// 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.

/// Pub-specific test descriptors.
import 'package:oauth2/oauth2.dart' as oauth2;
import 'package:pub/src/io.dart';
import 'package:pub/src/package_config.dart';
import 'package:test_descriptor/test_descriptor.dart';
import 'package:meta/meta.dart';
import 'package:path/path.dart' as p;

import 'descriptor/git.dart';
import 'descriptor/packages.dart';
import 'descriptor/tar.dart';
import 'test_pub.dart';

export 'package:test_descriptor/test_descriptor.dart';
export 'descriptor/git.dart';
export 'descriptor/packages.dart';
export 'descriptor/tar.dart';

/// Creates a new [GitRepoDescriptor] with [name] and [contents].
GitRepoDescriptor git(String name, [Iterable<Descriptor> contents]) =>
    GitRepoDescriptor(name, contents ?? <Descriptor>[]);

/// Creates a new [TarFileDescriptor] with [name] and [contents].
TarFileDescriptor tar(String name, [Iterable<Descriptor> contents]) =>
    TarFileDescriptor(name, contents ?? <Descriptor>[]);

/// Describes a package that passes all validation.
Descriptor get validPackage => dir(appPath, [
      libPubspec('test_pkg', '1.0.0', sdk: '>=1.8.0 <=2.0.0'),
      file('LICENSE', 'Eh, do what you want.'),
      file('README.md', "This package isn't real."),
      file('CHANGELOG.md', '# 1.0.0\nFirst version\n'),
      dir('lib', [file('test_pkg.dart', 'int i = 1;')])
    ]);

/// Returns a descriptor of a snapshot that can't be run by the current VM.
///
/// This snapshot was generated using version 2.0.0-dev.58.0 of the VM.
FileDescriptor outOfDateSnapshot(String name) =>
    file(name, readBinaryFile(testAssetPath('out-of-date.snapshot.dart2')));

/// Describes a file named `pubspec.yaml` with the given YAML-serialized
/// [contents], which should be a serializable object.
///
/// [contents] may contain [Future]s that resolve to serializable objects,
/// which may in turn contain [Future]s recursively.
Descriptor pubspec(Map<String, Object> contents) =>
    file('pubspec.yaml', yaml(contents));

/// Describes a file named `pubspec.yaml` for an application package with the
/// given [dependencies].
Descriptor appPubspec([Map dependencies]) {
  var map = <String, dynamic>{'name': 'myapp'};
  if (dependencies != null) map['dependencies'] = dependencies;
  return pubspec(map);
}

/// Describes a file named `pubspec.yaml` for a library package with the given
/// [name], [version], and [deps]. If "sdk" is given, then it adds an SDK
/// constraint on that version.
Descriptor libPubspec(String name, String version,
    {Map deps, Map devDeps, String sdk}) {
  var map = packageMap(name, version, deps, devDeps);
  if (sdk != null) map['environment'] = {'sdk': sdk};
  return pubspec(map);
}

/// Describes a directory named `lib` containing a single dart file named
/// `<name>.dart` that contains a line of Dart code.
Descriptor libDir(String name, [String code]) {
  // Default to printing the name if no other code was given.
  code ??= name;
  return dir('lib', [file('$name.dart', 'main() => "$code";')]);
}

/// Describes a directory whose name ends with a hyphen followed by an
/// alphanumeric hash.
Descriptor hashDir(String name, Iterable<Descriptor> contents) => pattern(
    RegExp("$name${r'-[a-f0-9]+'}"), (dirName) => dir(dirName, contents));

/// Describes a directory for a Git package. This directory is of the form
/// found in the revision cache of the global package cache.
Descriptor gitPackageRevisionCacheDir(String name, [int modifier]) {
  var value = name;
  if (modifier != null) value = '$name $modifier';
  return hashDir(name, [libDir(name, value)]);
}

/// Describes a directory for a Git package. This directory is of the form
/// found in the repo cache of the global package cache.
Descriptor gitPackageRepoCacheDir(String name) =>
    hashDir(name, [dir('objects'), dir('refs')]);

/// Describes the global package cache directory containing all the given
/// [packages], which should be name/version pairs. The packages will be
/// validated against the format produced by the mock package server.
///
/// A package's value may also be a list of versions, in which case all
/// versions are expected to be downloaded.
///
/// If [port] is passed, it's used as the port number of the local hosted server
/// that this cache represents. It defaults to [globalServer.port].
///
/// If [includePubspecs] is `true`, then pubspecs will be created for each
/// package. Defaults to `false` so that the contents of pubspecs are not
/// validated since they will often lack the dependencies section that the
/// real pubspec being compared against has. You usually only need to pass
/// `true` for this if you plan to call [create] on the resulting descriptor.
Descriptor cacheDir(Map packages, {int port, bool includePubspecs = false}) {
  var contents = <Descriptor>[];
  packages.forEach((name, versions) {
    if (versions is! List) versions = [versions];
    for (var version in versions) {
      var packageContents = [libDir(name, '$name $version')];
      if (includePubspecs) {
        packageContents.add(libPubspec(name, version));
      }
      contents.add(dir('$name-$version', packageContents));
    }
  });

  return hostedCache(contents, port: port);
}

/// Describes the main cache directory containing cached hosted packages
/// downloaded from the mock package server.
///
/// If [port] is passed, it's used as the port number of the local hosted server
/// that this cache represents. It defaults to [globalServer.port].
Descriptor hostedCache(Iterable<Descriptor> contents, {int port}) {
  return dir(cachePath, [
    dir('hosted', [dir('localhost%58${port ?? globalServer.port}', contents)])
  ]);
}

/// Describes the file in the system cache that contains the client's OAuth2
/// credentials. The URL "/token" on [server] will be used as the token
/// endpoint for refreshing the access token.
Descriptor credentialsFile(PackageServer server, String accessToken,
    {String refreshToken, DateTime expiration}) {
  return dir(cachePath, [
    file(
        'credentials.json',
        oauth2.Credentials(accessToken,
                refreshToken: refreshToken,
                tokenEndpoint: Uri.parse(server.url).resolve('/token'),
                scopes: [
                  'openid',
                  'https://www.googleapis.com/auth/userinfo.email',
                ],
                expiration: expiration)
            .toJson())
  ]);
}

/// Describes the application directory, containing only a pubspec specifying
/// the given [dependencies].
DirectoryDescriptor appDir([Map dependencies]) =>
    dir(appPath, [appPubspec(dependencies)]);

/// Describes a `.packages` file.
///
/// [dependencies] maps package names to strings describing where the packages
/// are located on disk. If the strings are semantic versions, then the packages
/// are located in the system cache; otherwise, the strings are interpreted as
/// relative `file:` URLs.
///
/// Validation checks that the `.packages` file exists, has the expected
/// entries (one per key in [dependencies]), each with a path that contains
/// either the version string (for a reference to the pub cache) or a
/// path to a path dependency, relative to the application directory.
Descriptor packagesFile([Map<String, String> dependencies]) =>
    PackagesFileDescriptor(dependencies);

/// Describes a `.dart_tools/package_config.json` file.
///
/// [dependencies] is a list of packages included in the file.
///
/// Validation checks that the `.dart_tools/package_config.json` file exists,
/// has the expected entries (one per key in [dependencies]), each with a path
/// that matches the `rootUri` of that package.
Descriptor packageConfigFile(List<PackageConfigEntry> packages) =>
    PackageConfigFileDescriptor(packages);

/// Create a [PackageConfigEntry] which assumes package with [name] is either
/// a cached package with given [version] or a path dependency at given [path].
PackageConfigEntry packageConfigEntry({
  @required String name,
  String version,
  String path,
  String languageVersion,
}) {
  if (version != null && path != null) {
    throw ArgumentError.value(
        path, 'path', 'Only one of "version" and "path" can be provided');
  }
  if (version == null && path == null) {
    throw ArgumentError.value(
        version, 'version', 'Either "version" or "path" must be given');
  }
  Uri rootUri;
  if (version != null) {
    rootUri = p.toUri(globalPackageServer.pathInCache(name, version));
  } else {
    rootUri = p.toUri(p.join('..', path));
  }
  return PackageConfigEntry(
    name: name,
    rootUri: rootUri,
    packageUri: Uri(path: 'lib/'),
    languageVersion: languageVersion,
  );
}

/// Describes a `.packages` file in the application directory, including the
/// implicit entry for the app itself.
Descriptor appPackagesFile(Map<String, String> dependencies) {
  var copied = Map<String, String>.from(dependencies);
  copied['myapp'] = '.';
  return dir(appPath, [packagesFile(copied)]);
}