// Copyright (c) 2015, 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 'package:expect/expect.dart';
import 'package:async_helper/async_helper.dart';
import 'package:compiler/src/compiler.dart';
import 'package:compiler/src/elements/elements.dart';
import 'package:compiler/src/js_backend/js_backend.dart';
import 'package:compiler/src/types/types.dart';
import 'package:compiler/src/world.dart' show ClosedWorld;
import 'type_mask_test_helper.dart';
import 'memory_compiler.dart';

const Map MEMORY_SOURCE_FILES = const {
  'main.dart': r"""
import 'package:expect/expect.dart';

int method(String arg) => arg.length;

@AssumeDynamic()
int methodAssumeDynamic(String arg) => arg.length;

@TrustTypeAnnotations()
int methodTrustTypeAnnotations(String arg) => arg.length;

@NoInline()
int methodNoInline(String arg) => arg.length;

@NoInline() @TrustTypeAnnotations()
int methodNoInlineTrustTypeAnnotations(String arg) => arg.length;

@AssumeDynamic() @TrustTypeAnnotations()
int methodAssumeDynamicTrustTypeAnnotations(String arg) => arg.length;


void main(List<String> args) {
  print(method(args[0]));
  print(methodAssumeDynamic('foo'));
  print(methodTrustTypeAnnotations(42));
  print(methodTrustTypeAnnotations("fourtyTwo"));
  print(methodNoInline('bar'));
  print(methodNoInlineTrustTypeAnnotations(42));
  print(methodNoInlineTrustTypeAnnotations("fourtyTwo"));
  print(methodAssumeDynamicTrustTypeAnnotations(null));
}
"""
};

main() {
  asyncTest(() async {
    CompilationResult result =
        await runCompiler(memorySourceFiles: MEMORY_SOURCE_FILES);
    Compiler compiler = result.compiler;
    ClosedWorld closedWorld =
        compiler.resolutionWorldBuilder.closedWorldForTesting;
    Expect.isFalse(compiler.compilationFailed, 'Unsuccessful compilation');
    JavaScriptBackend backend = compiler.backend;
    Expect.isNotNull(closedWorld.commonElements.expectNoInlineClass,
        'NoInlineClass is unresolved.');
    Expect.isNotNull(closedWorld.commonElements.expectTrustTypeAnnotationsClass,
        'TrustTypeAnnotations is unresolved.');
    Expect.isNotNull(closedWorld.commonElements.expectAssumeDynamicClass,
        'AssumeDynamicClass is unresolved.');

    void testTypeMatch(MethodElement function, TypeMask expectedParameterType,
        TypeMask expectedReturnType, TypesInferrer inferrer) {
      for (ParameterElement parameter in function.parameters) {
        TypeMask type = inferrer.getTypeOfParameter(parameter);
        Expect.equals(
            expectedParameterType, simplify(type, closedWorld), "$parameter");
      }
      if (expectedReturnType != null) {
        TypeMask type = inferrer.getReturnTypeOfMember(function);
        Expect.equals(
            expectedReturnType, simplify(type, closedWorld), "$function");
      }
    }

    void test(String name,
        {bool expectNoInline: false,
        bool expectTrustTypeAnnotations: false,
        TypeMask expectedParameterType: null,
        TypeMask expectedReturnType: null,
        bool expectAssumeDynamic: false}) {
      LibraryElement mainApp =
          compiler.frontendStrategy.elementEnvironment.mainLibrary;
      MethodElement method = mainApp.find(name);
      Expect.isNotNull(method);
      Expect.equals(expectNoInline, backend.optimizerHints.noInline(method),
          "Unexpected annotation of @NoInline on '$method'.");
      Expect.equals(
          expectTrustTypeAnnotations,
          backend.optimizerHints.trustTypeAnnotations(method),
          "Unexpected annotation of @TrustTypeAnnotations on '$method'.");
      Expect.equals(
          expectAssumeDynamic,
          backend.optimizerHints.assumeDynamic(method),
          "Unexpected annotation of @AssumeDynamic on '$method'.");
      TypesInferrer inferrer = compiler.globalInference.typesInferrerInternal;
      if (expectTrustTypeAnnotations && expectedParameterType != null) {
        testTypeMatch(
            method, expectedParameterType, expectedReturnType, inferrer);
      } else if (expectAssumeDynamic) {
        testTypeMatch(
            method, closedWorld.commonMasks.dynamicType, null, inferrer);
      }
    }

    TypeMask jsStringType = closedWorld.commonMasks.stringType;
    TypeMask jsIntType = closedWorld.commonMasks.intType;
    TypeMask coreStringType = new TypeMask.subtype(
        closedWorld.commonElements.stringClass, closedWorld);

    test('method');
    test('methodAssumeDynamic', expectAssumeDynamic: true);
    test('methodTrustTypeAnnotations',
        expectTrustTypeAnnotations: true, expectedParameterType: jsStringType);
    test('methodNoInline', expectNoInline: true);
    test('methodNoInlineTrustTypeAnnotations',
        expectNoInline: true,
        expectTrustTypeAnnotations: true,
        expectedParameterType: jsStringType,
        expectedReturnType: jsIntType);
    test('methodAssumeDynamicTrustTypeAnnotations',
        expectAssumeDynamic: true,
        expectTrustTypeAnnotations: true,
        expectedParameterType: coreStringType);
  });
}