// 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 'package:pigeon/ast.dart';
import 'package:pigeon/dart_generator.dart';
import 'package:pigeon/generator_tools.dart';
import 'package:test/test.dart';

void main() {
  test('gen one class', () {
    final Class klass = Class(
      name: 'Foobar',
      fields: <Field>[
        Field(
          name: 'field1',
          dataType: 'dataType1',
          isNullable: true,
        ),
      ],
    );
    final Root root = Root(
      apis: <Api>[],
      classes: <Class>[klass],
      enums: <Enum>[],
    );
    final StringBuffer sink = StringBuffer();
    generateDart(const DartOptions(isNullSafe: false), root, sink);
    final String code = sink.toString();
    expect(code, contains('class Foobar'));
    expect(code, contains('  dataType1 field1;'));
  });

  test('gen one enum', () {
    final Enum anEnum = Enum(
      name: 'Foobar',
      members: <String>[
        'one',
        'two',
      ],
    );
    final Root root = Root(
      apis: <Api>[],
      classes: <Class>[],
      enums: <Enum>[anEnum],
    );
    final StringBuffer sink = StringBuffer();
    generateDart(const DartOptions(isNullSafe: false), root, sink);
    final String code = sink.toString();
    expect(code, contains('enum Foobar'));
    expect(code, contains('  one,'));
    expect(code, contains('  two,'));
  });

  test('gen one host api', () {
    final Root root = Root(apis: <Api>[
      Api(name: 'Api', location: ApiLocation.host, methods: <Method>[
        Method(
          name: 'doSomething',
          argType: 'Input',
          isArgNullable: false,
          returnType: 'Output',
          isAsynchronous: false,
        )
      ])
    ], classes: <Class>[
      Class(name: 'Input', fields: <Field>[
        Field(
          name: 'input',
          dataType: 'String',
          isNullable: true,
        )
      ]),
      Class(name: 'Output', fields: <Field>[
        Field(
          name: 'output',
          dataType: 'String',
          isNullable: true,
        )
      ])
    ], enums: <Enum>[]);
    final StringBuffer sink = StringBuffer();
    generateDart(const DartOptions(isNullSafe: false), root, sink);
    final String code = sink.toString();
    expect(code, contains('class Api'));
    expect(code, matches('Output.*doSomething.*Input'));
  });

  test('nested class', () {
    final Root root = Root(apis: <Api>[], classes: <Class>[
      Class(
        name: 'Input',
        fields: <Field>[
          Field(
            name: 'input',
            dataType: 'String',
            isNullable: true,
          )
        ],
      ),
      Class(
        name: 'Nested',
        fields: <Field>[
          Field(
            name: 'nested',
            dataType: 'Input',
            isNullable: true,
          )
        ],
      )
    ], enums: <Enum>[]);
    final StringBuffer sink = StringBuffer();
    generateDart(const DartOptions(isNullSafe: false), root, sink);
    final String code = sink.toString();
    expect(
      code,
      contains(
        'pigeonMap[\'nested\'] = nested == null ? null : nested.encode()',
      ),
    );
    expect(
      code.replaceAll('\n', ' ').replaceAll('  ', ''),
      contains(
        '..nested = pigeonMap[\'nested\'] != null ? Input.decode(pigeonMap[\'nested\']) : null;',
      ),
    );
  });

  test('flutterapi', () {
    final Root root = Root(apis: <Api>[
      Api(name: 'Api', location: ApiLocation.flutter, methods: <Method>[
        Method(
          name: 'doSomething',
          argType: 'Input',
          isArgNullable: false,
          returnType: 'Output',
          isAsynchronous: false,
        )
      ])
    ], classes: <Class>[
      Class(name: 'Input', fields: <Field>[
        Field(
          name: 'input',
          dataType: 'String',
          isNullable: true,
        )
      ]),
      Class(name: 'Output', fields: <Field>[
        Field(
          name: 'output',
          dataType: 'String',
          isNullable: true,
        )
      ])
    ], enums: <Enum>[]);
    final StringBuffer sink = StringBuffer();
    generateDart(const DartOptions(isNullSafe: false), root, sink);
    final String code = sink.toString();
    expect(code, contains('abstract class Api'));
    expect(code, contains('static void setup(Api'));
  });

  test('host void', () {
    final Root root = Root(apis: <Api>[
      Api(name: 'Api', location: ApiLocation.host, methods: <Method>[
        Method(
          name: 'doSomething',
          argType: 'Input',
          isArgNullable: false,
          returnType: 'void',
          isAsynchronous: false,
        )
      ])
    ], classes: <Class>[
      Class(name: 'Input', fields: <Field>[
        Field(
          name: 'input',
          dataType: 'String',
          isNullable: true,
        )
      ]),
    ], enums: <Enum>[]);
    final StringBuffer sink = StringBuffer();
    generateDart(const DartOptions(isNullSafe: false), root, sink);
    final String code = sink.toString();
    expect(code, contains('Future<void> doSomething'));
    expect(code, contains('// noop'));
  });

  test('flutter void return', () {
    final Root root = Root(apis: <Api>[
      Api(name: 'Api', location: ApiLocation.flutter, methods: <Method>[
        Method(
          name: 'doSomething',
          argType: 'Input',
          isArgNullable: false,
          returnType: 'void',
          isAsynchronous: false,
        )
      ])
    ], classes: <Class>[
      Class(name: 'Input', fields: <Field>[
        Field(
          name: 'input',
          dataType: 'String',
          isNullable: true,
        )
      ]),
    ], enums: <Enum>[]);
    final StringBuffer sink = StringBuffer();
    generateDart(const DartOptions(isNullSafe: false), root, sink);
    final String code = sink.toString();
    // The next line verifies that we're not setting a variable to the value of "doSomething", but
    // ignores the line where we assert the value of the argument isn't null, since on that line
    // we mention "doSomething" in the assertion message.
    expect(code, isNot(matches('[^!]=.*doSomething')));
    expect(code, contains('doSomething('));
  });

  test('flutter void argument', () {
    final Root root = Root(apis: <Api>[
      Api(name: 'Api', location: ApiLocation.flutter, methods: <Method>[
        Method(
          name: 'doSomething',
          argType: 'void',
          isArgNullable: false,
          returnType: 'Output',
          isAsynchronous: false,
        )
      ])
    ], classes: <Class>[
      Class(name: 'Output', fields: <Field>[
        Field(
          name: 'output',
          dataType: 'String',
          isNullable: true,
        )
      ]),
    ], enums: <Enum>[]);
    final StringBuffer sink = StringBuffer();
    generateDart(const DartOptions(isNullSafe: false), root, sink);
    final String code = sink.toString();
    expect(code, matches('output.*=.*doSomething[(][)]'));
    expect(code, contains('Output doSomething();'));
  });

  test('flutter enum argument with enum class', () {
    final Root root = Root(apis: <Api>[
      Api(name: 'Api', location: ApiLocation.flutter, methods: <Method>[
        Method(
          name: 'doSomething',
          argType: 'EnumClass',
          isArgNullable: false,
          returnType: 'EnumClass',
          isAsynchronous: false,
        )
      ])
    ], classes: <Class>[
      Class(name: 'EnumClass', fields: <Field>[
        Field(
          name: 'enum1',
          dataType: 'Enum',
          isNullable: true,
        )
      ]),
    ], enums: <Enum>[
      Enum(
        name: 'Enum',
        members: <String>[
          'one',
          'two',
        ],
      )
    ]);
    final StringBuffer sink = StringBuffer();
    generateDart(const DartOptions(isNullSafe: false), root, sink);
    final String code = sink.toString();
    expect(code,
        contains('pigeonMap[\'enum1\'] = enum1 == null ? null : enum1.index;'));
    expect(code, contains('? Enum.values[pigeonMap[\'enum1\'] as int]'));
    expect(code, contains('EnumClass doSomething(EnumClass arg);'));
  });

  test('flutter enum argument with enum class nullsafe', () {
    final Root root = Root(apis: <Api>[
      Api(name: 'Api', location: ApiLocation.flutter, methods: <Method>[
        Method(
          name: 'doSomething',
          argType: 'EnumClass',
          isArgNullable: false,
          returnType: 'EnumClass',
          isAsynchronous: false,
        )
      ])
    ], classes: <Class>[
      Class(name: 'EnumClass', fields: <Field>[
        Field(
          name: 'enum1',
          dataType: 'Enum',
          isNullable: true,
        )
      ]),
    ], enums: <Enum>[
      Enum(
        name: 'Enum',
        members: <String>[
          'one',
          'two',
        ],
      )
    ]);
    final StringBuffer sink = StringBuffer();
    generateDart(const DartOptions(isNullSafe: true), root, sink);
    final String code = sink.toString();
    expect(
        code,
        contains(
            'pigeonMap[\'enum1\'] = enum1 == null ? null : enum1!.index;'));
    expect(code, contains('? Enum.values[pigeonMap[\'enum1\']! as int]'));
    expect(code, contains('EnumClass doSomething(EnumClass arg);'));
  });

  test('host void argument', () {
    final Root root = Root(apis: <Api>[
      Api(name: 'Api', location: ApiLocation.host, methods: <Method>[
        Method(
          name: 'doSomething',
          argType: 'void',
          isArgNullable: false,
          returnType: 'Output',
          isAsynchronous: false,
        )
      ])
    ], classes: <Class>[
      Class(name: 'Output', fields: <Field>[
        Field(
          name: 'output',
          dataType: 'String',
          isNullable: true,
        )
      ]),
    ], enums: <Enum>[]);
    final StringBuffer sink = StringBuffer();
    generateDart(const DartOptions(isNullSafe: false), root, sink);
    final String code = sink.toString();
    expect(code, matches('channel.send[(]null[)]'));
  });

  test('mock dart handler', () {
    final Root root = Root(apis: <Api>[
      Api(
          name: 'Api',
          location: ApiLocation.host,
          dartHostTestHandler: 'ApiMock',
          methods: <Method>[
            Method(
              name: 'doSomething',
              argType: 'Input',
              isArgNullable: false,
              returnType: 'Output',
              isAsynchronous: false,
            ),
            Method(
              name: 'voidReturner',
              argType: 'Input',
              isArgNullable: false,
              returnType: 'void',
              isAsynchronous: false,
            )
          ])
    ], classes: <Class>[
      Class(name: 'Input', fields: <Field>[
        Field(
          name: 'input',
          dataType: 'String',
          isNullable: true,
        )
      ]),
      Class(name: 'Output', fields: <Field>[
        Field(
          name: 'output',
          dataType: 'String',
          isNullable: true,
        )
      ])
    ], enums: <Enum>[]);
    final StringBuffer mainCodeSink = StringBuffer();
    final StringBuffer testCodeSink = StringBuffer();
    generateDart(const DartOptions(isNullSafe: false), root, mainCodeSink);
    final String mainCode = mainCodeSink.toString();
    expect(mainCode, isNot(contains('import \'fo\\\'o.dart\';')));
    expect(mainCode, contains('class Api {'));
    expect(mainCode, isNot(contains('abstract class ApiMock')));
    expect(mainCode, isNot(contains('.ApiMock.doSomething')));
    expect(mainCode, isNot(contains('\'${Keys.result}\': output')));
    expect(mainCode, isNot(contains('return <Object, Object>{};')));
    generateTestDart(
        const DartOptions(isNullSafe: false), root, testCodeSink, "fo'o.dart");
    final String testCode = testCodeSink.toString();
    expect(testCode, contains('import \'fo\\\'o.dart\';'));
    expect(testCode, isNot(contains('class Api {')));
    expect(testCode, contains('abstract class ApiMock'));
    expect(testCode, isNot(contains('.ApiMock.doSomething')));
    expect(testCode, contains('\'${Keys.result}\': output'));
    expect(testCode, contains('return <Object, Object>{};'));
  });

  test('opt out of nndb', () {
    final Class klass = Class(
      name: 'Foobar',
      fields: <Field>[
        Field(
          name: 'field1',
          dataType: 'dataType1',
          isNullable: true,
        ),
      ],
    );
    final Root root = Root(
      apis: <Api>[],
      classes: <Class>[klass],
      enums: <Enum>[],
    );
    final StringBuffer sink = StringBuffer();
    generateDart(const DartOptions(isNullSafe: false), root, sink);
    final String code = sink.toString();
    expect(code, contains('// @dart = 2.8'));
  });

  test('gen one async Flutter Api', () {
    final Root root = Root(apis: <Api>[
      Api(name: 'Api', location: ApiLocation.flutter, methods: <Method>[
        Method(
          name: 'doSomething',
          argType: 'Input',
          isArgNullable: false,
          returnType: 'Output',
          isAsynchronous: true,
        )
      ])
    ], classes: <Class>[
      Class(name: 'Input', fields: <Field>[
        Field(
          name: 'input',
          dataType: 'String',
          isNullable: true,
        )
      ]),
      Class(name: 'Output', fields: <Field>[
        Field(
          name: 'output',
          dataType: 'String',
          isNullable: true,
        )
      ])
    ], enums: <Enum>[]);
    final StringBuffer sink = StringBuffer();
    generateDart(const DartOptions(isNullSafe: false), root, sink);
    final String code = sink.toString();
    expect(code, contains('abstract class Api'));
    expect(code, contains('Future<Output> doSomething(Input arg);'));
    expect(
        code, contains('final Output output = await api.doSomething(input);'));
  });

  test('gen one async Flutter Api with void return', () {
    final Root root = Root(apis: <Api>[
      Api(name: 'Api', location: ApiLocation.flutter, methods: <Method>[
        Method(
          name: 'doSomething',
          argType: 'Input',
          isArgNullable: false,
          returnType: 'void',
          isAsynchronous: true,
        )
      ])
    ], classes: <Class>[
      Class(name: 'Input', fields: <Field>[
        Field(
          name: 'input',
          dataType: 'String',
          isNullable: true,
        )
      ]),
      Class(name: 'Output', fields: <Field>[
        Field(
          name: 'output',
          dataType: 'String',
          isNullable: true,
        )
      ])
    ], enums: <Enum>[]);
    final StringBuffer sink = StringBuffer();
    generateDart(const DartOptions(isNullSafe: false), root, sink);
    final String code = sink.toString();
    expect(code, isNot(matches('=.s*doSomething')));
    expect(code, contains('await api.doSomething('));
    expect(code, isNot(contains('._toMap()')));
  });

  test('gen one async Host Api', () {
    final Root root = Root(apis: <Api>[
      Api(name: 'Api', location: ApiLocation.host, methods: <Method>[
        Method(
          name: 'doSomething',
          argType: 'Input',
          isArgNullable: false,
          returnType: 'Output',
          isAsynchronous: true,
        )
      ])
    ], classes: <Class>[
      Class(name: 'Input', fields: <Field>[
        Field(
          name: 'input',
          dataType: 'String',
          isNullable: true,
        )
      ]),
      Class(name: 'Output', fields: <Field>[
        Field(
          name: 'output',
          dataType: 'String',
          isNullable: true,
        )
      ])
    ], enums: <Enum>[]);
    final StringBuffer sink = StringBuffer();
    generateDart(const DartOptions(isNullSafe: false), root, sink);
    final String code = sink.toString();
    expect(code, contains('class Api'));
    expect(code, matches('Output.*doSomething.*Input'));
  });

  test('async host void argument', () {
    final Root root = Root(apis: <Api>[
      Api(name: 'Api', location: ApiLocation.host, methods: <Method>[
        Method(
          name: 'doSomething',
          argType: 'void',
          isArgNullable: false,
          returnType: 'Output',
          isAsynchronous: true,
        )
      ])
    ], classes: <Class>[
      Class(name: 'Output', fields: <Field>[
        Field(
          name: 'output',
          dataType: 'String',
          isNullable: true,
        )
      ]),
    ], enums: <Enum>[]);
    final StringBuffer sink = StringBuffer();
    generateDart(const DartOptions(isNullSafe: false), root, sink);
    final String code = sink.toString();
    expect(code, matches('channel.send[(]null[)]'));
  });

  Iterable<String> _makeIterable(String string) sync* {
    yield string;
  }

  test('header', () {
    final Root root = Root(apis: <Api>[], classes: <Class>[], enums: <Enum>[]);
    final StringBuffer sink = StringBuffer();
    generateDart(
      DartOptions(
          isNullSafe: false, copyrightHeader: _makeIterable('hello world')),
      root,
      sink,
    );
    final String code = sink.toString();
    expect(code, startsWith('// hello world'));
  });
}