// 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.dart';
import 'package:_fe_analyzer_shared/src/testing/id_testing.dart';
import 'package:analyzer/dart/ast/ast.dart';
import 'package:analyzer/dart/element/element.dart';
import 'package:analyzer/dart/element/type.dart';
import 'package:analyzer/diagnostic/diagnostic.dart';
import 'package:analyzer/src/dart/analysis/testing_data.dart';
import 'package:analyzer/src/dart/element/inheritance_manager3.dart';
import 'package:analyzer/src/util/ast_data_extractor.dart';

import '../util/id_testing_helper.dart';

main(List<String> args) {
  Directory dataDir = Directory.fromUri(
    Platform.script.resolve(
      '../../../_fe_analyzer_shared/test/inheritance/data',
    ),
  );
  return runTests<String>(
    dataDir,
    args: args,
    createUriForFileName: createUriForFileName,
    onFailure: onFailure,
    runTest: runTestFor(const _InheritanceDataComputer(), [
      analyzerDefaultConfig,
    ]),
  );
}

String supertypeToString(InterfaceType type) {
  var sb = StringBuffer();
  sb.write(type.element.name);
  if (type.typeArguments.isNotEmpty) {
    sb.write('<');
    var comma = '';
    for (var typeArgument in type.typeArguments) {
      sb.write(comma);
      sb.write(typeArgument.getDisplayString());
      comma = ', ';
    }
    sb.write('>');
  }
  return sb.toString();
}

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

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

  @override
  bool get supportsErrors => true;

  @override
  String computeErrorData(
    TestConfig config,
    TestingData testingData,
    Id id,
    List<Diagnostic> diagnostics,
  ) {
    return diagnostics.map((e) => e.diagnosticCode).join(',');
  }

  @override
  void computeUnitData(
    TestingData testingData,
    CompilationUnit unit,
    Map<Id, ActualData<String>> actualMap,
  ) {
    _InheritanceDataExtractor(
      unit.declaredFragment!.source.uri,
      actualMap,
    ).run(unit);
  }
}

class _InheritanceDataExtractor extends AstDataExtractor<String> {
  final inheritance = InheritanceManager3();

  _InheritanceDataExtractor(super.uri, super.actualMap);

  @override
  String? computeElementValue(Id id, Element element) {
    return null;
  }

  @override
  void computeForClass(Declaration node, Id? id) {
    super.computeForClass(node, id);
    if (node is ClassDeclaration) {
      var element = node.declaredFragment!.element;

      void registerMember(
        MemberId id,
        int offset,
        Object object,
        DartType type,
      ) {
        registerValue(uri, offset, id, type.getDisplayString(), object);
      }

      var interface = inheritance.getInterface(element);
      for (var name in interface.map.keys) {
        var executable = interface.map[name]!;

        var enclosingClass = executable.enclosingElement as InterfaceElement;
        if (enclosingClass is ClassElement && enclosingClass.isDartCoreObject) {
          continue;
        }

        var id = MemberId.internal(name.name, className: element.name);

        var offset = enclosingClass == element
            ? executable.firstFragment.nameOffset
            : element.firstFragment.nameOffset;
        offset ??= -1;

        DartType type;
        if (executable is MethodElement) {
          type = executable.type;
        } else if (executable is GetterElement) {
          type = executable.returnType;
        } else if (executable is SetterElement) {
          type = executable.formalParameters.first.type;
        } else {
          throw UnimplementedError('(${executable.runtimeType}) $executable');
        }

        registerMember(id, offset, executable, type);
      }
    }
  }

  @override
  String? computeNodeValue(Id id, AstNode node) {
    if (node is ClassDeclaration) {
      var cls = node.declaredFragment!.element;
      var supertypes = <String>[];
      supertypes.add(supertypeToString(cls.thisType));
      for (var supertype in cls.allSupertypes) {
        supertypes.add(supertypeToString(supertype));
      }
      supertypes.sort();
      return supertypes.join(',');
    }
    return null;
  }
}
