/*
 * Copyright 2007 The Closure Compiler Authors.
 *
 * 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.
 */

package com.google.javascript.jscomp;

import static com.google.common.truth.Truth.assertThat;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
import junit.framework.TestCase;


public final class SourceFileTest extends TestCase {

  private static class ResetableSourceFile extends SourceFile.Preloaded {
    ResetableSourceFile(String fileName, String code) {
      super(fileName, null, code);
    }

    void updateCode(String code) {
      setCode(code);
    }
  }

  /** Tests that keys are assigned sequentially. */
  public void testLineOffset() throws Exception {
    ResetableSourceFile sf = new ResetableSourceFile("test.js", "'1';\n'2';\n'3'\n");
    assertThat(sf.getLineOffset(1)).isEqualTo(0);
    assertThat(sf.getLineOffset(2)).isEqualTo(5);
    assertThat(sf.getLineOffset(3)).isEqualTo(10);

    sf.updateCode("'100';\n'200;'\n'300'\n");
    assertThat(sf.getLineOffset(1)).isEqualTo(0);
    assertThat(sf.getLineOffset(2)).isEqualTo(7);
    assertThat(sf.getLineOffset(3)).isEqualTo(14);
  }

  public void testCachingFile() throws IOException {
    // Setup environment.
    String expectedContent = "// content content content";
    String newExpectedContent = "// new content new content new content";
    Path jsFile = Files.createTempFile("test", ".js");
    Files.write(jsFile, expectedContent.getBytes(StandardCharsets.UTF_8));
    SourceFile sourceFile = SourceFile.fromFile(jsFile.toFile());

    // Verify initial state.
    assertEquals(expectedContent, sourceFile.getCode());

    // Perform a change.
    Files.write(jsFile, newExpectedContent.getBytes(StandardCharsets.UTF_8));
    sourceFile.clearCachedSource();

    // Verify final state.
    assertEquals(newExpectedContent, sourceFile.getCode());
  }

  public void testCachingZipFile() throws IOException {
    // Setup environment.
    String expectedContent = "// content content content";
    String newExpectedContent = "// new content new content new content";
    Path jsZipFile = Files.createTempFile("test", ".js.zip");
    createZipWithContent(jsZipFile, expectedContent);
    SourceFile zipSourceFile =
        SourceFile.fromZipEntry(
            jsZipFile.toString(),
            jsZipFile.toAbsolutePath().toString(),
            "foo.js",
            StandardCharsets.UTF_8);

    // Verify initial state.
    assertEquals(expectedContent, zipSourceFile.getCode());

    // Perform a change.
    createZipWithContent(jsZipFile, newExpectedContent);
    zipSourceFile.clearCachedSource();

    // Verify final state.
    assertEquals(newExpectedContent, zipSourceFile.getCode());
  }

  private static void createZipWithContent(Path zipFile, String content)
      throws IOException, FileNotFoundException {
    ZipOutputStream zos;
    if (zipFile.toFile().exists()) {
      zipFile.toFile().delete();
    }
    zipFile.toFile().createNewFile();
    zos = new ZipOutputStream(new FileOutputStream(zipFile.toFile()));
    zos.putNextEntry(new ZipEntry("foo.js"));
    zos.write(content.getBytes(StandardCharsets.UTF_8));
    zos.closeEntry();
    zos.close();
  }
}