// Copyright 2014 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:gen_defaults/template.dart';
import 'package:path/path.dart' as path;
import 'package:test/test.dart';

void main() {
  test('Templates will append to the end of a file', () {
    final Directory tempDir = Directory.systemTemp.createTempSync('gen_defaults');
    try {
      // Create a temporary file with some content.
      final File tempFile = File(path.join(tempDir.path, 'test_template.txt'));
      tempFile.createSync();
      tempFile.writeAsStringSync('''
// This is a file with stuff in it.
// This part shouldn't be changed by
// the template.
''');

      // Have a test template append new parameterized content to the end of
      // the file.
      final Map<String, dynamic> tokens = <String, dynamic>{'foo': 'Foobar', 'bar': 'Barfoo'};
      TestTemplate(tempFile.path, tokens).updateFile();

      expect(tempFile.readAsStringSync(), '''
// This is a file with stuff in it.
// This part shouldn't be changed by
// the template.

// BEGIN GENERATED TOKEN PROPERTIES

// Generated code to the end of this file. Do not edit by hand.
// These defaults are generated from the Material Design Token
// database by the script dev/tools/gen_defaults/bin/gen_defaults.dart.

static final String tokenFoo = 'Foobar';
static final String tokenBar = 'Barfoo';

// END GENERATED TOKEN PROPERTIES
''');

    } finally {
      tempDir.deleteSync(recursive: true);
    }
  });

  test('Templates will update over previously generated code at the end of a file', () {
    final Directory tempDir = Directory.systemTemp.createTempSync('gen_defaults');
    try {
      // Create a temporary file with some content.
      final File tempFile = File(path.join(tempDir.path, 'test_template.txt'));
      tempFile.createSync();
      tempFile.writeAsStringSync('''
// This is a file with stuff in it.
// This part shouldn't be changed by
// the template.

// BEGIN GENERATED TOKEN PROPERTIES

// Generated code to the end of this file. Do not edit by hand.
// These defaults are generated from the Material Design Token
// database by the script dev/tools/gen_defaults/bin/gen_defaults.dart.

static final String tokenFoo = 'Foobar';
static final String tokenBar = 'Barfoo';

// END GENERATED TOKEN PROPERTIES
''');

      // Have a test template append new parameterized content to the end of
      // the file.
      final Map<String, dynamic> tokens = <String, dynamic>{'foo': 'foo', 'bar': 'bar'};
      TestTemplate(tempFile.path, tokens).updateFile();

      expect(tempFile.readAsStringSync(), '''
// This is a file with stuff in it.
// This part shouldn't be changed by
// the template.

// BEGIN GENERATED TOKEN PROPERTIES

// Generated code to the end of this file. Do not edit by hand.
// These defaults are generated from the Material Design Token
// database by the script dev/tools/gen_defaults/bin/gen_defaults.dart.

static final String tokenFoo = 'foo';
static final String tokenBar = 'bar';

// END GENERATED TOKEN PROPERTIES
''');

    } finally {
      tempDir.deleteSync(recursive: true);
    }
  });
}

class TestTemplate extends TokenTemplate {
  TestTemplate(String fileName, Map<String, dynamic> tokens) : super(fileName, tokens);

  @override
  String generate() => '''
static final String tokenFoo = '${tokens['foo']}';
static final String tokenBar = '${tokens['bar']}';
''';
}