// Copyright 2013 The Flutter Authors. 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:pigeon/ast.dart';
import 'package:pigeon/pigeon_lib.dart';
import 'package:test/test.dart';

void main() {
  /// Creates a temporary file named [filename] then calls [callback] with a
  /// [File] representing that temporary directory.  The file will be deleted
  /// after the [callback] is executed.
  void _withTempFile(String filename, void Function(File) callback) {
    final Directory dir = Directory.systemTemp.createTempSync();
    final String path = '${dir.path}/$filename';
    final File file = File(path);
    file.createSync();
    try {
      callback(file);
    } finally {
      dir.deleteSync(recursive: true);
    }
  }

  ParseResults _parseSource(String source) {
    final Pigeon dartle = Pigeon.setup();
    ParseResults? results;
    _withTempFile('source.dart', (File file) {
      file.writeAsStringSync(source);
      results = dartle.parseFile(file.path);
    });
    return results!;
  }

  test('parse args - input', () {
    final PigeonOptions opts =
        Pigeon.parseArgs(<String>['--input', 'foo.dart']);
    expect(opts.input, equals('foo.dart'));
  });

  test('parse args - dart_out', () {
    final PigeonOptions opts =
        Pigeon.parseArgs(<String>['--dart_out', 'foo.dart']);
    expect(opts.dartOut, equals('foo.dart'));
  });

  test('parse args - java_package', () {
    final PigeonOptions opts =
        Pigeon.parseArgs(<String>['--java_package', 'com.google.foo']);
    expect(opts.javaOptions?.package, equals('com.google.foo'));
  });

  test('parse args - input', () {
    final PigeonOptions opts =
        Pigeon.parseArgs(<String>['--java_out', 'foo.java']);
    expect(opts.javaOut, equals('foo.java'));
  });

  test('parse args - objc_header_out', () {
    final PigeonOptions opts =
        Pigeon.parseArgs(<String>['--objc_header_out', 'foo.h']);
    expect(opts.objcHeaderOut, equals('foo.h'));
  });

  test('parse args - objc_source_out', () {
    final PigeonOptions opts =
        Pigeon.parseArgs(<String>['--objc_source_out', 'foo.m']);
    expect(opts.objcSourceOut, equals('foo.m'));
  });

  test('parse args - one_language', () {
    final PigeonOptions opts = Pigeon.parseArgs(<String>['--one_language']);
    expect(opts.oneLanguage, isTrue);
  });

  test('simple parse api', () {
    const String code = '''
class Input1 {
  String? input;
}

class Output1 {
  String? output;
}

@HostApi()
abstract class Api1 {
  Output1 doit(Input1 input);
}
''';
    final ParseResults parseResult = _parseSource(code);
    expect(parseResult.errors.length, equals(0));
    final Root root = parseResult.root;
    expect(root.classes.length, equals(2));
    expect(root.apis.length, equals(1));
    expect(root.apis[0].name, equals('Api1'));
    expect(root.apis[0].methods.length, equals(1));
    expect(root.apis[0].methods[0].name, equals('doit'));
    expect(root.apis[0].methods[0].arguments[0].name, equals('input'));
    expect(
        root.apis[0].methods[0].arguments[0].type.baseName, equals('Input1'));
    expect(root.apis[0].methods[0].returnType.baseName, equals('Output1'));

    Class? input;
    Class? output;
    for (final Class klass in root.classes) {
      if (klass.name == 'Input1') {
        input = klass;
      } else if (klass.name == 'Output1') {
        output = klass;
      }
    }
    expect(input, isNotNull);
    expect(output, isNotNull);

    expect(input?.fields.length, equals(1));
    expect(input?.fields[0].name, equals('input'));
    expect(input?.fields[0].type.baseName, equals('String'));
    expect(input?.fields[0].type.isNullable, isTrue);

    expect(output?.fields.length, equals(1));
    expect(output?.fields[0].name, equals('output'));
    expect(output?.fields[0].type.baseName, equals('String'));
    expect(output?.fields[0].type.isNullable, isTrue);
  });

  test('invalid datatype', () {
    const String source = '''
class InvalidDatatype {
  dynamic something;
}

@HostApi()
abstract class Api {
  InvalidDatatype foo();
}
''';
    final ParseResults results = _parseSource(source);
    expect(results.errors.length, 1);
    expect(results.errors[0].message, contains('InvalidDatatype'));
    expect(results.errors[0].message, contains('dynamic'));
  });

  test('enum in classes', () {
    const String code = '''
enum Enum1 {
  one,
  two,
}

class ClassWithEnum {
  Enum1? enum1;
}

@HostApi
abstract class Api {
  ClassWithEnum foo();
}
''';
    final ParseResults results = _parseSource(code);
    expect(results.errors.length, equals(0));
    expect(results.root.classes.length, equals(1));
    expect(results.root.classes[0].name, equals('ClassWithEnum'));
    expect(results.root.classes[0].fields.length, equals(1));
    expect(results.root.classes[0].fields[0].type.baseName, equals('Enum1'));
    expect(results.root.classes[0].fields[0].type.isNullable, isTrue);
    expect(results.root.classes[0].fields[0].name, equals('enum1'));
  });

  test('two methods', () {
    const String code = '''
class Input1 {
  String? input;
}

@HostApi()
abstract class ApiTwoMethods {
  Output1 method1(Input1 input);
  Output1 method2(Input1 input);
}
''';
    final ParseResults results = _parseSource(code);
    expect(results.errors.length, 0);
    expect(results.root.apis.length, 1);
    expect(results.root.apis[0].methods.length, equals(2));
    expect(results.root.apis[0].methods[0].name, equals('method1'));
    expect(results.root.apis[0].methods[1].name, equals('method2'));
  });

  test('nested', () {
    const String code = '''
class Input1 {
  String? input;
}

class Nested {
  Input1? input;
}

@HostApi()
abstract class Api {
  Nested foo();
}
''';
    final ParseResults results = _parseSource(code);
    expect(results.errors.length, equals(0));
    expect(results.root.classes.length, equals(2));
    final Class nested =
        results.root.classes.firstWhere((Class x) => x.name == 'Nested');
    expect(nested.fields.length, equals(1));
    expect(nested.fields[0].type.baseName, equals('Input1'));
    expect(nested.fields[0].type.isNullable, isTrue);
  });

  test('flutter api', () {
    const String code = '''
class Input1 {
  String? input;
}

@FlutterApi()
abstract class AFlutterApi {
  Output1 doit(Input1 input);
}
''';
    final ParseResults results = _parseSource(code);
    expect(results.errors.length, equals(0));
    expect(results.root.apis.length, equals(1));
    expect(results.root.apis[0].name, equals('AFlutterApi'));
    expect(results.root.apis[0].location, equals(ApiLocation.flutter));
  });

  test('void host api', () {
    const String code = '''
class Input1 {
  String? input;
}

@HostApi()
abstract class VoidApi {
  void doit(Input1 input);
}
''';
    final ParseResults results = _parseSource(code);
    expect(results.errors.length, equals(0));
    expect(results.root.apis.length, equals(1));
    expect(results.root.apis[0].methods.length, equals(1));
    expect(results.root.apis[0].name, equals('VoidApi'));
    expect(results.root.apis[0].methods[0].returnType.baseName, equals('void'));
  });

  test('void arg host api', () {
    const String code = '''
class Output1 {
  String? output;
}

@HostApi()
abstract class VoidArgApi {
  Output1 doit();
}
''';
    final ParseResults results = _parseSource(code);
    expect(results.errors.length, equals(0));
    expect(results.root.apis.length, equals(1));
    expect(results.root.apis[0].methods.length, equals(1));
    expect(results.root.apis[0].name, equals('VoidArgApi'));
    expect(
        results.root.apis[0].methods[0].returnType.baseName, equals('Output1'));
    expect(results.root.apis[0].methods[0].arguments.isEmpty, isTrue);
  });

  test('mockDartClass', () {
    const String code = '''
class Output1 {
  String? output;
}

@HostApi(dartHostTestHandler: 'ApiWithMockDartClassMock')
abstract class ApiWithMockDartClass {
  Output1 doit();
}
''';
    final ParseResults results = _parseSource(code);
    expect(results.errors.length, equals(0));
    expect(results.root.apis.length, equals(1));
    expect(results.root.apis[0].dartHostTestHandler,
        equals('ApiWithMockDartClassMock'));
  });

  test('only visible from nesting', () {
    const String code = '''
class OnlyVisibleFromNesting {
  String? foo;
}

class Nestor {
  OnlyVisibleFromNesting? nested;
}

@HostApi()
abstract class NestorApi {
  Nestor getit();
}
''';
    final ParseResults results = _parseSource(code);
    expect(results.errors.length, 0);
    expect(results.root.apis.length, 1);
    final List<String> classNames =
        results.root.classes.map((Class x) => x.name).toList();
    expect(classNames.length, 2);
    expect(classNames.contains('Nestor'), true);
    expect(classNames.contains('OnlyVisibleFromNesting'), true);
  });

  test('null safety flag', () {
    final PigeonOptions results =
        Pigeon.parseArgs(<String>['--dart_null_safety']);
    expect(results.dartOptions?.isNullSafe, isTrue);
  });

  test('copyright flag', () {
    final PigeonOptions results =
        Pigeon.parseArgs(<String>['--copyright_header', 'foobar.txt']);
    expect(results.copyrightHeader, 'foobar.txt');
  });

  test('Dart generater copyright flag', () {
    final Root root = Root(apis: <Api>[], classes: <Class>[], enums: <Enum>[]);
    const PigeonOptions options =
        PigeonOptions(copyrightHeader: './copyright_header.txt');
    const DartGenerator dartGenerator = DartGenerator();
    final StringBuffer buffer = StringBuffer();
    dartGenerator.generate(buffer, options, root);
    expect(buffer.toString(), startsWith('// Copyright 2013'));
  });

  test('Java generater copyright flag', () {
    final Root root = Root(apis: <Api>[], classes: <Class>[], enums: <Enum>[]);
    const PigeonOptions options = PigeonOptions(
        javaOut: 'Foo.java', copyrightHeader: './copyright_header.txt');
    const JavaGenerator javaGenerator = JavaGenerator();
    final StringBuffer buffer = StringBuffer();
    javaGenerator.generate(buffer, options, root);
    expect(buffer.toString(), startsWith('// Copyright 2013'));
  });

  test('Objc header generater copyright flag', () {
    final Root root = Root(apis: <Api>[], classes: <Class>[], enums: <Enum>[]);
    const PigeonOptions options =
        PigeonOptions(copyrightHeader: './copyright_header.txt');
    const ObjcHeaderGenerator objcHeaderGenerator = ObjcHeaderGenerator();
    final StringBuffer buffer = StringBuffer();
    objcHeaderGenerator.generate(buffer, options, root);
    expect(buffer.toString(), startsWith('// Copyright 2013'));
  });

  test('Objc source generater copyright flag', () {
    final Root root = Root(apis: <Api>[], classes: <Class>[], enums: <Enum>[]);
    const PigeonOptions options =
        PigeonOptions(copyrightHeader: './copyright_header.txt');
    const ObjcSourceGenerator objcSourceGenerator = ObjcSourceGenerator();
    final StringBuffer buffer = StringBuffer();
    objcSourceGenerator.generate(buffer, options, root);
    expect(buffer.toString(), startsWith('// Copyright 2013'));
  });

  test('nested enum', () {
    const String code = '''
enum NestedEnum { one, two }

class NestedEnum1 {
  NestedEnum? test;
}

class NestedEnum2 {
  NestedEnum1? class1;
}

class NestedEnum3 {
  NestedEnum2? class1;
  int? n;
}

@HostApi()
abstract class NestedEnumApi {
  void method(NestedEnum3 foo);
}
''';
    final ParseResults parseResult = _parseSource(code);
    expect(parseResult.errors.length, equals(0));
    expect(parseResult.root.apis.length, 1);
    expect(parseResult.root.classes.length, 3);
    expect(parseResult.root.enums.length, 1);
  });

  test('test circular references', () {
    const String code = '''
class Foo {
  Bar? bar;
}

class Bar {
  Foo? foo;
}

@HostApi()
abstract class NotificationsHostApi {
  void doit(Foo foo);
}  
''';
    final ParseResults results = _parseSource(code);
    expect(results.errors.length, 0);
    expect(results.root.classes.length, 2);
    final Class foo =
        results.root.classes.firstWhere((Class aClass) => aClass.name == 'Foo');
    expect(foo.fields.length, 1);
    expect(foo.fields[0].type.baseName, 'Bar');
  });

  test('test compilation error', () {
    const String code = 'Hello\n';
    final ParseResults results = _parseSource(code);
    expect(results.errors.length, greaterThanOrEqualTo(1));
    expect(results.errors[0].lineNumber, 1);
  });

  test('test method in data class error', () {
    const String code = '''
class Foo {
  int? x;
  int? foo() { return x; }
}

@HostApi()
abstract class Api {
  Foo doit(Foo foo);
}
''';
    final ParseResults results = _parseSource(code);
    expect(results.errors.length, 1);
    expect(results.errors[0].lineNumber, 3);
    expect(results.errors[0].message, contains('Method'));
  });

  test('test field initialization', () {
    const String code = '''
class Foo {
  int? x = 123;  
}

@HostApi()
abstract class Api {
  Foo doit(Foo foo);
}
''';
    final ParseResults results = _parseSource(code);
    expect(results.errors.length, 1);
    expect(results.errors[0].lineNumber, 2);
    expect(results.errors[0].message, contains('Initialization'));
  });

  test('test field in api error', () {
    const String code = '''
class Foo {
  int? x;
}

@HostApi()
abstract class Api {
  int? x;
  Foo doit(Foo foo);
}
''';
    final ParseResults results = _parseSource(code);
    expect(results.errors.length, 1);
    expect(results.errors[0].lineNumber, 7);
    expect(results.errors[0].message, contains('Field'));
  });

  test('constructor in data class', () {
    const String code = '''
class Foo {
  int? x;
  Foo(this.x);
}

@HostApi()
abstract class Api {
  Foo doit(Foo foo);
}
''';
    final ParseResults results = _parseSource(code);
    expect(results.errors.length, 1);
    expect(results.errors[0].lineNumber, 3);
    expect(results.errors[0].message, contains('Constructor'));
  });

  test('nullable api arguments', () {
    const String code = '''
class Foo {
  int? x;
}

@HostApi()
abstract class Api {
  Foo doit(Foo? foo);
}
''';
    final ParseResults results = _parseSource(code);
    expect(results.errors.length, 1);
    expect(results.errors[0].lineNumber, 7);
    expect(results.errors[0].message, contains('Nullable'));
  });

  test('nullable api return', () {
    const String code = '''
class Foo {
  int? x;
}

@HostApi()
abstract class Api {
  Foo? doit(Foo foo);
}
''';
    final ParseResults results = _parseSource(code);
    expect(results.errors.length, 1);
    expect(results.errors[0].lineNumber, 7);
    expect(results.errors[0].message, contains('Nullable'));
  });

  test('test invalid import', () {
    const String code = 'import \'foo.dart\';\n';
    final ParseResults results = _parseSource(code);
    expect(results.errors.length, greaterThanOrEqualTo(1));
    expect(results.errors[0].lineNumber, 1);
  });

  test('test valid import', () {
    const String code = 'import \'package:pigeon/pigeon.dart\';\n';
    final ParseResults parseResults = _parseSource(code);
    expect(parseResults.errors.length, 0);
  });

  test('error with static field', () {
    const String code = '''
class WithStaticField {
  static int? x;
  int? y;
}

@HostApi()
abstract class WithStaticFieldApi {
  void doit(WithStaticField withTemplate);
}
''';
    final ParseResults parseResult = _parseSource(code);
    expect(parseResult.errors.length, equals(1));
    expect(parseResult.errors[0].message, contains('static field'));
    expect(parseResult.errors[0].lineNumber, isNotNull);
  });

  test('parse generics', () {
    const String code = '''
class Foo {
  List<int?>? list;
}

@HostApi()
abstract class Api {
  void doit(Foo foo);
}
''';
    final ParseResults parseResult = _parseSource(code);
    expect(parseResult.errors.length, equals(0));
    final NamedType field = parseResult.root.classes[0].fields[0];
    expect(field.type.typeArguments!.length, 1);
    expect(field.type.typeArguments![0].baseName, 'int');
  });

  test('parse recursive generics', () {
    const String code = '''
class Foo {
  List<List<int?>?>? list;
}

@HostApi()
abstract class Api {
  void doit(Foo foo);
}
''';
    final ParseResults parseResult = _parseSource(code);
    expect(parseResult.errors.length, equals(0));
    final NamedType field = parseResult.root.classes[0].fields[0];
    expect(field.type.typeArguments!.length, 1);
    expect(field.type.typeArguments![0].baseName, 'List');
    expect(field.type.typeArguments![0].typeArguments![0].baseName, 'int');
  });

  test('error nonnull type argument', () {
    const String code = '''
class Foo {
  List<int> list;
}

@HostApi()
abstract class Api {
  void doit(Foo foo);
}
''';
    final ParseResults parseResult = _parseSource(code);
    expect(parseResult.errors.length, equals(1));
    expect(parseResult.errors[0].message,
        contains('Generic type arguments must be nullable'));
    expect(parseResult.errors[0].message, contains('"list"'));
    expect(parseResult.errors[0].lineNumber, 2);
  });

  test('enums argument', () {
    // TODO(gaaclarke): Make this not an error: https://github.com/flutter/flutter/issues/87307
    const String code = '''

enum Foo {
  one,
  two,
}

@HostApi()
abstract class Api {
  void doit(Foo foo);
}
''';
    final ParseResults parseResult = _parseSource(code);
    expect(parseResult.errors.length, equals(1));
    expect(parseResult.errors[0].message, contains('Enums'));
  });

  test('enums return value', () {
    // TODO(gaaclarke): Make this not an error: https://github.com/flutter/flutter/issues/87307
    const String code = '''

enum Foo {
  one,
  two,
}

@HostApi()
abstract class Api {
  Foo doit();
}
''';
    final ParseResults parseResult = _parseSource(code);
    expect(parseResult.errors.length, equals(1));
    expect(parseResult.errors[0].message, contains('Enums'));
  });

  test('return type generics', () {
    const String code = '''
@HostApi()
abstract class Api {
  List<double?> doit();
}
''';
    final ParseResults parseResult = _parseSource(code);
    expect(parseResult.root.apis[0].methods[0].returnType.baseName, 'List');
    expect(
        parseResult
            .root.apis[0].methods[0].returnType.typeArguments![0].baseName,
        'double');
    expect(
        parseResult
            .root.apis[0].methods[0].returnType.typeArguments![0].isNullable,
        isTrue);
  });

  test('argument generics', () {
    const String code = '''
@HostApi()
abstract class Api {
  void doit(List<double?> value);
}
''';
    final ParseResults parseResult = _parseSource(code);
    expect(
        parseResult.root.apis[0].methods[0].arguments[0].type.baseName, 'List');
    expect(
        parseResult.root.apis[0].methods[0].arguments[0].type.typeArguments![0]
            .baseName,
        'double');
    expect(
        parseResult.root.apis[0].methods[0].arguments[0].type.typeArguments![0]
            .isNullable,
        isTrue);
  });

  test('map generics', () {
    const String code = '''
class Foo {
  Map<String?, int?> map;
}

@HostApi()
abstract class Api {
  void doit(Foo foo);
}
''';
    final ParseResults parseResult = _parseSource(code);
    final NamedType field = parseResult.root.classes[0].fields[0];
    expect(field.type.typeArguments!.length, 2);
    expect(field.type.typeArguments![0].baseName, 'String');
    expect(field.type.typeArguments![1].baseName, 'int');
  });

  test('two arguments', () {
    const String code = '''
class Input {
  String? input;
}

@HostApi()
abstract class Api {
  void method(Input input1, Input input2);
}
''';
    final ParseResults results = _parseSource(code);
    expect(results.errors.length, 1);
    expect(results.errors[0].lineNumber, 7);
    expect(results.errors[0].message, contains('Multiple arguments'));
    // TODO(gaaclarke): Make this not an error, https://github.com/flutter/flutter/issues/86971.
    // expect(results.root.apis.length, 1);
    // expect(results.root.apis[0].methods.length, equals(1));
    // expect(results.root.apis[0].methods[0].name, equals('method'));
    // expect(results.root.apis[0].methods[0].arguments.length, 2);
  });
}