// Copyright (c) 2017, 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/features.dart';
import 'package:expect/async_helper.dart';
import 'package:compiler/src/closure.dart';
import 'package:compiler/src/common.dart';
import 'package:compiler/src/compiler.dart';
import 'package:compiler/src/elements/entities.dart';
import 'package:compiler/src/js_backend/inferred_data.dart';
import 'package:compiler/src/js_model/element_map.dart';
import 'package:compiler/src/js_model/js_world.dart';
import 'package:kernel/ast.dart' as ir;
import '../equivalence/id_equivalence.dart';
import '../equivalence/id_equivalence_helper.dart';

main(List<String> args) {
  asyncTest(() async {
    Directory dataDir = Directory.fromUri(
      Platform.script.resolve('inference_data'),
    );
    await checkTests(
      dataDir,
      const InferenceDataComputer(),
      args: args,
      testedConfigs: allSpecConfigs,
      options: [stopAfterTypeInference],
    );
  });
}

class Tags {
  static const String functionApply = 'apply';
  static const String calledInLoop = 'loop';
  static const String cannotThrow = 'no-throw';
}

class InferenceDataComputer extends DataComputer<String> {
  const InferenceDataComputer();

  /// Compute side effects 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,
  }) {
    JClosedWorld closedWorld = compiler.backendClosedWorldForTesting!;
    JsToElementMap elementMap = closedWorld.elementMap;
    MemberDefinition definition = elementMap.getMemberDefinition(member);
    InferredDataIrComputer(
      compiler.reporter,
      actualMap,
      closedWorld,
      compiler.globalInference.resultsForTesting!.inferredData,
    ).run(definition.node);
  }

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

/// AST visitor for computing side effects data for a member.
class InferredDataIrComputer extends IrDataExtractor<String> {
  final JClosedWorld closedWorld;
  final InferredData inferredData;

  InferredDataIrComputer(
    DiagnosticReporter reporter,
    Map<Id, ActualData<String>> actualMap,
    this.closedWorld,
    this.inferredData,
  ) : super(reporter, actualMap);

  JsToElementMap get _elementMap => closedWorld.elementMap;

  ClosureData get _closureDataLookup => closedWorld.closureDataLookup;

  String getMemberValue(MemberEntity member) {
    Features features = Features();
    if (member is FunctionEntity) {
      if (inferredData.getMightBePassedToApply(member)) {
        features.add(Tags.functionApply);
      }
      if (inferredData.getCannotThrow(member)) {
        features.add(Tags.cannotThrow);
      }
    }
    if (inferredData.isCalledInLoop(member)) {
      features.add(Tags.calledInLoop);
    }
    return features.getText();
  }

  @override
  String computeMemberValue(Id id, ir.Member node) {
    return getMemberValue(_elementMap.getMember(node));
  }

  @override
  String? computeNodeValue(Id id, ir.TreeNode node) {
    if (node is ir.FunctionExpression || node is ir.FunctionDeclaration) {
      ClosureRepresentationInfo info = _closureDataLookup.getClosureInfo(
        node as ir.LocalFunction,
      );
      return getMemberValue(info.callMethod!);
    }
    return null;
  }
}