/*
 * Copyright (C) 2022, Thomas Wolf <thomas.wolf@paranor.ch> 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 org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotEquals;
import static org.junit.Assert.assertThrows;
import static org.junit.Assert.assertTrue;

import org.eclipse.jgit.errors.ConfigInvalidException;
import org.eclipse.jgit.lib.CommitConfig.CleanupMode;
import org.junit.Test;

public class CommitConfigTest {

	@Test
	public void testDefaults() throws Exception {
		CommitConfig cfg = parse("");
		assertEquals("Unexpected clean-up mode", CleanupMode.DEFAULT,
				cfg.getCleanupMode());
	}

	@Test
	public void testCommitCleanup() throws Exception {
		String[] values = { "strip", "whitespace", "verbatim", "scissors",
				"default" };
		CleanupMode[] expected = { CleanupMode.STRIP, CleanupMode.WHITESPACE,
				CleanupMode.VERBATIM, CleanupMode.SCISSORS,
				CleanupMode.DEFAULT };
		for (int i = 0; i < values.length; i++) {
			CommitConfig cfg = parse("[commit]\n\tcleanup = " + values[i]);
			assertEquals("Unexpected clean-up mode", expected[i],
					cfg.getCleanupMode());
		}
	}

	@Test
	public void testResolve() throws Exception {
		String[] values = { "strip", "whitespace", "verbatim", "scissors",
				"default" };
		CleanupMode[] expected = { CleanupMode.STRIP, CleanupMode.WHITESPACE,
				CleanupMode.VERBATIM, CleanupMode.SCISSORS,
				CleanupMode.DEFAULT };
		for (int i = 0; i < values.length; i++) {
			CommitConfig cfg = parse("[commit]\n\tcleanup = " + values[i]);
			for (CleanupMode mode : CleanupMode.values()) {
				for (int j = 0; j < 2; j++) {
					CleanupMode resolved = cfg.resolve(mode, j == 0);
					if (mode != CleanupMode.DEFAULT) {
						assertEquals("Clean-up mode should be unchanged", mode,
								resolved);
					} else if (i + 1 < values.length) {
						assertEquals("Unexpected clean-up mode", expected[i],
								resolved);
					} else {
						assertEquals("Unexpected clean-up mode",
								j == 0 ? CleanupMode.STRIP
										: CleanupMode.WHITESPACE,
								resolved);
					}
				}
			}
		}
	}

	@Test
	public void testCleanDefaultThrows() throws Exception {
		assertThrows(IllegalArgumentException.class, () -> CommitConfig
				.cleanText("Whatever", CleanupMode.DEFAULT, '#'));
	}

	@Test
	public void testCleanVerbatim() throws Exception {
		String message = "\n  \nWhatever  \n\n\n# A comment\n\nMore\t \n\n\n";
		assertEquals("Unexpected message change", message,
				CommitConfig.cleanText(message, CleanupMode.VERBATIM, '#'));
	}

	@Test
	public void testCleanWhitespace() throws Exception {
		String message = "\n  \nWhatever  \n\n\n# A comment\n\nMore\t \n\n\n";
		assertEquals("Unexpected message change",
				"Whatever\n\n# A comment\n\nMore\n",
				CommitConfig.cleanText(message, CleanupMode.WHITESPACE, '#'));
	}

	@Test
	public void testCleanStrip() throws Exception {
		String message = "\n  \nWhatever  \n\n\n# A comment\n\nMore\t \n\n\n";
		assertEquals("Unexpected message change", "Whatever\n\nMore\n",
				CommitConfig.cleanText(message, CleanupMode.STRIP, '#'));
	}

	@Test
	public void testCleanStripCustomChar() throws Exception {
		String message = "\n  \nWhatever  \n\n\n# Not a comment\n\n   <A comment\nMore\t \n\n\n";
		assertEquals("Unexpected message change",
				"Whatever\n\n# Not a comment\n\nMore\n",
				CommitConfig.cleanText(message, CleanupMode.STRIP, '<'));
	}

	@Test
	public void testCleanScissors() throws Exception {
		String message = "\n  \nWhatever  \n\n\n# Not a comment\n\n   <A comment\nMore\t \n\n\n"
				+ "# ------------------------ >8 ------------------------\n"
				+ "More\nMore\n";
		assertEquals("Unexpected message change",
				"Whatever\n\n# Not a comment\n\n   <A comment\nMore\n",
				CommitConfig.cleanText(message, CleanupMode.SCISSORS, '#'));
	}

	@Test
	public void testCleanScissorsCustomChar() throws Exception {
		String message = "\n  \nWhatever  \n\n\n# Not a comment\n\n   <A comment\nMore\t \n\n\n"
				+ "< ------------------------ >8 ------------------------\n"
				+ "More\nMore\n";
		assertEquals("Unexpected message change",
				"Whatever\n\n# Not a comment\n\n   <A comment\nMore\n",
				CommitConfig.cleanText(message, CleanupMode.SCISSORS, '<'));
	}

	@Test
	public void testCleanScissorsAtTop() throws Exception {
		String message = "# ------------------------ >8 ------------------------\n"
				+ "\n  \nWhatever  \n\n\n# Not a comment\n\n   <A comment\nMore\t \n\n\n"
				+ "More\nMore\n";
		assertEquals("Unexpected message change", "",
				CommitConfig.cleanText(message, CleanupMode.SCISSORS, '#'));
	}

	@Test
	public void testCleanScissorsNoScissor() throws Exception {
		String message = "\n  \nWhatever  \n\n\n# A comment\n\nMore\t \n\n\n";
		assertEquals("Unexpected message change",
				"Whatever\n\n# A comment\n\nMore\n",
				CommitConfig.cleanText(message, CleanupMode.SCISSORS, '#'));
	}

	@Test
	public void testCleanScissorsNoScissor2() throws Exception {
		String message = "Text\n"
				+ "## ------------------------ >8 ------------------------\n"
				+ "More\nMore\n";
		assertEquals("Unexpected message change", message,
				CommitConfig.cleanText(message, CleanupMode.SCISSORS, '#'));
	}

	@Test
	public void testCleanScissorsNoScissor3() throws Exception {
		String message = "Text\n"
				// Wrong number of dashes
				+ "# ----------------------- >8 ------------------------\n"
				+ "More\nMore\n";
		assertEquals("Unexpected message change", message,
				CommitConfig.cleanText(message, CleanupMode.SCISSORS, '#'));
	}

	@Test
	public void testCleanScissorsAtEnd() throws Exception {
		String message = "Text\n"
				+ "# ------------------------ >8 ------------------------\n";
		assertEquals("Unexpected message change", "Text\n",
				CommitConfig.cleanText(message, CleanupMode.SCISSORS, '#'));
	}

	@Test
	public void testCommentCharDefault() throws Exception {
		CommitConfig cfg = parse("");
		assertEquals('#', cfg.getCommentChar());
		assertFalse(cfg.isAutoCommentChar());
	}

	@Test
	public void testCommentCharAuto() throws Exception {
		CommitConfig cfg = parse("[core]\n\tcommentChar = auto\n");
		assertEquals('#', cfg.getCommentChar());
		assertTrue(cfg.isAutoCommentChar());
	}

	@Test
	public void testCommentCharEmpty() throws Exception {
		CommitConfig cfg = parse("[core]\n\tcommentChar =\n");
		assertEquals('#', cfg.getCommentChar());
	}

	@Test
	public void testCommentCharInvalid() throws Exception {
		CommitConfig cfg = parse("[core]\n\tcommentChar = \" \"\n");
		assertEquals('#', cfg.getCommentChar());
	}

	@Test
	public void testCommentCharNonAscii() throws Exception {
		CommitConfig cfg = parse("[core]\n\tcommentChar = ö\n");
		assertEquals('#', cfg.getCommentChar());
	}

	@Test
	public void testCommentChar() throws Exception {
		CommitConfig cfg = parse("[core]\n\tcommentChar = _\n");
		assertEquals('_', cfg.getCommentChar());
	}

	@Test
	public void testDetermineCommentChar() throws Exception {
		String text = "A commit message\n\nBody\n";
		assertEquals('#', CommitConfig.determineCommentChar(text));
	}

	@Test
	public void testDetermineCommentChar2() throws Exception {
		String text = "A commit message\n\nBody\n\n# Conflicts:\n#\tfoo.txt\n";
		char ch = CommitConfig.determineCommentChar(text);
		assertNotEquals('#', ch);
		assertTrue(ch > ' ' && ch < 127);
	}

	@Test
	public void testDetermineCommentChar3() throws Exception {
		String text = "A commit message\n\n;Body\n\n# Conflicts:\n#\tfoo.txt\n";
		char ch = CommitConfig.determineCommentChar(text);
		assertNotEquals('#', ch);
		assertNotEquals(';', ch);
		assertTrue(ch > ' ' && ch < 127);
	}

	@Test
	public void testDetermineCommentChar4() throws Exception {
		String text = "A commit message\n\nBody\n\n  # Conflicts:\n\t #\tfoo.txt\n";
		char ch = CommitConfig.determineCommentChar(text);
		assertNotEquals('#', ch);
		assertTrue(ch > ' ' && ch < 127);
	}

	@Test
	public void testDetermineCommentChar5() throws Exception {
		String text = "A commit message\n\nBody\n\n#a\n;b\n@c\n!d\n$\n%\n^\n&\n|\n:";
		char ch = CommitConfig.determineCommentChar(text);
		assertEquals(0, ch);
	}

	private static CommitConfig parse(String content)
			throws ConfigInvalidException {
		Config c = new Config();
		c.fromText(content);
		return c.get(CommitConfig.KEY);
	}

}