import 'dart:convert';

import 'package:fires_flutter/file_utils.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';

/// Bundle de mentira: solo "existen" los assets que se le pasan. Evita depender
/// del bundle real, que en un test unitario no responde.
class _FakeBundle extends CachingAssetBundle {
  _FakeBundle(this.present);

  final Set<String> present;

  @override
  Future<ByteData> load(String key) async {
    if (!present.contains(key)) {
      throw FlutterError('Unable to load asset: $key');
    }
    return ByteData.sublistView(Uint8List.fromList(utf8.encode('x')));
  }
}

void main() {
  test('test es-ES fallback', () {
    final String answer = getFallbackLang('es-ES');
    expect(answer, 'es');
  });

  test('test en-GB fallback', () {
    final String answer = getFallbackLang('en-GB');
    expect(answer, 'en');
  });

  test('test gl fallback', () {
    final String answer = getFallbackLang('gl');
    expect(answer, 'es');
  });

  test('test fr fallback', () {
    final String answer = getFallbackLang('fr');
    expect(answer, 'en');
  });

  test('test privacy English md page', () async {
    final String answer = await getFileNameOfLang(
        dir: 'assets/pages',
        fileName: 'privacy',
        ext: 'md',
        lang: 'en',
        bundle: _FakeBundle(<String>{'assets/pages/privacy-en.md'}));
    expect(answer, 'assets/pages/privacy-en.md');
  });

  test('idioma sin fichero propio cae al del idioma de respaldo', () async {
    final String answer = await getFileNameOfLang(
        dir: 'assets/pages',
        fileName: 'privacy',
        ext: 'md',
        lang: 'gl',
        bundle: _FakeBundle(<String>{'assets/pages/privacy-es.md'}));
    expect(answer, 'assets/pages/privacy-es.md');
  });

  test('sin traducciones cae al fichero base', () async {
    final String answer = await getFileNameOfLang(
        dir: 'assets/pages',
        fileName: 'privacy',
        ext: 'md',
        lang: 'fr',
        bundle: _FakeBundle(<String>{}));
    expect(answer, 'assets/pages/privacy.md');
  });
}