYnkCBGw2+86XhrK1P7gTHEk1Rd+Yv1ZRDJBY+fFO7yz\n" +
			" uSBuF5RpEY2sJiIvp27Gub/rY3B5NTR/feO/z+b9oiP/fMUhpRwG5KuWUsn9NPjw\n" +
			" 3tvbgawYpU/2UnS+xnavMY4t2fjRYjsoxndPLb2MUX8X7vC7FgWLBlmI/rquLZVM\n" +
			" IQEKkjnA+lhejjK1rv+ulq4kGZJFKGYWYYhRDwFg5PTkzhudhN2SGUq5Wxq1Eg4=\n" +
			" =b9OI\n" +
			" -----END PGP SIGNATURE-----";
	// @formatter:on

	private void assertGpgSignatureStringOutcome(String signature,
			String expectedOutcome) throws IOException {
		ByteArrayOutputStream out = new ByteArrayOutputStream();
		CommitBuilder.writeGpgSignatureString(signature, out);
		String formatted_signature = new String(out.toByteArray(), US_ASCII);
		assertEquals(expectedOutcome, formatted_signature);
	}

	@Test
	public void writeGpgSignatureString() throws Exception {
		assertGpgSignatureStringOutcome(SIGNATURE, EXPECTED);
	}

	@Test
	public void writeGpgSignatureStringTrailingLF() throws Exception {
		assertGpgSignatureStringOutcome(SIGNATURE + '\n', EXPECTED);
	}

	@Test
	public void writeGpgSignatureStringCRLF() throws Exception {
		assertGpgSignatureStringOutcome(SIGNATURE.replaceAll("\n", "\r\n"),
				EXPECTED);
	}

	@Test
	public void writeGpgSignatureStringTrailingCRLF() throws Exception {
		assertGpgSignatureStringOutcome(
				SIGNATURE.replaceAll("\n", "\r\n") + "\r\n", EXPECTED);
	}

	@Test
	public void writeGpgSignatureString_failsForNonAscii() throws Exception {
		String signature = "Ü Ä";
		IllegalArgumentException e = assertThrows(
				IllegalArgumentException.class,
				() -> CommitBuilder.writeGpgSignatureString(signature,
						new ByteArrayOutputStream()));
		String message = MessageFormat.format(JGitText.get().notASCIIString,
				signature);
		assertEquals(message, e.getMessage());
	}

	@Test
	public void writeGpgSignatureString_oneLineNotModified() throws Exception {
		String signature = "    A string   ";
		String expectedOutcome = signature;
		assertGpgSignatureStringOutcome(signature, expectedOutcome);
	}

	@Test
	public void writeGpgSignatureString_preservesRandomWhitespace()
			throws Exception {
		// @formatter:off
		String signature = "    String with    \n"
				+ "Line 2\n"
				+ " Line 3\n"
				+ "Line 4   \n"
				+ "  Line 5  ";
		String expectedOutcome = "    String with    \n"
				+ " Line 2\n"
				+ "  Line 3\n"
				+ " Line 4   \n"
				+ "   Line 5  ";
		// @formatter:on
		assertGpgSignatureStringOutcome(signature, expectedOutcome);
	}

	@Test
	public void writeGpgSignatureString_replaceCR() throws Exception {
		// @formatter:off
		String signature = "String with \r"
				+ "Line 2\r"
				+ "Line 3\r"
				+ "Line 4\r"
				+ "Line 5";
		String expectedOutcome = "String with \n"
				+ " Line 2\n"
				+ " Line 3\n"
				+ " Line 4\n"
				+ " Line 5";
		// @formatter:on
		assertGpgSignatureStringOutcome(signature, expectedOutcome);
	}

	@Test
	public void writeGpgSignatureString_replaceCRLF() throws Exception {
		// @formatter:off
		String signature = "String with \r\n"
				+ "Line 2\r\n"
				+ "Line 3\r\n"
				+ "Line 4\r\n"
				+ "Line 5";
		String expectedOutcome = "String with \n"
				+ " Line 2\n"
				+ " Line 3\n"
				+ " Line 4\n"
				+ " Line 5";
		// @formatter:on
		assertGpgSignatureStringOutcome(signature, expectedOutcome);
	}

	@Test
	public void writeGpgSignatureString_replaceCRLFMixed() throws Exception {
		// @formatter:off
		String signature = "String with \r"
				+ "Line 2\r\n"
				+ "Line 3\r"
				+ "Line 4\r\n"
				+ "Line 5";
		String expectedOutcome = "String with \n"
				+ " Line 2\n"
				+ " Line 3\n"
				+ " Line 4\n"
				+ " Line 5";
		// @formatter:on
		assertGpgSignatureStringOutcome(signature, expectedOutcome);
	}

	@Test
	public void setGpgSignature() throws Exception {
		GpgSignature dummy = new GpgSignature(new byte[0]);

		CommitBuilder builder = new CommitBuilder();
		assertNull(builder.getGpgSignature());

		builder.setGpgSignature(dummy);
		assertSame(dummy, builder.getGpgSignature());

		builder.setGpgSignature(null);
		assertNull(builder.getGpgSignature());
	}
}