/*
    * Copyright (C) 2019, Vishal Devgire <vishaldevgire@gmail.com> 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.util;
  
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  
  import java.io.File;
  import java.io.IOException;
  import java.nio.file.Files;
  import java.nio.file.Path;
  
  import org.eclipse.jgit.junit.MockSystemReader;
  import org.eclipse.jgit.lib.ConfigConstants;
  import org.eclipse.jgit.storage.file.FileBasedConfig;
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Test;
  
  public class FS_POSIXTest {
  	private FileBasedConfig jgitConfig;
  
  	private FileBasedConfig systemConfig;
  
  	private FileBasedConfig userConfig;
  
  	private Path tmp;
  
  	@Before
  	public void setUp() throws Exception {
  		tmp = Files.createTempDirectory("jgit_test_");
  
  		MockSystemReader mockSystemReader = new MockSystemReader();
  		SystemReader.setInstance(mockSystemReader);
  
  		// Measure timer resolution before the test to avoid time critical tests
  		// are affected by time needed for measurement.
  		// The MockSystemReader must be configured first since we need to use
  		// the same one here
  		FS.getFileStoreAttributes(tmp.getParent());
  
  		jgitConfig = new FileBasedConfig(new File(tmp.toFile(), "jgitconfig"),
  				FS.DETECTED);
  		systemConfig = new FileBasedConfig(jgitConfig,
  				new File(tmp.toFile(), "systemgitconfig"), FS.DETECTED);
  		userConfig = new FileBasedConfig(systemConfig,
  				new File(tmp.toFile(), "usergitconfig"), FS.DETECTED);
  		// We have to set autoDetach to false for tests, because tests expect to
  		// be able to clean up by recursively removing the repository, and
  		// background GC might be in the middle of writing or deleting files,
  		// which would disrupt this.
  		userConfig.setBoolean(ConfigConstants.CONFIG_GC_SECTION, null,
  				ConfigConstants.CONFIG_KEY_AUTODETACH, false);
  		userConfig.save();
  		mockSystemReader.setJGitConfig(jgitConfig);
  		mockSystemReader.setSystemGitConfig(systemConfig);
  		mockSystemReader.setUserGitConfig(userConfig);
  	}
  
  	@After
  	public void tearDown() throws IOException {
  		SystemReader.setInstance(null);
  		FileUtils.delete(tmp.toFile(), FileUtils.RECURSIVE | FileUtils.RETRY);
  	}
  
  	@Test
  	public void supportsAtomicCreateNewFile_shouldReturnSupportedAsDefault() {
  		assertTrue(new FS_POSIX().supportsAtomicCreateNewFile());
  	}
  
  	@Test
  	public void supportsAtomicCreateNewFile_shouldReturnTrueIfFlagIsSetInUserConfig() {
  		setAtomicCreateCreationFlag(userConfig, "true");
  		assertTrue(new FS_POSIX().supportsAtomicCreateNewFile());
  	}
  
  	@Test
  	public void supportsAtomicCreateNewFile_shouldReturnTrueIfFlagIsSetInSystemConfig() {
  		setAtomicCreateCreationFlag(systemConfig, "true");
  		assertTrue(new FS_POSIX().supportsAtomicCreateNewFile());
  	}
  
  	@Test
  	public void supportsAtomicCreateNewFile_shouldReturnFalseIfFlagUnsetInUserConfig() {
  		setAtomicCreateCreationFlag(userConfig, "false");
  		assertFalse(new FS_POSIX().supportsAtomicCreateNewFile());
  	}
  
  	@Test
  	public void supportsAtomicCreateNewFile_shouldReturnFalseIfFlagUnsetInSystemConfig() {
  		setAtomicCreateCreationFlag(systemConfig, "false");
 		assertFalse(new FS_POSIX().supportsAtomicCreateNewFile());
 	}
 
 	private void setAtomicCreateCreationFlag(FileBasedConfig config,
 			String value) {
 		config.setString(ConfigConstants.CONFIG_CORE_SECTION, null,
 				ConfigConstants.CONFIG_KEY_SUPPORTSATOMICFILECREATION, value);
 	}
 }