// Copyright (c) 2016, 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.

/// Check that 'dart:' libraries have their corresponding dart.library.X
/// environment variable set.

import 'dart:async';
import 'dart:io';

import '../helpers/memory_source_file_helper.dart';

import "package:async_helper/async_helper.dart";

import 'package:expect/expect.dart' show Expect;

import 'package:compiler/src/null_compiler_output.dart' show NullCompilerOutput;

import 'package:compiler/src/options.dart' show CompilerOptions;

import 'package:compiler/src/commandline_options.dart';

import 'package:compiler/src/io/source_file.dart' show Binary;

import 'package:compiler/compiler_new.dart'
    show CompilerInput, CompilerDiagnostics, Input, InputKind;

const String librariesJson = r'''
{
 "dart2js": {
   "libraries": {
    "mock.client": {"uri": "mock1.dart"},
    "mock.shared": {"uri": "mock3.dart"},
    "collection": {"uri": "collection/collection.dart"},
    "html": {"uri": "html/dart2js/html_dart2js.dart"}
   }
 },
 "dart2js_server": {
   "libraries": {
    "mock.server": {"uri": "mock2.dart"},
    "mock.shared": {"uri": "mock3.dart"},
    "collection": {"uri": "collection/collection.dart"},
    "io": {"uri": "io/io.dart"}
   }
 }
}
''';

class DummyCompilerInput implements CompilerInput {
  const DummyCompilerInput();

  Future<Input> readFromUri(Uri uri,
      {InputKind inputKind: InputKind.UTF8}) async {
    if (uri.path.endsWith("libraries.json")) {
      return new Binary(uri, librariesJson.codeUnits);
    } else {
      throw "should not be needed $uri";
    }
  }
}

class DummyCompilerDiagnostics implements CompilerDiagnostics {
  const DummyCompilerDiagnostics();

  report(code, uri, begin, end, text, kind) {
    throw "should not be needed";
  }
}

final platformDir = Uri.parse(Platform.resolvedExecutable).resolve('.');

class CustomCompiler extends CompilerImpl {
  CustomCompiler(List<String> options, Map<String, String> environment)
      : super(
            const DummyCompilerInput(),
            const NullCompilerOutput(),
            const DummyCompilerDiagnostics(),
            CompilerOptions.parse(
                ['--platform-binaries=$platformDir']..addAll(options),
                librariesSpecificationUri:
                    Uri.base.resolve("sdk/lib/libraries.json"))
              ..environment = environment);
}

runTest() async {
  var compiler = new CustomCompiler([], {});

  await compiler.setupSdk();

  // Core libraries are always present.
  Expect.equals("true", compiler.fromEnvironment("dart.library.collection"));
  // Non-existing entries in the environment return 'null'.
  Expect.isNull(compiler.fromEnvironment("not in env"));
  // Check for client libraries (default if there are no flags to the compiler).
  Expect.equals("true", compiler.fromEnvironment("dart.library.mock.client"));
  Expect.equals("true", compiler.fromEnvironment("dart.library.html"));
  // Check for shared libraries..
  Expect.equals("true", compiler.fromEnvironment("dart.library.mock.shared"));
  // Check server libraries are not present.
  Expect.equals(null, compiler.fromEnvironment("dart.library.mock.server"));
  Expect.equals(null, compiler.fromEnvironment("dart.library.io"));

  compiler = new CustomCompiler([Flags.serverMode], {});

  await compiler.setupSdk();

  // Core libraries are always present.
  Expect.equals("true", compiler.fromEnvironment("dart.library.collection"));
  // Non-existing entries in the environment return 'null'.
  Expect.isNull(compiler.fromEnvironment("not in env"));
  // Check client libraries are not present.
  Expect.equals(null, compiler.fromEnvironment("dart.library.mock.client"));
  Expect.equals(null, compiler.fromEnvironment("dart.library.html"));
  // Check for shared libraries..
  Expect.equals("true", compiler.fromEnvironment("dart.library.mock.shared"));
  // Check for server libraries.
  Expect.equals("true", compiler.fromEnvironment("dart.library.mock.server"));
  Expect.equals("true", compiler.fromEnvironment("dart.library.io"));

  // Check that user-defined env-variables win.
  compiler = new CustomCompiler([],
      {'dart.library.collection': "false", 'dart.library.mock.client': "foo"});

  await compiler.setupSdk();

  Expect.equals("false", compiler.fromEnvironment("dart.library.collection"));
  Expect.equals("foo", compiler.fromEnvironment("dart.library.mock.client"));
}

main() {
  asyncStart();
  runTest().then((_) {
    asyncEnd();
  });
}