/*
 * Licensed 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.
 *
 * Copyright 2012-2018 the original author or authors.
 */
package org.assertj.core.internal.files;

import static java.lang.String.format;
import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.util.Arrays.array;

import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.List;

import org.assertj.core.internal.Diff;
import org.assertj.core.util.TextFileWriter;
import org.assertj.core.util.diff.Delta;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TemporaryFolder;

/**
 * Tests for <code>{@link Diff#diff(File, String, java.nio.charset.Charset)}</code>.
 * 
 * @author Olivier Michallat
 */
public class Diff_diff_File_String_Test {

  @Rule
  public TemporaryFolder folder = new TemporaryFolder();

  private static Diff diff;
  private static TextFileWriter writer;

  @BeforeClass
  public static void setUpOnce() {
    diff = new Diff();
    writer = TextFileWriter.instance();
  }

  private File actual;

  @Before
  public void setUp() throws IOException {
    actual = folder.newFile("actual.txt");
  }

  @Test
  public void should_return_empty_diff_list_if_file_and_string_have_equal_content() throws IOException {
    String[] content = array("line0", "line1");
    writer.write(actual, content);
    String expected = String.format("line0%nline1");
    List<Delta<String>> diffs = diff.diff(actual, expected, Charset.defaultCharset());
    assertThat(diffs).isEmpty();
  }

  @Test
  public void should_return_diffs_if_file_and_string_do_not_have_equal_content() throws IOException {
    writer.write(actual, StandardCharsets.UTF_8, "Touché");
    String expected = "Touché";
    List<Delta<String>> diffs = diff.diff(actual, expected, StandardCharsets.ISO_8859_1);
    assertThat(diffs).hasSize(1);
    assertThat(diffs.get(0)).hasToString(format("Changed content at line 1:%n"
                                                + "expecting:%n"
                                                + "  [\"Touché\"]%n"
                                                + "but was:%n"
                                                + "  [\"TouchÃ©\"]%n"));
  }

  @Test
  public void should_return_diffs_if_content_of_actual_is_shorter_than_content_of_expected() throws IOException {
    writer.write(actual, "line_0");
    String expected = String.format("line_0%nline_1");
    List<Delta<String>> diffs = diff.diff(actual, expected, Charset.defaultCharset());
    assertThat(diffs).hasSize(1);
    assertThat(diffs.get(0)).hasToString(format("Missing content at line 2:%n"
                                                + "  [\"line_1\"]%n"));
  }

  @Test
  public void should_return_diffs_if_content_of_actual_is_longer_than_content_of_expected() throws IOException {
    writer.write(actual, "line_0", "line_1");
    String expected = "line_0";
    List<Delta<String>> diffs = diff.diff(actual, expected, Charset.defaultCharset());
    assertThat(diffs).hasSize(1);
    assertThat(diffs.get(0)).hasToString(format("Extra content at line 2:%n"
                                                + "  [\"line_1\"]%n"));
  }
}
