// Copyright (c) 2019, 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:_fe_analyzer_shared/src/testing/id_testing.dart';
import 'package:compiler/src/commandline_options.dart';
import 'package:compiler/src/compiler.dart';
import 'package:compiler/src/diagnostics/diagnostic_listener.dart';
import 'package:compiler/src/elements/entities.dart';
import 'package:compiler/src/kernel/element_map.dart';
import 'package:compiler/src/kernel/kernel_strategy.dart';
import 'package:expect/async_helper.dart';
import 'package:kernel/ast.dart' as ir;
import 'package:kernel/class_hierarchy.dart' as ir;
import 'package:kernel/core_types.dart' as ir;
import 'package:kernel/type_environment.dart' as ir;
import '../equivalence/id_equivalence.dart';
import '../equivalence/id_equivalence_helper.dart';
import '../helpers/shared_helper.dart';

main(List<String> args) {
  asyncTest(() async {
    Directory dataDir = Directory.fromUri(
      Platform.script.resolve(
        '../../../../pkg/_fe_analyzer_shared/test/constants/data',
      ),
    );
    TestConfig testConfig = TestConfig(dart2jsMarker, 'dart2js', [
      '${Flags.enableLanguageExperiments}=digit-separators',
    ]);
    await checkTests<String>(
      dataDir,
      ConstantDataComputer(),
      args: args,
      testedConfigs: [testConfig],
    );
  });
}

class ConstantDataComputer extends DataComputer<String> {
  ir.TypeEnvironment? _typeEnvironment;

  ir.TypeEnvironment getTypeEnvironment(KernelToElementMap elementMap) {
    if (_typeEnvironment == null) {
      ir.Component component = elementMap.env.mainComponent;
      ir.CoreTypes coreTypes = ir.CoreTypes(component);
      _typeEnvironment = ir.TypeEnvironment(
        coreTypes,
        ir.ClassHierarchy(component, coreTypes),
      );
    }
    return _typeEnvironment!;
  }

  /// Compute type inference data for [member] from kernel based inference.
  ///
  /// Fills [actualMap] with the data.
  @override
  void computeMemberData(
    Compiler compiler,
    MemberEntity member,
    Map<Id, ActualData<String>> actualMap, {
    bool verbose = false,
  }) {
    KernelFrontendStrategy frontendStrategy = compiler.frontendStrategy;
    KernelToElementMap elementMap = frontendStrategy.elementMap;
    ir.Member node = elementMap.getMemberNode(member);
    ConstantDataExtractor(
      compiler.reporter,
      actualMap,
      elementMap,
      member,
    ).run(node);
  }

  @override
  bool get supportsErrors => true;

  @override
  String computeErrorData(
    Compiler compiler,
    Id id,
    List<CollectedMessage> errors,
  ) {
    return errors.map((c) => c.message!.message).join(',');
  }

  @override
  bool get testFrontend => true;

  @override
  DataInterpreter<String> get dataValidator => const StringDataInterpreter();
}

/// IR visitor for computing inference data for a member.
class ConstantDataExtractor extends IrDataExtractor<String> {
  final KernelToElementMap elementMap;
  final MemberEntity member;

  ConstantDataExtractor(
    DiagnosticReporter reporter,
    Map<Id, ActualData<String>> actualMap,
    this.elementMap,
    this.member,
  ) : super(reporter, actualMap);

  @override
  String? computeNodeValue(Id id, ir.TreeNode node) {
    if (node is ir.ConstantExpression) {
      return constantToText(
        elementMap.types,
        elementMap.getConstantValue(node)!,
      );
    }
    return null;
  }
}