// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import "dart:io";

import "package:async_helper/async_helper.dart";
import "package:expect/expect.dart";

createLink(String dst, String link, void callback()) {
  new Link(link).create(dst).then((_) => callback());
}


testFileExistsCreate() {
  var temp = Directory.systemTemp.createTempSync('dart_file_system_links');
  var x = '${temp.path}${Platform.pathSeparator}x';
  var y = '${temp.path}${Platform.pathSeparator}y';
  createLink(x, y, () {
    Expect.isFalse(new File(y).existsSync());
    Expect.isFalse(new File(x).existsSync());
    Expect.isTrue(FileSystemEntity.isLinkSync(y));
    Expect.isFalse(FileSystemEntity.isLinkSync(x));
    Expect.equals(FileSystemEntityType.NOT_FOUND, FileSystemEntity.typeSync(y));
    Expect.equals(FileSystemEntityType.NOT_FOUND, FileSystemEntity.typeSync(x));
    Expect.equals(FileSystemEntityType.LINK,
                  FileSystemEntity.typeSync(y, followLinks: false));
    Expect.equals(FileSystemEntityType.NOT_FOUND,
                  FileSystemEntity.typeSync(x, followLinks: false));
    Expect.equals(x, new Link(y).targetSync());

    new File(y).createSync();
    Expect.isTrue(new File(y).existsSync());
    Expect.isTrue(new File(x).existsSync());
    Expect.isTrue(FileSystemEntity.isLinkSync(y));
    Expect.isFalse(FileSystemEntity.isLinkSync(x));
    Expect.isTrue(FileSystemEntity.isFileSync(y));
    Expect.isTrue(FileSystemEntity.isFileSync(x));
    Expect.equals(FileSystemEntityType.FILE, FileSystemEntity.typeSync(y));
    Expect.equals(FileSystemEntityType.FILE, FileSystemEntity.typeSync(x));
    Expect.equals(FileSystemEntityType.LINK,
                  FileSystemEntity.typeSync(y, followLinks: false));
    Expect.equals(FileSystemEntityType.FILE,
                  FileSystemEntity.typeSync(x, followLinks: false));
    Expect.equals(x, new Link(y).targetSync());

    new File(x).deleteSync();
    new Directory(x).createSync();
    Expect.isTrue(FileSystemEntity.isLinkSync(y));
    Expect.isFalse(FileSystemEntity.isLinkSync(x));
    Expect.isTrue(FileSystemEntity.isDirectorySync(y));
    Expect.isTrue(FileSystemEntity.isDirectorySync(x));
    Expect.equals(FileSystemEntityType.DIRECTORY, FileSystemEntity.typeSync(y));
    Expect.equals(FileSystemEntityType.DIRECTORY, FileSystemEntity.typeSync(x));
    Expect.equals(FileSystemEntityType.LINK,
                  FileSystemEntity.typeSync(y, followLinks: false));
    Expect.equals(FileSystemEntityType.DIRECTORY,
                  FileSystemEntity.typeSync(x, followLinks: false));
    Expect.equals(x, new Link(y).targetSync());

    new Link(y).deleteSync();
    Expect.isFalse(FileSystemEntity.isLinkSync(y));
    Expect.isFalse(FileSystemEntity.isLinkSync(x));
    Expect.equals(FileSystemEntityType.NOT_FOUND, FileSystemEntity.typeSync(y));
    Expect.equals(FileSystemEntityType.DIRECTORY, FileSystemEntity.typeSync(x));
    Expect.throws(() => new Link(y).targetSync());

    temp.deleteSync(recursive: true);
  });
}


testFileDelete() {
  var temp = Directory.systemTemp.createTempSync('dart_file_system_links');
  var x = '${temp.path}${Platform.pathSeparator}x';
  var y = '${temp.path}${Platform.pathSeparator}y';
  new File(x).createSync();
  createLink(x, y, () {
    Expect.isTrue(new File(x).existsSync());
    Expect.isTrue(new File(y).existsSync());
    new File(y).deleteSync();
    Expect.isTrue(new File(x).existsSync());
    Expect.isFalse(new File(y).existsSync());
    createLink(x, y, () {
      Expect.isTrue(new File(x).existsSync());
      Expect.isTrue(new File(y).existsSync());
      new File(y).deleteSync();
      Expect.isTrue(new File(x).existsSync());
      Expect.isFalse(new File(y).existsSync());
      temp.deleteSync(recursive: true);
    });
  });
}


testFileWriteRead() {
  var temp = Directory.systemTemp.createTempSync('dart_file_system_links');
  var x = '${temp.path}${Platform.pathSeparator}x';
  var y = '${temp.path}${Platform.pathSeparator}y';
  new File(x).createSync();
  createLink(x, y, () {
    var data = "asdf".codeUnits;
    var output = new File(y).openWrite(mode: FileMode.WRITE);
    output.add(data);
    output.close();
    output.done.then((_) {
      var read = new File(y).readAsBytesSync();
      Expect.listEquals(data, read);
      var read2 = new File(x).readAsBytesSync();
      Expect.listEquals(data, read2);
      temp.deleteSync(recursive: true);
    });
  });
}


testDirectoryExistsCreate() {
  var temp = Directory.systemTemp.createTempSync('dart_file_system_links');
  var x = '${temp.path}${Platform.pathSeparator}x';
  var y = '${temp.path}${Platform.pathSeparator}y';
  createLink(x, y, () {
    Expect.isFalse(new Directory(x).existsSync());
    Expect.isFalse(new Directory(y).existsSync());
    Expect.throws(new Directory(y).createSync);
    temp.deleteSync(recursive: true);
  });
}


testDirectoryDelete() {
  var temp = Directory.systemTemp.createTempSync('dart_file_system_links');
  var temp2 = Directory.systemTemp.createTempSync('dart_file_system_links');
  var y = '${temp.path}${Platform.pathSeparator}y';
  var x = '${temp2.path}${Platform.pathSeparator}x';
  new File(x).createSync();
  createLink(temp2.path, y, () {
    var link = new Directory(y);
    Expect.isTrue(link.existsSync());
    Expect.isTrue(temp2.existsSync());
    link.deleteSync();
    Expect.isFalse(link.existsSync());
    Expect.isTrue(temp2.existsSync());
    createLink(temp2.path, y, () {
      Expect.isTrue(link.existsSync());
      temp.deleteSync(recursive: true);
      Expect.isFalse(link.existsSync());
      Expect.isTrue(temp2.existsSync());
      Expect.isTrue(new File(x).existsSync());
      temp2.deleteSync(recursive: true);
    });
  });
}


testDirectoryListing() {
  asyncStart();
  var temp = Directory.systemTemp.createTempSync('dart_file_system_links');
  var temp2 = Directory.systemTemp.createTempSync('dart_file_system_links');
  var y = '${temp.path}${Platform.pathSeparator}y';
  var x = '${temp2.path}${Platform.pathSeparator}x';
  new File(x).createSync();
  createLink(temp2.path, y, () {
    var files = [];
    var dirs = [];
    for (var entry in temp.listSync(recursive:true)) {
      if (entry is File) {
        files.add(entry.path);
      } else {
        Expect.isTrue(entry is Directory);
        dirs.add(entry.path);
      }
    }
    Expect.equals(1, files.length);
    Expect.isTrue(files[0].endsWith('$y${Platform.pathSeparator}x'));
    Expect.equals(1, dirs.length);
    Expect.isTrue(dirs[0].endsWith(y));

    files = [];
    dirs = [];
    var lister = temp.list(recursive: true).listen(
        (entity) {
          if (entity is File) {
            files.add(entity.path);
          } else {
            Expect.isTrue(entity is Directory);
            dirs.add(entity.path);
          }
        },
        onDone: () {
          Expect.equals(1, files.length);
          Expect.isTrue(files[0].endsWith('$y${Platform.pathSeparator}x'));
          Expect.equals(1, dirs.length);
          Expect.isTrue(dirs[0].endsWith(y));
          temp.deleteSync(recursive: true);
          temp2.deleteSync(recursive: true);
          asyncEnd();
        });
  });
}


testDirectoryListingBrokenLink() {
  asyncStart();
  var temp = Directory.systemTemp.createTempSync('dart_file_system_links');
  var x = '${temp.path}${Platform.pathSeparator}x';
  var link = '${temp.path}${Platform.pathSeparator}link';
  var doesNotExist = 'this_thing_does_not_exist';
  new File(x).createSync();
  createLink(doesNotExist, link, () {
    temp.listSync(recursive: true);  // No exceptions.
    var files = [];
    var dirs = [];
    var links = [];
    var errors = [];
    temp.list(recursive: true).listen(
        (entity) {
          if (entity is File) {
            files.add(entity.path);
          } else if (entity is Link) {
            links.add(entity.path);
          } else {
            Expect.isTrue(entity is Directory);
            dirs.add(entity.path);
          }
        },
        onError: (e) => errors.add(e),
        onDone: () {
          Expect.equals(1, files.length);
          Expect.isTrue(files[0].endsWith(x));
          Expect.equals(1, links.length);
          Expect.isTrue(links[0].endsWith(link));
          Expect.equals(0, dirs.length);
          Expect.equals(0, errors.length);
          temp.deleteSync(recursive: true);
          asyncEnd();
        });
  });
}


main() {
  // Links on Windows are tested by windows_file_system_[async_]links_test.
  if (Platform.operatingSystem != 'windows') {
    testFileExistsCreate();
    testFileDelete();
    testFileWriteRead();
    testDirectoryExistsCreate();
    testDirectoryDelete();
    testDirectoryListing();
    testDirectoryListingBrokenLink();
  }
}